Bug Summary

File:llvm/lib/Support/APInt.cpp
Warning:line 198, column 5
Use of memory after it is freed

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name APInt.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/lib/Support -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/lib/Support -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-01-13-084841-49055-1 -x c++ /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp

/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp

1//===-- APInt.cpp - Implement APInt class ---------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements a class to represent arbitrary precision integer
10// constant values and provide a variety of arithmetic operations on them.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/ADT/APInt.h"
15#include "llvm/ADT/ArrayRef.h"
16#include "llvm/ADT/FoldingSet.h"
17#include "llvm/ADT/Hashing.h"
18#include "llvm/ADT/Optional.h"
19#include "llvm/ADT/SmallString.h"
20#include "llvm/ADT/StringRef.h"
21#include "llvm/ADT/bit.h"
22#include "llvm/Config/llvm-config.h"
23#include "llvm/Support/Debug.h"
24#include "llvm/Support/ErrorHandling.h"
25#include "llvm/Support/MathExtras.h"
26#include "llvm/Support/raw_ostream.h"
27#include <climits>
28#include <cmath>
29#include <cstdlib>
30#include <cstring>
31using namespace llvm;
32
33#define DEBUG_TYPE"apint" "apint"
34
35/// A utility function for allocating memory, checking for allocation failures,
36/// and ensuring the contents are zeroed.
37inline static uint64_t* getClearedMemory(unsigned numWords) {
38 uint64_t *result = new uint64_t[numWords];
29
Memory is allocated
39 memset(result, 0, numWords * sizeof(uint64_t));
40 return result;
41}
42
43/// A utility function for allocating memory and checking for allocation
44/// failure. The content is not zeroed.
45inline static uint64_t* getMemory(unsigned numWords) {
46 return new uint64_t[numWords];
47}
48
49/// A utility function that converts a character to a digit.
50inline static unsigned getDigit(char cdigit, uint8_t radix) {
51 unsigned r;
52
53 if (radix == 16 || radix == 36) {
54 r = cdigit - '0';
55 if (r <= 9)
56 return r;
57
58 r = cdigit - 'A';
59 if (r <= radix - 11U)
60 return r + 10;
61
62 r = cdigit - 'a';
63 if (r <= radix - 11U)
64 return r + 10;
65
66 radix = 10;
67 }
68
69 r = cdigit - '0';
70 if (r < radix)
71 return r;
72
73 return -1U;
74}
75
76
77void APInt::initSlowCase(uint64_t val, bool isSigned) {
78 U.pVal = getClearedMemory(getNumWords());
28
Calling 'getClearedMemory'
30
Returned allocated memory
79 U.pVal[0] = val;
80 if (isSigned
30.1
'isSigned' is false
30.1
'isSigned' is false
&& int64_t(val) < 0)
81 for (unsigned i = 1; i < getNumWords(); ++i)
82 U.pVal[i] = WORDTYPE_MAX;
83 clearUnusedBits();
84}
85
86void APInt::initSlowCase(const APInt& that) {
87 U.pVal = getMemory(getNumWords());
88 memcpy(U.pVal, that.U.pVal, getNumWords() * APINT_WORD_SIZE);
89}
90
91void APInt::initFromArray(ArrayRef<uint64_t> bigVal) {
92 assert(BitWidth && "Bitwidth too small")((BitWidth && "Bitwidth too small") ? static_cast<
void> (0) : __assert_fail ("BitWidth && \"Bitwidth too small\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 92, __PRETTY_FUNCTION__))
;
93 assert(bigVal.data() && "Null pointer detected!")((bigVal.data() && "Null pointer detected!") ? static_cast
<void> (0) : __assert_fail ("bigVal.data() && \"Null pointer detected!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 93, __PRETTY_FUNCTION__))
;
94 if (isSingleWord())
95 U.VAL = bigVal[0];
96 else {
97 // Get memory, cleared to 0
98 U.pVal = getClearedMemory(getNumWords());
99 // Calculate the number of words to copy
100 unsigned words = std::min<unsigned>(bigVal.size(), getNumWords());
101 // Copy the words from bigVal to pVal
102 memcpy(U.pVal, bigVal.data(), words * APINT_WORD_SIZE);
103 }
104 // Make sure unused high bits are cleared
105 clearUnusedBits();
106}
107
108APInt::APInt(unsigned numBits, ArrayRef<uint64_t> bigVal)
109 : BitWidth(numBits) {
110 initFromArray(bigVal);
111}
112
113APInt::APInt(unsigned numBits, unsigned numWords, const uint64_t bigVal[])
114 : BitWidth(numBits) {
115 initFromArray(makeArrayRef(bigVal, numWords));
116}
117
118APInt::APInt(unsigned numbits, StringRef Str, uint8_t radix)
119 : BitWidth(numbits) {
120 assert(BitWidth && "Bitwidth too small")((BitWidth && "Bitwidth too small") ? static_cast<
void> (0) : __assert_fail ("BitWidth && \"Bitwidth too small\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 120, __PRETTY_FUNCTION__))
;
121 fromString(numbits, Str, radix);
122}
123
124void APInt::reallocate(unsigned NewBitWidth) {
125 // If the number of words is the same we can just change the width and stop.
126 if (getNumWords() == getNumWords(NewBitWidth)) {
127 BitWidth = NewBitWidth;
128 return;
129 }
130
131 // If we have an allocation, delete it.
132 if (!isSingleWord())
133 delete [] U.pVal;
134
135 // Update BitWidth.
136 BitWidth = NewBitWidth;
137
138 // If we are supposed to have an allocation, create it.
139 if (!isSingleWord())
140 U.pVal = getMemory(getNumWords());
141}
142
143void APInt::AssignSlowCase(const APInt& RHS) {
144 // Don't do anything for X = X
145 if (this == &RHS)
146 return;
147
148 // Adjust the bit width and handle allocations as necessary.
149 reallocate(RHS.getBitWidth());
150
151 // Copy the data.
152 if (isSingleWord())
153 U.VAL = RHS.U.VAL;
154 else
155 memcpy(U.pVal, RHS.U.pVal, getNumWords() * APINT_WORD_SIZE);
156}
157
158/// This method 'profiles' an APInt for use with FoldingSet.
159void APInt::Profile(FoldingSetNodeID& ID) const {
160 ID.AddInteger(BitWidth);
161
162 if (isSingleWord()) {
163 ID.AddInteger(U.VAL);
164 return;
165 }
166
167 unsigned NumWords = getNumWords();
168 for (unsigned i = 0; i < NumWords; ++i)
169 ID.AddInteger(U.pVal[i]);
170}
171
172/// Prefix increment operator. Increments the APInt by one.
173APInt& APInt::operator++() {
174 if (isSingleWord())
175 ++U.VAL;
176 else
177 tcIncrement(U.pVal, getNumWords());
178 return clearUnusedBits();
179}
180
181/// Prefix decrement operator. Decrements the APInt by one.
182APInt& APInt::operator--() {
183 if (isSingleWord())
184 --U.VAL;
185 else
186 tcDecrement(U.pVal, getNumWords());
187 return clearUnusedBits();
188}
189
190/// Adds the RHS APInt to this APInt.
191/// @returns this, after addition of RHS.
192/// Addition assignment operator.
193APInt& APInt::operator+=(const APInt& RHS) {
194 assert
43.1
'BitWidth' is equal to 'RHS.BitWidth'
43.1
'BitWidth' is equal to 'RHS.BitWidth'
(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 194, __PRETTY_FUNCTION__))
;
44
'?' condition is true
195 if (isSingleWord())
45
Taking false branch
196 U.VAL += RHS.U.VAL;
197 else
198 tcAdd(U.pVal, RHS.U.pVal, 0, getNumWords());
46
Use of memory after it is freed
199 return clearUnusedBits();
200}
201
202APInt& APInt::operator+=(uint64_t RHS) {
203 if (isSingleWord())
204 U.VAL += RHS;
205 else
206 tcAddPart(U.pVal, RHS, getNumWords());
207 return clearUnusedBits();
208}
209
210/// Subtracts the RHS APInt from this APInt
211/// @returns this, after subtraction
212/// Subtraction assignment operator.
213APInt& APInt::operator-=(const APInt& RHS) {
214 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 214, __PRETTY_FUNCTION__))
;
215 if (isSingleWord())
216 U.VAL -= RHS.U.VAL;
217 else
218 tcSubtract(U.pVal, RHS.U.pVal, 0, getNumWords());
219 return clearUnusedBits();
220}
221
222APInt& APInt::operator-=(uint64_t RHS) {
223 if (isSingleWord())
224 U.VAL -= RHS;
225 else
226 tcSubtractPart(U.pVal, RHS, getNumWords());
227 return clearUnusedBits();
228}
229
230APInt APInt::operator*(const APInt& RHS) const {
231 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 231, __PRETTY_FUNCTION__))
;
232 if (isSingleWord())
233 return APInt(BitWidth, U.VAL * RHS.U.VAL);
234
235 APInt Result(getMemory(getNumWords()), getBitWidth());
236
237 tcMultiply(Result.U.pVal, U.pVal, RHS.U.pVal, getNumWords());
238
239 Result.clearUnusedBits();
240 return Result;
241}
242
243void APInt::AndAssignSlowCase(const APInt& RHS) {
244 tcAnd(U.pVal, RHS.U.pVal, getNumWords());
245}
246
247void APInt::OrAssignSlowCase(const APInt& RHS) {
248 tcOr(U.pVal, RHS.U.pVal, getNumWords());
249}
250
251void APInt::XorAssignSlowCase(const APInt& RHS) {
252 tcXor(U.pVal, RHS.U.pVal, getNumWords());
253}
254
255APInt& APInt::operator*=(const APInt& RHS) {
256 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 256, __PRETTY_FUNCTION__))
;
257 *this = *this * RHS;
258 return *this;
259}
260
261APInt& APInt::operator*=(uint64_t RHS) {
262 if (isSingleWord()) {
263 U.VAL *= RHS;
264 } else {
265 unsigned NumWords = getNumWords();
266 tcMultiplyPart(U.pVal, U.pVal, RHS, 0, NumWords, NumWords, false);
267 }
268 return clearUnusedBits();
269}
270
271bool APInt::EqualSlowCase(const APInt& RHS) const {
272 return std::equal(U.pVal, U.pVal + getNumWords(), RHS.U.pVal);
273}
274
275int APInt::compare(const APInt& RHS) const {
276 assert(BitWidth == RHS.BitWidth && "Bit widths must be same for comparison")((BitWidth == RHS.BitWidth && "Bit widths must be same for comparison"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be same for comparison\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 276, __PRETTY_FUNCTION__))
;
277 if (isSingleWord())
278 return U.VAL < RHS.U.VAL ? -1 : U.VAL > RHS.U.VAL;
279
280 return tcCompare(U.pVal, RHS.U.pVal, getNumWords());
281}
282
283int APInt::compareSigned(const APInt& RHS) const {
284 assert(BitWidth == RHS.BitWidth && "Bit widths must be same for comparison")((BitWidth == RHS.BitWidth && "Bit widths must be same for comparison"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be same for comparison\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 284, __PRETTY_FUNCTION__))
;
285 if (isSingleWord()) {
286 int64_t lhsSext = SignExtend64(U.VAL, BitWidth);
287 int64_t rhsSext = SignExtend64(RHS.U.VAL, BitWidth);
288 return lhsSext < rhsSext ? -1 : lhsSext > rhsSext;
289 }
290
291 bool lhsNeg = isNegative();
292 bool rhsNeg = RHS.isNegative();
293
294 // If the sign bits don't match, then (LHS < RHS) if LHS is negative
295 if (lhsNeg != rhsNeg)
296 return lhsNeg ? -1 : 1;
297
298 // Otherwise we can just use an unsigned comparison, because even negative
299 // numbers compare correctly this way if both have the same signed-ness.
300 return tcCompare(U.pVal, RHS.U.pVal, getNumWords());
301}
302
303void APInt::setBitsSlowCase(unsigned loBit, unsigned hiBit) {
304 unsigned loWord = whichWord(loBit);
305 unsigned hiWord = whichWord(hiBit);
306
307 // Create an initial mask for the low word with zeros below loBit.
308 uint64_t loMask = WORDTYPE_MAX << whichBit(loBit);
309
310 // If hiBit is not aligned, we need a high mask.
311 unsigned hiShiftAmt = whichBit(hiBit);
312 if (hiShiftAmt != 0) {
313 // Create a high mask with zeros above hiBit.
314 uint64_t hiMask = WORDTYPE_MAX >> (APINT_BITS_PER_WORD - hiShiftAmt);
315 // If loWord and hiWord are equal, then we combine the masks. Otherwise,
316 // set the bits in hiWord.
317 if (hiWord == loWord)
318 loMask &= hiMask;
319 else
320 U.pVal[hiWord] |= hiMask;
321 }
322 // Apply the mask to the low word.
323 U.pVal[loWord] |= loMask;
324
325 // Fill any words between loWord and hiWord with all ones.
326 for (unsigned word = loWord + 1; word < hiWord; ++word)
327 U.pVal[word] = WORDTYPE_MAX;
328}
329
330/// Toggle every bit to its opposite value.
331void APInt::flipAllBitsSlowCase() {
332 tcComplement(U.pVal, getNumWords());
333 clearUnusedBits();
334}
335
336/// Toggle a given bit to its opposite value whose position is given
337/// as "bitPosition".
338/// Toggles a given bit to its opposite value.
339void APInt::flipBit(unsigned bitPosition) {
340 assert(bitPosition < BitWidth && "Out of the bit-width range!")((bitPosition < BitWidth && "Out of the bit-width range!"
) ? static_cast<void> (0) : __assert_fail ("bitPosition < BitWidth && \"Out of the bit-width range!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 340, __PRETTY_FUNCTION__))
;
341 if ((*this)[bitPosition]) clearBit(bitPosition);
342 else setBit(bitPosition);
343}
344
345void APInt::insertBits(const APInt &subBits, unsigned bitPosition) {
346 unsigned subBitWidth = subBits.getBitWidth();
347 assert(0 < subBitWidth && (subBitWidth + bitPosition) <= BitWidth &&((0 < subBitWidth && (subBitWidth + bitPosition) <=
BitWidth && "Illegal bit insertion") ? static_cast<
void> (0) : __assert_fail ("0 < subBitWidth && (subBitWidth + bitPosition) <= BitWidth && \"Illegal bit insertion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 348, __PRETTY_FUNCTION__))
348 "Illegal bit insertion")((0 < subBitWidth && (subBitWidth + bitPosition) <=
BitWidth && "Illegal bit insertion") ? static_cast<
void> (0) : __assert_fail ("0 < subBitWidth && (subBitWidth + bitPosition) <= BitWidth && \"Illegal bit insertion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 348, __PRETTY_FUNCTION__))
;
349
350 // Insertion is a direct copy.
351 if (subBitWidth == BitWidth) {
352 *this = subBits;
353 return;
354 }
355
356 // Single word result can be done as a direct bitmask.
357 if (isSingleWord()) {
358 uint64_t mask = WORDTYPE_MAX >> (APINT_BITS_PER_WORD - subBitWidth);
359 U.VAL &= ~(mask << bitPosition);
360 U.VAL |= (subBits.U.VAL << bitPosition);
361 return;
362 }
363
364 unsigned loBit = whichBit(bitPosition);
365 unsigned loWord = whichWord(bitPosition);
366 unsigned hi1Word = whichWord(bitPosition + subBitWidth - 1);
367
368 // Insertion within a single word can be done as a direct bitmask.
369 if (loWord == hi1Word) {
370 uint64_t mask = WORDTYPE_MAX >> (APINT_BITS_PER_WORD - subBitWidth);
371 U.pVal[loWord] &= ~(mask << loBit);
372 U.pVal[loWord] |= (subBits.U.VAL << loBit);
373 return;
374 }
375
376 // Insert on word boundaries.
377 if (loBit == 0) {
378 // Direct copy whole words.
379 unsigned numWholeSubWords = subBitWidth / APINT_BITS_PER_WORD;
380 memcpy(U.pVal + loWord, subBits.getRawData(),
381 numWholeSubWords * APINT_WORD_SIZE);
382
383 // Mask+insert remaining bits.
384 unsigned remainingBits = subBitWidth % APINT_BITS_PER_WORD;
385 if (remainingBits != 0) {
386 uint64_t mask = WORDTYPE_MAX >> (APINT_BITS_PER_WORD - remainingBits);
387 U.pVal[hi1Word] &= ~mask;
388 U.pVal[hi1Word] |= subBits.getWord(subBitWidth - 1);
389 }
390 return;
391 }
392
393 // General case - set/clear individual bits in dst based on src.
394 // TODO - there is scope for optimization here, but at the moment this code
395 // path is barely used so prefer readability over performance.
396 for (unsigned i = 0; i != subBitWidth; ++i) {
397 if (subBits[i])
398 setBit(bitPosition + i);
399 else
400 clearBit(bitPosition + i);
401 }
402}
403
404void APInt::insertBits(uint64_t subBits, unsigned bitPosition, unsigned numBits) {
405 uint64_t maskBits = maskTrailingOnes<uint64_t>(numBits);
406 subBits &= maskBits;
407 if (isSingleWord()) {
408 U.VAL &= ~(maskBits << bitPosition);
409 U.VAL |= subBits << bitPosition;
410 return;
411 }
412
413 unsigned loBit = whichBit(bitPosition);
414 unsigned loWord = whichWord(bitPosition);
415 unsigned hiWord = whichWord(bitPosition + numBits - 1);
416 if (loWord == hiWord) {
417 U.pVal[loWord] &= ~(maskBits << loBit);
418 U.pVal[loWord] |= subBits << loBit;
419 return;
420 }
421
422 static_assert(8 * sizeof(WordType) <= 64, "This code assumes only two words affected");
423 unsigned wordBits = 8 * sizeof(WordType);
424 U.pVal[loWord] &= ~(maskBits << loBit);
425 U.pVal[loWord] |= subBits << loBit;
426
427 U.pVal[hiWord] &= ~(maskBits >> (wordBits - loBit));
428 U.pVal[hiWord] |= subBits >> (wordBits - loBit);
429}
430
431APInt APInt::extractBits(unsigned numBits, unsigned bitPosition) const {
432 assert(numBits > 0 && "Can't extract zero bits")((numBits > 0 && "Can't extract zero bits") ? static_cast
<void> (0) : __assert_fail ("numBits > 0 && \"Can't extract zero bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 432, __PRETTY_FUNCTION__))
;
433 assert(bitPosition < BitWidth && (numBits + bitPosition) <= BitWidth &&((bitPosition < BitWidth && (numBits + bitPosition
) <= BitWidth && "Illegal bit extraction") ? static_cast
<void> (0) : __assert_fail ("bitPosition < BitWidth && (numBits + bitPosition) <= BitWidth && \"Illegal bit extraction\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 434, __PRETTY_FUNCTION__))
434 "Illegal bit extraction")((bitPosition < BitWidth && (numBits + bitPosition
) <= BitWidth && "Illegal bit extraction") ? static_cast
<void> (0) : __assert_fail ("bitPosition < BitWidth && (numBits + bitPosition) <= BitWidth && \"Illegal bit extraction\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 434, __PRETTY_FUNCTION__))
;
435
436 if (isSingleWord())
437 return APInt(numBits, U.VAL >> bitPosition);
438
439 unsigned loBit = whichBit(bitPosition);
440 unsigned loWord = whichWord(bitPosition);
441 unsigned hiWord = whichWord(bitPosition + numBits - 1);
442
443 // Single word result extracting bits from a single word source.
444 if (loWord == hiWord)
445 return APInt(numBits, U.pVal[loWord] >> loBit);
446
447 // Extracting bits that start on a source word boundary can be done
448 // as a fast memory copy.
449 if (loBit == 0)
450 return APInt(numBits, makeArrayRef(U.pVal + loWord, 1 + hiWord - loWord));
451
452 // General case - shift + copy source words directly into place.
453 APInt Result(numBits, 0);
454 unsigned NumSrcWords = getNumWords();
455 unsigned NumDstWords = Result.getNumWords();
456
457 uint64_t *DestPtr = Result.isSingleWord() ? &Result.U.VAL : Result.U.pVal;
458 for (unsigned word = 0; word < NumDstWords; ++word) {
459 uint64_t w0 = U.pVal[loWord + word];
460 uint64_t w1 =
461 (loWord + word + 1) < NumSrcWords ? U.pVal[loWord + word + 1] : 0;
462 DestPtr[word] = (w0 >> loBit) | (w1 << (APINT_BITS_PER_WORD - loBit));
463 }
464
465 return Result.clearUnusedBits();
466}
467
468uint64_t APInt::extractBitsAsZExtValue(unsigned numBits,
469 unsigned bitPosition) const {
470 assert(numBits > 0 && "Can't extract zero bits")((numBits > 0 && "Can't extract zero bits") ? static_cast
<void> (0) : __assert_fail ("numBits > 0 && \"Can't extract zero bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 470, __PRETTY_FUNCTION__))
;
471 assert(bitPosition < BitWidth && (numBits + bitPosition) <= BitWidth &&((bitPosition < BitWidth && (numBits + bitPosition
) <= BitWidth && "Illegal bit extraction") ? static_cast
<void> (0) : __assert_fail ("bitPosition < BitWidth && (numBits + bitPosition) <= BitWidth && \"Illegal bit extraction\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 472, __PRETTY_FUNCTION__))
472 "Illegal bit extraction")((bitPosition < BitWidth && (numBits + bitPosition
) <= BitWidth && "Illegal bit extraction") ? static_cast
<void> (0) : __assert_fail ("bitPosition < BitWidth && (numBits + bitPosition) <= BitWidth && \"Illegal bit extraction\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 472, __PRETTY_FUNCTION__))
;
473 assert(numBits <= 64 && "Illegal bit extraction")((numBits <= 64 && "Illegal bit extraction") ? static_cast
<void> (0) : __assert_fail ("numBits <= 64 && \"Illegal bit extraction\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 473, __PRETTY_FUNCTION__))
;
474
475 uint64_t maskBits = maskTrailingOnes<uint64_t>(numBits);
476 if (isSingleWord())
477 return (U.VAL >> bitPosition) & maskBits;
478
479 unsigned loBit = whichBit(bitPosition);
480 unsigned loWord = whichWord(bitPosition);
481 unsigned hiWord = whichWord(bitPosition + numBits - 1);
482 if (loWord == hiWord)
483 return (U.pVal[loWord] >> loBit) & maskBits;
484
485 static_assert(8 * sizeof(WordType) <= 64, "This code assumes only two words affected");
486 unsigned wordBits = 8 * sizeof(WordType);
487 uint64_t retBits = U.pVal[loWord] >> loBit;
488 retBits |= U.pVal[hiWord] << (wordBits - loBit);
489 retBits &= maskBits;
490 return retBits;
491}
492
493unsigned APInt::getBitsNeeded(StringRef str, uint8_t radix) {
494 assert(!str.empty() && "Invalid string length")((!str.empty() && "Invalid string length") ? static_cast
<void> (0) : __assert_fail ("!str.empty() && \"Invalid string length\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 494, __PRETTY_FUNCTION__))
;
495 assert((radix == 10 || radix == 8 || radix == 16 || radix == 2 ||(((radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix
== 36) && "Radix should be 2, 8, 10, 16, or 36!") ? static_cast
<void> (0) : __assert_fail ("(radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix == 36) && \"Radix should be 2, 8, 10, 16, or 36!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 497, __PRETTY_FUNCTION__))
496 radix == 36) &&(((radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix
== 36) && "Radix should be 2, 8, 10, 16, or 36!") ? static_cast
<void> (0) : __assert_fail ("(radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix == 36) && \"Radix should be 2, 8, 10, 16, or 36!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 497, __PRETTY_FUNCTION__))
497 "Radix should be 2, 8, 10, 16, or 36!")(((radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix
== 36) && "Radix should be 2, 8, 10, 16, or 36!") ? static_cast
<void> (0) : __assert_fail ("(radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix == 36) && \"Radix should be 2, 8, 10, 16, or 36!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 497, __PRETTY_FUNCTION__))
;
498
499 size_t slen = str.size();
500
501 // Each computation below needs to know if it's negative.
502 StringRef::iterator p = str.begin();
503 unsigned isNegative = *p == '-';
504 if (*p == '-' || *p == '+') {
505 p++;
506 slen--;
507 assert(slen && "String is only a sign, needs a value.")((slen && "String is only a sign, needs a value.") ? static_cast
<void> (0) : __assert_fail ("slen && \"String is only a sign, needs a value.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 507, __PRETTY_FUNCTION__))
;
508 }
509
510 // For radixes of power-of-two values, the bits required is accurately and
511 // easily computed
512 if (radix == 2)
513 return slen + isNegative;
514 if (radix == 8)
515 return slen * 3 + isNegative;
516 if (radix == 16)
517 return slen * 4 + isNegative;
518
519 // FIXME: base 36
520
521 // This is grossly inefficient but accurate. We could probably do something
522 // with a computation of roughly slen*64/20 and then adjust by the value of
523 // the first few digits. But, I'm not sure how accurate that could be.
524
525 // Compute a sufficient number of bits that is always large enough but might
526 // be too large. This avoids the assertion in the constructor. This
527 // calculation doesn't work appropriately for the numbers 0-9, so just use 4
528 // bits in that case.
529 unsigned sufficient
530 = radix == 10? (slen == 1 ? 4 : slen * 64/18)
531 : (slen == 1 ? 7 : slen * 16/3);
532
533 // Convert to the actual binary value.
534 APInt tmp(sufficient, StringRef(p, slen), radix);
535
536 // Compute how many bits are required. If the log is infinite, assume we need
537 // just bit. If the log is exact and value is negative, then the value is
538 // MinSignedValue with (log + 1) bits.
539 unsigned log = tmp.logBase2();
540 if (log == (unsigned)-1) {
541 return isNegative + 1;
542 } else if (isNegative && tmp.isPowerOf2()) {
543 return isNegative + log;
544 } else {
545 return isNegative + log + 1;
546 }
547}
548
549hash_code llvm::hash_value(const APInt &Arg) {
550 if (Arg.isSingleWord())
551 return hash_combine(Arg.U.VAL);
552
553 return hash_combine_range(Arg.U.pVal, Arg.U.pVal + Arg.getNumWords());
554}
555
556bool APInt::isSplat(unsigned SplatSizeInBits) const {
557 assert(getBitWidth() % SplatSizeInBits == 0 &&((getBitWidth() % SplatSizeInBits == 0 && "SplatSizeInBits must divide width!"
) ? static_cast<void> (0) : __assert_fail ("getBitWidth() % SplatSizeInBits == 0 && \"SplatSizeInBits must divide width!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 558, __PRETTY_FUNCTION__))
558 "SplatSizeInBits must divide width!")((getBitWidth() % SplatSizeInBits == 0 && "SplatSizeInBits must divide width!"
) ? static_cast<void> (0) : __assert_fail ("getBitWidth() % SplatSizeInBits == 0 && \"SplatSizeInBits must divide width!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 558, __PRETTY_FUNCTION__))
;
559 // We can check that all parts of an integer are equal by making use of a
560 // little trick: rotate and check if it's still the same value.
561 return *this == rotl(SplatSizeInBits);
562}
563
564/// This function returns the high "numBits" bits of this APInt.
565APInt APInt::getHiBits(unsigned numBits) const {
566 return this->lshr(BitWidth - numBits);
567}
568
569/// This function returns the low "numBits" bits of this APInt.
570APInt APInt::getLoBits(unsigned numBits) const {
571 APInt Result(getLowBitsSet(BitWidth, numBits));
572 Result &= *this;
573 return Result;
574}
575
576/// Return a value containing V broadcasted over NewLen bits.
577APInt APInt::getSplat(unsigned NewLen, const APInt &V) {
578 assert(NewLen >= V.getBitWidth() && "Can't splat to smaller bit width!")((NewLen >= V.getBitWidth() && "Can't splat to smaller bit width!"
) ? static_cast<void> (0) : __assert_fail ("NewLen >= V.getBitWidth() && \"Can't splat to smaller bit width!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 578, __PRETTY_FUNCTION__))
;
579
580 APInt Val = V.zextOrSelf(NewLen);
581 for (unsigned I = V.getBitWidth(); I < NewLen; I <<= 1)
582 Val |= Val << I;
583
584 return Val;
585}
586
587unsigned APInt::countLeadingZerosSlowCase() const {
588 unsigned Count = 0;
589 for (int i = getNumWords()-1; i >= 0; --i) {
590 uint64_t V = U.pVal[i];
591 if (V == 0)
592 Count += APINT_BITS_PER_WORD;
593 else {
594 Count += llvm::countLeadingZeros(V);
595 break;
596 }
597 }
598 // Adjust for unused bits in the most significant word (they are zero).
599 unsigned Mod = BitWidth % APINT_BITS_PER_WORD;
600 Count -= Mod > 0 ? APINT_BITS_PER_WORD - Mod : 0;
601 return Count;
602}
603
604unsigned APInt::countLeadingOnesSlowCase() const {
605 unsigned highWordBits = BitWidth % APINT_BITS_PER_WORD;
606 unsigned shift;
607 if (!highWordBits) {
608 highWordBits = APINT_BITS_PER_WORD;
609 shift = 0;
610 } else {
611 shift = APINT_BITS_PER_WORD - highWordBits;
612 }
613 int i = getNumWords() - 1;
614 unsigned Count = llvm::countLeadingOnes(U.pVal[i] << shift);
615 if (Count == highWordBits) {
616 for (i--; i >= 0; --i) {
617 if (U.pVal[i] == WORDTYPE_MAX)
618 Count += APINT_BITS_PER_WORD;
619 else {
620 Count += llvm::countLeadingOnes(U.pVal[i]);
621 break;
622 }
623 }
624 }
625 return Count;
626}
627
628unsigned APInt::countTrailingZerosSlowCase() const {
629 unsigned Count = 0;
630 unsigned i = 0;
631 for (; i < getNumWords() && U.pVal[i] == 0; ++i)
632 Count += APINT_BITS_PER_WORD;
633 if (i < getNumWords())
634 Count += llvm::countTrailingZeros(U.pVal[i]);
635 return std::min(Count, BitWidth);
636}
637
638unsigned APInt::countTrailingOnesSlowCase() const {
639 unsigned Count = 0;
640 unsigned i = 0;
641 for (; i < getNumWords() && U.pVal[i] == WORDTYPE_MAX; ++i)
642 Count += APINT_BITS_PER_WORD;
643 if (i < getNumWords())
644 Count += llvm::countTrailingOnes(U.pVal[i]);
645 assert(Count <= BitWidth)((Count <= BitWidth) ? static_cast<void> (0) : __assert_fail
("Count <= BitWidth", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 645, __PRETTY_FUNCTION__))
;
646 return Count;
647}
648
649unsigned APInt::countPopulationSlowCase() const {
650 unsigned Count = 0;
651 for (unsigned i = 0; i < getNumWords(); ++i)
652 Count += llvm::countPopulation(U.pVal[i]);
653 return Count;
654}
655
656bool APInt::intersectsSlowCase(const APInt &RHS) const {
657 for (unsigned i = 0, e = getNumWords(); i != e; ++i)
658 if ((U.pVal[i] & RHS.U.pVal[i]) != 0)
659 return true;
660
661 return false;
662}
663
664bool APInt::isSubsetOfSlowCase(const APInt &RHS) const {
665 for (unsigned i = 0, e = getNumWords(); i != e; ++i)
666 if ((U.pVal[i] & ~RHS.U.pVal[i]) != 0)
667 return false;
668
669 return true;
670}
671
672APInt APInt::byteSwap() const {
673 assert(BitWidth >= 16 && BitWidth % 16 == 0 && "Cannot byteswap!")((BitWidth >= 16 && BitWidth % 16 == 0 && "Cannot byteswap!"
