Bug Summary

File:llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
Warning:line 67, column 23
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name LowerExpectIntrinsic.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 -fhalf-no-semantic-interposition -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-12/lib/clang/12.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/build-llvm/lib/Transforms/Scalar -I /build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Transforms/Scalar -I /build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/build-llvm/include -I /build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/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-12/lib/clang/12.0.0/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-12~++20210124100612+2afaf072f5c1/build-llvm/lib/Transforms/Scalar -fdebug-prefix-map=/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2021-01-24-223304-31662-1 -x c++ /build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
1//===- LowerExpectIntrinsic.cpp - Lower expect intrinsic ------------------===//
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 pass lowers the 'expect' intrinsic to LLVM metadata.
10//
11//===----------------------------------------------------------------------===//
12
13#include "llvm/Transforms/Scalar/LowerExpectIntrinsic.h"
14#include "llvm/ADT/SmallVector.h"
15#include "llvm/ADT/Statistic.h"
16#include "llvm/ADT/iterator_range.h"
17#include "llvm/IR/BasicBlock.h"
18#include "llvm/IR/Constants.h"
19#include "llvm/IR/Function.h"
20#include "llvm/IR/Instructions.h"
21#include "llvm/IR/Intrinsics.h"
22#include "llvm/IR/LLVMContext.h"
23#include "llvm/IR/MDBuilder.h"
24#include "llvm/IR/Metadata.h"
25#include "llvm/InitializePasses.h"
26#include "llvm/Pass.h"
27#include "llvm/Support/Debug.h"
28#include "llvm/Transforms/Scalar.h"
29
30using namespace llvm;
31
32#define DEBUG_TYPE"lower-expect-intrinsic" "lower-expect-intrinsic"
33
34STATISTIC(ExpectIntrinsicsHandled,static llvm::Statistic ExpectIntrinsicsHandled = {"lower-expect-intrinsic"
, "ExpectIntrinsicsHandled", "Number of 'expect' intrinsic instructions handled"
}
35 "Number of 'expect' intrinsic instructions handled")static llvm::Statistic ExpectIntrinsicsHandled = {"lower-expect-intrinsic"
, "ExpectIntrinsicsHandled", "Number of 'expect' intrinsic instructions handled"
};
36
37// These default values are chosen to represent an extremely skewed outcome for
38// a condition, but they leave some room for interpretation by later passes.
39//
40// If the documentation for __builtin_expect() was made explicit that it should
41// only be used in extreme cases, we could make this ratio higher. As it stands,
42// programmers may be using __builtin_expect() / llvm.expect to annotate that a
43// branch is likely or unlikely to be taken.
44//
45// There is a known dependency on this ratio in CodeGenPrepare when transforming
46// 'select' instructions. It may be worthwhile to hoist these values to some
47// shared space, so they can be used directly by other passes.
48
49cl::opt<uint32_t> llvm::LikelyBranchWeight(
50 "likely-branch-weight", cl::Hidden, cl::init(2000),
51 cl::desc("Weight of the branch likely to be taken (default = 2000)"));
52cl::opt<uint32_t> llvm::UnlikelyBranchWeight(
53 "unlikely-branch-weight", cl::Hidden, cl::init(1),
54 cl::desc("Weight of the branch unlikely to be taken (default = 1)"));
55
56static std::tuple<uint32_t, uint32_t>
57getBranchWeight(Intrinsic::ID IntrinsicID, CallInst *CI, int BranchCount) {
58 if (IntrinsicID == Intrinsic::expect) {
16
←
Assuming 'IntrinsicID' is not equal to expect
→
17
←
Taking false branch
→
59 // __builtin_expect
60 return std::make_tuple(LikelyBranchWeight.getValue(),
61 UnlikelyBranchWeight.getValue());
62 } else {
63 // __builtin_expect_with_probability
64 assert(CI->getNumOperands() >= 3 &&((CI->getNumOperands() >= 3 && "expect with probability must have 3 arguments"
