KnownBits.cpp File Reference

#include "llvm/Support/KnownBits.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>

Go to the source code of this file.

Functions
static KnownBits	computeForAddCarry (const KnownBits &LHS, const KnownBits &RHS, bool CarryZero, bool CarryOne)
static unsigned	getMaxShiftAmount (const APInt &MaxValue, unsigned BitWidth)
static KnownBits	computeForSatAddSub (bool Add, bool Signed, const KnownBits &LHS, const KnownBits &RHS)
static KnownBits	divComputeLowBit (KnownBits Known, const KnownBits &LHS, const KnownBits &RHS, bool Exact)

Function Documentation

computeForAddCarry()

static KnownBits computeForAddCarry ( const KnownBits &  LHS, const KnownBits &  RHS, bool  CarryZero, bool  CarryOne  )

static

Definition at line 21 of file KnownBits.cpp.

References assert(), LHS, llvm::move(), llvm::KnownBits::One, RHS, and llvm::KnownBits::Zero.

computeForSatAddSub()

static KnownBits computeForSatAddSub ( bool  Add, bool  Signed, const KnownBits &  LHS, const KnownBits &  RHS  )

static

Definition at line 603 of file KnownBits.cpp.

References llvm::Add, assert(), llvm::BitWidth, llvm::CallingConv::C, llvm::APInt::clearAllBits(), llvm::APInt::clearLowBits(), llvm::APInt::clearSignBit(), llvm::KnownBits::computeForAddSub(), llvm::KnownBits::getBitWidth(), llvm::APInt::getHighBitsSet(), llvm::APInt::getMaxValue(), llvm::APInt::getMinValue(), llvm::APInt::getSignedMaxValue(), llvm::APInt::getSignedMinValue(), llvm::KnownBits::hasConflict(), llvm::KnownBits::isNonNegative(), LHS, llvm::KnownBits::One, RHS, llvm::APInt::setSignBit(), Signed, and llvm::KnownBits::Zero.

Referenced by llvm::KnownBits::sadd_sat(), llvm::KnownBits::ssub_sat(), llvm::KnownBits::uadd_sat(), and llvm::KnownBits::usub_sat().

divComputeLowBit()

static KnownBits divComputeLowBit ( KnownBits  Known, const KnownBits &  LHS, const KnownBits &  RHS, bool  Exact  )

static

Definition at line 881 of file KnownBits.cpp.

References llvm::KnownBits::hasConflict(), LHS, llvm::KnownBits::One, RHS, llvm::KnownBits::setAllZero(), llvm::APInt::setBit(), llvm::APInt::setLowBits(), and llvm::KnownBits::Zero.

Referenced by llvm::KnownBits::sdiv(), and llvm::KnownBits::udiv().

getMaxShiftAmount()

static unsigned getMaxShiftAmount ( const APInt &  MaxValue, unsigned  BitWidth  )

static

Definition at line 272 of file KnownBits.cpp.

References llvm::BitWidth, llvm::APInt::extractBitsAsZExtValue(), llvm::APInt::getLimitedValue(), llvm::isPowerOf2_32(), and llvm::Log2_32().

Referenced by llvm::KnownBits::ashr(), llvm::KnownBits::lshr(), and llvm::KnownBits::shl().