LLVM 19.0.0git
Go to the documentation of this file.
1//===-- llvm/ADT/APSInt.cpp - Arbitrary Precision Signed Int ---*- C++ -*--===//
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
9// This file implements the APSInt class, which is a simple class that
10// represents an arbitrary sized integer that knows its signedness.
14#include "llvm/ADT/APSInt.h"
15#include "llvm/ADT/FoldingSet.h"
16#include "llvm/ADT/StringRef.h"
17#include <cassert>
19using namespace llvm;
22 assert(!Str.empty() && "Invalid string length");
24 // (Over-)estimate the required number of bits.
25 unsigned NumBits = ((Str.size() * 64) / 19) + 2;
26 APInt Tmp(NumBits, Str, /*radix=*/10);
27 if (Str[0] == '-') {
28 unsigned MinBits = Tmp.getSignificantBits();
29 if (MinBits < NumBits)
30 Tmp = Tmp.trunc(std::max<unsigned>(1, MinBits));
31 *this = APSInt(Tmp, /*isUnsigned=*/false);
32 return;
33 }
34 unsigned ActiveBits = Tmp.getActiveBits();
35 if (ActiveBits < NumBits)
36 Tmp = Tmp.trunc(std::max<unsigned>(1, ActiveBits));
37 *this = APSInt(Tmp, /*isUnsigned=*/true);
41 ID.AddInteger((unsigned) (IsUnsigned ? 1 : 0));
This file implements the APSInt class, which is a simple class that represents an arbitrary sized int...
This file defines a hash set that can be used to remove duplication of nodes in a graph.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
Class for arbitrary precision integers.
Definition: APInt.h:76
unsigned getActiveBits() const
Compute the number of active bits in the value.
Definition: APInt.h:1470
APInt trunc(unsigned width) const
Truncate to new width.
Definition: APInt.cpp:906
unsigned getSignificantBits() const
Get the minimum bit size for this signed APInt.
Definition: APInt.h:1489
void Profile(FoldingSetNodeID &id) const
Used to insert APInt objects, or objects that contain APInt objects, into FoldingSets.
Definition: APInt.cpp:155
void Profile(FoldingSetNodeID &ID) const
Used to insert APSInt objects, or objects that contain APSInt objects, into FoldingSets.
Definition: APSInt.cpp:40
Default constructor that creates an uninitialized APInt.
FoldingSetNodeID - This class is used to gather all the unique data bits of a node.
Definition: FoldingSet.h:319
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18