) ? static_cast<void> (0) : __assert_fail ("CI->getNumOperands() >= 3 && \"expect with probability must have 3 arguments\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp"
, 65, __PRETTY_FUNCTION__))
18
←
Assuming the condition is true
→
19
←
'?' condition is true
→
65 "expect with probability must have 3 arguments")((CI->getNumOperands() >= 3 && "expect with probability must have 3 arguments"
) ? static_cast<void> (0) : __assert_fail ("CI->getNumOperands() >= 3 && \"expect with probability must have 3 arguments\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp"
, 65, __PRETTY_FUNCTION__));
66 ConstantFP *Confidence = dyn_cast<ConstantFP>(CI->getArgOperand(2));
20
←
Assuming the object is not a 'ConstantFP'
→
21
←
'Confidence' initialized to a null pointer value
→
67 double TrueProb = Confidence->getValueAPF().convertToDouble();
22
←
Called C++ object pointer is null
68 assert((TrueProb >= 0.0 && TrueProb <= 1.0) &&(((TrueProb >= 0.0 && TrueProb <= 1.0) &&
"probability value must be in the range [0.0, 1.0]") ? static_cast
<void> (0) : __assert_fail ("(TrueProb >= 0.0 && TrueProb <= 1.0) && \"probability value must be in the range [0.0, 1.0]\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp"
, 69, __PRETTY_FUNCTION__))
69 "probability value must be in the range [0.0, 1.0]")(((TrueProb >= 0.0 && TrueProb <= 1.0) &&
"probability value must be in the range [0.0, 1.0]") ? static_cast
<void> (0) : __assert_fail ("(TrueProb >= 0.0 && TrueProb <= 1.0) && \"probability value must be in the range [0.0, 1.0]\""
, "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp"
, 69, __PRETTY_FUNCTION__));
70 double FalseProb = (1.0 - TrueProb) / (BranchCount - 1);
71 uint32_t LikelyBW = ceil((TrueProb * (double)(INT32_MAX(2147483647) - 1)) + 1.0);
72 uint32_t UnlikelyBW = ceil((FalseProb * (double)(INT32_MAX(2147483647) - 1)) + 1.0);
73 return std::make_tuple(LikelyBW, UnlikelyBW);
74 }
75}
76
77static bool handleSwitchExpect(SwitchInst &SI) {
78 CallInst *CI = dyn_cast<CallInst>(SI.getCondition());
79 if (!CI)
80 return false;
81
82 Function *Fn = CI->getCalledFunction();
83 if (!Fn || (Fn->getIntrinsicID() != Intrinsic::expect &&
84 Fn->getIntrinsicID() != Intrinsic::expect_with_probability))
85 return false;
86
87 Value *ArgValue = CI->getArgOperand(0);
88 ConstantInt *ExpectedValue = dyn_cast<ConstantInt>(CI->getArgOperand(1));
89 if (!ExpectedValue)
90 return false;
91
92 SwitchInst::CaseHandle Case = *SI.findCaseValue(ExpectedValue);
93 unsigned n = SI.getNumCases(); // +1 for default case.
94 uint32_t LikelyBranchWeightVal, UnlikelyBranchWeightVal;
95 std::tie(LikelyBranchWeightVal, UnlikelyBranchWeightVal) =
96 getBranchWeight(Fn->getIntrinsicID(), CI, n + 1);
97
98 SmallVector<uint32_t, 16> Weights(n + 1, UnlikelyBranchWeightVal);
99
100 uint64_t Index = (Case == *SI.case_default()) ? 0 : Case.getCaseIndex() + 1;
101 Weights[Index] = LikelyBranchWeightVal;
102
103 SI.setCondition(ArgValue);
104
105 SI.setMetadata(LLVMContext::MD_prof,
106 MDBuilder(CI->getContext()).createBranchWeights(Weights));
107
108 return true;
109}
110
111/// Handler for PHINodes that define the value argument to an
112/// @llvm.expect call.
113///
114/// If the operand of the phi has a constant value and it 'contradicts'
115/// with the expected value of phi def, then the corresponding incoming
116/// edge of the phi is unlikely to be taken. Using that information,
117/// the branch probability info for the originating branch can be inferred.
118static void handlePhiDef(CallInst *Expect) {
119 Value &Arg = *Expect->getArgOperand(0);
120 ConstantInt *ExpectedValue = dyn_cast<ConstantInt>(Expect->getArgOperand(1));
121 if (!ExpectedValue)
122 return;
123 const APInt &ExpectedPhiValue = ExpectedValue->getValue();
124
125 // Walk up in backward a list of instructions that
126 // have 'copy' semantics by 'stripping' the copies
127 // until a PHI node or an instruction of unknown kind
128 // is reached. Negation via xor is also handled.