) ? static_cast<void> (0) : __assert_fail ("BitWidth >= 16 && BitWidth % 16 == 0 && \"Cannot byteswap!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 673, __PRETTY_FUNCTION__))
;
674 if (BitWidth == 16)
675 return APInt(BitWidth, ByteSwap_16(uint16_t(U.VAL)));
676 if (BitWidth == 32)
677 return APInt(BitWidth, ByteSwap_32(unsigned(U.VAL)));
678 if (BitWidth == 48) {
679 unsigned Tmp1 = unsigned(U.VAL >> 16);
680 Tmp1 = ByteSwap_32(Tmp1);
681 uint16_t Tmp2 = uint16_t(U.VAL);
682 Tmp2 = ByteSwap_16(Tmp2);
683 return APInt(BitWidth, (uint64_t(Tmp2) << 32) | Tmp1);
684 }
685 if (BitWidth == 64)
686 return APInt(BitWidth, ByteSwap_64(U.VAL));
687
688 APInt Result(getNumWords() * APINT_BITS_PER_WORD, 0);
689 for (unsigned I = 0, N = getNumWords(); I != N; ++I)
690 Result.U.pVal[I] = ByteSwap_64(U.pVal[N - I - 1]);
691 if (Result.BitWidth != BitWidth) {
692 Result.lshrInPlace(Result.BitWidth - BitWidth);
693 Result.BitWidth = BitWidth;
694 }
695 return Result;
696}
697
698APInt APInt::reverseBits() const {
699 switch (BitWidth) {
700 case 64:
701 return APInt(BitWidth, llvm::reverseBits<uint64_t>(U.VAL));
702 case 32:
703 return APInt(BitWidth, llvm::reverseBits<uint32_t>(U.VAL));
704 case 16:
705 return APInt(BitWidth, llvm::reverseBits<uint16_t>(U.VAL));
706 case 8:
707 return APInt(BitWidth, llvm::reverseBits<uint8_t>(U.VAL));
708 default:
709 break;
710 }
711
712 APInt Val(*this);
713 APInt Reversed(BitWidth, 0);
714 unsigned S = BitWidth;
715
716 for (; Val != 0; Val.lshrInPlace(1)) {
717 Reversed <<= 1;
718 Reversed |= Val[0];
719 --S;
720 }
721
722 Reversed <<= S;
723 return Reversed;
724}
725
726APInt llvm::APIntOps::GreatestCommonDivisor(APInt A, APInt B) {
727 // Fast-path a common case.
728 if (A == B) return A;
729
730 // Corner cases: if either operand is zero, the other is the gcd.
731 if (!A) return B;
732 if (!B) return A;
733
734 // Count common powers of 2 and remove all other powers of 2.
735 unsigned Pow2;
736 {
737 unsigned Pow2_A = A.countTrailingZeros();
738 unsigned Pow2_B = B.countTrailingZeros();
739 if (Pow2_A > Pow2_B) {
740 A.lshrInPlace(Pow2_A - Pow2_B);
741 Pow2 = Pow2_B;
742 } else if (Pow2_B > Pow2_A) {
743 B.lshrInPlace(Pow2_B - Pow2_A);
744 Pow2 = Pow2_A;
745 } else {
746 Pow2 = Pow2_A;
747 }
748 }
749
750 // Both operands are odd multiples of 2^Pow_2:
751 //
752 // gcd(a, b) = gcd(|a - b| / 2^i, min(a, b))
753 //
754 // This is a modified version of Stein's algorithm, taking advantage of
755 // efficient countTrailingZeros().
756 while (A != B) {
757 if (A.ugt(B)) {
758 A -= B;
759 A.lshrInPlace(A.countTrailingZeros() - Pow2);
760 } else {
761 B -= A;
762 B.lshrInPlace(B.countTrailingZeros() - Pow2);
763 }
764 }
765
766 return A;
767}
768
769APInt llvm::APIntOps::RoundDoubleToAPInt(double Double, unsigned width) {
770 uint64_t I = bit_cast<uint64_t>(Double);
771
772 // Get the sign bit from the highest order bit
773 bool isNeg = I >> 63;
774
775 // Get the 11-bit exponent and adjust for the 1023 bit bias
776 int64_t exp = ((I >> 52) & 0x7ff) - 1023;
777
778 // If the exponent is negative, the value is < 0 so just return 0.
779 if (exp < 0)
780 return APInt(width, 0u);
781
782 // Extract the mantissa by clearing the top 12 bits (sign + exponent).
783 uint64_t mantissa = (I & (~0ULL >> 12)) | 1ULL << 52;
784
785 // If the exponent doesn't shift all bits out of the mantissa
786 if (exp < 52)
787 return isNeg ? -APInt(width, mantissa >> (52 - exp)) :
788 APInt(width, mantissa >> (52 - exp));
789
790 // If the client didn't provide enough bits for us to shift the mantissa into
791 // then the result is undefined, just return 0
792 if (width <= exp - 52)
793 return APInt(width, 0);
794
795 // Otherwise, we have to shift the mantissa bits up to the right location
796 APInt Tmp(width, mantissa);
797 Tmp <<= (unsigned)exp - 52;
798 return isNeg ? -Tmp : Tmp;
799}
800
801/// This function converts this APInt to a double.
802/// The layout for double is as following (IEEE Standard 754):
803/// --------------------------------------
804/// | Sign Exponent Fraction Bias |
805/// |-------------------------------------- |
806/// | 1[63] 11[62-52] 52[51-00] 1023 |
807/// --------------------------------------
808double APInt::roundToDouble(bool isSigned) const {
809
810 // Handle the simple case where the value is contained in one uint64_t.
811 // It is wrong to optimize getWord(0) to VAL; there might be more than one word.
812 if (isSingleWord() || getActiveBits() <= APINT_BITS_PER_WORD) {
813 if (isSigned) {
814 int64_t sext = SignExtend64(getWord(0), BitWidth);
815 return double(sext);
816 } else
817 return double(getWord(0));
818 }
819
820 // Determine if the value is negative.
821 bool isNeg = isSigned ? (*this)[BitWidth-1] : false;
822
823 // Construct the absolute value if we're negative.
824 APInt Tmp(isNeg ? -(*this) : (*this));
825
826 // Figure out how many bits we're using.
827 unsigned n = Tmp.getActiveBits();
828
829 // The exponent (without bias normalization) is just the number of bits
830 // we are using. Note that the sign bit is gone since we constructed the
831 // absolute value.
832 uint64_t exp = n;
833
834 // Return infinity for exponent overflow
835 if (exp > 1023) {
836 if (!isSigned || !isNeg)
837 return std::numeric_limits<double>::infinity();
838 else
839 return -std::numeric_limits<double>::infinity();
840 }
841 exp += 1023; // Increment for 1023 bias
842
843 // Number of bits in mantissa is 52. To obtain the mantissa value, we must
844 // extract the high 52 bits from the correct words in pVal.
845 uint64_t mantissa;
846 unsigned hiWord = whichWord(n-1);
847 if (hiWord == 0) {
848 mantissa = Tmp.U.pVal[0];
849 if (n > 52)
850 mantissa >>= n - 52; // shift down, we want the top 52 bits.
851 } else {
852 assert(hiWord > 0 && "huh?")((hiWord > 0 && "huh?") ? static_cast<void> (
0) : __assert_fail ("hiWord > 0 && \"huh?\"", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 852, __PRETTY_FUNCTION__))
;
853 uint64_t hibits = Tmp.U.pVal[hiWord] << (52 - n % APINT_BITS_PER_WORD);
854 uint64_t lobits = Tmp.U.pVal[hiWord-1] >> (11 + n % APINT_BITS_PER_WORD);
855 mantissa = hibits | lobits;
856 }
857
858 // The leading bit of mantissa is implicit, so get rid of it.
859 uint64_t sign = isNeg ? (1ULL << (APINT_BITS_PER_WORD - 1)) : 0;
860 uint64_t I = sign | (exp << 52) | mantissa;
861 return bit_cast<double>(I);
862}
863
864// Truncate to new width.
865APInt APInt::trunc(unsigned width) const {
866 assert(width < BitWidth && "Invalid APInt Truncate request")((width < BitWidth && "Invalid APInt Truncate request"
) ? static_cast<void> (0) : __assert_fail ("width < BitWidth && \"Invalid APInt Truncate request\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 866, __PRETTY_FUNCTION__))
;
867 assert(width && "Can't truncate to 0 bits")((width && "Can't truncate to 0 bits") ? static_cast<
void> (0) : __assert_fail ("width && \"Can't truncate to 0 bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 867, __PRETTY_FUNCTION__))
;
868
869 if (width <= APINT_BITS_PER_WORD)
870 return APInt(width, getRawData()[0]);
871
872 APInt Result(getMemory(getNumWords(width)), width);
873
874 // Copy full words.
875 unsigned i;
876 for (i = 0; i != width / APINT_BITS_PER_WORD; i++)
877 Result.U.pVal[i] = U.pVal[i];
878
879 // Truncate and copy any partial word.
880 unsigned bits = (0 - width) % APINT_BITS_PER_WORD;
881 if (bits != 0)
882 Result.U.pVal[i] = U.pVal[i] << bits >> bits;
883
884 return Result;
885}
886
887// Truncate to new width with unsigned saturation.
888APInt APInt::truncUSat(unsigned width) const {
889 assert(width < BitWidth && "Invalid APInt Truncate request")((width < BitWidth && "Invalid APInt Truncate request"
) ? static_cast<void> (0) : __assert_fail ("width < BitWidth && \"Invalid APInt Truncate request\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 889, __PRETTY_FUNCTION__))
;
890 assert(width && "Can't truncate to 0 bits")((width && "Can't truncate to 0 bits") ? static_cast<
void> (0) : __assert_fail ("width && \"Can't truncate to 0 bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 890, __PRETTY_FUNCTION__))
;
891
892 // Can we just losslessly truncate it?
893 if (isIntN(width))
894 return trunc(width);
895 // If not, then just return the new limit.
896 return APInt::getMaxValue(width);
897}
898
899// Truncate to new width with signed saturation.
900APInt APInt::truncSSat(unsigned width) const {
901 assert(width < BitWidth && "Invalid APInt Truncate request")((width < BitWidth && "Invalid APInt Truncate request"
) ? static_cast<void> (0) : __assert_fail ("width < BitWidth && \"Invalid APInt Truncate request\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 901, __PRETTY_FUNCTION__))
;
902 assert(width && "Can't truncate to 0 bits")((width && "Can't truncate to 0 bits") ? static_cast<
void> (0) : __assert_fail ("width && \"Can't truncate to 0 bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 902, __PRETTY_FUNCTION__))
;
903
904 // Can we just losslessly truncate it?
905 if (isSignedIntN(width))
906 return trunc(width);
907 // If not, then just return the new limits.
908 return isNegative() ? APInt::getSignedMinValue(width)
909 : APInt::getSignedMaxValue(width);
910}
911
912// Sign extend to a new width.
913APInt APInt::sext(unsigned Width) const {
914 assert(Width > BitWidth && "Invalid APInt SignExtend request")((Width > BitWidth && "Invalid APInt SignExtend request"
) ? static_cast<void> (0) : __assert_fail ("Width > BitWidth && \"Invalid APInt SignExtend request\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 914, __PRETTY_FUNCTION__))
;
915
916 if (Width <= APINT_BITS_PER_WORD)
917 return APInt(Width, SignExtend64(U.VAL, BitWidth));
918
919 APInt Result(getMemory(getNumWords(Width)), Width);
920
921 // Copy words.
922 std::memcpy(Result.U.pVal, getRawData(), getNumWords() * APINT_WORD_SIZE);
923
924 // Sign extend the last word since there may be unused bits in the input.
925 Result.U.pVal[getNumWords() - 1] =
926 SignExtend64(Result.U.pVal[getNumWords() - 1],
927 ((BitWidth - 1) % APINT_BITS_PER_WORD) + 1);
928
929 // Fill with sign bits.
930 std::memset(Result.U.pVal + getNumWords(), isNegative() ? -1 : 0,
931 (Result.getNumWords() - getNumWords()) * APINT_WORD_SIZE);
932 Result.clearUnusedBits();
933 return Result;
934}
935
936// Zero extend to a new width.
937APInt APInt::zext(unsigned width) const {
938 assert(width > BitWidth && "Invalid APInt ZeroExtend request")((width > BitWidth && "Invalid APInt ZeroExtend request"
) ? static_cast<void> (0) : __assert_fail ("width > BitWidth && \"Invalid APInt ZeroExtend request\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 938, __PRETTY_FUNCTION__))
;
939
940 if (width <= APINT_BITS_PER_WORD)
941 return APInt(width, U.VAL);
942
943 APInt Result(getMemory(getNumWords(width)), width);
944
945 // Copy words.
946 std::memcpy(Result.U.pVal, getRawData(), getNumWords() * APINT_WORD_SIZE);
947
948 // Zero remaining words.
949 std::memset(Result.U.pVal + getNumWords(), 0,
950 (Result.getNumWords() - getNumWords()) * APINT_WORD_SIZE);
951
952 return Result;
953}
954
955APInt APInt::zextOrTrunc(unsigned width) const {
956 if (BitWidth < width)
957 return zext(width);
958 if (BitWidth > width)
959 return trunc(width);
960 return *this;
961}
962
963APInt APInt::sextOrTrunc(unsigned width) const {
964 if (BitWidth < width)
965 return sext(width);
966 if (BitWidth > width)
967 return trunc(width);
968 return *this;
969}
970
971APInt APInt::zextOrSelf(unsigned width) const {
972 if (BitWidth < width)
973 return zext(width);
974 return *this;
975}
976
977APInt APInt::sextOrSelf(unsigned width) const {
978 if (BitWidth < width)
979 return sext(width);
980 return *this;
981}
982
983/// Arithmetic right-shift this APInt by shiftAmt.
984/// Arithmetic right-shift function.
985void APInt::ashrInPlace(const APInt &shiftAmt) {
986 ashrInPlace((unsigned)shiftAmt.getLimitedValue(BitWidth));
987}
988
989/// Arithmetic right-shift this APInt by shiftAmt.
990/// Arithmetic right-shift function.
991void APInt::ashrSlowCase(unsigned ShiftAmt) {
992 // Don't bother performing a no-op shift.
993 if (!ShiftAmt)
994 return;
995
996 // Save the original sign bit for later.
997 bool Negative = isNegative();
998
999 // WordShift is the inter-part shift; BitShift is intra-part shift.
1000 unsigned WordShift = ShiftAmt / APINT_BITS_PER_WORD;
1001 unsigned BitShift = ShiftAmt % APINT_BITS_PER_WORD;
1002
1003 unsigned WordsToMove = getNumWords() - WordShift;
1004 if (WordsToMove != 0) {
1005 // Sign extend the last word to fill in the unused bits.
1006 U.pVal[getNumWords() - 1] = SignExtend64(
1007 U.pVal[getNumWords() - 1], ((BitWidth - 1) % APINT_BITS_PER_WORD) + 1);
1008
1009 // Fastpath for moving by whole words.
1010 if (BitShift == 0) {
1011 std::memmove(U.pVal, U.pVal + WordShift, WordsToMove * APINT_WORD_SIZE);
1012 } else {
1013 // Move the words containing significant bits.
1014 for (unsigned i = 0; i != WordsToMove - 1; ++i)
1015 U.pVal[i] = (U.pVal[i + WordShift] >> BitShift) |
1016 (U.pVal[i + WordShift + 1] << (APINT_BITS_PER_WORD - BitShift));
1017
1018 // Handle the last word which has no high bits to copy.
1019 U.pVal[WordsToMove - 1] = U.pVal[WordShift + WordsToMove - 1] >> BitShift;
1020 // Sign extend one more time.
1021 U.pVal[WordsToMove - 1] =
1022 SignExtend64(U.pVal[WordsToMove - 1], APINT_BITS_PER_WORD - BitShift);
1023 }
1024 }
1025
1026 // Fill in the remainder based on the original sign.
1027 std::memset(U.pVal + WordsToMove, Negative ? -1 : 0,
1028 WordShift * APINT_WORD_SIZE);
1029 clearUnusedBits();
1030}
1031
1032/// Logical right-shift this APInt by shiftAmt.
1033/// Logical right-shift function.
1034void APInt::lshrInPlace(const APInt &shiftAmt) {
1035 lshrInPlace((unsigned)shiftAmt.getLimitedValue(BitWidth));
1036}
1037
1038/// Logical right-shift this APInt by shiftAmt.
1039/// Logical right-shift function.
1040void APInt::lshrSlowCase(unsigned ShiftAmt) {
1041 tcShiftRight(U.pVal, getNumWords(), ShiftAmt);
1042}
1043
1044/// Left-shift this APInt by shiftAmt.
1045/// Left-shift function.
1046APInt &APInt::operator<<=(const APInt &shiftAmt) {
1047 // It's undefined behavior in C to shift by BitWidth or greater.
1048 *this <<= (unsigned)shiftAmt.getLimitedValue(BitWidth);
1049 return *this;
1050}
1051
1052void APInt::shlSlowCase(unsigned ShiftAmt) {
1053 tcShiftLeft(U.pVal, getNumWords(), ShiftAmt);
1054 clearUnusedBits();
1055}
1056
1057// Calculate the rotate amount modulo the bit width.
1058static unsigned rotateModulo(unsigned BitWidth, const APInt &rotateAmt) {
1059 unsigned rotBitWidth = rotateAmt.getBitWidth();
1060 APInt rot = rotateAmt;
1061 if (rotBitWidth < BitWidth) {
1062 // Extend the rotate APInt, so that the urem doesn't divide by 0.
1063 // e.g. APInt(1, 32) would give APInt(1, 0).
1064 rot = rotateAmt.zext(BitWidth);
1065 }
1066 rot = rot.urem(APInt(rot.getBitWidth(), BitWidth));
1067 return rot.getLimitedValue(BitWidth);
1068}
1069
1070APInt APInt::rotl(const APInt &rotateAmt) const {
1071 return rotl(rotateModulo(BitWidth, rotateAmt));
1072}
1073
1074APInt APInt::rotl(unsigned rotateAmt) const {
1075 rotateAmt %= BitWidth;
1076 if (rotateAmt == 0)
1077 return *this;
1078 return shl(rotateAmt) | lshr(BitWidth - rotateAmt);
1079}
1080
1081APInt APInt::rotr(const APInt &rotateAmt) const {
1082 return rotr(rotateModulo(BitWidth, rotateAmt));
1083}
1084
1085APInt APInt::rotr(unsigned rotateAmt) const {
1086 rotateAmt %= BitWidth;
1087 if (rotateAmt == 0)
1088 return *this;
1089 return lshr(rotateAmt) | shl(BitWidth - rotateAmt);
1090}
1091
1092// Square Root - this method computes and returns the square root of "this".
1093// Three mechanisms are used for computation. For small values (<= 5 bits),
1094// a table lookup is done. This gets some performance for common cases. For
1095// values using less than 52 bits, the value is converted to double and then
1096// the libc sqrt function is called. The result is rounded and then converted
1097// back to a uint64_t which is then used to construct the result. Finally,
1098// the Babylonian method for computing square roots is used.
1099APInt APInt::sqrt() const {
1100
1101 // Determine the magnitude of the value.
1102 unsigned magnitude = getActiveBits();
1103
1104 // Use a fast table for some small values. This also gets rid of some
1105 // rounding errors in libc sqrt for small values.
1106 if (magnitude <= 5) {
20
Assuming 'magnitude' is > 5
21
Taking false branch
1107 static const uint8_t results[32] = {
1108 /* 0 */ 0,
1109 /* 1- 2 */ 1, 1,
1110 /* 3- 6 */ 2, 2, 2, 2,
1111 /* 7-12 */ 3, 3, 3, 3, 3, 3,
1112 /* 13-20 */ 4, 4, 4, 4, 4, 4, 4, 4,
1113 /* 21-30 */ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
1114 /* 31 */ 6
1115 };
1116 return APInt(BitWidth, results[ (isSingleWord() ? U.VAL : U.pVal[0]) ]);
1117 }
1118
1119 // If the magnitude of the value fits in less than 52 bits (the precision of
1120 // an IEEE double precision floating point value), then we can use the
1121 // libc sqrt function which will probably use a hardware sqrt computation.
1122 // This should be faster than the algorithm below.
1123 if (magnitude < 52) {
22
Assuming 'magnitude' is >= 52
23
Taking false branch
1124 return APInt(BitWidth,
1125 uint64_t(::round(::sqrt(double(isSingleWord() ? U.VAL
1126 : U.pVal[0])))));
1127 }
1128
1129 // Okay, all the short cuts are exhausted. We must compute it. The following
1130 // is a classical Babylonian method for computing the square root. This code
1131 // was adapted to APInt from a wikipedia article on such computations.
1132 // See http://www.wikipedia.org/ and go to the page named
1133 // Calculate_an_integer_square_root.
1134 unsigned nbits = BitWidth, i = 4;
1135 APInt testy(BitWidth, 16);
1136 APInt x_old(BitWidth, 1);
24
Calling constructor for 'APInt'
32
Returning from constructor for 'APInt'
1137 APInt x_new(BitWidth, 0);
1138 APInt two(BitWidth, 2);
1139
1140 // Select a good starting value using binary logarithms.
1141 for (;; i += 2, testy = testy.shl(2))
33
Loop condition is true. Entering loop body
1142 if (i
33.1
'i' is < 'nbits'
33.1
'i' is < 'nbits'
>= nbits || this->ule(testy)) {
34
Taking true branch
1143 x_old = x_old.shl(i / 2);
35
Calling move assignment operator for 'APInt'
39
Returning; memory was released
1144 break;
40
Execution continues on line 1148
1145 }
1146
1147 // Use the Babylonian method to arrive at the integer square root:
1148 for (;;) {
41
Loop condition is true. Entering loop body
1149 x_new = (this->udiv(x_old) + x_old).udiv(two);
42
Calling 'operator+'
1150 if (x_old.ule(x_new))
1151 break;
1152 x_old = x_new;
1153 }
1154
1155 // Make sure we return the closest approximation
1156 // NOTE: The rounding calculation below is correct. It will produce an
1157 // off-by-one discrepancy with results from pari/gp. That discrepancy has been
1158 // determined to be a rounding issue with pari/gp as it begins to use a
1159 // floating point representation after 192 bits. There are no discrepancies
1160 // between this algorithm and pari/gp for bit widths < 192 bits.
1161 APInt square(x_old * x_old);
1162 APInt nextSquare((x_old + 1) * (x_old +1));
1163 if (this->ult(square))
1164 return x_old;
1165 assert(this->ule(nextSquare) && "Error in APInt::sqrt computation")((this->ule(nextSquare) && "Error in APInt::sqrt computation"
) ? static_cast<void> (0) : __assert_fail ("this->ule(nextSquare) && \"Error in APInt::sqrt computation\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1165, __PRETTY_FUNCTION__))
;
1166 APInt midpoint((nextSquare - square).udiv(two));
1167 APInt offset(*this - square);
1168 if (offset.ult(midpoint))
1169 return x_old;
1170 return x_old + 1;
1171}
1172
1173/// Computes the multiplicative inverse of this APInt for a given modulo. The
1174/// iterative extended Euclidean algorithm is used to solve for this value,
1175/// however we simplify it to speed up calculating only the inverse, and take
1176/// advantage of div+rem calculations. We also use some tricks to avoid copying
1177/// (potentially large) APInts around.
1178/// WARNING: a value of '0' may be returned,
1179/// signifying that no multiplicative inverse exists!
1180APInt APInt::multiplicativeInverse(const APInt& modulo) const {
1181 assert(ult(modulo) && "This APInt must be smaller than the modulo")((ult(modulo) && "This APInt must be smaller than the modulo"
) ? static_cast<void> (0) : __assert_fail ("ult(modulo) && \"This APInt must be smaller than the modulo\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1181, __PRETTY_FUNCTION__))
;
1182
1183 // Using the properties listed at the following web page (accessed 06/21/08):
1184 // http://www.numbertheory.org/php/euclid.html
1185 // (especially the properties numbered 3, 4 and 9) it can be proved that
1186 // BitWidth bits suffice for all the computations in the algorithm implemented
1187 // below. More precisely, this number of bits suffice if the multiplicative
1188 // inverse exists, but may not suffice for the general extended Euclidean
1189 // algorithm.
1190
1191 APInt r[2] = { modulo, *this };
1192 APInt t[2] = { APInt(BitWidth, 0), APInt(BitWidth, 1) };
1193 APInt q(BitWidth, 0);
1194
1195 unsigned i;
1196 for (i = 0; r[i^1] != 0; i ^= 1) {
1197 // An overview of the math without the confusing bit-flipping:
1198 // q = r[i-2] / r[i-1]
1199 // r[i] = r[i-2] % r[i-1]
1200 // t[i] = t[i-2] - t[i-1] * q
1201 udivrem(r[i], r[i^1], q, r[i]);
1202 t[i] -= t[i^1] * q;
1203 }
1204
1205 // If this APInt and the modulo are not coprime, there is no multiplicative
1206 // inverse, so return 0. We check this by looking at the next-to-last
1207 // remainder, which is the gcd(*this,modulo) as calculated by the Euclidean
1208 // algorithm.
1209 if (r[i] != 1)
1210 return APInt(BitWidth, 0);
1211
1212 // The next-to-last t is the multiplicative inverse. However, we are
1213 // interested in a positive inverse. Calculate a positive one from a negative
1214 // one if necessary. A simple addition of the modulo suffices because
1215 // abs(t[i]) is known to be less than *this/2 (see the link above).
1216 if (t[i].isNegative())
1217 t[i] += modulo;
1218
1219 return std::move(t[i]);
1220}
1221
1222/// Calculate the magic numbers required to implement a signed integer division
1223/// by a constant as a sequence of multiplies, adds and shifts. Requires that
1224/// the divisor not be 0, 1, or -1. Taken from "Hacker's Delight", Henry S.
1225/// Warren, Jr., chapter 10.
1226APInt::ms APInt::magic() const {
1227 const APInt& d = *this;
1228 unsigned p;
1229 APInt ad, anc, delta, q1, r1, q2, r2, t;
1230 APInt signedMin = APInt::getSignedMinValue(d.getBitWidth());
1231 struct ms mag;
1232
1233 ad = d.abs();
1234 t = signedMin + (d.lshr(d.getBitWidth() - 1));
1235 anc = t - 1 - t.urem(ad); // absolute value of nc
1236 p = d.getBitWidth() - 1; // initialize p
1237 q1 = signedMin.udiv(anc); // initialize q1 = 2p/abs(nc)
1238 r1 = signedMin - q1*anc; // initialize r1 = rem(2p,abs(nc))
1239 q2 = signedMin.udiv(ad); // initialize q2 = 2p/abs(d)
1240 r2 = signedMin - q2*ad; // initialize r2 = rem(2p,abs(d))
1241 do {
1242 p = p + 1;
1243 q1 = q1<<1; // update q1 = 2p/abs(nc)
1244 r1 = r1<<1; // update r1 = rem(2p/abs(nc))
1245 if (r1.uge(anc)) { // must be unsigned comparison
1246 q1 = q1 + 1;
1247 r1 = r1 - anc;
1248 }
1249 q2 = q2<<1; // update q2 = 2p/abs(d)
1250 r2 = r2<<1; // update r2 = rem(2p/abs(d))
1251 if (r2.uge(ad)) { // must be unsigned comparison
1252 q2 = q2 + 1;
1253 r2 = r2 - ad;
1254 }
1255 delta = ad - r2;
1256 } while (q1.ult(delta) || (q1 == delta && r1 == 0));
1257
1258 mag.m = q2 + 1;
1259 if (d.isNegative()) mag.m = -mag.m; // resulting magic number
1260 mag.s = p - d.getBitWidth(); // resulting shift
1261 return mag;
1262}
1263
1264/// Calculate the magic numbers required to implement an unsigned integer
1265/// division by a constant as a sequence of multiplies, adds and shifts.
1266/// Requires that the divisor not be 0. Taken from "Hacker's Delight", Henry
1267/// S. Warren, Jr., chapter 10.
1268/// LeadingZeros can be used to simplify the calculation if the upper bits
1269/// of the divided value are known zero.
1270APInt::mu APInt::magicu(unsigned LeadingZeros) const {
1271 const APInt& d = *this;
1272 unsigned p;
1273 APInt nc, delta, q1, r1, q2, r2;
1274 struct mu magu;
1275 magu.a = 0; // initialize "add" indicator
1276 APInt allOnes = APInt::getAllOnesValue(d.getBitWidth()).lshr(LeadingZeros);
1277 APInt signedMin = APInt::getSignedMinValue(d.getBitWidth());
1278 APInt signedMax = APInt::getSignedMaxValue(d.getBitWidth());
1279
1280 nc = allOnes - (allOnes - d).urem(d);
1281 p = d.getBitWidth() - 1; // initialize p
1282 q1 = signedMin.udiv(nc); // initialize q1 = 2p/nc
1283 r1 = signedMin - q1*nc; // initialize r1 = rem(2p,nc)
1284 q2 = signedMax.udiv(d); // initialize q2 = (2p-1)/d
1285 r2 = signedMax - q2*d; // initialize r2 = rem((2p-1),d)
1286 do {
1287 p = p + 1;
1288 if (r1.uge(nc - r1)) {
1289 q1 = q1 + q1 + 1; // update q1
1290 r1 = r1 + r1 - nc; // update r1
1291 }
1292 else {
1293 q1 = q1+q1; // update q1
1294 r1 = r1+r1; // update r1
1295 }
1296 if ((r2 + 1).uge(d - r2)) {
1297 if (q2.uge(signedMax)) magu.a = 1;
1298 q2 = q2+q2 + 1; // update q2
1299 r2 = r2+r2 + 1 - d; // update r2
1300 }
1301 else {
1302 if (q2.uge(signedMin)) magu.a = 1;
1303 q2 = q2+q2; // update q2
1304 r2 = r2+r2 + 1; // update r2
1305 }
1306 delta = d - 1 - r2;
1307 } while (p < d.getBitWidth()*2 &&
1308 (q1.ult(delta) || (q1 == delta && r1 == 0)));
1309 magu.m = q2 + 1; // resulting magic number
1310 magu.s = p - d.getBitWidth(); // resulting shift
1311 return magu;
1312}
1313
1314/// Implementation of Knuth's Algorithm D (Division of nonnegative integers)
1315/// from "Art of Computer Programming, Volume 2", section 4.3.1, p. 272. The
1316/// variables here have the same names as in the algorithm. Comments explain
1317/// the algorithm and any deviation from it.
1318static void KnuthDiv(uint32_t *u, uint32_t *v, uint32_t *q, uint32_t* r,
1319 unsigned m, unsigned n) {
1320 assert(u && "Must provide dividend")((u && "Must provide dividend") ? static_cast<void
> (0) : __assert_fail ("u && \"Must provide dividend\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1320, __PRETTY_FUNCTION__))
;
1321 assert(v && "Must provide divisor")((v && "Must provide divisor") ? static_cast<void>
(0) : __assert_fail ("v && \"Must provide divisor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1321, __PRETTY_FUNCTION__))
;
1322 assert(q && "Must provide quotient")((q && "Must provide quotient") ? static_cast<void
> (0) : __assert_fail ("q && \"Must provide quotient\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1322, __PRETTY_FUNCTION__))
;
1323 assert(u != v && u != q && v != q && "Must use different memory")((u != v && u != q && v != q && "Must use different memory"
) ? static_cast<void> (0) : __assert_fail ("u != v && u != q && v != q && \"Must use different memory\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1323, __PRETTY_FUNCTION__))
;
1324 assert(n>1 && "n must be > 1")((n>1 && "n must be > 1") ? static_cast<void
> (0) : __assert_fail ("n>1 && \"n must be > 1\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1324, __PRETTY_FUNCTION__))
;
1325
1326 // b denotes the base of the number system. In our case b is 2^32.
1327 const uint64_t b = uint64_t(1) << 32;
1328
1329// The DEBUG macros here tend to be spam in the debug output if you're not
1330// debugging this code. Disable them unless KNUTH_DEBUG is defined.
1331#ifdef KNUTH_DEBUG
1332#define DEBUG_KNUTH(X)do {} while(false) LLVM_DEBUG(X)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("apint")) { X; } } while (false)
1333#else
1334#define DEBUG_KNUTH(X)do {} while(false) do {} while(false)
1335#endif
1336
1337 DEBUG_KNUTH(dbgs() << "KnuthDiv: m=" << m << " n=" << n << '\n')do {} while(false);
1338 DEBUG_KNUTH(dbgs() << "KnuthDiv: original:")do {} while(false);
1339 DEBUG_KNUTH(for (int i = m + n; i >= 0; i--) dbgs() << " " << u[i])do {} while(false);
1340 DEBUG_KNUTH(dbgs() << " by")do {} while(false);
1341 DEBUG_KNUTH(for (int i = n; i > 0; i--) dbgs() << " " << v[i - 1])do {} while(false);
1342 DEBUG_KNUTH(dbgs() << '\n')do {} while(false);
1343 // D1. [Normalize.] Set d = b / (v[n-1] + 1) and multiply all the digits of
1344 // u and v by d. Note that we have taken Knuth's advice here to use a power
1345 // of 2 value for d such that d * v[n-1] >= b/2 (b is the base). A power of
1346 // 2 allows us to shift instead of multiply and it is easy to determine the
1347 // shift amount from the leading zeros. We are basically normalizing the u
1348 // and v so that its high bits are shifted to the top of v's range without
1349 // overflow. Note that this can require an extra word in u so that u must
1350 // be of length m+n+1.
1351 unsigned shift = countLeadingZeros(v[n-1]);
1352 uint32_t v_carry = 0;
1353 uint32_t u_carry = 0;
1354 if (shift) {
1355 for (unsigned i = 0; i < m+n; ++i) {
1356 uint32_t u_tmp = u[i] >> (32 - shift);
1357 u[i] = (u[i] << shift) | u_carry;
1358 u_carry = u_tmp;
1359 }
1360 for (unsigned i = 0; i < n; ++i) {
1361 uint32_t v_tmp = v[i] >> (32 - shift);
1362 v[i] = (v[i] << shift) | v_carry;
1363 v_carry = v_tmp;
1364 }
1365 }
1366 u[m+n] = u_carry;
1367
1368 DEBUG_KNUTH(dbgs() << "KnuthDiv: normal:")do {} while(false);
1369 DEBUG_KNUTH(for (int i = m + n; i >= 0; i--) dbgs() << " " << u[i])do {} while(false);
1370 DEBUG_KNUTH(dbgs() << " by")do {} while(false);
1371 DEBUG_KNUTH(for (int i = n; i > 0; i--) dbgs() << " " << v[i - 1])do {} while(false);
1372 DEBUG_KNUTH(dbgs() << '\n')do {} while(false);
1373
1374 // D2. [Initialize j.] Set j to m. This is the loop counter over the places.
1375 int j = m;
1376 do {
1377 DEBUG_KNUTH(dbgs() << "KnuthDiv: quotient digit #" << j << '\n')do {} while(false);
1378 // D3. [Calculate q'.].
1379 // Set qp = (u[j+n]*b + u[j+n-1]) / v[n-1]. (qp=qprime=q')
1380 // Set rp = (u[j+n]*b + u[j+n-1]) % v[n-1]. (rp=rprime=r')
1381 // Now test if qp == b or qp*v[n-2] > b*rp + u[j+n-2]; if so, decrease
1382 // qp by 1, increase rp by v[n-1], and repeat this test if rp < b. The test
1383 // on v[n-2] determines at high speed most of the cases in which the trial
1384 // value qp is one too large, and it eliminates all cases where qp is two
1385 // too large.
1386 uint64_t dividend = Make_64(u[j+n], u[j+n-1]);
1387 DEBUG_KNUTH(dbgs() << "KnuthDiv: dividend == " << dividend << '\n')do {} while(false);
1388 uint64_t qp = dividend / v[n-1];
1389 uint64_t rp = dividend % v[n-1];
1390 if (qp == b || qp*v[n-2] > b*rp + u[j+n-2]) {
1391 qp--;
1392 rp += v[n-1];
1393 if (rp < b && (qp == b || qp*v[n-2] > b*rp + u[j+n-2]))
1394 qp--;
1395 }
1396 DEBUG_KNUTH(dbgs() << "KnuthDiv: qp == " << qp << ", rp == " << rp << '\n')do {} while(false);
1397
1398 // D4. [Multiply and subtract.] Replace (u[j+n]u[j+n-1]...u[j]) with
1399 // (u[j+n]u[j+n-1]..u[j]) - qp * (v[n-1]...v[1]v[0]). This computation
1400 // consists of a simple multiplication by a one-place number, combined with
1401 // a subtraction.
1402 // The digits (u[j+n]...u[j]) should be kept positive; if the result of
1403 // this step is actually negative, (u[j+n]...u[j]) should be left as the
1404 // true value plus b**(n+1), namely as the b's complement of
1405 // the true value, and a "borrow" to the left should be remembered.
1406 int64_t borrow = 0;
1407 for (unsigned i = 0; i < n; ++i) {
1408 uint64_t p = uint64_t(qp) * uint64_t(v[i]);
1409 int64_t subres = int64_t(u[j+i]) - borrow - Lo_32(p);
1410 u[j+i] = Lo_32(subres);
1411 borrow = Hi_32(p) - Hi_32(subres);
1412 DEBUG_KNUTH(dbgs() << "KnuthDiv: u[j+i] = " << u[j + i]do {} while(false)
1413 << ", borrow = " << borrow << '\n')do {} while(false);
1414 }
1415 bool isNeg = u[j+n] < borrow;
1416 u[j+n] -= Lo_32(borrow);
1417
1418 DEBUG_KNUTH(dbgs() << "KnuthDiv: after subtraction:")do {} while(false);
1419 DEBUG_KNUTH(for (int i = m + n; i >= 0; i--) dbgs() << " " << u[i])do {} while(false);
1420 DEBUG_KNUTH(dbgs() << '\n')do {} while(false);
1421
1422 // D5. [Test remainder.] Set q[j] = qp. If the result of step D4 was
1423 // negative, go to step D6; otherwise go on to step D7.
1424 q[j] = Lo_32(qp);
1425 if (isNeg) {
1426 // D6. [Add back]. The probability that this step is necessary is very
1427 // small, on the order of only 2/b. Make sure that test data accounts for
1428 // this possibility. Decrease q[j] by 1
1429 q[j]--;
1430 // and add (0v[n-1]...v[1]v[0]) to (u[j+n]u[j+n-1]...u[j+1]u[j]).
1431 // A carry will occur to the left of u[j+n], and it should be ignored
1432 // since it cancels with the borrow that occurred in D4.
1433 bool carry = false;
1434 for (unsigned i = 0; i < n; i++) {
1435 uint32_t limit = std::min(u[j+i],v[i]);
1436 u[j+i] += v[i] + carry;
1437 carry = u[j+i] < limit || (carry && u[j+i] == limit);
1438 }
1439 u[j+n] += carry;
1440 }
1441 DEBUG_KNUTH(dbgs() << "KnuthDiv: after correction:")do {} while(false);
1442 DEBUG_KNUTH(for (int i = m + n; i >= 0; i--) dbgs() << " " << u[i])do {} while(false);
1443 DEBUG_KNUTH(dbgs() << "\nKnuthDiv: digit result = " << q[j] << '\n')do {} while(false);
1444
1445 // D7. [Loop on j.] Decrease j by one. Now if j >= 0, go back to D3.
1446 } while (--j >= 0);
1447
1448 DEBUG_KNUTH(dbgs() << "KnuthDiv: quotient:")do {} while(false);
1449 DEBUG_KNUTH(for (int i = m; i >= 0; i--) dbgs() << " " << q[i])do {} while(false);
1450 DEBUG_KNUTH(dbgs() << '\n')do {} while(false);
1451
1452 // D8. [Unnormalize]. Now q[...] is the desired quotient, and the desired
1453 // remainder may be obtained by dividing u[...] by d. If r is non-null we
1454 // compute the remainder (urem uses this).
1455 if (r) {
1456 // The value d is expressed by the "shift" value above since we avoided
1457 // multiplication by d by using a shift left. So, all we have to do is
1458 // shift right here.
1459 if (shift) {
1460 uint32_t carry = 0;
1461 DEBUG_KNUTH(dbgs() << "KnuthDiv: remainder:")do {} while(false);
1462 for (int i = n-1; i >= 0; i--) {
1463 r[i] = (u[i] >> shift) | carry;
1464 carry = u[i] << (32 - shift);
1465 DEBUG_KNUTH(dbgs() << " " << r[i])do {} while(false);
1466 }
1467 } else {
1468 for (int i = n-1; i >= 0; i--) {
1469 r[i] = u[i];
1470 DEBUG_KNUTH(dbgs() << " " << r[i])do {} while(false);
1471 }
1472 }
1473 DEBUG_KNUTH(dbgs() << '\n')do {} while(false);
1474 }
1475 DEBUG_KNUTH(dbgs() << '\n')do {} while(false);
1476}
1477
1478void APInt::divide(const WordType *LHS, unsigned lhsWords, const WordType *RHS,
1479 unsigned rhsWords, WordType *Quotient, WordType *Remainder) {
1480 assert(lhsWords >= rhsWords && "Fractional result")((lhsWords >= rhsWords && "Fractional result") ? static_cast
<void> (0) : __assert_fail ("lhsWords >= rhsWords && \"Fractional result\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1480, __PRETTY_FUNCTION__))
;
1481
1482 // First, compose the values into an array of 32-bit words instead of
1483 // 64-bit words. This is a necessity of both the "short division" algorithm
1484 // and the Knuth "classical algorithm" which requires there to be native
1485 // operations for +, -, and * on an m bit value with an m*2 bit result. We
1486 // can't use 64-bit operands here because we don't have native results of
1487 // 128-bits. Furthermore, casting the 64-bit values to 32-bit values won't
1488 // work on large-endian machines.
1489 unsigned n = rhsWords * 2;
1490 unsigned m = (lhsWords * 2) - n;
1491
1492 // Allocate space for the temporary values we need either on the stack, if
1493 // it will fit, or on the heap if it won't.
1494 uint32_t SPACE[128];
1495 uint32_t *U = nullptr;
1496 uint32_t *V = nullptr;
1497 uint32_t *Q = nullptr;
1498 uint32_t *R = nullptr;
1499 if ((Remainder?4:3)*n+2*m+1 <= 128) {
1500 U = &SPACE[0];
1501 V = &SPACE[m+n+1];
1502 Q = &SPACE[(m+n+1) + n];
1503 if (Remainder)
1504 R = &SPACE[(m+n+1) + n + (m+n)];
1505 } else {
1506 U = new uint32_t[m + n + 1];
1507 V = new uint32_t[n];
1508 Q = new uint32_t[m+n];
1509 if (Remainder)
1510 R = new uint32_t[n];
1511 }
1512
1513 // Initialize the dividend
1514 memset(U, 0, (m+n+1)*sizeof(uint32_t));
1515 for (unsigned i = 0; i < lhsWords; ++i) {
1516 uint64_t tmp = LHS[i];
1517 U[i * 2] = Lo_32(tmp);
1518 U[i * 2 + 1] = Hi_32(tmp);
1519 }
1520 U[m+n] = 0; // this extra word is for "spill" in the Knuth algorithm.
1521
1522 // Initialize the divisor
1523 memset(V, 0, (n)*sizeof(uint32_t));
1524 for (unsigned i = 0; i < rhsWords; ++i) {
1525 uint64_t tmp = RHS[i];
1526 V[i * 2] = Lo_32(tmp);
1527 V[i * 2 + 1] = Hi_32(tmp);
1528 }
1529
1530 // initialize the quotient and remainder
1531 memset(Q, 0, (m+n) * sizeof(uint32_t));
1532 if (Remainder)
1533 memset(R, 0, n * sizeof(uint32_t));
1534
1535 // Now, adjust m and n for the Knuth division. n is the number of words in
1536 // the divisor. m is the number of words by which the dividend exceeds the
1537 // divisor (i.e. m+n is the length of the dividend). These sizes must not
1538 // contain any zero words or the Knuth algorithm fails.
1539 for (unsigned i = n; i > 0 && V[i-1] == 0; i--) {
1540 n--;
1541 m++;
1542 }
1543 for (unsigned i = m+n; i > 0 && U[i-1] == 0; i--)
1544 m--;
1545
1546 // If we're left with only a single word for the divisor, Knuth doesn't work
1547 // so we implement the short division algorithm here. This is much simpler
1548 // and faster because we are certain that we can divide a 64-bit quantity
1549 // by a 32-bit quantity at hardware speed and short division is simply a
1550 // series of such operations. This is just like doing short division but we
1551 // are using base 2^32 instead of base 10.
1552 assert(n != 0 && "Divide by zero?")((n != 0 && "Divide by zero?") ? static_cast<void>
(0) : __assert_fail ("n != 0 && \"Divide by zero?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1552, __PRETTY_FUNCTION__))
;
1553 if (n == 1) {
1554 uint32_t divisor = V[0];
1555 uint32_t remainder = 0;
1556 for (int i = m; i >= 0; i--) {
1557 uint64_t partial_dividend = Make_64(remainder, U[i]);
1558 if (partial_dividend == 0) {
1559 Q[i] = 0;
1560 remainder = 0;
1561 } else if (partial_dividend < divisor) {
1562 Q[i] = 0;
1563 remainder = Lo_32(partial_dividend);
1564 } else if (partial_dividend == divisor) {
1565 Q[i] = 1;
1566 remainder = 0;
1567 } else {
1568 Q[i] = Lo_32(partial_dividend / divisor);
1569 remainder = Lo_32(partial_dividend - (Q[i] * divisor));
1570 }
1571 }
1572 if (R)
1573 R[0] = remainder;
1574 } else {
1575 // Now we're ready to invoke the Knuth classical divide algorithm. In this
1576 // case n > 1.
1577 KnuthDiv(U, V, Q, R, m, n);
1578 }
1579
1580 // If the caller wants the quotient
1581 if (Quotient) {
1582 for (unsigned i = 0; i < lhsWords; ++i)
1583 Quotient[i] = Make_64(Q[i*2+1], Q[i*2]);
1584 }
1585
1586 // If the caller wants the remainder
1587 if (Remainder) {
1588 for (unsigned i = 0; i < rhsWords; ++i)
1589 Remainder[i] = Make_64(R[i*2+1], R[i*2]);
1590 }
1591
1592 // Clean up the memory we allocated.
1593 if (U != &SPACE[0]) {
1594 delete [] U;
1595 delete [] V;
1596 delete [] Q;
1597 delete [] R;
1598 }
1599}
1600
1601APInt APInt::udiv(const APInt &RHS) const {
1602 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1602, __PRETTY_FUNCTION__))
;
1603
1604 // First, deal with the easy case
1605 if (isSingleWord()) {
1606 assert(RHS.U.VAL != 0 && "Divide by zero?")((RHS.U.VAL != 0 && "Divide by zero?") ? static_cast<
void> (0) : __assert_fail ("RHS.U.VAL != 0 && \"Divide by zero?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1606, __PRETTY_FUNCTION__))
;
1607 return APInt(BitWidth, U.VAL / RHS.U.VAL);
1608 }
1609
1610 // Get some facts about the LHS and RHS number of bits and words
1611 unsigned lhsWords = getNumWords(getActiveBits());
1612 unsigned rhsBits = RHS.getActiveBits();
1613 unsigned rhsWords = getNumWords(rhsBits);
1614 assert(rhsWords && "Divided by zero???")((rhsWords && "Divided by zero???") ? static_cast<
void> (0) : __assert_fail ("rhsWords && \"Divided by zero???\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1614, __PRETTY_FUNCTION__))
;
1615
1616 // Deal with some degenerate cases
1617 if (!lhsWords)
1618 // 0 / X ===> 0
1619 return APInt(BitWidth, 0);
1620 if (rhsBits == 1)
1621 // X / 1 ===> X
1622 return *this;
1623 if (lhsWords < rhsWords || this->ult(RHS))
1624 // X / Y ===> 0, iff X < Y
1625 return APInt(BitWidth, 0);
1626 if (*this == RHS)
1627 // X / X ===> 1
1628 return APInt(BitWidth, 1);
1629 if (lhsWords == 1) // rhsWords is 1 if lhsWords is 1.
1630 // All high words are zero, just use native divide
1631 return APInt(BitWidth, this->U.pVal[0] / RHS.U.pVal[0]);
1632
1633 // We have to compute it the hard way. Invoke the Knuth divide algorithm.
1634 APInt Quotient(BitWidth, 0); // to hold result.
1635 divide(U.pVal, lhsWords, RHS.U.pVal, rhsWords, Quotient.U.pVal, nullptr);
1636 return Quotient;
1637}
1638
1639APInt APInt::udiv(uint64_t RHS) const {
1640 assert(RHS != 0 && "Divide by zero?")((RHS != 0 && "Divide by zero?") ? static_cast<void
> (0) : __assert_fail ("RHS != 0 && \"Divide by zero?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1640, __PRETTY_FUNCTION__))
;
1641
1642 // First, deal with the easy case
1643 if (isSingleWord())
1644 return APInt(BitWidth, U.VAL / RHS);
1645
1646 // Get some facts about the LHS words.
1647 unsigned lhsWords = getNumWords(getActiveBits());
1648
1649 // Deal with some degenerate cases
1650 if (!lhsWords)
1651 // 0 / X ===> 0
1652 return APInt(BitWidth, 0);
1653 if (RHS == 1)
1654 // X / 1 ===> X
1655 return *this;
1656 if (this->ult(RHS))
1657 // X / Y ===> 0, iff X < Y
1658 return APInt(BitWidth, 0);
1659 if (*this == RHS)
1660 // X / X ===> 1
1661 return APInt(BitWidth, 1);
1662 if (lhsWords == 1) // rhsWords is 1 if lhsWords is 1.
1663 // All high words are zero, just use native divide
1664 return APInt(BitWidth, this->U.pVal[0] / RHS);
1665
1666 // We have to compute it the hard way. Invoke the Knuth divide algorithm.
1667 APInt Quotient(BitWidth, 0); // to hold result.
1668 divide(U.pVal, lhsWords, &RHS, 1, Quotient.U.pVal, nullptr);
1669 return Quotient;
1670}
1671
1672APInt APInt::sdiv(const APInt &RHS) const {
1673 if (isNegative()) {
1674 if (RHS.isNegative())
1675 return (-(*this)).udiv(-RHS);
1676 return -((-(*this)).udiv(RHS));
1677 }
1678 if (RHS.isNegative())
1679 return -(this->udiv(-RHS));
1680 return this->udiv(RHS);
1681}
1682
1683APInt APInt::sdiv(int64_t RHS) const {
1684 if (isNegative()) {
1685 if (RHS < 0)
1686 return (-(*this)).udiv(-RHS);
1687 return -((-(*this)).udiv(RHS));
1688 }
1689 if (RHS < 0)
1690 return -(this->udiv(-RHS));
1691 return this->udiv(RHS);
1692}
1693
1694APInt APInt::urem(const APInt &RHS) const {
1695 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1695, __PRETTY_FUNCTION__))
;
1696 if (isSingleWord()) {
1697 assert(RHS.U.VAL != 0 && "Remainder by zero?")((RHS.U.VAL != 0 && "Remainder by zero?") ? static_cast
<void> (0) : __assert_fail ("RHS.U.VAL != 0 && \"Remainder by zero?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1697, __PRETTY_FUNCTION__))
;
1698 return APInt(BitWidth, U.VAL % RHS.U.VAL);
1699 }
1700
1701 // Get some facts about the LHS
1702 unsigned lhsWords = getNumWords(getActiveBits());
1703
1704 // Get some facts about the RHS
1705 unsigned rhsBits = RHS.getActiveBits();
1706 unsigned rhsWords = getNumWords(rhsBits);
1707 assert(rhsWords && "Performing remainder operation by zero ???")((rhsWords && "Performing remainder operation by zero ???"
) ? static_cast<void> (0) : __assert_fail ("rhsWords && \"Performing remainder operation by zero ???\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1707, __PRETTY_FUNCTION__))
;
1708
1709 // Check the degenerate cases
1710 if (lhsWords == 0)
1711 // 0 % Y ===> 0
1712 return APInt(BitWidth, 0);
1713 if (rhsBits == 1)
1714 // X % 1 ===> 0
1715 return APInt(BitWidth, 0);
1716 if (lhsWords < rhsWords || this->ult(RHS))
1717 // X % Y ===> X, iff X < Y
1718 return *this;
1719 if (*this == RHS)
1720 // X % X == 0;
1721 return APInt(BitWidth, 0);
1722 if (lhsWords == 1)
1723 // All high words are zero, just use native remainder
1724 return APInt(BitWidth, U.pVal[0] % RHS.U.pVal[0]);
1725
1726 // We have to compute it the hard way. Invoke the Knuth divide algorithm.
1727 APInt Remainder(BitWidth, 0);
1728 divide(U.pVal, lhsWords, RHS.U.pVal, rhsWords, nullptr, Remainder.U.pVal);
1729 return Remainder;
1730}
1731
1732uint64_t APInt::urem(uint64_t RHS) const {
1733 assert(RHS != 0 && "Remainder by zero?")((RHS != 0 && "Remainder by zero?") ? static_cast<
void> (0) : __assert_fail ("RHS != 0 && \"Remainder by zero?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1733, __PRETTY_FUNCTION__))
;
1734
1735 if (isSingleWord())
1736 return U.VAL % RHS;
1737
1738 // Get some facts about the LHS
1739 unsigned lhsWords = getNumWords(getActiveBits());
1740
1741 // Check the degenerate cases
1742 if (lhsWords == 0)
1743 // 0 % Y ===> 0
1744 return 0;
1745 if (RHS == 1)
1746 // X % 1 ===> 0
1747 return 0;
1748 if (this->ult(RHS))
1749 // X % Y ===> X, iff X < Y
1750 return getZExtValue();
1751 if (*this == RHS)
1752 // X % X == 0;
1753 return 0;
1754 if (lhsWords == 1)
1755 // All high words are zero, just use native remainder
1756 return U.pVal[0] % RHS;
1757
1758 // We have to compute it the hard way. Invoke the Knuth divide algorithm.
1759 uint64_t Remainder;
1760 divide(U.pVal, lhsWords, &RHS, 1, nullptr, &Remainder);
1761 return Remainder;
1762}
1763
1764APInt APInt::srem(const APInt &RHS) const {
1765 if (isNegative()) {
1766 if (RHS.isNegative())
1767 return -((-(*this)).urem(-RHS));
1768 return -((-(*this)).urem(RHS));
1769 }
1770 if (RHS.isNegative())
1771 return this->urem(-RHS);
1772 return this->urem(RHS);
1773}
1774
1775int64_t APInt::srem(int64_t RHS) const {
1776 if (isNegative()) {
1777 if (RHS < 0)
1778 return -((-(*this)).urem(-RHS));
1779 return -((-(*this)).urem(RHS));
1780 }
1781 if (RHS < 0)
1782 return this->urem(-RHS);
1783 return this->urem(RHS);
1784}
1785
1786void APInt::udivrem(const APInt &LHS, const APInt &RHS,
1787 APInt &Quotient, APInt &Remainder) {
1788 assert(LHS.BitWidth == RHS.BitWidth && "Bit widths must be the same")((LHS.BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("LHS.BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1788, __PRETTY_FUNCTION__))
;
1789 unsigned BitWidth = LHS.BitWidth;
1790
1791 // First, deal with the easy case
1792 if (LHS.isSingleWord()) {
1793 assert(RHS.U.VAL != 0 && "Divide by zero?")((RHS.U.VAL != 0 && "Divide by zero?") ? static_cast<
void> (0) : __assert_fail ("RHS.U.VAL != 0 && \"Divide by zero?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1793, __PRETTY_FUNCTION__))
;
1794 uint64_t QuotVal = LHS.U.VAL / RHS.U.VAL;
1795 uint64_t RemVal = LHS.U.VAL % RHS.U.VAL;
1796 Quotient = APInt(BitWidth, QuotVal);
1797 Remainder = APInt(BitWidth, RemVal);
1798 return;
1799 }
1800
1801 // Get some size facts about the dividend and divisor
1802 unsigned lhsWords = getNumWords(LHS.getActiveBits());
1803 unsigned rhsBits = RHS.getActiveBits();
1804 unsigned rhsWords = getNumWords(rhsBits);
1805 assert(rhsWords && "Performing divrem operation by zero ???")((rhsWords && "Performing divrem operation by zero ???"
) ? static_cast<void> (0) : __assert_fail ("rhsWords && \"Performing divrem operation by zero ???\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1805, __PRETTY_FUNCTION__))
;
1806
1807 // Check the degenerate cases
1808 if (lhsWords == 0) {
1809 Quotient = APInt(BitWidth, 0); // 0 / Y ===> 0
1810 Remainder = APInt(BitWidth, 0); // 0 % Y ===> 0
1811 return;
1812 }
1813
1814 if (rhsBits == 1) {
1815 Quotient = LHS; // X / 1 ===> X
1816 Remainder = APInt(BitWidth, 0); // X % 1 ===> 0
1817 }
1818
1819 if (lhsWords < rhsWords || LHS.ult(RHS)) {
1820 Remainder = LHS; // X % Y ===> X, iff X < Y
1821 Quotient = APInt(BitWidth, 0); // X / Y ===> 0, iff X < Y
1822 return;
1823 }
1824
1825 if (LHS == RHS) {
1826 Quotient = APInt(BitWidth, 1); // X / X ===> 1
1827 Remainder = APInt(BitWidth, 0); // X % X ===> 0;
1828 return;
1829 }
1830
1831 // Make sure there is enough space to hold the results.
1832 // NOTE: This assumes that reallocate won't affect any bits if it doesn't
1833 // change the size. This is necessary if Quotient or Remainder is aliased
1834 // with LHS or RHS.
1835 Quotient.reallocate(BitWidth);
1836 Remainder.reallocate(BitWidth);
1837
1838 if (lhsWords == 1) { // rhsWords is 1 if lhsWords is 1.
1839 // There is only one word to consider so use the native versions.
1840 uint64_t lhsValue = LHS.U.pVal[0];
1841 uint64_t rhsValue = RHS.U.pVal[0];
1842 Quotient = lhsValue / rhsValue;
1843 Remainder = lhsValue % rhsValue;
1844 return;
1845 }
1846
1847 // Okay, lets do it the long way
1848 divide(LHS.U.pVal, lhsWords, RHS.U.pVal, rhsWords, Quotient.U.pVal,
1849 Remainder.U.pVal);
1850 // Clear the rest of the Quotient and Remainder.