129 //
130 // C = PHI(...);
131 // B = C;
132 // A = B;
133 // D = __builtin_expect(A, 0);
134 //
135 Value *V = &Arg;
136 SmallVector<Instruction *, 4> Operations;
137 while (!isa<PHINode>(V)) {
138 if (ZExtInst *ZExt = dyn_cast<ZExtInst>(V)) {
139 V = ZExt->getOperand(0);
140 Operations.push_back(ZExt);
141 continue;
142 }
143
144 if (SExtInst *SExt = dyn_cast<SExtInst>(V)) {
145 V = SExt->getOperand(0);
146 Operations.push_back(SExt);
147 continue;
148 }
149
150 BinaryOperator *BinOp = dyn_cast<BinaryOperator>(V);
151 if (!BinOp || BinOp->getOpcode() != Instruction::Xor)
152 return;
153
154 ConstantInt *CInt = dyn_cast<ConstantInt>(BinOp->getOperand(1));
155 if (!CInt)
156 return;
157
158 V = BinOp->getOperand(0);
159 Operations.push_back(BinOp);
160 }
161
162 // Executes the recorded operations on input 'Value'.
163 auto ApplyOperations = [&](const APInt &Value) {
164 APInt Result = Value;
165 for (auto Op : llvm::reverse(Operations)) {
166 switch (Op->getOpcode()) {
167 case Instruction::Xor:
168 Result ^= cast<ConstantInt>(Op->getOperand(1))->getValue();
169 break;
170 case Instruction::ZExt:
171 Result = Result.zext(Op->getType()->getIntegerBitWidth());
172 break;
173 case Instruction::SExt:
174 Result = Result.sext(Op->getType()->getIntegerBitWidth());
175 break;
176 default:
177 llvm_unreachable("Unexpected operation")::llvm::llvm_unreachable_internal("Unexpected operation", "/build/llvm-toolchain-snapshot-12~++20210124100612+2afaf072f5c1/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp"
, 177);
178 }
179 }
180 return Result;
181 };
182
183 auto *PhiDef = cast<PHINode>(V);
184
185 // Get the first dominating conditional branch of the operand
186 // i's incoming block.
187 auto GetDomConditional = [&](unsigned i) -> BranchInst * {
188 BasicBlock *BB = PhiDef->getIncomingBlock(i);
189 BranchInst *BI = dyn_cast<BranchInst>(BB->getTerminator());
190 if (BI && BI->isConditional())
191 return BI;
192 BB = BB->getSinglePredecessor();
193 if (!BB)
194 return nullptr;
195 BI = dyn_cast<BranchInst>(BB->getTerminator());
196 if (!BI || BI->isUnconditional())
197 return nullptr;
198 return BI;
199 };
200
201 // Now walk through all Phi operands to find phi oprerands with values
202 // conflicting with the expected phi output value. Any such operand
203 // indicates the incoming edge to that operand is unlikely.
204 for (unsigned i = 0, e = PhiDef->getNumIncomingValues(); i != e; ++i) {
205
206 Value *PhiOpnd = PhiDef->getIncomingValue(i);
207 ConstantInt *CI = dyn_cast<ConstantInt>(PhiOpnd);
208 if (!CI)
209 continue;
210
211 // Not an interesting case when IsUnlikely is false -- we can not infer
212 // anything useful when the operand value matches the expected phi
213 // output.
214 if (ExpectedPhiValue == ApplyOperations(CI->getValue()))
215 continue;
216
217 BranchInst *BI = GetDomConditional(i);
218 if (!BI)
219 continue;
220
221 MDBuilder MDB(PhiDef->getContext());
222
223 // There are two situations in which an operand of the PhiDef comes
224 // from a given successor of a branch instruction BI.
225 // 1) When the incoming block of the operand is the successor block;
226 // 2) When the incoming block is BI's enclosing block and the
227 // successor is the PhiDef's enclosing block.
228 //
229 // Returns true if the operand which comes from OpndIncomingBB
230 // comes from outgoing edge of BI that leads to Succ block.
231 auto *OpndIncomingBB = PhiDef->getIncomingBlock(i);
232 auto IsOpndComingFromSuccessor = [&](BasicBlock *Succ) {
233 if (OpndIncomingBB == Succ)
234 // If this successor is the incoming block for this
235 // Phi operand, then this successor does lead to the Phi.
236 return true;
237 if (OpndIncomingBB == BI->getParent() && Succ == PhiDef->getParent())
238 // Otherwise, if the edge is directly from the branch
239 // to the Phi, this successor is the one feeding this
240 // Phi operand.
241 return true;
242 return false;
243 };
244 uint32_t LikelyBranchWeightVal, UnlikelyBranchWeightVal;
245 std::tie(LikelyBranchWeightVal, UnlikelyBranchWeightVal) = getBranchWeight(
246 Expect->getCalledFunction()->getIntrinsicID(), Expect, 2);
247
248 if (IsOpndComingFromSuccessor(BI->getSuccessor(1)))
249 BI->setMetadata(LLVMContext::MD_prof,
250 MDB.createBranchWeights(LikelyBranchWeightVal,
251 UnlikelyBranchWeightVal));
252 else if (IsOpndComingFromSuccessor(BI->getSuccessor(0)))
253 BI->setMetadata(LLVMContext::MD_prof,
254 MDB.createBranchWeights(UnlikelyBranchWeightVal,
255 LikelyBranchWeightVal));
256 }
257}
258
259// Handle both BranchInst and SelectInst.