1851 std::memset(Quotient.U.pVal + lhsWords, 0,
1852 (getNumWords(BitWidth) - lhsWords) * APINT_WORD_SIZE);
1853 std::memset(Remainder.U.pVal + rhsWords, 0,
1854 (getNumWords(BitWidth) - rhsWords) * APINT_WORD_SIZE);
1855}
1856
1857void APInt::udivrem(const APInt &LHS, uint64_t RHS, APInt &Quotient,
1858 uint64_t &Remainder) {
1859 assert(RHS != 0 && "Divide by zero?")((RHS != 0 && "Divide by zero?") ? static_cast<void
> (0) : __assert_fail ("RHS != 0 && \"Divide by zero?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 1859, __PRETTY_FUNCTION__))
;
1860 unsigned BitWidth = LHS.BitWidth;
1861
1862 // First, deal with the easy case
1863 if (LHS.isSingleWord()) {
1864 uint64_t QuotVal = LHS.U.VAL / RHS;
1865 Remainder = LHS.U.VAL % RHS;
1866 Quotient = APInt(BitWidth, QuotVal);
1867 return;
1868 }
1869
1870 // Get some size facts about the dividend and divisor
1871 unsigned lhsWords = getNumWords(LHS.getActiveBits());
1872
1873 // Check the degenerate cases
1874 if (lhsWords == 0) {
1875 Quotient = APInt(BitWidth, 0); // 0 / Y ===> 0
1876 Remainder = 0; // 0 % Y ===> 0
1877 return;
1878 }
1879
1880 if (RHS == 1) {
1881 Quotient = LHS; // X / 1 ===> X
1882 Remainder = 0; // X % 1 ===> 0
1883 return;
1884 }
1885
1886 if (LHS.ult(RHS)) {
1887 Remainder = LHS.getZExtValue(); // X % Y ===> X, iff X < Y
1888 Quotient = APInt(BitWidth, 0); // X / Y ===> 0, iff X < Y
1889 return;
1890 }
1891
1892 if (LHS == RHS) {
1893 Quotient = APInt(BitWidth, 1); // X / X ===> 1
1894 Remainder = 0; // X % X ===> 0;
1895 return;
1896 }
1897
1898 // Make sure there is enough space to hold the results.
1899 // NOTE: This assumes that reallocate won't affect any bits if it doesn't
1900 // change the size. This is necessary if Quotient is aliased with LHS.
1901 Quotient.reallocate(BitWidth);
1902
1903 if (lhsWords == 1) { // rhsWords is 1 if lhsWords is 1.
1904 // There is only one word to consider so use the native versions.
1905 uint64_t lhsValue = LHS.U.pVal[0];
1906 Quotient = lhsValue / RHS;
1907 Remainder = lhsValue % RHS;
1908 return;
1909 }
1910
1911 // Okay, lets do it the long way
1912 divide(LHS.U.pVal, lhsWords, &RHS, 1, Quotient.U.pVal, &Remainder);
1913 // Clear the rest of the Quotient.
1914 std::memset(Quotient.U.pVal + lhsWords, 0,
1915 (getNumWords(BitWidth) - lhsWords) * APINT_WORD_SIZE);
1916}
1917
1918void APInt::sdivrem(const APInt &LHS, const APInt &RHS,
1919 APInt &Quotient, APInt &Remainder) {
1920 if (LHS.isNegative()) {
1921 if (RHS.isNegative())
1922 APInt::udivrem(-LHS, -RHS, Quotient, Remainder);
1923 else {
1924 APInt::udivrem(-LHS, RHS, Quotient, Remainder);
1925 Quotient.negate();
1926 }
1927 Remainder.negate();
1928 } else if (RHS.isNegative()) {
1929 APInt::udivrem(LHS, -RHS, Quotient, Remainder);
1930 Quotient.negate();
1931 } else {
1932 APInt::udivrem(LHS, RHS, Quotient, Remainder);
1933 }
1934}
1935
1936void APInt::sdivrem(const APInt &LHS, int64_t RHS,
1937 APInt &Quotient, int64_t &Remainder) {
1938 uint64_t R = Remainder;
1939 if (LHS.isNegative()) {
1940 if (RHS < 0)
1941 APInt::udivrem(-LHS, -RHS, Quotient, R);
1942 else {
1943 APInt::udivrem(-LHS, RHS, Quotient, R);
1944 Quotient.negate();
1945 }
1946 R = -R;
1947 } else if (RHS < 0) {
1948 APInt::udivrem(LHS, -RHS, Quotient, R);
1949 Quotient.negate();
1950 } else {
1951 APInt::udivrem(LHS, RHS, Quotient, R);
1952 }
1953 Remainder = R;
1954}
1955
1956APInt APInt::sadd_ov(const APInt &RHS, bool &Overflow) const {
1957 APInt Res = *this+RHS;
1958 Overflow = isNonNegative() == RHS.isNonNegative() &&
1959 Res.isNonNegative() != isNonNegative();
1960 return Res;
1961}
1962
1963APInt APInt::uadd_ov(const APInt &RHS, bool &Overflow) const {
1964 APInt Res = *this+RHS;
1965 Overflow = Res.ult(RHS);
1966 return Res;
1967}
1968
1969APInt APInt::ssub_ov(const APInt &RHS, bool &Overflow) const {
1970 APInt Res = *this - RHS;
1971 Overflow = isNonNegative() != RHS.isNonNegative() &&
1972 Res.isNonNegative() != isNonNegative();
1973 return Res;
1974}
1975
1976APInt APInt::usub_ov(const APInt &RHS, bool &Overflow) const {
1977 APInt Res = *this-RHS;
1978 Overflow = Res.ugt(*this);
1979 return Res;
1980}
1981
1982APInt APInt::sdiv_ov(const APInt &RHS, bool &Overflow) const {
1983 // MININT/-1 --> overflow.
1984 Overflow = isMinSignedValue() && RHS.isAllOnesValue();
1985 return sdiv(RHS);
1986}
1987
1988APInt APInt::smul_ov(const APInt &RHS, bool &Overflow) const {
1989 APInt Res = *this * RHS;
1990
1991 if (*this != 0 && RHS != 0)
1992 Overflow = Res.sdiv(RHS) != *this || Res.sdiv(*this) != RHS;
1993 else
1994 Overflow = false;
1995 return Res;
1996}
1997
1998APInt APInt::umul_ov(const APInt &RHS, bool &Overflow) const {
1999 if (countLeadingZeros() + RHS.countLeadingZeros() + 2 <= BitWidth) {
2000 Overflow = true;
2001 return *this * RHS;
2002 }
2003
2004 APInt Res = lshr(1) * RHS;
2005 Overflow = Res.isNegative();
2006 Res <<= 1;
2007 if ((*this)[0]) {
2008 Res += RHS;
2009 if (Res.ult(RHS))
2010 Overflow = true;
2011 }
2012 return Res;
2013}
2014
2015APInt APInt::sshl_ov(const APInt &ShAmt, bool &Overflow) const {
2016 Overflow = ShAmt.uge(getBitWidth());
2017 if (Overflow)
2018 return APInt(BitWidth, 0);
2019
2020 if (isNonNegative()) // Don't allow sign change.
2021 Overflow = ShAmt.uge(countLeadingZeros());
2022 else
2023 Overflow = ShAmt.uge(countLeadingOnes());
2024
2025 return *this << ShAmt;
2026}
2027
2028APInt APInt::ushl_ov(const APInt &ShAmt, bool &Overflow) const {
2029 Overflow = ShAmt.uge(getBitWidth());
2030 if (Overflow)
2031 return APInt(BitWidth, 0);
2032
2033 Overflow = ShAmt.ugt(countLeadingZeros());
2034
2035 return *this << ShAmt;
2036}
2037
2038APInt APInt::sadd_sat(const APInt &RHS) const {
2039 bool Overflow;
2040 APInt Res = sadd_ov(RHS, Overflow);
2041 if (!Overflow)
2042 return Res;
2043
2044 return isNegative() ? APInt::getSignedMinValue(BitWidth)
2045 : APInt::getSignedMaxValue(BitWidth);
2046}
2047
2048APInt APInt::uadd_sat(const APInt &RHS) const {
2049 bool Overflow;
2050 APInt Res = uadd_ov(RHS, Overflow);
2051 if (!Overflow)
2052 return Res;
2053
2054 return APInt::getMaxValue(BitWidth);
2055}
2056
2057APInt APInt::ssub_sat(const APInt &RHS) const {
2058 bool Overflow;
2059 APInt Res = ssub_ov(RHS, Overflow);
2060 if (!Overflow)
2061 return Res;
2062
2063 return isNegative() ? APInt::getSignedMinValue(BitWidth)
2064 : APInt::getSignedMaxValue(BitWidth);
2065}
2066
2067APInt APInt::usub_sat(const APInt &RHS) const {
2068 bool Overflow;
2069 APInt Res = usub_ov(RHS, Overflow);
2070 if (!Overflow)
2071 return Res;
2072
2073 return APInt(BitWidth, 0);
2074}
2075
2076APInt APInt::smul_sat(const APInt &RHS) const {
2077 bool Overflow;
2078 APInt Res = smul_ov(RHS, Overflow);
2079 if (!Overflow)
2080 return Res;
2081
2082 // The result is negative if one and only one of inputs is negative.
2083 bool ResIsNegative = isNegative() ^ RHS.isNegative();
2084
2085 return ResIsNegative ? APInt::getSignedMinValue(BitWidth)
2086 : APInt::getSignedMaxValue(BitWidth);
2087}
2088
2089APInt APInt::umul_sat(const APInt &RHS) const {
2090 bool Overflow;
2091 APInt Res = umul_ov(RHS, Overflow);
2092 if (!Overflow)
2093 return Res;
2094
2095 return APInt::getMaxValue(BitWidth);
2096}
2097
2098APInt APInt::sshl_sat(const APInt &RHS) const {
2099 bool Overflow;
2100 APInt Res = sshl_ov(RHS, Overflow);
2101 if (!Overflow)
2102 return Res;
2103
2104 return isNegative() ? APInt::getSignedMinValue(BitWidth)
2105 : APInt::getSignedMaxValue(BitWidth);
2106}
2107
2108APInt APInt::ushl_sat(const APInt &RHS) const {
2109 bool Overflow;
2110 APInt Res = ushl_ov(RHS, Overflow);
2111 if (!Overflow)
2112 return Res;
2113
2114 return APInt::getMaxValue(BitWidth);
2115}
2116
2117void APInt::fromString(unsigned numbits, StringRef str, uint8_t radix) {
2118 // Check our assumptions here
2119 assert(!str.empty() && "Invalid string length")((!str.empty() && "Invalid string length") ? static_cast
<void> (0) : __assert_fail ("!str.empty() && \"Invalid string length\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2119, __PRETTY_FUNCTION__))
;
2120 assert((radix == 10 || radix == 8 || radix == 16 || radix == 2 ||(((radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix
== 36) && "Radix should be 2, 8, 10, 16, or 36!") ? static_cast
<void> (0) : __assert_fail ("(radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix == 36) && \"Radix should be 2, 8, 10, 16, or 36!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2122, __PRETTY_FUNCTION__))
2121 radix == 36) &&(((radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix
== 36) && "Radix should be 2, 8, 10, 16, or 36!") ? static_cast
<void> (0) : __assert_fail ("(radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix == 36) && \"Radix should be 2, 8, 10, 16, or 36!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2122, __PRETTY_FUNCTION__))
2122 "Radix should be 2, 8, 10, 16, or 36!")(((radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix
== 36) && "Radix should be 2, 8, 10, 16, or 36!") ? static_cast
<void> (0) : __assert_fail ("(radix == 10 || radix == 8 || radix == 16 || radix == 2 || radix == 36) && \"Radix should be 2, 8, 10, 16, or 36!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2122, __PRETTY_FUNCTION__))
;
2123
2124 StringRef::iterator p = str.begin();
2125 size_t slen = str.size();
2126 bool isNeg = *p == '-';
2127 if (*p == '-' || *p == '+') {
2128 p++;
2129 slen--;
2130 assert(slen && "String is only a sign, needs a value.")((slen && "String is only a sign, needs a value.") ? static_cast
<void> (0) : __assert_fail ("slen && \"String is only a sign, needs a value.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2130, __PRETTY_FUNCTION__))
;
2131 }
2132 assert((slen <= numbits || radix != 2) && "Insufficient bit width")(((slen <= numbits || radix != 2) && "Insufficient bit width"
) ? static_cast<void> (0) : __assert_fail ("(slen <= numbits || radix != 2) && \"Insufficient bit width\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2132, __PRETTY_FUNCTION__))
;
2133 assert(((slen-1)*3 <= numbits || radix != 8) && "Insufficient bit width")((((slen-1)*3 <= numbits || radix != 8) && "Insufficient bit width"
) ? static_cast<void> (0) : __assert_fail ("((slen-1)*3 <= numbits || radix != 8) && \"Insufficient bit width\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2133, __PRETTY_FUNCTION__))
;
2134 assert(((slen-1)*4 <= numbits || radix != 16) && "Insufficient bit width")((((slen-1)*4 <= numbits || radix != 16) && "Insufficient bit width"
) ? static_cast<void> (0) : __assert_fail ("((slen-1)*4 <= numbits || radix != 16) && \"Insufficient bit width\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2134, __PRETTY_FUNCTION__))
;
2135 assert((((slen-1)*64)/22 <= numbits || radix != 10) &&(((((slen-1)*64)/22 <= numbits || radix != 10) && "Insufficient bit width"
) ? static_cast<void> (0) : __assert_fail ("(((slen-1)*64)/22 <= numbits || radix != 10) && \"Insufficient bit width\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2136, __PRETTY_FUNCTION__))
2136 "Insufficient bit width")(((((slen-1)*64)/22 <= numbits || radix != 10) && "Insufficient bit width"
) ? static_cast<void> (0) : __assert_fail ("(((slen-1)*64)/22 <= numbits || radix != 10) && \"Insufficient bit width\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2136, __PRETTY_FUNCTION__))
;
2137
2138 // Allocate memory if needed
2139 if (isSingleWord())
2140 U.VAL = 0;
2141 else
2142 U.pVal = getClearedMemory(getNumWords());
2143
2144 // Figure out if we can shift instead of multiply
2145 unsigned shift = (radix == 16 ? 4 : radix == 8 ? 3 : radix == 2 ? 1 : 0);
2146
2147 // Enter digit traversal loop
2148 for (StringRef::iterator e = str.end(); p != e; ++p) {
2149 unsigned digit = getDigit(*p, radix);
2150 assert(digit < radix && "Invalid character in digit string")((digit < radix && "Invalid character in digit string"
) ? static_cast<void> (0) : __assert_fail ("digit < radix && \"Invalid character in digit string\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2150, __PRETTY_FUNCTION__))
;
2151
2152 // Shift or multiply the value by the radix
2153 if (slen > 1) {
2154 if (shift)
2155 *this <<= shift;
2156 else
2157 *this *= radix;
2158 }
2159
2160 // Add in the digit we just interpreted
2161 *this += digit;
2162 }
2163 // If its negative, put it in two's complement form
2164 if (isNeg)
2165 this->negate();
2166}
2167
2168void APInt::toString(SmallVectorImpl<char> &Str, unsigned Radix,
2169 bool Signed, bool formatAsCLiteral) const {
2170 assert((Radix == 10 || Radix == 8 || Radix == 16 || Radix == 2 ||(((Radix == 10 || Radix == 8 || Radix == 16 || Radix == 2 || Radix
== 36) && "Radix should be 2, 8, 10, 16, or 36!") ? static_cast
<void> (0) : __assert_fail ("(Radix == 10 || Radix == 8 || Radix == 16 || Radix == 2 || Radix == 36) && \"Radix should be 2, 8, 10, 16, or 36!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2172, __PRETTY_FUNCTION__))
2171 Radix == 36) &&(((Radix == 10 || Radix == 8 || Radix == 16 || Radix == 2 || Radix
== 36) && "Radix should be 2, 8, 10, 16, or 36!") ? static_cast
<void> (0) : __assert_fail ("(Radix == 10 || Radix == 8 || Radix == 16 || Radix == 2 || Radix == 36) && \"Radix should be 2, 8, 10, 16, or 36!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2172, __PRETTY_FUNCTION__))
2172 "Radix should be 2, 8, 10, 16, or 36!")(((Radix == 10 || Radix == 8 || Radix == 16 || Radix == 2 || Radix
== 36) && "Radix should be 2, 8, 10, 16, or 36!") ? static_cast
<void> (0) : __assert_fail ("(Radix == 10 || Radix == 8 || Radix == 16 || Radix == 2 || Radix == 36) && \"Radix should be 2, 8, 10, 16, or 36!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2172, __PRETTY_FUNCTION__))
;
2173
2174 const char *Prefix = "";
2175 if (formatAsCLiteral) {
2176 switch (Radix) {
2177 case 2:
2178 // Binary literals are a non-standard extension added in gcc 4.3:
2179 // http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Binary-constants.html
2180 Prefix = "0b";
2181 break;
2182 case 8:
2183 Prefix = "0";
2184 break;
2185 case 10:
2186 break; // No prefix
2187 case 16:
2188 Prefix = "0x";
2189 break;
2190 default:
2191 llvm_unreachable("Invalid radix!")::llvm::llvm_unreachable_internal("Invalid radix!", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2191)
;
2192 }
2193 }
2194
2195 // First, check for a zero value and just short circuit the logic below.
2196 if (*this == 0) {
2197 while (*Prefix) {
2198 Str.push_back(*Prefix);
2199 ++Prefix;
2200 };
2201 Str.push_back('0');
2202 return;
2203 }
2204
2205 static const char Digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
2206
2207 if (isSingleWord()) {
2208 char Buffer[65];
2209 char *BufPtr = std::end(Buffer);
2210
2211 uint64_t N;
2212 if (!Signed) {
2213 N = getZExtValue();
2214 } else {
2215 int64_t I = getSExtValue();
2216 if (I >= 0) {
2217 N = I;
2218 } else {
2219 Str.push_back('-');
2220 N = -(uint64_t)I;
2221 }
2222 }
2223
2224 while (*Prefix) {
2225 Str.push_back(*Prefix);
2226 ++Prefix;
2227 };
2228
2229 while (N) {
2230 *--BufPtr = Digits[N % Radix];
2231 N /= Radix;
2232 }
2233 Str.append(BufPtr, std::end(Buffer));
2234 return;
2235 }
2236
2237 APInt Tmp(*this);
2238
2239 if (Signed && isNegative()) {
2240 // They want to print the signed version and it is a negative value
2241 // Flip the bits and add one to turn it into the equivalent positive
2242 // value and put a '-' in the result.
2243 Tmp.negate();
2244 Str.push_back('-');
2245 }
2246
2247 while (*Prefix) {
2248 Str.push_back(*Prefix);
2249 ++Prefix;
2250 };
2251
2252 // We insert the digits backward, then reverse them to get the right order.
2253 unsigned StartDig = Str.size();
2254
2255 // For the 2, 8 and 16 bit cases, we can just shift instead of divide
2256 // because the number of bits per digit (1, 3 and 4 respectively) divides
2257 // equally. We just shift until the value is zero.
2258 if (Radix == 2 || Radix == 8 || Radix == 16) {
2259 // Just shift tmp right for each digit width until it becomes zero
2260 unsigned ShiftAmt = (Radix == 16 ? 4 : (Radix == 8 ? 3 : 1));
2261 unsigned MaskAmt = Radix - 1;
2262
2263 while (Tmp.getBoolValue()) {
2264 unsigned Digit = unsigned(Tmp.getRawData()[0]) & MaskAmt;
2265 Str.push_back(Digits[Digit]);
2266 Tmp.lshrInPlace(ShiftAmt);
2267 }
2268 } else {
2269 while (Tmp.getBoolValue()) {
2270 uint64_t Digit;
2271 udivrem(Tmp, Radix, Tmp, Digit);
2272 assert(Digit < Radix && "divide failed")((Digit < Radix && "divide failed") ? static_cast<
void> (0) : __assert_fail ("Digit < Radix && \"divide failed\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2272, __PRETTY_FUNCTION__))
;
2273 Str.push_back(Digits[Digit]);
2274 }
2275 }
2276
2277 // Reverse the digits before returning.
2278 std::reverse(Str.begin()+StartDig, Str.end());
2279}
2280
2281/// Returns the APInt as a std::string. Note that this is an inefficient method.
2282/// It is better to pass in a SmallVector/SmallString to the methods above.
2283std::string APInt::toString(unsigned Radix = 10, bool Signed = true) const {
2284 SmallString<40> S;
2285 toString(S, Radix, Signed, /* formatAsCLiteral = */false);
2286 return S.str();
2287}
2288
2289#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
2290LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void APInt::dump() const {
2291 SmallString<40> S, U;
2292 this->toStringUnsigned(U);
2293 this->toStringSigned(S);
2294 dbgs() << "APInt(" << BitWidth << "b, "
2295 << U << "u " << S << "s)\n";
2296}
2297#endif
2298
2299void APInt::print(raw_ostream &OS, bool isSigned) const {
2300 SmallString<40> S;
2301 this->toString(S, 10, isSigned, /* formatAsCLiteral = */false);
2302 OS << S;
2303}
2304
2305// This implements a variety of operations on a representation of
2306// arbitrary precision, two's-complement, bignum integer values.
2307
2308// Assumed by lowHalf, highHalf, partMSB and partLSB. A fairly safe
2309// and unrestricting assumption.
2310static_assert(APInt::APINT_BITS_PER_WORD % 2 == 0,
2311 "Part width must be divisible by 2!");
2312
2313/* Some handy functions local to this file. */
2314
2315/* Returns the integer part with the least significant BITS set.
2316 BITS cannot be zero. */
2317static inline APInt::WordType lowBitMask(unsigned bits) {
2318 assert(bits != 0 && bits <= APInt::APINT_BITS_PER_WORD)((bits != 0 && bits <= APInt::APINT_BITS_PER_WORD)
? static_cast<void> (0) : __assert_fail ("bits != 0 && bits <= APInt::APINT_BITS_PER_WORD"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2318, __PRETTY_FUNCTION__))
;
2319
2320 return ~(APInt::WordType) 0 >> (APInt::APINT_BITS_PER_WORD - bits);
2321}
2322
2323/* Returns the value of the lower half of PART. */
2324static inline APInt::WordType lowHalf(APInt::WordType part) {
2325 return part & lowBitMask(APInt::APINT_BITS_PER_WORD / 2);
2326}
2327
2328/* Returns the value of the upper half of PART. */
2329static inline APInt::WordType highHalf(APInt::WordType part) {
2330 return part >> (APInt::APINT_BITS_PER_WORD / 2);
2331}
2332
2333/* Returns the bit number of the most significant set bit of a part.
2334 If the input number has no bits set -1U is returned. */
2335static unsigned partMSB(APInt::WordType value) {
2336 return findLastSet(value, ZB_Max);
2337}
2338
2339/* Returns the bit number of the least significant set bit of a
2340 part. If the input number has no bits set -1U is returned. */
2341static unsigned partLSB(APInt::WordType value) {
2342 return findFirstSet(value, ZB_Max);
2343}
2344
2345/* Sets the least significant part of a bignum to the input value, and
2346 zeroes out higher parts. */
2347void APInt::tcSet(WordType *dst, WordType part, unsigned parts) {
2348 assert(parts > 0)((parts > 0) ? static_cast<void> (0) : __assert_fail
("parts > 0", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2348, __PRETTY_FUNCTION__))
;
2349
2350 dst[0] = part;
2351 for (unsigned i = 1; i < parts; i++)
2352 dst[i] = 0;
2353}
2354
2355/* Assign one bignum to another. */
2356void APInt::tcAssign(WordType *dst, const WordType *src, unsigned parts) {
2357 for (unsigned i = 0; i < parts; i++)
2358 dst[i] = src[i];
2359}
2360
2361/* Returns true if a bignum is zero, false otherwise. */
2362bool APInt::tcIsZero(const WordType *src, unsigned parts) {
2363 for (unsigned i = 0; i < parts; i++)
2364 if (src[i])
2365 return false;
2366
2367 return true;
2368}
2369
2370/* Extract the given bit of a bignum; returns 0 or 1. */
2371int APInt::tcExtractBit(const WordType *parts, unsigned bit) {
2372 return (parts[whichWord(bit)] & maskBit(bit)) != 0;
2373}
2374
2375/* Set the given bit of a bignum. */
2376void APInt::tcSetBit(WordType *parts, unsigned bit) {
2377 parts[whichWord(bit)] |= maskBit(bit);
2378}
2379
2380/* Clears the given bit of a bignum. */
2381void APInt::tcClearBit(WordType *parts, unsigned bit) {
2382 parts[whichWord(bit)] &= ~maskBit(bit);
2383}
2384
2385/* Returns the bit number of the least significant set bit of a
2386 number. If the input number has no bits set -1U is returned. */
2387unsigned APInt::tcLSB(const WordType *parts, unsigned n) {
2388 for (unsigned i = 0; i < n; i++) {
2389 if (parts[i] != 0) {
2390 unsigned lsb = partLSB(parts[i]);
2391
2392 return lsb + i * APINT_BITS_PER_WORD;
2393 }
2394 }
2395
2396 return -1U;
2397}
2398
2399/* Returns the bit number of the most significant set bit of a number.
2400 If the input number has no bits set -1U is returned. */
2401unsigned APInt::tcMSB(const WordType *parts, unsigned n) {
2402 do {
2403 --n;
2404
2405 if (parts[n] != 0) {
2406 unsigned msb = partMSB(parts[n]);
2407
2408 return msb + n * APINT_BITS_PER_WORD;
2409 }
2410 } while (n);
2411
2412 return -1U;
2413}
2414
2415/* Copy the bit vector of width srcBITS from SRC, starting at bit
2416 srcLSB, to DST, of dstCOUNT parts, such that the bit srcLSB becomes
2417 the least significant bit of DST. All high bits above srcBITS in
2418 DST are zero-filled. */
2419void
2420APInt::tcExtract(WordType *dst, unsigned dstCount, const WordType *src,
2421 unsigned srcBits, unsigned srcLSB) {
2422 unsigned dstParts = (srcBits + APINT_BITS_PER_WORD - 1) / APINT_BITS_PER_WORD;
2423 assert(dstParts <= dstCount)((dstParts <= dstCount) ? static_cast<void> (0) : __assert_fail
("dstParts <= dstCount", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2423, __PRETTY_FUNCTION__))
;
2424
2425 unsigned firstSrcPart = srcLSB / APINT_BITS_PER_WORD;
2426 tcAssign (dst, src + firstSrcPart, dstParts);
2427
2428 unsigned shift = srcLSB % APINT_BITS_PER_WORD;
2429 tcShiftRight (dst, dstParts, shift);
2430
2431 /* We now have (dstParts * APINT_BITS_PER_WORD - shift) bits from SRC
2432 in DST. If this is less that srcBits, append the rest, else
2433 clear the high bits. */
2434 unsigned n = dstParts * APINT_BITS_PER_WORD - shift;
2435 if (n < srcBits) {
2436 WordType mask = lowBitMask (srcBits - n);
2437 dst[dstParts - 1] |= ((src[firstSrcPart + dstParts] & mask)
2438 << n % APINT_BITS_PER_WORD);
2439 } else if (n > srcBits) {
2440 if (srcBits % APINT_BITS_PER_WORD)
2441 dst[dstParts - 1] &= lowBitMask (srcBits % APINT_BITS_PER_WORD);
2442 }
2443
2444 /* Clear high parts. */
2445 while (dstParts < dstCount)
2446 dst[dstParts++] = 0;
2447}
2448
2449/* DST += RHS + C where C is zero or one. Returns the carry flag. */
2450APInt::WordType APInt::tcAdd(WordType *dst, const WordType *rhs,
2451 WordType c, unsigned parts) {
2452 assert(c <= 1)((c <= 1) ? static_cast<void> (0) : __assert_fail ("c <= 1"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2452, __PRETTY_FUNCTION__))
;
2453
2454 for (unsigned i = 0; i < parts; i++) {
2455 WordType l = dst[i];
2456 if (c) {
2457 dst[i] += rhs[i] + 1;
2458 c = (dst[i] <= l);
2459 } else {
2460 dst[i] += rhs[i];
2461 c = (dst[i] < l);
2462 }
2463 }
2464
2465 return c;
2466}
2467
2468/// This function adds a single "word" integer, src, to the multiple
2469/// "word" integer array, dst[]. dst[] is modified to reflect the addition and
2470/// 1 is returned if there is a carry out, otherwise 0 is returned.
2471/// @returns the carry of the addition.
2472APInt::WordType APInt::tcAddPart(WordType *dst, WordType src,
2473 unsigned parts) {
2474 for (unsigned i = 0; i < parts; ++i) {
2475 dst[i] += src;
2476 if (dst[i] >= src)
2477 return 0; // No need to carry so exit early.
2478 src = 1; // Carry one to next digit.
2479 }
2480
2481 return 1;
2482}
2483
2484/* DST -= RHS + C where C is zero or one. Returns the carry flag. */
2485APInt::WordType APInt::tcSubtract(WordType *dst, const WordType *rhs,
2486 WordType c, unsigned parts) {
2487 assert(c <= 1)((c <= 1) ? static_cast<void> (0) : __assert_fail ("c <= 1"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2487, __PRETTY_FUNCTION__))
;
2488
2489 for (unsigned i = 0; i < parts; i++) {
2490 WordType l = dst[i];
2491 if (c) {
2492 dst[i] -= rhs[i] + 1;
2493 c = (dst[i] >= l);
2494 } else {
2495 dst[i] -= rhs[i];
2496 c = (dst[i] > l);
2497 }
2498 }
2499
2500 return c;
2501}
2502
2503/// This function subtracts a single "word" (64-bit word), src, from
2504/// the multi-word integer array, dst[], propagating the borrowed 1 value until
2505/// no further borrowing is needed or it runs out of "words" in dst. The result
2506/// is 1 if "borrowing" exhausted the digits in dst, or 0 if dst was not
2507/// exhausted. In other words, if src > dst then this function returns 1,
2508/// otherwise 0.
2509/// @returns the borrow out of the subtraction
2510APInt::WordType APInt::tcSubtractPart(WordType *dst, WordType src,
2511 unsigned parts) {
2512 for (unsigned i = 0; i < parts; ++i) {
2513 WordType Dst = dst[i];
2514 dst[i] -= src;
2515 if (src <= Dst)
2516 return 0; // No need to borrow so exit early.
2517 src = 1; // We have to "borrow 1" from next "word"
2518 }
2519
2520 return 1;
2521}
2522
2523/* Negate a bignum in-place. */
2524void APInt::tcNegate(WordType *dst, unsigned parts) {
2525 tcComplement(dst, parts);
2526 tcIncrement(dst, parts);
2527}
2528
2529/* DST += SRC * MULTIPLIER + CARRY if add is true
2530 DST = SRC * MULTIPLIER + CARRY if add is false
2531
2532 Requires 0 <= DSTPARTS <= SRCPARTS + 1. If DST overlaps SRC
2533 they must start at the same point, i.e. DST == SRC.
2534
2535 If DSTPARTS == SRCPARTS + 1 no overflow occurs and zero is
2536 returned. Otherwise DST is filled with the least significant
2537 DSTPARTS parts of the result, and if all of the omitted higher
2538 parts were zero return zero, otherwise overflow occurred and
2539 return one. */
2540int APInt::tcMultiplyPart(WordType *dst, const WordType *src,
2541 WordType multiplier, WordType carry,
2542 unsigned srcParts, unsigned dstParts,
2543 bool add) {
2544 /* Otherwise our writes of DST kill our later reads of SRC. */
2545 assert(dst <= src || dst >= src + srcParts)((dst <= src || dst >= src + srcParts) ? static_cast<
void> (0) : __assert_fail ("dst <= src || dst >= src + srcParts"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2545, __PRETTY_FUNCTION__))
;
2546 assert(dstParts <= srcParts + 1)((dstParts <= srcParts + 1) ? static_cast<void> (0) :
__assert_fail ("dstParts <= srcParts + 1", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2546, __PRETTY_FUNCTION__))
;
2547
2548 /* N loops; minimum of dstParts and srcParts. */
2549 unsigned n = std::min(dstParts, srcParts);
2550
2551 for (unsigned i = 0; i < n; i++) {
2552 WordType low, mid, high, srcPart;
2553
2554 /* [ LOW, HIGH ] = MULTIPLIER * SRC[i] + DST[i] + CARRY.
2555
2556 This cannot overflow, because
2557
2558 (n - 1) * (n - 1) + 2 (n - 1) = (n - 1) * (n + 1)
2559
2560 which is less than n^2. */
2561
2562 srcPart = src[i];
2563
2564 if (multiplier == 0 || srcPart == 0) {
2565 low = carry;
2566 high = 0;
2567 } else {
2568 low = lowHalf(srcPart) * lowHalf(multiplier);
2569 high = highHalf(srcPart) * highHalf(multiplier);
2570
2571 mid = lowHalf(srcPart) * highHalf(multiplier);
2572 high += highHalf(mid);
2573 mid <<= APINT_BITS_PER_WORD / 2;
2574 if (low + mid < low)
2575 high++;
2576 low += mid;
2577
2578 mid = highHalf(srcPart) * lowHalf(multiplier);
2579 high += highHalf(mid);
2580 mid <<= APINT_BITS_PER_WORD / 2;
2581 if (low + mid < low)
2582 high++;
2583 low += mid;
2584
2585 /* Now add carry. */
2586 if (low + carry < low)
2587 high++;
2588 low += carry;
2589 }
2590
2591 if (add) {
2592 /* And now DST[i], and store the new low part there. */
2593 if (low + dst[i] < low)
2594 high++;
2595 dst[i] += low;
2596 } else
2597 dst[i] = low;
2598
2599 carry = high;
2600 }
2601
2602 if (srcParts < dstParts) {
2603 /* Full multiplication, there is no overflow. */
2604 assert(srcParts + 1 == dstParts)((srcParts + 1 == dstParts) ? static_cast<void> (0) : __assert_fail
("srcParts + 1 == dstParts", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2604, __PRETTY_FUNCTION__))
;
2605 dst[srcParts] = carry;
2606 return 0;
2607 }
2608
2609 /* We overflowed if there is carry. */
2610 if (carry)
2611 return 1;
2612
2613 /* We would overflow if any significant unwritten parts would be
2614 non-zero. This is true if any remaining src parts are non-zero
2615 and the multiplier is non-zero. */
2616 if (multiplier)
2617 for (unsigned i = dstParts; i < srcParts; i++)
2618 if (src[i])
2619 return 1;
2620
2621 /* We fitted in the narrow destination. */
2622 return 0;
2623}
2624
2625/* DST = LHS * RHS, where DST has the same width as the operands and
2626 is filled with the least significant parts of the result. Returns
2627 one if overflow occurred, otherwise zero. DST must be disjoint
2628 from both operands. */
2629int APInt::tcMultiply(WordType *dst, const WordType *lhs,
2630 const WordType *rhs, unsigned parts) {
2631 assert(dst != lhs && dst != rhs)((dst != lhs && dst != rhs) ? static_cast<void>
(0) : __assert_fail ("dst != lhs && dst != rhs", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2631, __PRETTY_FUNCTION__))
;
2632
2633 int overflow = 0;
2634 tcSet(dst, 0, parts);
2635
2636 for (unsigned i = 0; i < parts; i++)
2637 overflow |= tcMultiplyPart(&dst[i], lhs, rhs[i], 0, parts,
2638 parts - i, true);
2639
2640 return overflow;
2641}
2642
2643/// DST = LHS * RHS, where DST has width the sum of the widths of the
2644/// operands. No overflow occurs. DST must be disjoint from both operands.
2645void APInt::tcFullMultiply(WordType *dst, const WordType *lhs,
2646 const WordType *rhs, unsigned lhsParts,
2647 unsigned rhsParts) {
2648 /* Put the narrower number on the LHS for less loops below. */
2649 if (lhsParts > rhsParts)
2650 return tcFullMultiply (dst, rhs, lhs, rhsParts, lhsParts);
2651
2652 assert(dst != lhs && dst != rhs)((dst != lhs && dst != rhs) ? static_cast<void>
(0) : __assert_fail ("dst != lhs && dst != rhs", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2652, __PRETTY_FUNCTION__))
;
2653
2654 tcSet(dst, 0, rhsParts);
2655
2656 for (unsigned i = 0; i < lhsParts; i++)
2657 tcMultiplyPart(&dst[i], rhs, lhs[i], 0, rhsParts, rhsParts + 1, true);
2658}
2659
2660/* If RHS is zero LHS and REMAINDER are left unchanged, return one.
2661 Otherwise set LHS to LHS / RHS with the fractional part discarded,
2662 set REMAINDER to the remainder, return zero. i.e.
2663
2664 OLD_LHS = RHS * LHS + REMAINDER
2665
2666 SCRATCH is a bignum of the same size as the operands and result for
2667 use by the routine; its contents need not be initialized and are
2668 destroyed. LHS, REMAINDER and SCRATCH must be distinct.
2669*/
2670int APInt::tcDivide(WordType *lhs, const WordType *rhs,
2671 WordType *remainder, WordType *srhs,
2672 unsigned parts) {
2673 assert(lhs != remainder && lhs != srhs && remainder != srhs)((lhs != remainder && lhs != srhs && remainder
!= srhs) ? static_cast<void> (0) : __assert_fail ("lhs != remainder && lhs != srhs && remainder != srhs"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2673, __PRETTY_FUNCTION__))
;
2674
2675 unsigned shiftCount = tcMSB(rhs, parts) + 1;
2676 if (shiftCount == 0)
2677 return true;
2678
2679 shiftCount = parts * APINT_BITS_PER_WORD - shiftCount;
2680 unsigned n = shiftCount / APINT_BITS_PER_WORD;
2681 WordType mask = (WordType) 1 << (shiftCount % APINT_BITS_PER_WORD);
2682
2683 tcAssign(srhs, rhs, parts);
2684 tcShiftLeft(srhs, parts, shiftCount);
2685 tcAssign(remainder, lhs, parts);
2686 tcSet(lhs, 0, parts);
2687
2688 /* Loop, subtracting SRHS if REMAINDER is greater and adding that to
2689 the total. */
2690 for (;;) {
2691 int compare = tcCompare(remainder, srhs, parts);
2692 if (compare >= 0) {
2693 tcSubtract(remainder, srhs, 0, parts);
2694 lhs[n] |= mask;
2695 }
2696
2697 if (shiftCount == 0)
2698 break;
2699 shiftCount--;
2700 tcShiftRight(srhs, parts, 1);
2701 if ((mask >>= 1) == 0) {
2702 mask = (WordType) 1 << (APINT_BITS_PER_WORD - 1);
2703 n--;
2704 }
2705 }
2706
2707 return false;
2708}
2709
2710/// Shift a bignum left Cound bits in-place. Shifted in bits are zero. There are
2711/// no restrictions on Count.
2712void APInt::tcShiftLeft(WordType *Dst, unsigned Words, unsigned Count) {
2713 // Don't bother performing a no-op shift.
2714 if (!Count)
2715 return;
2716
2717 // WordShift is the inter-part shift; BitShift is the intra-part shift.
2718 unsigned WordShift = std::min(Count / APINT_BITS_PER_WORD, Words);
2719 unsigned BitShift = Count % APINT_BITS_PER_WORD;
2720
2721 // Fastpath for moving by whole words.
2722 if (BitShift == 0) {
2723 std::memmove(Dst + WordShift, Dst, (Words - WordShift) * APINT_WORD_SIZE);
2724 } else {
2725 while (Words-- > WordShift) {
2726 Dst[Words] = Dst[Words - WordShift] << BitShift;
2727 if (Words > WordShift)
2728 Dst[Words] |=
2729 Dst[Words - WordShift - 1] >> (APINT_BITS_PER_WORD - BitShift);
2730 }
2731 }
2732
2733 // Fill in the remainder with 0s.
2734 std::memset(Dst, 0, WordShift * APINT_WORD_SIZE);
2735}
2736
2737/// Shift a bignum right Count bits in-place. Shifted in bits are zero. There
2738/// are no restrictions on Count.
2739void APInt::tcShiftRight(WordType *Dst, unsigned Words, unsigned Count) {
2740 // Don't bother performing a no-op shift.
2741 if (!Count)
2742 return;
2743
2744 // WordShift is the inter-part shift; BitShift is the intra-part shift.
2745 unsigned WordShift = std::min(Count / APINT_BITS_PER_WORD, Words);
2746 unsigned BitShift = Count % APINT_BITS_PER_WORD;
2747
2748 unsigned WordsToMove = Words - WordShift;
2749 // Fastpath for moving by whole words.
2750 if (BitShift == 0) {
2751 std::memmove(Dst, Dst + WordShift, WordsToMove * APINT_WORD_SIZE);
2752 } else {
2753 for (unsigned i = 0; i != WordsToMove; ++i) {
2754 Dst[i] = Dst[i + WordShift] >> BitShift;
2755 if (i + 1 != WordsToMove)
2756 Dst[i] |= Dst[i + WordShift + 1] << (APINT_BITS_PER_WORD - BitShift);
2757 }
2758 }
2759
2760 // Fill in the remainder with 0s.
2761 std::memset(Dst + WordsToMove, 0, WordShift * APINT_WORD_SIZE);
2762}
2763
2764/* Bitwise and of two bignums. */
2765void APInt::tcAnd(WordType *dst, const WordType *rhs, unsigned parts) {
2766 for (unsigned i = 0; i < parts; i++)
2767 dst[i] &= rhs[i];
2768}
2769
2770/* Bitwise inclusive or of two bignums. */
2771void APInt::tcOr(WordType *dst, const WordType *rhs, unsigned parts) {
2772 for (unsigned i = 0; i < parts; i++)
2773 dst[i] |= rhs[i];
2774}
2775
2776/* Bitwise exclusive or of two bignums. */
2777void APInt::tcXor(WordType *dst, const WordType *rhs, unsigned parts) {
2778 for (unsigned i = 0; i < parts; i++)
2779 dst[i] ^= rhs[i];
2780}
2781
2782/* Complement a bignum in-place. */
2783void APInt::tcComplement(WordType *dst, unsigned parts) {
2784 for (unsigned i = 0; i < parts; i++)
2785 dst[i] = ~dst[i];
2786}
2787
2788/* Comparison (unsigned) of two bignums. */
2789int APInt::tcCompare(const WordType *lhs, const WordType *rhs,
2790 unsigned parts) {
2791 while (parts) {
2792 parts--;
2793 if (lhs[parts] != rhs[parts])
2794 return (lhs[parts] > rhs[parts]) ? 1 : -1;
2795 }
2796
2797 return 0;
2798}
2799
2800/* Set the least significant BITS bits of a bignum, clear the
2801 rest. */
2802void APInt::tcSetLeastSignificantBits(WordType *dst, unsigned parts,
2803 unsigned bits) {
2804 unsigned i = 0;
2805 while (bits > APINT_BITS_PER_WORD) {
2806 dst[i++] = ~(WordType) 0;
2807 bits -= APINT_BITS_PER_WORD;
2808 }
2809
2810 if (bits)
2811 dst[i++] = ~(WordType) 0 >> (APINT_BITS_PER_WORD - bits);
2812
2813 while (i < parts)
2814 dst[i++] = 0;
2815}
2816
2817APInt llvm::APIntOps::RoundingUDiv(const APInt &A, const APInt &B,
2818 APInt::Rounding RM) {
2819 // Currently udivrem always rounds down.
2820 switch (RM) {
2821 case APInt::Rounding::DOWN:
2822 case APInt::Rounding::TOWARD_ZERO:
2823 return A.udiv(B);
2824 case APInt::Rounding::UP: {
2825 APInt Quo, Rem;
2826 APInt::udivrem(A, B, Quo, Rem);
2827 if (Rem == 0)
2828 return Quo;
2829 return Quo + 1;
2830 }
2831 }
2832 llvm_unreachable("Unknown APInt::Rounding enum")::llvm::llvm_unreachable_internal("Unknown APInt::Rounding enum"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2832)
;
2833}
2834
2835APInt llvm::APIntOps::RoundingSDiv(const APInt &A, const APInt &B,
2836 APInt::Rounding RM) {
2837 switch (RM) {
2838 case APInt::Rounding::DOWN:
2839 case APInt::Rounding::UP: {
2840 APInt Quo, Rem;
2841 APInt::sdivrem(A, B, Quo, Rem);
2842 if (Rem == 0)
2843 return Quo;
2844 // This algorithm deals with arbitrary rounding mode used by sdivrem.
2845 // We want to check whether the non-integer part of the mathematical value
2846 // is negative or not. If the non-integer part is negative, we need to round
2847 // down from Quo; otherwise, if it's positive or 0, we return Quo, as it's
2848 // already rounded down.
2849 if (RM == APInt::Rounding::DOWN) {
2850 if (Rem.isNegative() != B.isNegative())
2851 return Quo - 1;
2852 return Quo;
2853 }
2854 if (Rem.isNegative() != B.isNegative())
2855 return Quo;
2856 return Quo + 1;
2857 }
2858 // Currently sdiv rounds towards zero.
2859 case APInt::Rounding::TOWARD_ZERO:
2860 return A.sdiv(B);
2861 }
2862 llvm_unreachable("Unknown APInt::Rounding enum")::llvm::llvm_unreachable_internal("Unknown APInt::Rounding enum"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2862)
;
2863}
2864
2865Optional<APInt>
2866llvm::APIntOps::SolveQuadraticEquationWrap(APInt A, APInt B, APInt C,
2867 unsigned RangeWidth) {
2868 unsigned CoeffWidth = A.getBitWidth();
2869 assert(CoeffWidth == B.getBitWidth() && CoeffWidth == C.getBitWidth())((CoeffWidth == B.getBitWidth() && CoeffWidth == C.getBitWidth
()) ? static_cast<void> (0) : __assert_fail ("CoeffWidth == B.getBitWidth() && CoeffWidth == C.getBitWidth()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2869, __PRETTY_FUNCTION__))
;
1
Assuming the condition is true
2
Assuming the condition is true
3
'?' condition is true
2870 assert(RangeWidth <= CoeffWidth &&((RangeWidth <= CoeffWidth && "Value range width should be less than coefficient width"
) ? static_cast<void> (0) : __assert_fail ("RangeWidth <= CoeffWidth && \"Value range width should be less than coefficient width\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2871, __PRETTY_FUNCTION__))
4
Assuming 'RangeWidth' is <= 'CoeffWidth'
5
'?' condition is true
2871 "Value range width should be less than coefficient width")((RangeWidth <= CoeffWidth && "Value range width should be less than coefficient width"
) ? static_cast<void> (0) : __assert_fail ("RangeWidth <= CoeffWidth && \"Value range width should be less than coefficient width\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2871, __PRETTY_FUNCTION__))
;
2872 assert(RangeWidth > 1 && "Value range bit width should be > 1")((RangeWidth > 1 && "Value range bit width should be > 1"
) ? static_cast<void> (0) : __assert_fail ("RangeWidth > 1 && \"Value range bit width should be > 1\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2872, __PRETTY_FUNCTION__))
;
6
Assuming 'RangeWidth' is > 1
7
'?' condition is true
2873
2874 LLVM_DEBUG(dbgs() << __func__ << ": solving " << A << "x^2 + " << Bdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("apint")) { dbgs() << __func__ << ": solving " <<
A << "x^2 + " << B << "x + " << C <<
", rw:" << RangeWidth << '\n'; } } while (false)
8
Assuming 'DebugFlag' is false
9
Loop condition is false. Exiting loop
2875 << "x + " << C << ", rw:" << RangeWidth << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("apint")) { dbgs() << __func__ << ": solving " <<
A << "x^2 + " << B << "x + " << C <<
", rw:" << RangeWidth << '\n'; } } while (false)
;
2876
2877 // Identify 0 as a (non)solution immediately.
2878 if (C.sextOrTrunc(RangeWidth).isNullValue() ) {
10
Taking false branch
2879 LLVM_DEBUG(dbgs() << __func__ << ": zero solution\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("apint")) { dbgs() << __func__ << ": zero solution\n"
; } } while (false)
;
2880 return APInt(CoeffWidth, 0);
2881 }
2882
2883 // The result of APInt arithmetic has the same bit width as the operands,
2884 // so it can actually lose high bits. A product of two n-bit integers needs
2885 // 2n-1 bits to represent the full value.
2886 // The operation done below (on quadratic coefficients) that can produce
2887 // the largest value is the evaluation of the equation during bisection,
2888 // which needs 3 times the bitwidth of the coefficient, so the total number
2889 // of required bits is 3n.
2890 //
2891 // The purpose of this extension is to simulate the set Z of all integers,
2892 // where n+1 > n for all n in Z. In Z it makes sense to talk about positive
2893 // and negative numbers (not so much in a modulo arithmetic). The method
2894 // used to solve the equation is based on the standard formula for real
2895 // numbers, and uses the concepts of "positive" and "negative" with their
2896 // usual meanings.
2897 CoeffWidth *= 3;
2898 A = A.sext(CoeffWidth);
2899 B = B.sext(CoeffWidth);
2900 C = C.sext(CoeffWidth);
2901
2902 // Make A > 0 for simplicity. Negate cannot overflow at this point because
2903 // the bit width has increased.
2904 if (A.isNegative()) {
11
Assuming the condition is false
12
Taking false branch
2905 A.negate();
2906 B.negate();
2907 C.negate();
2908 }
2909
2910 // Solving an equation q(x) = 0 with coefficients in modular arithmetic
2911 // is really solving a set of equations q(x) = kR for k = 0, 1, 2, ...,
2912 // and R = 2^BitWidth.
2913 // Since we're trying not only to find exact solutions, but also values
2914 // that "wrap around", such a set will always have a solution, i.e. an x
2915 // that satisfies at least one of the equations, or such that |q(x)|
2916 // exceeds kR, while |q(x-1)| for the same k does not.
2917 //
2918 // We need to find a value k, such that Ax^2 + Bx + C = kR will have a
2919 // positive solution n (in the above sense), and also such that the n
2920 // will be the least among all solutions corresponding to k = 0, 1, ...
2921 // (more precisely, the least element in the set
2922 // { n(k) | k is such that a solution n(k) exists }).
2923 //
2924 // Consider the parabola (over real numbers) that corresponds to the
2925 // quadratic equation. Since A > 0, the arms of the parabola will point
2926 // up. Picking different values of k will shift it up and down by R.
2927 //
2928 // We want to shift the parabola in such a way as to reduce the problem
2929 // of solving q(x) = kR to solving shifted_q(x) = 0.
2930 // (The interesting solutions are the ceilings of the real number
2931 // solutions.)
2932 APInt R = APInt::getOneBitSet(CoeffWidth, RangeWidth);
2933 APInt TwoA = 2 * A;
2934 APInt SqrB = B * B;
2935 bool PickLow;
2936
2937 auto RoundUp = [] (const APInt &V, const APInt &A) -> APInt {
2938 assert(A.isStrictlyPositive())((A.isStrictlyPositive()) ? static_cast<void> (0) : __assert_fail
("A.isStrictlyPositive()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2938, __PRETTY_FUNCTION__))
;
2939 APInt T = V.abs().urem(A);
2940 if (T.isNullValue())
2941 return V;
2942 return V.isNegative() ? V+T : V+(A-T);
2943 };
2944
2945 // The vertex of the parabola is at -B/2A, but since A > 0, it's negative
2946 // iff B is positive.
2947 if (B.isNonNegative()) {
13
Assuming the condition is true
14
Taking true branch
2948 // If B >= 0, the vertex it at a negative location (or at 0), so in
2949 // order to have a non-negative solution we need to pick k that makes
2950 // C-kR negative. To satisfy all the requirements for the solution
2951 // that we are looking for, it needs to be closest to 0 of all k.
2952 C = C.srem(R);
2953 if (C.isStrictlyPositive())
15
Taking false branch
2954 C -= R;
2955 // Pick the greater solution.
2956 PickLow = false;
2957 } else {
2958 // If B < 0, the vertex is at a positive location. For any solution
2959 // to exist, the discriminant must be non-negative. This means that
2960 // C-kR <= B^2/4A is a necessary condition for k, i.e. there is a
2961 // lower bound on values of k: kR >= C - B^2/4A.
2962 APInt LowkR = C - SqrB.udiv(2*TwoA); // udiv because all values > 0.
2963 // Round LowkR up (towards +inf) to the nearest kR.
2964 LowkR = RoundUp(LowkR, R);
2965
2966 // If there exists k meeting the condition above, and such that
2967 // C-kR > 0, there will be two positive real number solutions of
2968 // q(x) = kR. Out of all such values of k, pick the one that makes
2969 // C-kR closest to 0, (i.e. pick maximum k such that C-kR > 0).
2970 // In other words, find maximum k such that LowkR <= kR < C.
2971 if (C.sgt(LowkR)) {
2972 // If LowkR < C, then such a k is guaranteed to exist because
2973 // LowkR itself is a multiple of R.
2974 C -= -RoundUp(-C, R); // C = C - RoundDown(C, R)
2975 // Pick the smaller solution.
2976 PickLow = true;
2977 } else {
2978 // If C-kR < 0 for all potential k's, it means that one solution
2979 // will be negative, while the other will be positive. The positive
2980 // solution will shift towards 0 if the parabola is moved up.
2981 // Pick the kR closest to the lower bound (i.e. make C-kR closest
2982 // to 0, or in other words, out of all parabolas that have solutions,
2983 // pick the one that is the farthest "up").
2984 // Since LowkR is itself a multiple of R, simply take C-LowkR.
2985 C -= LowkR;
2986 // Pick the greater solution.
2987 PickLow = false;
2988 }
2989 }
2990
2991 LLVM_DEBUG
15.1
'DebugFlag' is false
15.1
'DebugFlag' is false
(dbgs() << __func__ << ": updated coefficients " << A << "x^2 + "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("apint")) { dbgs() << __func__ << ": updated coefficients "
<< A << "x^2 + " << B << "x + " <<
C << ", rw:" << RangeWidth << '\n'; } } while
(false)
16
Loop condition is false. Exiting loop
2992 << B << "x + " << C << ", rw:" << RangeWidth << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("apint")) { dbgs() << __func__ << ": updated coefficients "
<< A << "x^2 + " << B << "x + " <<
C << ", rw:" << RangeWidth << '\n'; } } while
(false)
;
2993
2994 APInt D = SqrB - 4*A*C;
2995 assert(D.isNonNegative() && "Negative discriminant")((D.isNonNegative() && "Negative discriminant") ? static_cast
<void> (0) : __assert_fail ("D.isNonNegative() && \"Negative discriminant\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 2995, __PRETTY_FUNCTION__))
;
17
Assuming the condition is true
18
'?' condition is true
2996 APInt SQ = D.sqrt();
19
Calling 'APInt::sqrt'
2997
2998 APInt Q = SQ * SQ;
2999 bool InexactSQ = Q != D;
3000 // The calculated SQ may actually be greater than the exact (non-integer)
3001 // value. If that's the case, decrement SQ to get a value that is lower.
3002 if (Q.sgt(D))
3003 SQ -= 1;
3004
3005 APInt X;
3006 APInt Rem;
3007
3008 // SQ is rounded down (i.e SQ * SQ <= D), so the roots may be inexact.
3009 // When using the quadratic formula directly, the calculated low root
3010 // may be greater than the exact one, since we would be subtracting SQ.
3011 // To make sure that the calculated root is not greater than the exact
3012 // one, subtract SQ+1 when calculating the low root (for inexact value
3013 // of SQ).
3014 if (PickLow)
3015 APInt::sdivrem(-B - (SQ+InexactSQ), TwoA, X, Rem);
3016 else
3017 APInt::sdivrem(-B + SQ, TwoA, X, Rem);
3018
3019 // The updated coefficients should be such that the (exact) solution is
3020 // positive. Since APInt division rounds towards 0, the calculated one
3021 // can be 0, but cannot be negative.
3022 assert(X.isNonNegative() && "Solution should be non-negative")((X.isNonNegative() && "Solution should be non-negative"
) ? static_cast<void> (0) : __assert_fail ("X.isNonNegative() && \"Solution should be non-negative\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 3022, __PRETTY_FUNCTION__))
;
3023
3024 if (!InexactSQ && Rem.isNullValue()) {
3025 LLVM_DEBUG(dbgs() << __func__ << ": solution (root): " << X << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("apint")) { dbgs() << __func__ << ": solution (root): "
<< X << '\n'; } } while (false)
;
3026 return X;
3027 }
3028
3029 assert((SQ*SQ).sle(D) && "SQ = |_sqrt(D)_|, so SQ*SQ <= D")(((SQ*SQ).sle(D) && "SQ = |_sqrt(D)_|, so SQ*SQ <= D"
) ? static_cast<void> (0) : __assert_fail ("(SQ*SQ).sle(D) && \"SQ = |_sqrt(D)_|, so SQ*SQ <= D\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 3029, __PRETTY_FUNCTION__))
;
3030 // The exact value of the square root of D should be between SQ and SQ+1.
3031 // This implies that the solution should be between that corresponding to
3032 // SQ (i.e. X) and that corresponding to SQ+1.
3033 //
3034 // The calculated X cannot be greater than the exact (real) solution.
3035 // Actually it must be strictly less than the exact solution, while
3036 // X+1 will be greater than or equal to it.
3037
3038 APInt VX = (A*X + B)*X + C;
3039 APInt VY = VX + TwoA*X + A + B;
3040 bool SignChange = VX.isNegative() != VY.isNegative() ||
3041 VX.isNullValue() != VY.isNullValue();
3042 // If the sign did not change between X and X+1, X is not a valid solution.
3043 // This could happen when the actual (exact) roots don't have an integer
3044 // between them, so they would both be contained between X and X+1.
3045 if (!SignChange) {
3046 LLVM_DEBUG(dbgs() << __func__ << ": no valid solution\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("apint")) { dbgs() << __func__ << ": no valid solution\n"
; } } while (false)
;
3047 return None;
3048 }
3049
3050 X += 1;
3051 LLVM_DEBUG(dbgs() << __func__ << ": solution (wrap): " << X << '\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType
("apint")) { dbgs() << __func__ << ": solution (wrap): "
<< X << '\n'; } } while (false)
;
3052 return X;
3053}
3054
3055Optional<unsigned>
3056llvm::APIntOps::GetMostSignificantDifferentBit(const APInt &A, const APInt &B) {
3057 assert(A.getBitWidth() == B.getBitWidth() && "Must have the same bitwidth")((A.getBitWidth() == B.getBitWidth() && "Must have the same bitwidth"
) ? static_cast<void> (0) : __assert_fail ("A.getBitWidth() == B.getBitWidth() && \"Must have the same bitwidth\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 3057, __PRETTY_FUNCTION__))
;
3058 if (A == B)
3059 return llvm::None;
3060 return A.getBitWidth() - ((A ^ B).countLeadingZeros() + 1);
3061}
3062
3063/// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
3064/// with the integer held in IntVal.
3065void llvm::StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
3066 unsigned StoreBytes) {
3067 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!")(((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!"
) ? static_cast<void> (0) : __assert_fail ("(IntVal.getBitWidth()+7)/8 >= StoreBytes && \"Integer too small!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 3067, __PRETTY_FUNCTION__))
;
3068 const uint8_t *Src = (const uint8_t *)IntVal.getRawData();
3069
3070 if (sys::IsLittleEndianHost) {
3071 // Little-endian host - the source is ordered from LSB to MSB. Order the
3072 // destination from LSB to MSB: Do a straight copy.
3073 memcpy(Dst, Src, StoreBytes);
3074 } else {
3075 // Big-endian host - the source is an array of 64 bit words ordered from
3076 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
3077 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
3078 while (StoreBytes > sizeof(uint64_t)) {
3079 StoreBytes -= sizeof(uint64_t);
3080 // May not be aligned so use memcpy.
3081 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
3082 Src += sizeof(uint64_t);
3083 }
3084
3085 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
3086 }
3087}
3088
3089/// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
3090/// from Src into IntVal, which is assumed to be wide enough and to hold zero.
3091void llvm::LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
3092 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!")(((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!"
) ? static_cast<void> (0) : __assert_fail ("(IntVal.getBitWidth()+7)/8 >= LoadBytes && \"Integer too small!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/lib/Support/APInt.cpp"
, 3092, __PRETTY_FUNCTION__))
;
3093 uint8_t *Dst = reinterpret_cast<uint8_t *>(
3094 const_cast<uint64_t *>(IntVal.getRawData()));
3095
3096 if (sys::IsLittleEndianHost)
3097 // Little-endian host - the destination must be ordered from LSB to MSB.
3098 // The source is ordered from LSB to MSB: Do a straight copy.
3099 memcpy(Dst, Src, LoadBytes);
3100 else {
3101 // Big-endian - the destination is an array of 64 bit words ordered from
3102 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
3103 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
3104 // a word.
3105 while (LoadBytes > sizeof(uint64_t)) {
3106 LoadBytes -= sizeof(uint64_t);
3107 // May not be aligned so use memcpy.
3108 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
3109 Dst += sizeof(uint64_t);
3110 }
3111
3112 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
3113 }
3114}

/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h

1//===-- llvm/ADT/APInt.h - For Arbitrary Precision Integer -----*- C++ -*--===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// This file implements a class to represent arbitrary precision
11/// integral constant values and operations on them.
12///
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_ADT_APINT_H
16#define LLVM_ADT_APINT_H
17
18#include "llvm/Support/Compiler.h"
19#include "llvm/Support/MathExtras.h"
20#include <cassert>
21#include <climits>
22#include <cstring>
23#include <string>
24
25namespace llvm {
26class FoldingSetNodeID;
27class StringRef;
28class hash_code;
29class raw_ostream;
30
31template <typename T> class SmallVectorImpl;
32template <typename T> class ArrayRef;
33template <typename T> class Optional;
34
35class APInt;
36
37inline APInt operator-(APInt);
38
39//===----------------------------------------------------------------------===//
40// APInt Class
41//===----------------------------------------------------------------------===//
42
43/// Class for arbitrary precision integers.