260template <class BrSelInst> static bool handleBrSelExpect(BrSelInst &BSI) {
261
262 // Handle non-optimized IR code like:
263 // %expval = call i64 @llvm.expect.i64(i64 %conv1, i64 1)
264 // %tobool = icmp ne i64 %expval, 0
265 // br i1 %tobool, label %if.then, label %if.end
266 //
267 // Or the following simpler case:
268 // %expval = call i1 @llvm.expect.i1(i1 %cmp, i1 1)
269 // br i1 %expval, label %if.then, label %if.end
270
271 CallInst *CI;
272
273 ICmpInst *CmpI = dyn_cast<ICmpInst>(BSI.getCondition());
7
←
Assuming the object is not a 'ICmpInst'
→
274 CmpInst::Predicate Predicate;
275 ConstantInt *CmpConstOperand = nullptr;
276 if (!CmpI
7.1
'CmpI' is null
) {
8
←
Taking true branch
→
277 CI = dyn_cast<CallInst>(BSI.getCondition());
9
←
Assuming the object is a 'CallInst'
→
278 Predicate = CmpInst::ICMP_NE;
279 } else {
280 Predicate = CmpI->getPredicate();
281 if (Predicate != CmpInst::ICMP_NE && Predicate != CmpInst::ICMP_EQ)
282 return false;
283
284 CmpConstOperand = dyn_cast<ConstantInt>(CmpI->getOperand(1));
285 if (!CmpConstOperand)
286 return false;
287 CI = dyn_cast<CallInst>(CmpI->getOperand(0));
288 }
289
290 if (!CI
9.1
'CI' is non-null
)
10
←
Taking false branch
→
291 return false;
292
293 uint64_t ValueComparedTo = 0;
294 if (CmpConstOperand
10.1
'CmpConstOperand' is null
) {
11
←
Taking false branch
→
295 if (CmpConstOperand->getBitWidth() > 64)
296 return false;
297 ValueComparedTo = CmpConstOperand->getZExtValue();
298 }
299
300 Function *Fn = CI->getCalledFunction();
301 if (!Fn
11.1
'Fn' is non-null
 || (Fn->getIntrinsicID() != Intrinsic::expect &&
12
←
Assuming the condition is false
→
302 Fn->getIntrinsicID() != Intrinsic::expect_with_probability))
303 return false;
304
305 Value *ArgValue = CI->getArgOperand(0);
306 ConstantInt *ExpectedValue = dyn_cast<ConstantInt>(CI->getArgOperand(1));
13
←
Assuming the object is a 'ConstantInt'
→
307 if (!ExpectedValue
13.1
'ExpectedValue' is non-null
)
14
←
Taking false branch
→
308 return false;
309
310 MDBuilder MDB(CI->getContext());
311 MDNode *Node;
312
313 uint32_t LikelyBranchWeightVal, UnlikelyBranchWeightVal;
314 std::tie(LikelyBranchWeightVal, UnlikelyBranchWeightVal) =
315 getBranchWeight(Fn->getIntrinsicID(), CI, 2);
15
←
Calling 'getBranchWeight'
→
316
317 if ((ExpectedValue->getZExtValue() == ValueComparedTo) ==
318 (Predicate == CmpInst::ICMP_EQ)) {
319 Node =
320 MDB.createBranchWeights(LikelyBranchWeightVal, UnlikelyBranchWeightVal);
321 } else {
322 Node =
323 MDB.createBranchWeights(UnlikelyBranchWeightVal, LikelyBranchWeightVal);
324 }
325
326 if (CmpI)
327 CmpI->setOperand(0, ArgValue);
328 else
329 BSI.setCondition(ArgValue);
330
331 BSI.setMetadata(LLVMContext::MD_prof, Node);
332
333 return true;
334}
335
336static bool handleBranchExpect(BranchInst &BI) {
337 if (BI.isUnconditional())
5
←
Taking false branch
→
338 return false;
339
340 return handleBrSelExpect<BranchInst>(BI);
6
←
Calling 'handleBrSelExpect<llvm::BranchInst>'
→
341}
342
343static bool lowerExpectIntrinsic(Function &F) {
344 bool Changed = false;
345
346 for (BasicBlock &BB : F) {
347 // Create "block_weights" metadata.