44///
45/// APInt is a functional replacement for common case unsigned integer type like
46/// "unsigned", "unsigned long" or "uint64_t", but also allows non-byte-width
47/// integer sizes and large integer value types such as 3-bits, 15-bits, or more
48/// than 64-bits of precision. APInt provides a variety of arithmetic operators
49/// and methods to manipulate integer values of any bit-width. It supports both
50/// the typical integer arithmetic and comparison operations as well as bitwise
51/// manipulation.
52///
53/// The class has several invariants worth noting:
54/// * All bit, byte, and word positions are zero-based.
55/// * Once the bit width is set, it doesn't change except by the Truncate,
56/// SignExtend, or ZeroExtend operations.
57/// * All binary operators must be on APInt instances of the same bit width.
58/// Attempting to use these operators on instances with different bit
59/// widths will yield an assertion.
60/// * The value is stored canonically as an unsigned value. For operations
61/// where it makes a difference, there are both signed and unsigned variants
62/// of the operation. For example, sdiv and udiv. However, because the bit
63/// widths must be the same, operations such as Mul and Add produce the same
64/// results regardless of whether the values are interpreted as signed or
65/// not.
66/// * In general, the class tries to follow the style of computation that LLVM
67/// uses in its IR. This simplifies its use for LLVM.
68///
69class LLVM_NODISCARD[[clang::warn_unused_result]] APInt {
70public:
71 typedef uint64_t WordType;
72
73 /// This enum is used to hold the constants we needed for APInt.
74 enum : unsigned {
75 /// Byte size of a word.
76 APINT_WORD_SIZE = sizeof(WordType),
77 /// Bits in a word.
78 APINT_BITS_PER_WORD = APINT_WORD_SIZE * CHAR_BIT8
79 };
80
81 enum class Rounding {
82 DOWN,
83 TOWARD_ZERO,
84 UP,
85 };
86
87 static const WordType WORDTYPE_MAX = ~WordType(0);
88
89private:
90 /// This union is used to store the integer value. When the
91 /// integer bit-width <= 64, it uses VAL, otherwise it uses pVal.
92 union {
93 uint64_t VAL; ///< Used to store the <= 64 bits integer value.
94 uint64_t *pVal; ///< Used to store the >64 bits integer value.
95 } U;
96
97 unsigned BitWidth; ///< The number of bits in this APInt.
98
99 friend struct DenseMapAPIntKeyInfo;
100
101 friend class APSInt;
102
103 /// Fast internal constructor
104 ///
105 /// This constructor is used only internally for speed of construction of
106 /// temporaries. It is unsafe for general use so it is not public.
107 APInt(uint64_t *val, unsigned bits) : BitWidth(bits) {
108 U.pVal = val;
109 }
110
111 /// Determine if this APInt just has one word to store value.
112 ///
113 /// \returns true if the number of bits <= 64, false otherwise.
114 bool isSingleWord() const { return BitWidth <= APINT_BITS_PER_WORD; }
115
116 /// Determine which word a bit is in.
117 ///
118 /// \returns the word position for the specified bit position.
119 static unsigned whichWord(unsigned bitPosition) {
120 return bitPosition / APINT_BITS_PER_WORD;
121 }
122
123 /// Determine which bit in a word a bit is in.
124 ///
125 /// \returns the bit position in a word for the specified bit position
126 /// in the APInt.
127 static unsigned whichBit(unsigned bitPosition) {
128 return bitPosition % APINT_BITS_PER_WORD;
129 }
130
131 /// Get a single bit mask.
132 ///
133 /// \returns a uint64_t with only bit at "whichBit(bitPosition)" set
134 /// This method generates and returns a uint64_t (word) mask for a single
135 /// bit at a specific bit position. This is used to mask the bit in the
136 /// corresponding word.
137 static uint64_t maskBit(unsigned bitPosition) {
138 return 1ULL << whichBit(bitPosition);
139 }
140
141 /// Clear unused high order bits
142 ///
143 /// This method is used internally to clear the top "N" bits in the high order
144 /// word that are not used by the APInt. This is needed after the most
145 /// significant word is assigned a value to ensure that those bits are
146 /// zero'd out.
147 APInt &clearUnusedBits() {
148 // Compute how many bits are used in the final word
149 unsigned WordBits = ((BitWidth-1) % APINT_BITS_PER_WORD) + 1;
150
151 // Mask out the high bits.
152 uint64_t mask = WORDTYPE_MAX >> (APINT_BITS_PER_WORD - WordBits);
153 if (isSingleWord())
154 U.VAL &= mask;
155 else
156 U.pVal[getNumWords() - 1] &= mask;
157 return *this;
158 }
159
160 /// Get the word corresponding to a bit position
161 /// \returns the corresponding word for the specified bit position.
162 uint64_t getWord(unsigned bitPosition) const {
163 return isSingleWord() ? U.VAL : U.pVal[whichWord(bitPosition)];
164 }
165
166 /// Utility method to change the bit width of this APInt to new bit width,
167 /// allocating and/or deallocating as necessary. There is no guarantee on the
168 /// value of any bits upon return. Caller should populate the bits after.
169 void reallocate(unsigned NewBitWidth);
170
171 /// Convert a char array into an APInt
172 ///
173 /// \param radix 2, 8, 10, 16, or 36
174 /// Converts a string into a number. The string must be non-empty
175 /// and well-formed as a number of the given base. The bit-width
176 /// must be sufficient to hold the result.
177 ///
178 /// This is used by the constructors that take string arguments.
179 ///
180 /// StringRef::getAsInteger is superficially similar but (1) does
181 /// not assume that the string is well-formed and (2) grows the
182 /// result to hold the input.
183 void fromString(unsigned numBits, StringRef str, uint8_t radix);
184
185 /// An internal division function for dividing APInts.
186 ///
187 /// This is used by the toString method to divide by the radix. It simply
188 /// provides a more convenient form of divide for internal use since KnuthDiv
189 /// has specific constraints on its inputs. If those constraints are not met
190 /// then it provides a simpler form of divide.
191 static void divide(const WordType *LHS, unsigned lhsWords,
192 const WordType *RHS, unsigned rhsWords, WordType *Quotient,
193 WordType *Remainder);
194
195 /// out-of-line slow case for inline constructor
196 void initSlowCase(uint64_t val, bool isSigned);
197
198 /// shared code between two array constructors
199 void initFromArray(ArrayRef<uint64_t> array);
200
201 /// out-of-line slow case for inline copy constructor
202 void initSlowCase(const APInt &that);
203
204 /// out-of-line slow case for shl
205 void shlSlowCase(unsigned ShiftAmt);
206
207 /// out-of-line slow case for lshr.
208 void lshrSlowCase(unsigned ShiftAmt);
209
210 /// out-of-line slow case for ashr.
211 void ashrSlowCase(unsigned ShiftAmt);
212
213 /// out-of-line slow case for operator=
214 void AssignSlowCase(const APInt &RHS);
215
216 /// out-of-line slow case for operator==
217 bool EqualSlowCase(const APInt &RHS) const LLVM_READONLY__attribute__((__pure__));
218
219 /// out-of-line slow case for countLeadingZeros
220 unsigned countLeadingZerosSlowCase() const LLVM_READONLY__attribute__((__pure__));
221
222 /// out-of-line slow case for countLeadingOnes.
223 unsigned countLeadingOnesSlowCase() const LLVM_READONLY__attribute__((__pure__));
224
225 /// out-of-line slow case for countTrailingZeros.
226 unsigned countTrailingZerosSlowCase() const LLVM_READONLY__attribute__((__pure__));
227
228 /// out-of-line slow case for countTrailingOnes
229 unsigned countTrailingOnesSlowCase() const LLVM_READONLY__attribute__((__pure__));
230
231 /// out-of-line slow case for countPopulation
232 unsigned countPopulationSlowCase() const LLVM_READONLY__attribute__((__pure__));
233
234 /// out-of-line slow case for intersects.
235 bool intersectsSlowCase(const APInt &RHS) const LLVM_READONLY__attribute__((__pure__));
236
237 /// out-of-line slow case for isSubsetOf.
238 bool isSubsetOfSlowCase(const APInt &RHS) const LLVM_READONLY__attribute__((__pure__));
239
240 /// out-of-line slow case for setBits.
241 void setBitsSlowCase(unsigned loBit, unsigned hiBit);
242
243 /// out-of-line slow case for flipAllBits.
244 void flipAllBitsSlowCase();
245
246 /// out-of-line slow case for operator&=.
247 void AndAssignSlowCase(const APInt& RHS);
248
249 /// out-of-line slow case for operator|=.
250 void OrAssignSlowCase(const APInt& RHS);
251
252 /// out-of-line slow case for operator^=.
253 void XorAssignSlowCase(const APInt& RHS);
254
255 /// Unsigned comparison. Returns -1, 0, or 1 if this APInt is less than, equal
256 /// to, or greater than RHS.
257 int compare(const APInt &RHS) const LLVM_READONLY__attribute__((__pure__));
258
259 /// Signed comparison. Returns -1, 0, or 1 if this APInt is less than, equal
260 /// to, or greater than RHS.
261 int compareSigned(const APInt &RHS) const LLVM_READONLY__attribute__((__pure__));
262
263public:
264 /// \name Constructors
265 /// @{
266
267 /// Create a new APInt of numBits width, initialized as val.
268 ///
269 /// If isSigned is true then val is treated as if it were a signed value
270 /// (i.e. as an int64_t) and the appropriate sign extension to the bit width
271 /// will be done. Otherwise, no sign extension occurs (high order bits beyond
272 /// the range of val are zero filled).
273 ///
274 /// \param numBits the bit width of the constructed APInt
275 /// \param val the initial value of the APInt
276 /// \param isSigned how to treat signedness of val
277 APInt(unsigned numBits, uint64_t val, bool isSigned = false)
278 : BitWidth(numBits) {
279 assert
24.1
Field 'BitWidth' is not equal to 0
24.1
Field 'BitWidth' is not equal to 0
(BitWidth && "bitwidth too small")((BitWidth && "bitwidth too small") ? static_cast<
void> (0) : __assert_fail ("BitWidth && \"bitwidth too small\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 279, __PRETTY_FUNCTION__))
;
25
'?' condition is true
280 if (isSingleWord()) {
26
Taking false branch
281 U.VAL = val;
282 clearUnusedBits();
283 } else {
284 initSlowCase(val, isSigned);
27
Calling 'APInt::initSlowCase'
31
Returned allocated memory
285 }
286 }
287
288 /// Construct an APInt of numBits width, initialized as bigVal[].
289 ///
290 /// Note that bigVal.size() can be smaller or larger than the corresponding
291 /// bit width but any extraneous bits will be dropped.
292 ///
293 /// \param numBits the bit width of the constructed APInt
294 /// \param bigVal a sequence of words to form the initial value of the APInt
295 APInt(unsigned numBits, ArrayRef<uint64_t> bigVal);
296
297 /// Equivalent to APInt(numBits, ArrayRef<uint64_t>(bigVal, numWords)), but
298 /// deprecated because this constructor is prone to ambiguity with the
299 /// APInt(unsigned, uint64_t, bool) constructor.
300 ///
301 /// If this overload is ever deleted, care should be taken to prevent calls
302 /// from being incorrectly captured by the APInt(unsigned, uint64_t, bool)
303 /// constructor.
304 APInt(unsigned numBits, unsigned numWords, const uint64_t bigVal[]);
305
306 /// Construct an APInt from a string representation.
307 ///
308 /// This constructor interprets the string \p str in the given radix. The
309 /// interpretation stops when the first character that is not suitable for the
310 /// radix is encountered, or the end of the string. Acceptable radix values
311 /// are 2, 8, 10, 16, and 36. It is an error for the value implied by the
312 /// string to require more bits than numBits.
313 ///
314 /// \param numBits the bit width of the constructed APInt
315 /// \param str the string to be interpreted
316 /// \param radix the radix to use for the conversion
317 APInt(unsigned numBits, StringRef str, uint8_t radix);
318
319 /// Simply makes *this a copy of that.
320 /// Copy Constructor.
321 APInt(const APInt &that) : BitWidth(that.BitWidth) {
322 if (isSingleWord())
323 U.VAL = that.U.VAL;
324 else
325 initSlowCase(that);
326 }
327
328 /// Move Constructor.
329 APInt(APInt &&that) : BitWidth(that.BitWidth) {
330 memcpy(&U, &that.U, sizeof(U));
331 that.BitWidth = 0;
332 }
333
334 /// Destructor.
335 ~APInt() {
336 if (needsCleanup())
337 delete[] U.pVal;
338 }
339
340 /// Default constructor that creates an uninteresting APInt
341 /// representing a 1-bit zero value.
342 ///
343 /// This is useful for object deserialization (pair this with the static
344 /// method Read).
345 explicit APInt() : BitWidth(1) { U.VAL = 0; }
346
347 /// Returns whether this instance allocated memory.
348 bool needsCleanup() const { return !isSingleWord(); }
349
350 /// Used to insert APInt objects, or objects that contain APInt objects, into
351 /// FoldingSets.
352 void Profile(FoldingSetNodeID &id) const;
353
354 /// @}
355 /// \name Value Tests
356 /// @{
357
358 /// Determine sign of this APInt.
359 ///
360 /// This tests the high bit of this APInt to determine if it is set.
361 ///
362 /// \returns true if this APInt is negative, false otherwise
363 bool isNegative() const { return (*this)[BitWidth - 1]; }
364
365 /// Determine if this APInt Value is non-negative (>= 0)
366 ///
367 /// This tests the high bit of the APInt to determine if it is unset.
368 bool isNonNegative() const { return !isNegative(); }
369
370 /// Determine if sign bit of this APInt is set.
371 ///
372 /// This tests the high bit of this APInt to determine if it is set.
373 ///
374 /// \returns true if this APInt has its sign bit set, false otherwise.
375 bool isSignBitSet() const { return (*this)[BitWidth-1]; }
376
377 /// Determine if sign bit of this APInt is clear.
378 ///
379 /// This tests the high bit of this APInt to determine if it is clear.
380 ///
381 /// \returns true if this APInt has its sign bit clear, false otherwise.
382 bool isSignBitClear() const { return !isSignBitSet(); }
383
384 /// Determine if this APInt Value is positive.
385 ///
386 /// This tests if the value of this APInt is positive (> 0). Note
387 /// that 0 is not a positive value.
388 ///
389 /// \returns true if this APInt is positive.
390 bool isStrictlyPositive() const { return isNonNegative() && !isNullValue(); }
391
392 /// Determine if this APInt Value is non-positive (<= 0).
393 ///
394 /// \returns true if this APInt is non-positive.
395 bool isNonPositive() const { return !isStrictlyPositive(); }
396
397 /// Determine if all bits are set
398 ///
399 /// This checks to see if the value has all bits of the APInt are set or not.
400 bool isAllOnesValue() const {
401 if (isSingleWord())
402 return U.VAL == WORDTYPE_MAX >> (APINT_BITS_PER_WORD - BitWidth);
403 return countTrailingOnesSlowCase() == BitWidth;
404 }
405
406 /// Determine if all bits are clear
407 ///
408 /// This checks to see if the value has all bits of the APInt are clear or
409 /// not.
410 bool isNullValue() const { return !*this; }
411
412 /// Determine if this is a value of 1.
413 ///
414 /// This checks to see if the value of this APInt is one.
415 bool isOneValue() const {
416 if (isSingleWord())
417 return U.VAL == 1;
418 return countLeadingZerosSlowCase() == BitWidth - 1;
419 }
420
421 /// Determine if this is the largest unsigned value.
422 ///
423 /// This checks to see if the value of this APInt is the maximum unsigned
424 /// value for the APInt's bit width.
425 bool isMaxValue() const { return isAllOnesValue(); }
426
427 /// Determine if this is the largest signed value.
428 ///
429 /// This checks to see if the value of this APInt is the maximum signed
430 /// value for the APInt's bit width.
431 bool isMaxSignedValue() const {
432 if (isSingleWord())
433 return U.VAL == ((WordType(1) << (BitWidth - 1)) - 1);
434 return !isNegative() && countTrailingOnesSlowCase() == BitWidth - 1;
435 }
436
437 /// Determine if this is the smallest unsigned value.
438 ///
439 /// This checks to see if the value of this APInt is the minimum unsigned
440 /// value for the APInt's bit width.
441 bool isMinValue() const { return isNullValue(); }
442
443 /// Determine if this is the smallest signed value.
444 ///
445 /// This checks to see if the value of this APInt is the minimum signed
446 /// value for the APInt's bit width.
447 bool isMinSignedValue() const {
448 if (isSingleWord())
449 return U.VAL == (WordType(1) << (BitWidth - 1));
450 return isNegative() && countTrailingZerosSlowCase() == BitWidth - 1;
451 }
452
453 /// Check if this APInt has an N-bits unsigned integer value.
454 bool isIntN(unsigned N) const {
455 assert(N && "N == 0 ???")((N && "N == 0 ???") ? static_cast<void> (0) : __assert_fail
("N && \"N == 0 ???\"", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 455, __PRETTY_FUNCTION__))
;
456 return getActiveBits() <= N;
457 }
458
459 /// Check if this APInt has an N-bits signed integer value.
460 bool isSignedIntN(unsigned N) const {
461 assert(N && "N == 0 ???")((N && "N == 0 ???") ? static_cast<void> (0) : __assert_fail
("N && \"N == 0 ???\"", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 461, __PRETTY_FUNCTION__))
;
462 return getMinSignedBits() <= N;
463 }
464
465 /// Check if this APInt's value is a power of two greater than zero.
466 ///
467 /// \returns true if the argument APInt value is a power of two > 0.
468 bool isPowerOf2() const {
469 if (isSingleWord())
470 return isPowerOf2_64(U.VAL);
471 return countPopulationSlowCase() == 1;
472 }
473
474 /// Check if the APInt's value is returned by getSignMask.
475 ///
476 /// \returns true if this is the value returned by getSignMask.
477 bool isSignMask() const { return isMinSignedValue(); }
478
479 /// Convert APInt to a boolean value.
480 ///
481 /// This converts the APInt to a boolean value as a test against zero.
482 bool getBoolValue() const { return !!*this; }
483
484 /// If this value is smaller than the specified limit, return it, otherwise
485 /// return the limit value. This causes the value to saturate to the limit.
486 uint64_t getLimitedValue(uint64_t Limit = UINT64_MAX(18446744073709551615UL)) const {
487 return ugt(Limit) ? Limit : getZExtValue();
488 }
489
490 /// Check if the APInt consists of a repeated bit pattern.
491 ///
492 /// e.g. 0x01010101 satisfies isSplat(8).
493 /// \param SplatSizeInBits The size of the pattern in bits. Must divide bit
494 /// width without remainder.
495 bool isSplat(unsigned SplatSizeInBits) const;
496
497 /// \returns true if this APInt value is a sequence of \param numBits ones
498 /// starting at the least significant bit with the remainder zero.
499 bool isMask(unsigned numBits) const {
500 assert(numBits != 0 && "numBits must be non-zero")((numBits != 0 && "numBits must be non-zero") ? static_cast
<void> (0) : __assert_fail ("numBits != 0 && \"numBits must be non-zero\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 500, __PRETTY_FUNCTION__))
;
501 assert(numBits <= BitWidth && "numBits out of range")((numBits <= BitWidth && "numBits out of range") ?
static_cast<void> (0) : __assert_fail ("numBits <= BitWidth && \"numBits out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 501, __PRETTY_FUNCTION__))
;
502 if (isSingleWord())
503 return U.VAL == (WORDTYPE_MAX >> (APINT_BITS_PER_WORD - numBits));
504 unsigned Ones = countTrailingOnesSlowCase();
505 return (numBits == Ones) &&
506 ((Ones + countLeadingZerosSlowCase()) == BitWidth);
507 }
508
509 /// \returns true if this APInt is a non-empty sequence of ones starting at
510 /// the least significant bit with the remainder zero.
511 /// Ex. isMask(0x0000FFFFU) == true.
512 bool isMask() const {
513 if (isSingleWord())
514 return isMask_64(U.VAL);
515 unsigned Ones = countTrailingOnesSlowCase();
516 return (Ones > 0) && ((Ones + countLeadingZerosSlowCase()) == BitWidth);
517 }
518
519 /// Return true if this APInt value contains a sequence of ones with
520 /// the remainder zero.
521 bool isShiftedMask() const {
522 if (isSingleWord())
523 return isShiftedMask_64(U.VAL);
524 unsigned Ones = countPopulationSlowCase();
525 unsigned LeadZ = countLeadingZerosSlowCase();
526 return (Ones + LeadZ + countTrailingZeros()) == BitWidth;
527 }
528
529 /// @}
530 /// \name Value Generators
531 /// @{
532
533 /// Gets maximum unsigned value of APInt for specific bit width.
534 static APInt getMaxValue(unsigned numBits) {
535 return getAllOnesValue(numBits);
536 }
537
538 /// Gets maximum signed value of APInt for a specific bit width.
539 static APInt getSignedMaxValue(unsigned numBits) {
540 APInt API = getAllOnesValue(numBits);
541 API.clearBit(numBits - 1);
542 return API;
543 }
544
545 /// Gets minimum unsigned value of APInt for a specific bit width.
546 static APInt getMinValue(unsigned numBits) { return APInt(numBits, 0); }
547
548 /// Gets minimum signed value of APInt for a specific bit width.
549 static APInt getSignedMinValue(unsigned numBits) {
550 APInt API(numBits, 0);
551 API.setBit(numBits - 1);
552 return API;
553 }
554
555 /// Get the SignMask for a specific bit width.
556 ///
557 /// This is just a wrapper function of getSignedMinValue(), and it helps code
558 /// readability when we want to get a SignMask.
559 static APInt getSignMask(unsigned BitWidth) {
560 return getSignedMinValue(BitWidth);
561 }
562
563 /// Get the all-ones value.
564 ///
565 /// \returns the all-ones value for an APInt of the specified bit-width.
566 static APInt getAllOnesValue(unsigned numBits) {
567 return APInt(numBits, WORDTYPE_MAX, true);
568 }
569
570 /// Get the '0' value.
571 ///
572 /// \returns the '0' value for an APInt of the specified bit-width.
573 static APInt getNullValue(unsigned numBits) { return APInt(numBits, 0); }
574
575 /// Compute an APInt containing numBits highbits from this APInt.
576 ///
577 /// Get an APInt with the same BitWidth as this APInt, just zero mask
578 /// the low bits and right shift to the least significant bit.
579 ///
580 /// \returns the high "numBits" bits of this APInt.
581 APInt getHiBits(unsigned numBits) const;
582
583 /// Compute an APInt containing numBits lowbits from this APInt.
584 ///
585 /// Get an APInt with the same BitWidth as this APInt, just zero mask
586 /// the high bits.
587 ///
588 /// \returns the low "numBits" bits of this APInt.
589 APInt getLoBits(unsigned numBits) const;
590
591 /// Return an APInt with exactly one bit set in the result.
592 static APInt getOneBitSet(unsigned numBits, unsigned BitNo) {
593 APInt Res(numBits, 0);
594 Res.setBit(BitNo);
595 return Res;
596 }
597
598 /// Get a value with a block of bits set.
599 ///
600 /// Constructs an APInt value that has a contiguous range of bits set. The
601 /// bits from loBit (inclusive) to hiBit (exclusive) will be set. All other
602 /// bits will be zero. For example, with parameters(32, 0, 16) you would get
603 /// 0x0000FFFF. Please call getBitsSetWithWrap if \p loBit may be greater than
604 /// \p hiBit.
605 ///
606 /// \param numBits the intended bit width of the result
607 /// \param loBit the index of the lowest bit set.
608 /// \param hiBit the index of the highest bit set.
609 ///
610 /// \returns An APInt value with the requested bits set.
611 static APInt getBitsSet(unsigned numBits, unsigned loBit, unsigned hiBit) {
612 assert(loBit <= hiBit && "loBit greater than hiBit")((loBit <= hiBit && "loBit greater than hiBit") ? static_cast
<void> (0) : __assert_fail ("loBit <= hiBit && \"loBit greater than hiBit\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 612, __PRETTY_FUNCTION__))
;
613 APInt Res(numBits, 0);
614 Res.setBits(loBit, hiBit);
615 return Res;
616 }
617
618 /// Wrap version of getBitsSet.
619 /// If \p hiBit is no less than \p loBit, this is same with getBitsSet.
620 /// If \p hiBit is less than \p loBit, the set bits "wrap". For example, with
621 /// parameters (32, 28, 4), you would get 0xF000000F.
622 static APInt getBitsSetWithWrap(unsigned numBits, unsigned loBit,
623 unsigned hiBit) {
624 APInt Res(numBits, 0);
625 Res.setBitsWithWrap(loBit, hiBit);
626 return Res;
627 }
628
629 /// Get a value with upper bits starting at loBit set.
630 ///
631 /// Constructs an APInt value that has a contiguous range of bits set. The
632 /// bits from loBit (inclusive) to numBits (exclusive) will be set. All other
633 /// bits will be zero. For example, with parameters(32, 12) you would get
634 /// 0xFFFFF000.
635 ///
636 /// \param numBits the intended bit width of the result
637 /// \param loBit the index of the lowest bit to set.
638 ///
639 /// \returns An APInt value with the requested bits set.
640 static APInt getBitsSetFrom(unsigned numBits, unsigned loBit) {
641 APInt Res(numBits, 0);
642 Res.setBitsFrom(loBit);
643 return Res;
644 }
645
646 /// Get a value with high bits set
647 ///
648 /// Constructs an APInt value that has the top hiBitsSet bits set.
649 ///
650 /// \param numBits the bitwidth of the result
651 /// \param hiBitsSet the number of high-order bits set in the result.
652 static APInt getHighBitsSet(unsigned numBits, unsigned hiBitsSet) {
653 APInt Res(numBits, 0);
654 Res.setHighBits(hiBitsSet);
655 return Res;
656 }
657
658 /// Get a value with low bits set
659 ///
660 /// Constructs an APInt value that has the bottom loBitsSet bits set.
661 ///
662 /// \param numBits the bitwidth of the result
663 /// \param loBitsSet the number of low-order bits set in the result.
664 static APInt getLowBitsSet(unsigned numBits, unsigned loBitsSet) {
665 APInt Res(numBits, 0);
666 Res.setLowBits(loBitsSet);
667 return Res;
668 }
669
670 /// Return a value containing V broadcasted over NewLen bits.
671 static APInt getSplat(unsigned NewLen, const APInt &V);
672
673 /// Determine if two APInts have the same value, after zero-extending
674 /// one of them (if needed!) to ensure that the bit-widths match.
675 static bool isSameValue(const APInt &I1, const APInt &I2) {
676 if (I1.getBitWidth() == I2.getBitWidth())
677 return I1 == I2;
678
679 if (I1.getBitWidth() > I2.getBitWidth())
680 return I1 == I2.zext(I1.getBitWidth());
681
682 return I1.zext(I2.getBitWidth()) == I2;
683 }
684
685 /// Overload to compute a hash_code for an APInt value.
686 friend hash_code hash_value(const APInt &Arg);
687
688 /// This function returns a pointer to the internal storage of the APInt.
689 /// This is useful for writing out the APInt in binary form without any
690 /// conversions.
691 const uint64_t *getRawData() const {
692 if (isSingleWord())
693 return &U.VAL;
694 return &U.pVal[0];
695 }
696
697 /// @}
698 /// \name Unary Operators
699 /// @{
700
701 /// Postfix increment operator.
702 ///
703 /// Increments *this by 1.
704 ///
705 /// \returns a new APInt value representing the original value of *this.
706 const APInt operator++(int) {
707 APInt API(*this);
708 ++(*this);
709 return API;
710 }
711
712 /// Prefix increment operator.
713 ///
714 /// \returns *this incremented by one
715 APInt &operator++();
716
717 /// Postfix decrement operator.
718 ///
719 /// Decrements *this by 1.
720 ///
721 /// \returns a new APInt value representing the original value of *this.
722 const APInt operator--(int) {
723 APInt API(*this);
724 --(*this);
725 return API;
726 }
727
728 /// Prefix decrement operator.
729 ///
730 /// \returns *this decremented by one.
731 APInt &operator--();
732
733 /// Logical negation operator.
734 ///
735 /// Performs logical negation operation on this APInt.
736 ///
737 /// \returns true if *this is zero, false otherwise.
738 bool operator!() const {
739 if (isSingleWord())
740 return U.VAL == 0;
741 return countLeadingZerosSlowCase() == BitWidth;
742 }
743
744 /// @}
745 /// \name Assignment Operators
746 /// @{
747
748 /// Copy assignment operator.
749 ///
750 /// \returns *this after assignment of RHS.
751 APInt &operator=(const APInt &RHS) {
752 // If the bitwidths are the same, we can avoid mucking with memory
753 if (isSingleWord() && RHS.isSingleWord()) {
754 U.VAL = RHS.U.VAL;
755 BitWidth = RHS.BitWidth;
756 return clearUnusedBits();
757 }
758
759 AssignSlowCase(RHS);
760 return *this;
761 }
762
763 /// Move assignment operator.
764 APInt &operator=(APInt &&that) {
765#ifdef _MSC_VER
766 // The MSVC std::shuffle implementation still does self-assignment.
767 if (this == &that)
768 return *this;
769#endif
770 assert(this != &that && "Self-move not supported")((this != &that && "Self-move not supported") ? static_cast
<void> (0) : __assert_fail ("this != &that && \"Self-move not supported\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 770, __PRETTY_FUNCTION__))
;
36
'?' condition is true
771 if (!isSingleWord())
37
Taking true branch
772 delete[] U.pVal;
38
Memory is released
773
774 // Use memcpy so that type based alias analysis sees both VAL and pVal
775 // as modified.
776 memcpy(&U, &that.U, sizeof(U));
777
778 BitWidth = that.BitWidth;
779 that.BitWidth = 0;
780
781 return *this;
782 }
783
784 /// Assignment operator.
785 ///
786 /// The RHS value is assigned to *this. If the significant bits in RHS exceed
787 /// the bit width, the excess bits are truncated. If the bit width is larger
788 /// than 64, the value is zero filled in the unspecified high order bits.
789 ///
790 /// \returns *this after assignment of RHS value.
791 APInt &operator=(uint64_t RHS) {
792 if (isSingleWord()) {
793 U.VAL = RHS;
794 clearUnusedBits();
795 } else {
796 U.pVal[0] = RHS;
797 memset(U.pVal+1, 0, (getNumWords() - 1) * APINT_WORD_SIZE);
798 }
799 return *this;
800 }
801
802 /// Bitwise AND assignment operator.
803 ///
804 /// Performs a bitwise AND operation on this APInt and RHS. The result is
805 /// assigned to *this.
806 ///
807 /// \returns *this after ANDing with RHS.
808 APInt &operator&=(const APInt &RHS) {
809 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 809, __PRETTY_FUNCTION__))
;
810 if (isSingleWord())
811 U.VAL &= RHS.U.VAL;
812 else
813 AndAssignSlowCase(RHS);
814 return *this;
815 }
816
817 /// Bitwise AND assignment operator.
818 ///
819 /// Performs a bitwise AND operation on this APInt and RHS. RHS is
820 /// logically zero-extended or truncated to match the bit-width of
821 /// the LHS.
822 APInt &operator&=(uint64_t RHS) {
823 if (isSingleWord()) {
824 U.VAL &= RHS;
825 return *this;
826 }
827 U.pVal[0] &= RHS;
828 memset(U.pVal+1, 0, (getNumWords() - 1) * APINT_WORD_SIZE);
829 return *this;
830 }
831
832 /// Bitwise OR assignment operator.
833 ///
834 /// Performs a bitwise OR operation on this APInt and RHS. The result is
835 /// assigned *this;
836 ///
837 /// \returns *this after ORing with RHS.
838 APInt &operator|=(const APInt &RHS) {
839 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 839, __PRETTY_FUNCTION__))
;
840 if (isSingleWord())
841 U.VAL |= RHS.U.VAL;
842 else
843 OrAssignSlowCase(RHS);
844 return *this;
845 }
846
847 /// Bitwise OR assignment operator.
848 ///
849 /// Performs a bitwise OR operation on this APInt and RHS. RHS is
850 /// logically zero-extended or truncated to match the bit-width of
851 /// the LHS.
852 APInt &operator|=(uint64_t RHS) {
853 if (isSingleWord()) {
854 U.VAL |= RHS;
855 clearUnusedBits();
856 } else {
857 U.pVal[0] |= RHS;
858 }
859 return *this;
860 }
861
862 /// Bitwise XOR assignment operator.
863 ///
864 /// Performs a bitwise XOR operation on this APInt and RHS. The result is
865 /// assigned to *this.
866 ///
867 /// \returns *this after XORing with RHS.
868 APInt &operator^=(const APInt &RHS) {
869 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 869, __PRETTY_FUNCTION__))
;
870 if (isSingleWord())
871 U.VAL ^= RHS.U.VAL;
872 else
873 XorAssignSlowCase(RHS);
874 return *this;
875 }
876
877 /// Bitwise XOR assignment operator.
878 ///
879 /// Performs a bitwise XOR operation on this APInt and RHS. RHS is
880 /// logically zero-extended or truncated to match the bit-width of
881 /// the LHS.
882 APInt &operator^=(uint64_t RHS) {
883 if (isSingleWord()) {
884 U.VAL ^= RHS;
885 clearUnusedBits();
886 } else {
887 U.pVal[0] ^= RHS;
888 }
889 return *this;
890 }
891
892 /// Multiplication assignment operator.
893 ///
894 /// Multiplies this APInt by RHS and assigns the result to *this.
895 ///
896 /// \returns *this
897 APInt &operator*=(const APInt &RHS);
898 APInt &operator*=(uint64_t RHS);
899
900 /// Addition assignment operator.
901 ///
902 /// Adds RHS to *this and assigns the result to *this.
903 ///
904 /// \returns *this
905 APInt &operator+=(const APInt &RHS);
906 APInt &operator+=(uint64_t RHS);
907
908 /// Subtraction assignment operator.
909 ///
910 /// Subtracts RHS from *this and assigns the result to *this.
911 ///
912 /// \returns *this
913 APInt &operator-=(const APInt &RHS);
914 APInt &operator-=(uint64_t RHS);
915
916 /// Left-shift assignment function.
917 ///
918 /// Shifts *this left by shiftAmt and assigns the result to *this.
919 ///
920 /// \returns *this after shifting left by ShiftAmt
921 APInt &operator<<=(unsigned ShiftAmt) {
922 assert(ShiftAmt <= BitWidth && "Invalid shift amount")((ShiftAmt <= BitWidth && "Invalid shift amount") ?
static_cast<void> (0) : __assert_fail ("ShiftAmt <= BitWidth && \"Invalid shift amount\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 922, __PRETTY_FUNCTION__))
;
923 if (isSingleWord()) {
924 if (ShiftAmt == BitWidth)
925 U.VAL = 0;
926 else
927 U.VAL <<= ShiftAmt;
928 return clearUnusedBits();
929 }
930 shlSlowCase(ShiftAmt);
931 return *this;
932 }
933
934 /// Left-shift assignment function.
935 ///
936 /// Shifts *this left by shiftAmt and assigns the result to *this.
937 ///
938 /// \returns *this after shifting left by ShiftAmt
939 APInt &operator<<=(const APInt &ShiftAmt);
940
941 /// @}
942 /// \name Binary Operators
943 /// @{
944
945 /// Multiplication operator.
946 ///
947 /// Multiplies this APInt by RHS and returns the result.
948 APInt operator*(const APInt &RHS) const;
949
950 /// Left logical shift operator.
951 ///
952 /// Shifts this APInt left by \p Bits and returns the result.
953 APInt operator<<(unsigned Bits) const { return shl(Bits); }
954
955 /// Left logical shift operator.
956 ///
957 /// Shifts this APInt left by \p Bits and returns the result.
958 APInt operator<<(const APInt &Bits) const { return shl(Bits); }
959
960 /// Arithmetic right-shift function.
961 ///
962 /// Arithmetic right-shift this APInt by shiftAmt.
963 APInt ashr(unsigned ShiftAmt) const {
964 APInt R(*this);
965 R.ashrInPlace(ShiftAmt);
966 return R;
967 }
968
969 /// Arithmetic right-shift this APInt by ShiftAmt in place.
970 void ashrInPlace(unsigned ShiftAmt) {
971 assert(ShiftAmt <= BitWidth && "Invalid shift amount")((ShiftAmt <= BitWidth && "Invalid shift amount") ?
static_cast<void> (0) : __assert_fail ("ShiftAmt <= BitWidth && \"Invalid shift amount\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 971, __PRETTY_FUNCTION__))
;
972 if (isSingleWord()) {
973 int64_t SExtVAL = SignExtend64(U.VAL, BitWidth);
974 if (ShiftAmt == BitWidth)
975 U.VAL = SExtVAL >> (APINT_BITS_PER_WORD - 1); // Fill with sign bit.
976 else
977 U.VAL = SExtVAL >> ShiftAmt;
978 clearUnusedBits();
979 return;
980 }
981 ashrSlowCase(ShiftAmt);
982 }
983
984 /// Logical right-shift function.
985 ///
986 /// Logical right-shift this APInt by shiftAmt.
987 APInt lshr(unsigned shiftAmt) const {
988 APInt R(*this);
989 R.lshrInPlace(shiftAmt);
990 return R;
991 }
992
993 /// Logical right-shift this APInt by ShiftAmt in place.
994 void lshrInPlace(unsigned ShiftAmt) {
995 assert(ShiftAmt <= BitWidth && "Invalid shift amount")((ShiftAmt <= BitWidth && "Invalid shift amount") ?
static_cast<void> (0) : __assert_fail ("ShiftAmt <= BitWidth && \"Invalid shift amount\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 995, __PRETTY_FUNCTION__))
;
996 if (isSingleWord()) {
997 if (ShiftAmt == BitWidth)
998 U.VAL = 0;
999 else
1000 U.VAL >>= ShiftAmt;
1001 return;
1002 }
1003 lshrSlowCase(ShiftAmt);
1004 }
1005
1006 /// Left-shift function.
1007 ///
1008 /// Left-shift this APInt by shiftAmt.
1009 APInt shl(unsigned shiftAmt) const {
1010 APInt R(*this);
1011 R <<= shiftAmt;
1012 return R;
1013 }
1014
1015 /// Rotate left by rotateAmt.
1016 APInt rotl(unsigned rotateAmt) const;
1017
1018 /// Rotate right by rotateAmt.
1019 APInt rotr(unsigned rotateAmt) const;
1020
1021 /// Arithmetic right-shift function.
1022 ///
1023 /// Arithmetic right-shift this APInt by shiftAmt.
1024 APInt ashr(const APInt &ShiftAmt) const {
1025 APInt R(*this);
1026 R.ashrInPlace(ShiftAmt);
1027 return R;
1028 }
1029
1030 /// Arithmetic right-shift this APInt by shiftAmt in place.
1031 void ashrInPlace(const APInt &shiftAmt);
1032
1033 /// Logical right-shift function.
1034 ///
1035 /// Logical right-shift this APInt by shiftAmt.
1036 APInt lshr(const APInt &ShiftAmt) const {
1037 APInt R(*this);
1038 R.lshrInPlace(ShiftAmt);
1039 return R;
1040 }
1041
1042 /// Logical right-shift this APInt by ShiftAmt in place.
1043 void lshrInPlace(const APInt &ShiftAmt);
1044
1045 /// Left-shift function.
1046 ///
1047 /// Left-shift this APInt by shiftAmt.
1048 APInt shl(const APInt &ShiftAmt) const {
1049 APInt R(*this);
1050 R <<= ShiftAmt;
1051 return R;
1052 }
1053
1054 /// Rotate left by rotateAmt.
1055 APInt rotl(const APInt &rotateAmt) const;
1056
1057 /// Rotate right by rotateAmt.
1058 APInt rotr(const APInt &rotateAmt) const;
1059
1060 /// Unsigned division operation.
1061 ///
1062 /// Perform an unsigned divide operation on this APInt by RHS. Both this and
1063 /// RHS are treated as unsigned quantities for purposes of this division.
1064 ///
1065 /// \returns a new APInt value containing the division result, rounded towards
1066 /// zero.
1067 APInt udiv(const APInt &RHS) const;
1068 APInt udiv(uint64_t RHS) const;
1069
1070 /// Signed division function for APInt.
1071 ///
1072 /// Signed divide this APInt by APInt RHS.
1073 ///
1074 /// The result is rounded towards zero.
1075 APInt sdiv(const APInt &RHS) const;
1076 APInt sdiv(int64_t RHS) const;
1077
1078 /// Unsigned remainder operation.
1079 ///
1080 /// Perform an unsigned remainder operation on this APInt with RHS being the
1081 /// divisor. Both this and RHS are treated as unsigned quantities for purposes
1082 /// of this operation. Note that this is a true remainder operation and not a
1083 /// modulo operation because the sign follows the sign of the dividend which
1084 /// is *this.
1085 ///
1086 /// \returns a new APInt value containing the remainder result
1087 APInt urem(const APInt &RHS) const;
1088 uint64_t urem(uint64_t RHS) const;
1089
1090 /// Function for signed remainder operation.
1091 ///
1092 /// Signed remainder operation on APInt.
1093 APInt srem(const APInt &RHS) const;
1094 int64_t srem(int64_t RHS) const;
1095
1096 /// Dual division/remainder interface.
1097 ///
1098 /// Sometimes it is convenient to divide two APInt values and obtain both the
1099 /// quotient and remainder. This function does both operations in the same
1100 /// computation making it a little more efficient. The pair of input arguments
1101 /// may overlap with the pair of output arguments. It is safe to call
1102 /// udivrem(X, Y, X, Y), for example.
1103 static void udivrem(const APInt &LHS, const APInt &RHS, APInt &Quotient,
1104 APInt &Remainder);
1105 static void udivrem(const APInt &LHS, uint64_t RHS, APInt &Quotient,
1106 uint64_t &Remainder);
1107
1108 static void sdivrem(const APInt &LHS, const APInt &RHS, APInt &Quotient,
1109 APInt &Remainder);
1110 static void sdivrem(const APInt &LHS, int64_t RHS, APInt &Quotient,
1111 int64_t &Remainder);
1112
1113 // Operations that return overflow indicators.
1114 APInt sadd_ov(const APInt &RHS, bool &Overflow) const;
1115 APInt uadd_ov(const APInt &RHS, bool &Overflow) const;
1116 APInt ssub_ov(const APInt &RHS, bool &Overflow) const;
1117 APInt usub_ov(const APInt &RHS, bool &Overflow) const;
1118 APInt sdiv_ov(const APInt &RHS, bool &Overflow) const;
1119 APInt smul_ov(const APInt &RHS, bool &Overflow) const;
1120 APInt umul_ov(const APInt &RHS, bool &Overflow) const;
1121 APInt sshl_ov(const APInt &Amt, bool &Overflow) const;
1122 APInt ushl_ov(const APInt &Amt, bool &Overflow) const;
1123
1124 // Operations that saturate
1125 APInt sadd_sat(const APInt &RHS) const;
1126 APInt uadd_sat(const APInt &RHS) const;
1127 APInt ssub_sat(const APInt &RHS) const;
1128 APInt usub_sat(const APInt &RHS) const;
1129 APInt smul_sat(const APInt &RHS) const;
1130 APInt umul_sat(const APInt &RHS) const;
1131 APInt sshl_sat(const APInt &RHS) const;
1132 APInt ushl_sat(const APInt &RHS) const;
1133
1134 /// Array-indexing support.
1135 ///
1136 /// \returns the bit value at bitPosition
1137 bool operator[](unsigned bitPosition) const {
1138 assert(bitPosition < getBitWidth() && "Bit position out of bounds!")((bitPosition < getBitWidth() && "Bit position out of bounds!"
) ? static_cast<void> (0) : __assert_fail ("bitPosition < getBitWidth() && \"Bit position out of bounds!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1138, __PRETTY_FUNCTION__))
;
1139 return (maskBit(bitPosition) & getWord(bitPosition)) != 0;
1140 }
1141
1142 /// @}
1143 /// \name Comparison Operators
1144 /// @{
1145
1146 /// Equality operator.
1147 ///
1148 /// Compares this APInt with RHS for the validity of the equality
1149 /// relationship.
1150 bool operator==(const APInt &RHS) const {
1151 assert(BitWidth == RHS.BitWidth && "Comparison requires equal bit widths")((BitWidth == RHS.BitWidth && "Comparison requires equal bit widths"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Comparison requires equal bit widths\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1151, __PRETTY_FUNCTION__))
;
1152 if (isSingleWord())
1153 return U.VAL == RHS.U.VAL;
1154 return EqualSlowCase(RHS);
1155 }
1156
1157 /// Equality operator.
1158 ///
1159 /// Compares this APInt with a uint64_t for the validity of the equality
1160 /// relationship.
1161 ///
1162 /// \returns true if *this == Val
1163 bool operator==(uint64_t Val) const {
1164 return (isSingleWord() || getActiveBits() <= 64) && getZExtValue() == Val;
1165 }
1166
1167 /// Equality comparison.
1168 ///
1169 /// Compares this APInt with RHS for the validity of the equality
1170 /// relationship.
1171 ///
1172 /// \returns true if *this == Val
1173 bool eq(const APInt &RHS) const { return (*this) == RHS; }
1174
1175 /// Inequality operator.
1176 ///
1177 /// Compares this APInt with RHS for the validity of the inequality
1178 /// relationship.
1179 ///
1180 /// \returns true if *this != Val
1181 bool operator!=(const APInt &RHS) const { return !((*this) == RHS); }
1182
1183 /// Inequality operator.
1184 ///
1185 /// Compares this APInt with a uint64_t for the validity of the inequality
1186 /// relationship.
1187 ///
1188 /// \returns true if *this != Val
1189 bool operator!=(uint64_t Val) const { return !((*this) == Val); }
1190
1191 /// Inequality comparison
1192 ///
1193 /// Compares this APInt with RHS for the validity of the inequality
1194 /// relationship.
1195 ///
1196 /// \returns true if *this != Val
1197 bool ne(const APInt &RHS) const { return !((*this) == RHS); }
1198
1199 /// Unsigned less than comparison
1200 ///
1201 /// Regards both *this and RHS as unsigned quantities and compares them for
1202 /// the validity of the less-than relationship.
1203 ///
1204 /// \returns true if *this < RHS when both are considered unsigned.
1205 bool ult(const APInt &RHS) const { return compare(RHS) < 0; }
1206
1207 /// Unsigned less than comparison
1208 ///
1209 /// Regards both *this as an unsigned quantity and compares it with RHS for
1210 /// the validity of the less-than relationship.
1211 ///
1212 /// \returns true if *this < RHS when considered unsigned.
1213 bool ult(uint64_t RHS) const {
1214 // Only need to check active bits if not a single word.
1215 return (isSingleWord() || getActiveBits() <= 64) && getZExtValue() < RHS;
1216 }
1217
1218 /// Signed less than comparison
1219 ///
1220 /// Regards both *this and RHS as signed quantities and compares them for
1221 /// validity of the less-than relationship.
1222 ///
1223 /// \returns true if *this < RHS when both are considered signed.
1224 bool slt(const APInt &RHS) const { return compareSigned(RHS) < 0; }
1225
1226 /// Signed less than comparison
1227 ///
1228 /// Regards both *this as a signed quantity and compares it with RHS for
1229 /// the validity of the less-than relationship.
1230 ///
1231 /// \returns true if *this < RHS when considered signed.
1232 bool slt(int64_t RHS) const {
1233 return (!isSingleWord() && getMinSignedBits() > 64) ? isNegative()
1234 : getSExtValue() < RHS;
1235 }
1236
1237 /// Unsigned less or equal comparison
1238 ///
1239 /// Regards both *this and RHS as unsigned quantities and compares them for
1240 /// validity of the less-or-equal relationship.
1241 ///
1242 /// \returns true if *this <= RHS when both are considered unsigned.
1243 bool ule(const APInt &RHS) const { return compare(RHS) <= 0; }
1244
1245 /// Unsigned less or equal comparison
1246 ///
1247 /// Regards both *this as an unsigned quantity and compares it with RHS for
1248 /// the validity of the less-or-equal relationship.
1249 ///
1250 /// \returns true if *this <= RHS when considered unsigned.
1251 bool ule(uint64_t RHS) const { return !ugt(RHS); }
1252
1253 /// Signed less or equal comparison
1254 ///
1255 /// Regards both *this and RHS as signed quantities and compares them for
1256 /// validity of the less-or-equal relationship.
1257 ///
1258 /// \returns true if *this <= RHS when both are considered signed.
1259 bool sle(const APInt &RHS) const { return compareSigned(RHS) <= 0; }
1260
1261 /// Signed less or equal comparison
1262 ///
1263 /// Regards both *this as a signed quantity and compares it with RHS for the
1264 /// validity of the less-or-equal relationship.
1265 ///
1266 /// \returns true if *this <= RHS when considered signed.
1267 bool sle(uint64_t RHS) const { return !sgt(RHS); }
1268
1269 /// Unsigned greater than comparison
1270 ///
1271 /// Regards both *this and RHS as unsigned quantities and compares them for
1272 /// the validity of the greater-than relationship.
1273 ///
1274 /// \returns true if *this > RHS when both are considered unsigned.
1275 bool ugt(const APInt &RHS) const { return !ule(RHS); }
1276
1277 /// Unsigned greater than comparison
1278 ///
1279 /// Regards both *this as an unsigned quantity and compares it with RHS for
1280 /// the validity of the greater-than relationship.
1281 ///
1282 /// \returns true if *this > RHS when considered unsigned.
1283 bool ugt(uint64_t RHS) const {
1284 // Only need to check active bits if not a single word.
1285 return (!isSingleWord() && getActiveBits() > 64) || getZExtValue() > RHS;
1286 }
1287
1288 /// Signed greater than comparison
1289 ///
1290 /// Regards both *this and RHS as signed quantities and compares them for the
1291 /// validity of the greater-than relationship.
1292 ///
1293 /// \returns true if *this > RHS when both are considered signed.
1294 bool sgt(const APInt &RHS) const { return !sle(RHS); }
1295
1296 /// Signed greater than comparison
1297 ///
1298 /// Regards both *this as a signed quantity and compares it with RHS for
1299 /// the validity of the greater-than relationship.
1300 ///
1301 /// \returns true if *this > RHS when considered signed.
1302 bool sgt(int64_t RHS) const {
1303 return (!isSingleWord() && getMinSignedBits() > 64) ? !isNegative()
1304 : getSExtValue() > RHS;
1305 }
1306
1307 /// Unsigned greater or equal comparison
1308 ///
1309 /// Regards both *this and RHS as unsigned quantities and compares them for
1310 /// validity of the greater-or-equal relationship.
1311 ///
1312 /// \returns true if *this >= RHS when both are considered unsigned.
1313 bool uge(const APInt &RHS) const { return !ult(RHS); }
1314
1315 /// Unsigned greater or equal comparison
1316 ///
1317 /// Regards both *this as an unsigned quantity and compares it with RHS for
1318 /// the validity of the greater-or-equal relationship.
1319 ///
1320 /// \returns true if *this >= RHS when considered unsigned.
1321 bool uge(uint64_t RHS) const { return !ult(RHS); }
1322
1323 /// Signed greater or equal comparison
1324 ///
1325 /// Regards both *this and RHS as signed quantities and compares them for
1326 /// validity of the greater-or-equal relationship.
1327 ///
1328 /// \returns true if *this >= RHS when both are considered signed.
1329 bool sge(const APInt &RHS) const { return !slt(RHS); }
1330
1331 /// Signed greater or equal comparison
1332 ///
1333 /// Regards both *this as a signed quantity and compares it with RHS for
1334 /// the validity of the greater-or-equal relationship.
1335 ///
1336 /// \returns true if *this >= RHS when considered signed.
1337 bool sge(int64_t RHS) const { return !slt(RHS); }
1338
1339 /// This operation tests if there are any pairs of corresponding bits
1340 /// between this APInt and RHS that are both set.
1341 bool intersects(const APInt &RHS) const {
1342 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1342, __PRETTY_FUNCTION__))
;
1343 if (isSingleWord())
1344 return (U.VAL & RHS.U.VAL) != 0;
1345 return intersectsSlowCase(RHS);
1346 }
1347
1348 /// This operation checks that all bits set in this APInt are also set in RHS.
1349 bool isSubsetOf(const APInt &RHS) const {
1350 assert(BitWidth == RHS.BitWidth && "Bit widths must be the same")((BitWidth == RHS.BitWidth && "Bit widths must be the same"
) ? static_cast<void> (0) : __assert_fail ("BitWidth == RHS.BitWidth && \"Bit widths must be the same\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1350, __PRETTY_FUNCTION__))
;
1351 if (isSingleWord())
1352 return (U.VAL & ~RHS.U.VAL) == 0;
1353 return isSubsetOfSlowCase(RHS);
1354 }
1355
1356 /// @}
1357 /// \name Resizing Operators
1358 /// @{
1359
1360 /// Truncate to new width.
1361 ///
1362 /// Truncate the APInt to a specified width. It is an error to specify a width
1363 /// that is greater than or equal to the current width.
1364 APInt trunc(unsigned width) const;
1365
1366 /// Truncate to new width with unsigned saturation.
1367 ///
1368 /// If the APInt, treated as unsigned integer, can be losslessly truncated to
1369 /// the new bitwidth, then return truncated APInt. Else, return max value.
1370 APInt truncUSat(unsigned width) const;
1371
1372 /// Truncate to new width with signed saturation.
1373 ///
1374 /// If this APInt, treated as signed integer, can be losslessly truncated to
1375 /// the new bitwidth, then return truncated APInt. Else, return either
1376 /// signed min value if the APInt was negative, or signed max value.
1377 APInt truncSSat(unsigned width) const;
1378
1379 /// Sign extend to a new width.
1380 ///
1381 /// This operation sign extends the APInt to a new width. If the high order
1382 /// bit is set, the fill on the left will be done with 1 bits, otherwise zero.
1383 /// It is an error to specify a width that is less than or equal to the
1384 /// current width.
1385 APInt sext(unsigned width) const;
1386
1387 /// Zero extend to a new width.
1388 ///
1389 /// This operation zero extends the APInt to a new width. The high order bits
1390 /// are filled with 0 bits. It is an error to specify a width that is less
1391 /// than or equal to the current width.
1392 APInt zext(unsigned width) const;
1393
1394 /// Sign extend or truncate to width
1395 ///
1396 /// Make this APInt have the bit width given by \p width. The value is sign
1397 /// extended, truncated, or left alone to make it that width.
1398 APInt sextOrTrunc(unsigned width) const;
1399
1400 /// Zero extend or truncate to width
1401 ///
1402 /// Make this APInt have the bit width given by \p width. The value is zero
1403 /// extended, truncated, or left alone to make it that width.
1404 APInt zextOrTrunc(unsigned width) const;
1405
1406 /// Sign extend or truncate to width
1407 ///
1408 /// Make this APInt have the bit width given by \p width. The value is sign
1409 /// extended, or left alone to make it that width.
1410 APInt sextOrSelf(unsigned width) const;
1411
1412 /// Zero extend or truncate to width
1413 ///
1414 /// Make this APInt have the bit width given by \p width. The value is zero
1415 /// extended, or left alone to make it that width.
1416 APInt zextOrSelf(unsigned width) const;
1417
1418 /// @}
1419 /// \name Bit Manipulation Operators
1420 /// @{
1421
1422 /// Set every bit to 1.
1423 void setAllBits() {
1424 if (isSingleWord())
1425 U.VAL = WORDTYPE_MAX;
1426 else
1427 // Set all the bits in all the words.
1428 memset(U.pVal, -1, getNumWords() * APINT_WORD_SIZE);
1429 // Clear the unused ones
1430 clearUnusedBits();
1431 }
1432
1433 /// Set a given bit to 1.
1434 ///
1435 /// Set the given bit to 1 whose position is given as "bitPosition".
1436 void setBit(unsigned BitPosition) {
1437 assert(BitPosition < BitWidth && "BitPosition out of range")((BitPosition < BitWidth && "BitPosition out of range"
) ? static_cast<void> (0) : __assert_fail ("BitPosition < BitWidth && \"BitPosition out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1437, __PRETTY_FUNCTION__))
;
1438 WordType Mask = maskBit(BitPosition);
1439 if (isSingleWord())
1440 U.VAL |= Mask;
1441 else
1442 U.pVal[whichWord(BitPosition)] |= Mask;
1443 }
1444
1445 /// Set the sign bit to 1.
1446 void setSignBit() {
1447 setBit(BitWidth - 1);
1448 }
1449
1450 /// Set the bits from loBit (inclusive) to hiBit (exclusive) to 1.
1451 /// This function handles "wrap" case when \p loBit > \p hiBit, and calls
1452 /// setBits when \p loBit <= \p hiBit.
1453 void setBitsWithWrap(unsigned loBit, unsigned hiBit) {
1454 assert(hiBit <= BitWidth && "hiBit out of range")((hiBit <= BitWidth && "hiBit out of range") ? static_cast
<void> (0) : __assert_fail ("hiBit <= BitWidth && \"hiBit out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1454, __PRETTY_FUNCTION__))
;
1455 assert(loBit <= BitWidth && "loBit out of range")((loBit <= BitWidth && "loBit out of range") ? static_cast
<void> (0) : __assert_fail ("loBit <= BitWidth && \"loBit out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1455, __PRETTY_FUNCTION__))
;
1456 if (loBit <= hiBit) {
1457 setBits(loBit, hiBit);
1458 return;
1459 }
1460 setLowBits(hiBit);
1461 setHighBits(BitWidth - loBit);
1462 }
1463
1464 /// Set the bits from loBit (inclusive) to hiBit (exclusive) to 1.
1465 /// This function handles case when \p loBit <= \p hiBit.
1466 void setBits(unsigned loBit, unsigned hiBit) {
1467 assert(hiBit <= BitWidth && "hiBit out of range")((hiBit <= BitWidth && "hiBit out of range") ? static_cast
<void> (0) : __assert_fail ("hiBit <= BitWidth && \"hiBit out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1467, __PRETTY_FUNCTION__))
;
1468 assert(loBit <= BitWidth && "loBit out of range")((loBit <= BitWidth && "loBit out of range") ? static_cast
<void> (0) : __assert_fail ("loBit <= BitWidth && \"loBit out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1468, __PRETTY_FUNCTION__))
;
1469 assert(loBit <= hiBit && "loBit greater than hiBit")((loBit <= hiBit && "loBit greater than hiBit") ? static_cast
<void> (0) : __assert_fail ("loBit <= hiBit && \"loBit greater than hiBit\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1469, __PRETTY_FUNCTION__))
;
1470 if (loBit == hiBit)
1471 return;
1472 if (loBit < APINT_BITS_PER_WORD && hiBit <= APINT_BITS_PER_WORD) {
1473 uint64_t mask = WORDTYPE_MAX >> (APINT_BITS_PER_WORD - (hiBit - loBit));
1474 mask <<= loBit;
1475 if (isSingleWord())
1476 U.VAL |= mask;
1477 else
1478 U.pVal[0] |= mask;
1479 } else {
1480 setBitsSlowCase(loBit, hiBit);
1481 }
1482 }
1483
1484 /// Set the top bits starting from loBit.
1485 void setBitsFrom(unsigned loBit) {
1486 return setBits(loBit, BitWidth);
1487 }
1488
1489 /// Set the bottom loBits bits.
1490 void setLowBits(unsigned loBits) {
1491 return setBits(0, loBits);
1492 }
1493
1494 /// Set the top hiBits bits.
1495 void setHighBits(unsigned hiBits) {
1496 return setBits(BitWidth - hiBits, BitWidth);
1497 }
1498
1499 /// Set every bit to 0.
1500 void clearAllBits() {
1501 if (isSingleWord())
1502 U.VAL = 0;
1503 else
1504 memset(U.pVal, 0, getNumWords() * APINT_WORD_SIZE);
1505 }
1506
1507 /// Set a given bit to 0.
1508 ///
1509 /// Set the given bit to 0 whose position is given as "bitPosition".
1510 void clearBit(unsigned BitPosition) {
1511 assert(BitPosition < BitWidth && "BitPosition out of range")((BitPosition < BitWidth && "BitPosition out of range"
) ? static_cast<void> (0) : __assert_fail ("BitPosition < BitWidth && \"BitPosition out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1511, __PRETTY_FUNCTION__))
;
1512 WordType Mask = ~maskBit(BitPosition);
1513 if (isSingleWord())
1514 U.VAL &= Mask;
1515 else
1516 U.pVal[whichWord(BitPosition)] &= Mask;
1517 }
1518
1519 /// Set bottom loBits bits to 0.