348 if (BranchInst *BI
2.1
'BI' is non-null
 = dyn_cast<BranchInst>(BB.getTerminator())) {
2
←
Assuming the object is a 'BranchInst'
→
3
←
Taking true branch
→
349 if (handleBranchExpect(*BI))
4
←
Calling 'handleBranchExpect'
→
350 ExpectIntrinsicsHandled++;
351 } else if (SwitchInst *SI = dyn_cast<SwitchInst>(BB.getTerminator())) {
352 if (handleSwitchExpect(*SI))
353 ExpectIntrinsicsHandled++;
354 }
355
356 // Remove llvm.expect intrinsics. Iterate backwards in order
357 // to process select instructions before the intrinsic gets
358 // removed.
359 for (auto BI = BB.rbegin(), BE = BB.rend(); BI != BE;) {
360 Instruction *Inst = &*BI++;
361 CallInst *CI = dyn_cast<CallInst>(Inst);
362 if (!CI) {
363 if (SelectInst *SI = dyn_cast<SelectInst>(Inst)) {
364 if (handleBrSelExpect(*SI))
365 ExpectIntrinsicsHandled++;
366 }
367 continue;
368 }
369
370 Function *Fn = CI->getCalledFunction();
371 if (Fn && (Fn->getIntrinsicID() == Intrinsic::expect ||
372 Fn->getIntrinsicID() == Intrinsic::expect_with_probability)) {
373 // Before erasing the llvm.expect, walk backward to find
374 // phi that define llvm.expect's first arg, and
375 // infer branch probability:
376 handlePhiDef(CI);
377 Value *Exp = CI->getArgOperand(0);
378 CI->replaceAllUsesWith(Exp);
379 CI->eraseFromParent();
380 Changed = true;
381 }
382 }
383 }
384
385 return Changed;
386}
387
388PreservedAnalyses LowerExpectIntrinsicPass::run(Function &F,
389 FunctionAnalysisManager &) {
390 if (lowerExpectIntrinsic(F))
391 return PreservedAnalyses::none();
392
393 return PreservedAnalyses::all();
394}
395
396namespace {
397/// Legacy pass for lowering expect intrinsics out of the IR.
398///
399/// When this pass is run over a function it uses expect intrinsics which feed
400/// branches and switches to provide branch weight metadata for those
401/// terminators. It then removes the expect intrinsics from the IR so the rest
402/// of the optimizer can ignore them.
403class LowerExpectIntrinsic : public FunctionPass {
404public:
405 static char ID;
406 LowerExpectIntrinsic() : FunctionPass(ID) {
407 initializeLowerExpectIntrinsicPass(*PassRegistry::getPassRegistry());
408 }
409
410 bool runOnFunction(Function &F) override { return lowerExpectIntrinsic(F); }
1
Calling 'lowerExpectIntrinsic'
→
411};
412}
413
414char LowerExpectIntrinsic::ID = 0;
415INITIALIZE_PASS(LowerExpectIntrinsic, "lower-expect",static void *initializeLowerExpectIntrinsicPassOnce(PassRegistry
&Registry) { PassInfo *PI = new PassInfo( "Lower 'expect' Intrinsics"
, "lower-expect", &LowerExpectIntrinsic::ID, PassInfo::NormalCtor_t
(callDefaultCtor<LowerExpectIntrinsic>), false, false);
Registry.registerPass(*PI, true); return PI; } static llvm::
once_flag InitializeLowerExpectIntrinsicPassFlag; void llvm::
initializeLowerExpectIntrinsicPass(PassRegistry &Registry
) { llvm::call_once(InitializeLowerExpectIntrinsicPassFlag, initializeLowerExpectIntrinsicPassOnce
, std::ref(Registry)); }
416 "Lower 'expect' Intrinsics", false, false)static void *initializeLowerExpectIntrinsicPassOnce(PassRegistry
&Registry) { PassInfo *PI = new PassInfo( "Lower 'expect' Intrinsics"
, "lower-expect", &LowerExpectIntrinsic::ID, PassInfo::NormalCtor_t
(callDefaultCtor<LowerExpectIntrinsic>), false, false);
Registry.registerPass(*PI, true); return PI; } static llvm::
once_flag InitializeLowerExpectIntrinsicPassFlag; void llvm::
initializeLowerExpectIntrinsicPass(PassRegistry &Registry
) { llvm::call_once(InitializeLowerExpectIntrinsicPassFlag, initializeLowerExpectIntrinsicPassOnce
, std::ref(Registry)); }
417
418FunctionPass *llvm::createLowerExpectIntrinsicPass() {
419 return new LowerExpectIntrinsic();
420}