1520 void clearLowBits(unsigned loBits) {
1521 assert(loBits <= BitWidth && "More bits than bitwidth")((loBits <= BitWidth && "More bits than bitwidth")
? static_cast<void> (0) : __assert_fail ("loBits <= BitWidth && \"More bits than bitwidth\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1521, __PRETTY_FUNCTION__))
;
1522 APInt Keep = getHighBitsSet(BitWidth, BitWidth - loBits);
1523 *this &= Keep;
1524 }
1525
1526 /// Set the sign bit to 0.
1527 void clearSignBit() {
1528 clearBit(BitWidth - 1);
1529 }
1530
1531 /// Toggle every bit to its opposite value.
1532 void flipAllBits() {
1533 if (isSingleWord()) {
1534 U.VAL ^= WORDTYPE_MAX;
1535 clearUnusedBits();
1536 } else {
1537 flipAllBitsSlowCase();
1538 }
1539 }
1540
1541 /// Toggles a given bit to its opposite value.
1542 ///
1543 /// Toggle a given bit to its opposite value whose position is given
1544 /// as "bitPosition".
1545 void flipBit(unsigned bitPosition);
1546
1547 /// Negate this APInt in place.
1548 void negate() {
1549 flipAllBits();
1550 ++(*this);
1551 }
1552
1553 /// Insert the bits from a smaller APInt starting at bitPosition.
1554 void insertBits(const APInt &SubBits, unsigned bitPosition);
1555 void insertBits(uint64_t SubBits, unsigned bitPosition, unsigned numBits);
1556
1557 /// Return an APInt with the extracted bits [bitPosition,bitPosition+numBits).
1558 APInt extractBits(unsigned numBits, unsigned bitPosition) const;
1559 uint64_t extractBitsAsZExtValue(unsigned numBits, unsigned bitPosition) const;
1560
1561 /// @}
1562 /// \name Value Characterization Functions
1563 /// @{
1564
1565 /// Return the number of bits in the APInt.
1566 unsigned getBitWidth() const { return BitWidth; }
1567
1568 /// Get the number of words.
1569 ///
1570 /// Here one word's bitwidth equals to that of uint64_t.
1571 ///
1572 /// \returns the number of words to hold the integer value of this APInt.
1573 unsigned getNumWords() const { return getNumWords(BitWidth); }
1574
1575 /// Get the number of words.
1576 ///
1577 /// *NOTE* Here one word's bitwidth equals to that of uint64_t.
1578 ///
1579 /// \returns the number of words to hold the integer value with a given bit
1580 /// width.
1581 static unsigned getNumWords(unsigned BitWidth) {
1582 return ((uint64_t)BitWidth + APINT_BITS_PER_WORD - 1) / APINT_BITS_PER_WORD;
1583 }
1584
1585 /// Compute the number of active bits in the value
1586 ///
1587 /// This function returns the number of active bits which is defined as the
1588 /// bit width minus the number of leading zeros. This is used in several
1589 /// computations to see how "wide" the value is.
1590 unsigned getActiveBits() const { return BitWidth - countLeadingZeros(); }
1591
1592 /// Compute the number of active words in the value of this APInt.
1593 ///
1594 /// This is used in conjunction with getActiveData to extract the raw value of
1595 /// the APInt.
1596 unsigned getActiveWords() const {
1597 unsigned numActiveBits = getActiveBits();
1598 return numActiveBits ? whichWord(numActiveBits - 1) + 1 : 1;
1599 }
1600
1601 /// Get the minimum bit size for this signed APInt
1602 ///
1603 /// Computes the minimum bit width for this APInt while considering it to be a
1604 /// signed (and probably negative) value. If the value is not negative, this
1605 /// function returns the same value as getActiveBits()+1. Otherwise, it
1606 /// returns the smallest bit width that will retain the negative value. For
1607 /// example, -1 can be written as 0b1 or 0xFFFFFFFFFF. 0b1 is shorter and so
1608 /// for -1, this function will always return 1.
1609 unsigned getMinSignedBits() const {
1610 if (isNegative())
1611 return BitWidth - countLeadingOnes() + 1;
1612 return getActiveBits() + 1;
1613 }
1614
1615 /// Get zero extended value
1616 ///
1617 /// This method attempts to return the value of this APInt as a zero extended
1618 /// uint64_t. The bitwidth must be <= 64 or the value must fit within a
1619 /// uint64_t. Otherwise an assertion will result.
1620 uint64_t getZExtValue() const {
1621 if (isSingleWord())
1622 return U.VAL;
1623 assert(getActiveBits() <= 64 && "Too many bits for uint64_t")((getActiveBits() <= 64 && "Too many bits for uint64_t"
) ? static_cast<void> (0) : __assert_fail ("getActiveBits() <= 64 && \"Too many bits for uint64_t\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1623, __PRETTY_FUNCTION__))
;
1624 return U.pVal[0];
1625 }
1626
1627 /// Get sign extended value
1628 ///
1629 /// This method attempts to return the value of this APInt as a sign extended
1630 /// int64_t. The bit width must be <= 64 or the value must fit within an
1631 /// int64_t. Otherwise an assertion will result.
1632 int64_t getSExtValue() const {
1633 if (isSingleWord())
1634 return SignExtend64(U.VAL, BitWidth);
1635 assert(getMinSignedBits() <= 64 && "Too many bits for int64_t")((getMinSignedBits() <= 64 && "Too many bits for int64_t"
) ? static_cast<void> (0) : __assert_fail ("getMinSignedBits() <= 64 && \"Too many bits for int64_t\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/APInt.h"
, 1635, __PRETTY_FUNCTION__))
;
1636 return int64_t(U.pVal[0]);
1637 }
1638
1639 /// Get bits required for string value.
1640 ///
1641 /// This method determines how many bits are required to hold the APInt
1642 /// equivalent of the string given by \p str.
1643 static unsigned getBitsNeeded(StringRef str, uint8_t radix);
1644
1645 /// The APInt version of the countLeadingZeros functions in
1646 /// MathExtras.h.
1647 ///
1648 /// It counts the number of zeros from the most significant bit to the first
1649 /// one bit.
1650 ///
1651 /// \returns BitWidth if the value is zero, otherwise returns the number of
1652 /// zeros from the most significant bit to the first one bits.
1653 unsigned countLeadingZeros() const {
1654 if (isSingleWord()) {
1655 unsigned unusedBits = APINT_BITS_PER_WORD - BitWidth;
1656 return llvm::countLeadingZeros(U.VAL) - unusedBits;
1657 }
1658 return countLeadingZerosSlowCase();
1659 }
1660
1661 /// Count the number of leading one bits.
1662 ///
1663 /// This function is an APInt version of the countLeadingOnes
1664 /// functions in MathExtras.h. It counts the number of ones from the most
1665 /// significant bit to the first zero bit.
1666 ///
1667 /// \returns 0 if the high order bit is not set, otherwise returns the number
1668 /// of 1 bits from the most significant to the least
1669 unsigned countLeadingOnes() const {
1670 if (isSingleWord())
1671 return llvm::countLeadingOnes(U.VAL << (APINT_BITS_PER_WORD - BitWidth));
1672 return countLeadingOnesSlowCase();
1673 }
1674
1675 /// Computes the number of leading bits of this APInt that are equal to its
1676 /// sign bit.
1677 unsigned getNumSignBits() const {
1678 return isNegative() ? countLeadingOnes() : countLeadingZeros();
1679 }
1680
1681 /// Count the number of trailing zero bits.
1682 ///
1683 /// This function is an APInt version of the countTrailingZeros
1684 /// functions in MathExtras.h. It counts the number of zeros from the least
1685 /// significant bit to the first set bit.
1686 ///
1687 /// \returns BitWidth if the value is zero, otherwise returns the number of
1688 /// zeros from the least significant bit to the first one bit.
1689 unsigned countTrailingZeros() const {
1690 if (isSingleWord())
1691 return std::min(unsigned(llvm::countTrailingZeros(U.VAL)), BitWidth);
1692 return countTrailingZerosSlowCase();
1693 }
1694
1695 /// Count the number of trailing one bits.
1696 ///
1697 /// This function is an APInt version of the countTrailingOnes
1698 /// functions in MathExtras.h. It counts the number of ones from the least
1699 /// significant bit to the first zero bit.
1700 ///
1701 /// \returns BitWidth if the value is all ones, otherwise returns the number
1702 /// of ones from the least significant bit to the first zero bit.
1703 unsigned countTrailingOnes() const {
1704 if (isSingleWord())
1705 return llvm::countTrailingOnes(U.VAL);
1706 return countTrailingOnesSlowCase();
1707 }
1708
1709 /// Count the number of bits set.
1710 ///
1711 /// This function is an APInt version of the countPopulation functions
1712 /// in MathExtras.h. It counts the number of 1 bits in the APInt value.
1713 ///
1714 /// \returns 0 if the value is zero, otherwise returns the number of set bits.
1715 unsigned countPopulation() const {
1716 if (isSingleWord())
1717 return llvm::countPopulation(U.VAL);
1718 return countPopulationSlowCase();
1719 }
1720
1721 /// @}
1722 /// \name Conversion Functions
1723 /// @{
1724 void print(raw_ostream &OS, bool isSigned) const;
1725
1726 /// Converts an APInt to a string and append it to Str. Str is commonly a
1727 /// SmallString.
1728 void toString(SmallVectorImpl<char> &Str, unsigned Radix, bool Signed,
1729 bool formatAsCLiteral = false) const;
1730
1731 /// Considers the APInt to be unsigned and converts it into a string in the
1732 /// radix given. The radix can be 2, 8, 10 16, or 36.
1733 void toStringUnsigned(SmallVectorImpl<char> &Str, unsigned Radix = 10) const {
1734 toString(Str, Radix, false, false);
1735 }
1736
1737 /// Considers the APInt to be signed and converts it into a string in the
1738 /// radix given. The radix can be 2, 8, 10, 16, or 36.
1739 void toStringSigned(SmallVectorImpl<char> &Str, unsigned Radix = 10) const {
1740 toString(Str, Radix, true, false);
1741 }
1742
1743 /// Return the APInt as a std::string.
1744 ///
1745 /// Note that this is an inefficient method. It is better to pass in a
1746 /// SmallVector/SmallString to the methods above to avoid thrashing the heap
1747 /// for the string.
1748 std::string toString(unsigned Radix, bool Signed) const;
1749
1750 /// \returns a byte-swapped representation of this APInt Value.
1751 APInt byteSwap() const;
1752
1753 /// \returns the value with the bit representation reversed of this APInt
1754 /// Value.
1755 APInt reverseBits() const;
1756
1757 /// Converts this APInt to a double value.
1758 double roundToDouble(bool isSigned) const;
1759
1760 /// Converts this unsigned APInt to a double value.
1761 double roundToDouble() const { return roundToDouble(false); }
1762
1763 /// Converts this signed APInt to a double value.
1764 double signedRoundToDouble() const { return roundToDouble(true); }
1765
1766 /// Converts APInt bits to a double
1767 ///
1768 /// The conversion does not do a translation from integer to double, it just
1769 /// re-interprets the bits as a double. Note that it is valid to do this on
1770 /// any bit width. Exactly 64 bits will be translated.
1771 double bitsToDouble() const {
1772 return BitsToDouble(getWord(0));
1773 }
1774
1775 /// Converts APInt bits to a float
1776 ///
1777 /// The conversion does not do a translation from integer to float, it just
1778 /// re-interprets the bits as a float. Note that it is valid to do this on
1779 /// any bit width. Exactly 32 bits will be translated.
1780 float bitsToFloat() const {
1781 return BitsToFloat(static_cast<uint32_t>(getWord(0)));
1782 }
1783
1784 /// Converts a double to APInt bits.
1785 ///
1786 /// The conversion does not do a translation from double to integer, it just
1787 /// re-interprets the bits of the double.
1788 static APInt doubleToBits(double V) {
1789 return APInt(sizeof(double) * CHAR_BIT8, DoubleToBits(V));
1790 }
1791
1792 /// Converts a float to APInt bits.
1793 ///
1794 /// The conversion does not do a translation from float to integer, it just
1795 /// re-interprets the bits of the float.
1796 static APInt floatToBits(float V) {
1797 return APInt(sizeof(float) * CHAR_BIT8, FloatToBits(V));
1798 }
1799
1800 /// @}
1801 /// \name Mathematics Operations
1802 /// @{
1803
1804 /// \returns the floor log base 2 of this APInt.
1805 unsigned logBase2() const { return getActiveBits() - 1; }
1806
1807 /// \returns the ceil log base 2 of this APInt.
1808 unsigned ceilLogBase2() const {
1809 APInt temp(*this);
1810 --temp;
1811 return temp.getActiveBits();
1812 }
1813
1814 /// \returns the nearest log base 2 of this APInt. Ties round up.
1815 ///
1816 /// NOTE: When we have a BitWidth of 1, we define:
1817 ///
1818 /// log2(0) = UINT32_MAX
1819 /// log2(1) = 0
1820 ///
1821 /// to get around any mathematical concerns resulting from
1822 /// referencing 2 in a space where 2 does no exist.
1823 unsigned nearestLogBase2() const {
1824 // Special case when we have a bitwidth of 1. If VAL is 1, then we
1825 // get 0. If VAL is 0, we get WORDTYPE_MAX which gets truncated to
1826 // UINT32_MAX.
1827 if (BitWidth == 1)
1828 return U.VAL - 1;
1829
1830 // Handle the zero case.
1831 if (isNullValue())
1832 return UINT32_MAX(4294967295U);
1833
1834 // The non-zero case is handled by computing:
1835 //
1836 // nearestLogBase2(x) = logBase2(x) + x[logBase2(x)-1].
1837 //
1838 // where x[i] is referring to the value of the ith bit of x.
1839 unsigned lg = logBase2();
1840 return lg + unsigned((*this)[lg - 1]);
1841 }
1842
1843 /// \returns the log base 2 of this APInt if its an exact power of two, -1
1844 /// otherwise
1845 int32_t exactLogBase2() const {
1846 if (!isPowerOf2())
1847 return -1;
1848 return logBase2();
1849 }
1850
1851 /// Compute the square root
1852 APInt sqrt() const;
1853
1854 /// Get the absolute value;
1855 ///
1856 /// If *this is < 0 then return -(*this), otherwise *this;
1857 APInt abs() const {
1858 if (isNegative())
1859 return -(*this);
1860 return *this;
1861 }
1862
1863 /// \returns the multiplicative inverse for a given modulo.
1864 APInt multiplicativeInverse(const APInt &modulo) const;
1865
1866 /// @}
1867 /// \name Support for division by constant
1868 /// @{
1869
1870 /// Calculate the magic number for signed division by a constant.
1871 struct ms;
1872 ms magic() const;
1873
1874 /// Calculate the magic number for unsigned division by a constant.
1875 struct mu;
1876 mu magicu(unsigned LeadingZeros = 0) const;
1877
1878 /// @}
1879 /// \name Building-block Operations for APInt and APFloat
1880 /// @{
1881
1882 // These building block operations operate on a representation of arbitrary
1883 // precision, two's-complement, bignum integer values. They should be
1884 // sufficient to implement APInt and APFloat bignum requirements. Inputs are
1885 // generally a pointer to the base of an array of integer parts, representing
1886 // an unsigned bignum, and a count of how many parts there are.
1887
1888 /// Sets the least significant part of a bignum to the input value, and zeroes
1889 /// out higher parts.
1890 static void tcSet(WordType *, WordType, unsigned);
1891
1892 /// Assign one bignum to another.
1893 static void tcAssign(WordType *, const WordType *, unsigned);
1894
1895 /// Returns true if a bignum is zero, false otherwise.
1896 static bool tcIsZero(const WordType *, unsigned);
1897
1898 /// Extract the given bit of a bignum; returns 0 or 1. Zero-based.
1899 static int tcExtractBit(const WordType *, unsigned bit);
1900
1901 /// Copy the bit vector of width srcBITS from SRC, starting at bit srcLSB, to
1902 /// DST, of dstCOUNT parts, such that the bit srcLSB becomes the least
1903 /// significant bit of DST. All high bits above srcBITS in DST are
1904 /// zero-filled.
1905 static void tcExtract(WordType *, unsigned dstCount,
1906 const WordType *, unsigned srcBits,
1907 unsigned srcLSB);
1908
1909 /// Set the given bit of a bignum. Zero-based.
1910 static void tcSetBit(WordType *, unsigned bit);
1911
1912 /// Clear the given bit of a bignum. Zero-based.
1913 static void tcClearBit(WordType *, unsigned bit);
1914
1915 /// Returns the bit number of the least or most significant set bit of a
1916 /// number. If the input number has no bits set -1U is returned.
1917 static unsigned tcLSB(const WordType *, unsigned n);
1918 static unsigned tcMSB(const WordType *parts, unsigned n);
1919
1920 /// Negate a bignum in-place.
1921 static void tcNegate(WordType *, unsigned);
1922
1923 /// DST += RHS + CARRY where CARRY is zero or one. Returns the carry flag.
1924 static WordType tcAdd(WordType *, const WordType *,
1925 WordType carry, unsigned);
1926 /// DST += RHS. Returns the carry flag.
1927 static WordType tcAddPart(WordType *, WordType, unsigned);
1928
1929 /// DST -= RHS + CARRY where CARRY is zero or one. Returns the carry flag.
1930 static WordType tcSubtract(WordType *, const WordType *,
1931 WordType carry, unsigned);
1932 /// DST -= RHS. Returns the carry flag.
1933 static WordType tcSubtractPart(WordType *, WordType, unsigned);
1934
1935 /// DST += SRC * MULTIPLIER + PART if add is true
1936 /// DST = SRC * MULTIPLIER + PART if add is false
1937 ///
1938 /// Requires 0 <= DSTPARTS <= SRCPARTS + 1. If DST overlaps SRC they must
1939 /// start at the same point, i.e. DST == SRC.
1940 ///
1941 /// If DSTPARTS == SRC_PARTS + 1 no overflow occurs and zero is returned.
1942 /// Otherwise DST is filled with the least significant DSTPARTS parts of the
1943 /// result, and if all of the omitted higher parts were zero return zero,
1944 /// otherwise overflow occurred and return one.
1945 static int tcMultiplyPart(WordType *dst, const WordType *src,
1946 WordType multiplier, WordType carry,
1947 unsigned srcParts, unsigned dstParts,
1948 bool add);
1949
1950 /// DST = LHS * RHS, where DST has the same width as the operands and is
1951 /// filled with the least significant parts of the result. Returns one if
1952 /// overflow occurred, otherwise zero. DST must be disjoint from both
1953 /// operands.
1954 static int tcMultiply(WordType *, const WordType *, const WordType *,
1955 unsigned);
1956
1957 /// DST = LHS * RHS, where DST has width the sum of the widths of the
1958 /// operands. No overflow occurs. DST must be disjoint from both operands.
1959 static void tcFullMultiply(WordType *, const WordType *,
1960 const WordType *, unsigned, unsigned);
1961
1962 /// If RHS is zero LHS and REMAINDER are left unchanged, return one.
1963 /// Otherwise set LHS to LHS / RHS with the fractional part discarded, set
1964 /// REMAINDER to the remainder, return zero. i.e.
1965 ///
1966 /// OLD_LHS = RHS * LHS + REMAINDER
1967 ///
1968 /// SCRATCH is a bignum of the same size as the operands and result for use by
1969 /// the routine; its contents need not be initialized and are destroyed. LHS,
1970 /// REMAINDER and SCRATCH must be distinct.
1971 static int tcDivide(WordType *lhs, const WordType *rhs,
1972 WordType *remainder, WordType *scratch,
1973 unsigned parts);
1974
1975 /// Shift a bignum left Count bits. Shifted in bits are zero. There are no
1976 /// restrictions on Count.
1977 static void tcShiftLeft(WordType *, unsigned Words, unsigned Count);
1978
1979 /// Shift a bignum right Count bits. Shifted in bits are zero. There are no
1980 /// restrictions on Count.
1981 static void tcShiftRight(WordType *, unsigned Words, unsigned Count);
1982
1983 /// The obvious AND, OR and XOR and complement operations.
1984 static void tcAnd(WordType *, const WordType *, unsigned);
1985 static void tcOr(WordType *, const WordType *, unsigned);
1986 static void tcXor(WordType *, const WordType *, unsigned);
1987 static void tcComplement(WordType *, unsigned);
1988
1989 /// Comparison (unsigned) of two bignums.
1990 static int tcCompare(const WordType *, const WordType *, unsigned);
1991
1992 /// Increment a bignum in-place. Return the carry flag.
1993 static WordType tcIncrement(WordType *dst, unsigned parts) {
1994 return tcAddPart(dst, 1, parts);
1995 }
1996
1997 /// Decrement a bignum in-place. Return the borrow flag.
1998 static WordType tcDecrement(WordType *dst, unsigned parts) {
1999 return tcSubtractPart(dst, 1, parts);
2000 }
2001
2002 /// Set the least significant BITS and clear the rest.
2003 static void tcSetLeastSignificantBits(WordType *, unsigned, unsigned bits);
2004
2005 /// debug method
2006 void dump() const;
2007
2008 /// @}
2009};
2010
2011/// Magic data for optimising signed division by a constant.
2012struct APInt::ms {
2013 APInt m; ///< magic number
2014 unsigned s; ///< shift amount
2015};
2016
2017/// Magic data for optimising unsigned division by a constant.
2018struct APInt::mu {
2019 APInt m; ///< magic number
2020 bool a; ///< add indicator
2021 unsigned s; ///< shift amount
2022};
2023
2024inline bool operator==(uint64_t V1, const APInt &V2) { return V2 == V1; }
2025
2026inline bool operator!=(uint64_t V1, const APInt &V2) { return V2 != V1; }
2027
2028/// Unary bitwise complement operator.
2029///
2030/// \returns an APInt that is the bitwise complement of \p v.
2031inline APInt operator~(APInt v) {
2032 v.flipAllBits();
2033 return v;
2034}
2035
2036inline APInt operator&(APInt a, const APInt &b) {
2037 a &= b;
2038 return a;
2039}
2040
2041inline APInt operator&(const APInt &a, APInt &&b) {
2042 b &= a;
2043 return std::move(b);
2044}
2045
2046inline APInt operator&(APInt a, uint64_t RHS) {
2047 a &= RHS;
2048 return a;
2049}
2050
2051inline APInt operator&(uint64_t LHS, APInt b) {
2052 b &= LHS;
2053 return b;
2054}
2055
2056inline APInt operator|(APInt a, const APInt &b) {
2057 a |= b;
2058 return a;
2059}
2060
2061inline APInt operator|(const APInt &a, APInt &&b) {
2062 b |= a;
2063 return std::move(b);
2064}
2065
2066inline APInt operator|(APInt a, uint64_t RHS) {
2067 a |= RHS;
2068 return a;
2069}
2070
2071inline APInt operator|(uint64_t LHS, APInt b) {
2072 b |= LHS;
2073 return b;
2074}
2075
2076inline APInt operator^(APInt a, const APInt &b) {
2077 a ^= b;
2078 return a;
2079}
2080
2081inline APInt operator^(const APInt &a, APInt &&b) {
2082 b ^= a;
2083 return std::move(b);
2084}
2085
2086inline APInt operator^(APInt a, uint64_t RHS) {
2087 a ^= RHS;
2088 return a;
2089}
2090
2091inline APInt operator^(uint64_t LHS, APInt b) {
2092 b ^= LHS;
2093 return b;
2094}
2095
2096inline raw_ostream &operator<<(raw_ostream &OS, const APInt &I) {
2097 I.print(OS, true);
2098 return OS;
2099}
2100
2101inline APInt operator-(APInt v) {
2102 v.negate();
2103 return v;
2104}
2105
2106inline APInt operator+(APInt a, const APInt &b) {
2107 a += b;
43
Calling 'APInt::operator+='
2108 return a;
2109}
2110
2111inline APInt operator+(const APInt &a, APInt &&b) {
2112 b += a;
2113 return std::move(b);
2114}
2115
2116inline APInt operator+(APInt a, uint64_t RHS) {
2117 a += RHS;
2118 return a;
2119}
2120
2121inline APInt operator+(uint64_t LHS, APInt b) {
2122 b += LHS;
2123 return b;
2124}
2125
2126inline APInt operator-(APInt a, const APInt &b) {
2127 a -= b;
2128 return a;
2129}
2130
2131inline APInt operator-(const APInt &a, APInt &&b) {
2132 b.negate();
2133 b += a;
2134 return std::move(b);
2135}
2136
2137inline APInt operator-(APInt a, uint64_t RHS) {
2138 a -= RHS;
2139 return a;
2140}
2141
2142inline APInt operator-(uint64_t LHS, APInt b) {
2143 b.negate();
2144 b += LHS;
2145 return b;
2146}
2147
2148inline APInt operator*(APInt a, uint64_t RHS) {
2149 a *= RHS;
2150 return a;
2151}
2152
2153inline APInt operator*(uint64_t LHS, APInt b) {
2154 b *= LHS;
2155 return b;
2156}
2157
2158
2159namespace APIntOps {
2160
2161/// Determine the smaller of two APInts considered to be signed.
2162inline const APInt &smin(const APInt &A, const APInt &B) {
2163 return A.slt(B) ? A : B;
2164}
2165
2166/// Determine the larger of two APInts considered to be signed.
2167inline const APInt &smax(const APInt &A, const APInt &B) {
2168 return A.sgt(B) ? A : B;
2169}
2170
2171/// Determine the smaller of two APInts considered to be signed.
2172inline const APInt &umin(const APInt &A, const APInt &B) {
2173 return A.ult(B) ? A : B;
2174}
2175
2176/// Determine the larger of two APInts considered to be unsigned.
2177inline const APInt &umax(const APInt &A, const APInt &B) {
2178 return A.ugt(B) ? A : B;
2179}
2180
2181/// Compute GCD of two unsigned APInt values.
2182///
2183/// This function returns the greatest common divisor of the two APInt values
2184/// using Stein's algorithm.
2185///
2186/// \returns the greatest common divisor of A and B.
2187APInt GreatestCommonDivisor(APInt A, APInt B);
2188
2189/// Converts the given APInt to a double value.
2190///
2191/// Treats the APInt as an unsigned value for conversion purposes.
2192inline double RoundAPIntToDouble(const APInt &APIVal) {
2193 return APIVal.roundToDouble();
2194}
2195
2196/// Converts the given APInt to a double value.
2197///
2198/// Treats the APInt as a signed value for conversion purposes.
2199inline double RoundSignedAPIntToDouble(const APInt &APIVal) {
2200 return APIVal.signedRoundToDouble();
2201}
2202
2203/// Converts the given APInt to a float vlalue.
2204inline float RoundAPIntToFloat(const APInt &APIVal) {
2205 return float(RoundAPIntToDouble(APIVal));
2206}
2207
2208/// Converts the given APInt to a float value.
2209///
2210/// Treats the APInt as a signed value for conversion purposes.
2211inline float RoundSignedAPIntToFloat(const APInt &APIVal) {
2212 return float(APIVal.signedRoundToDouble());
2213}
2214
2215/// Converts the given double value into a APInt.
2216///
2217/// This function convert a double value to an APInt value.
2218APInt RoundDoubleToAPInt(double Double, unsigned width);
2219
2220/// Converts a float value into a APInt.
2221///
2222/// Converts a float value into an APInt value.
2223inline APInt RoundFloatToAPInt(float Float, unsigned width) {
2224 return RoundDoubleToAPInt(double(Float), width);
2225}
2226
2227/// Return A unsign-divided by B, rounded by the given rounding mode.
2228APInt RoundingUDiv(const APInt &A, const APInt &B, APInt::Rounding RM);
2229
2230/// Return A sign-divided by B, rounded by the given rounding mode.
2231APInt RoundingSDiv(const APInt &A, const APInt &B, APInt::Rounding RM);
2232
2233/// Let q(n) = An^2 + Bn + C, and BW = bit width of the value range
2234/// (e.g. 32 for i32).
2235/// This function finds the smallest number n, such that
2236/// (a) n >= 0 and q(n) = 0, or
2237/// (b) n >= 1 and q(n-1) and q(n), when evaluated in the set of all
2238/// integers, belong to two different intervals [Rk, Rk+R),
2239/// where R = 2^BW, and k is an integer.
2240/// The idea here is to find when q(n) "overflows" 2^BW, while at the
2241/// same time "allowing" subtraction. In unsigned modulo arithmetic a
2242/// subtraction (treated as addition of negated numbers) would always
2243/// count as an overflow, but here we want to allow values to decrease
2244/// and increase as long as they are within the same interval.
2245/// Specifically, adding of two negative numbers should not cause an
2246/// overflow (as long as the magnitude does not exceed the bit width).
2247/// On the other hand, given a positive number, adding a negative
2248/// number to it can give a negative result, which would cause the
2249/// value to go from [-2^BW, 0) to [0, 2^BW). In that sense, zero is
2250/// treated as a special case of an overflow.
2251///
2252/// This function returns None if after finding k that minimizes the
2253/// positive solution to q(n) = kR, both solutions are contained between
2254/// two consecutive integers.
2255///
2256/// There are cases where q(n) > T, and q(n+1) < T (assuming evaluation
2257/// in arithmetic modulo 2^BW, and treating the values as signed) by the
2258/// virtue of *signed* overflow. This function will *not* find such an n,
2259/// however it may find a value of n satisfying the inequalities due to
2260/// an *unsigned* overflow (if the values are treated as unsigned).
2261/// To find a solution for a signed overflow, treat it as a problem of
2262/// finding an unsigned overflow with a range with of BW-1.
2263///
2264/// The returned value may have a different bit width from the input
2265/// coefficients.
2266Optional<APInt> SolveQuadraticEquationWrap(APInt A, APInt B, APInt C,
2267 unsigned RangeWidth);
2268
2269/// Compare two values, and if they are different, return the position of the
2270/// most significant bit that is different in the values.
2271Optional<unsigned> GetMostSignificantDifferentBit(const APInt &A,
2272 const APInt &B);
2273
2274} // End of APIntOps namespace
2275
2276// See friend declaration above. This additional declaration is required in
2277// order to compile LLVM with IBM xlC compiler.
2278hash_code hash_value(const APInt &Arg);
2279
2280/// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
2281/// with the integer held in IntVal.
2282void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst, unsigned StoreBytes);
2283
2284/// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
2285/// from Src into IntVal, which is assumed to be wide enough and to hold zero.
2286void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes);
2287
2288} // namespace llvm
2289
2290#endif