GISelKnownBits.cpp File Reference

#include "llvm/CodeGen/GlobalISel/GISelKnownBits.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/GlobalISel/GenericMachineInstrs.h"
#include "llvm/CodeGen/GlobalISel/Utils.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetOpcodes.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/Target/TargetMachine.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "gisel-known-bits"
	Provides analysis for querying information about KnownBits during GISel passes.

Functions
	INITIALIZE_PASS (GISelKnownBitsAnalysis, DEBUG_TYPE, "Analysis for ComputingKnownBits", false, true) GISelKnownBits
static LLVM_ATTRIBUTE_UNUSED void	dumpResult (const MachineInstr &MI, const KnownBits &Known, unsigned Depth)
static KnownBits	extractBits (unsigned BitWidth, const KnownBits &SrcOpKnown, const KnownBits &OffsetKnown, const KnownBits &WidthKnown)
static unsigned	computeNumSignBitsFromRangeMetadata (const GAnyLoad *Ld, unsigned TyBits)
	Compute the known number of sign bits with attached range metadata in the memory operand.

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "gisel-known-bits"

Provides analysis for querying information about KnownBits during GISel passes.

Definition at line 25 of file GISelKnownBits.cpp.

Function Documentation

computeNumSignBitsFromRangeMetadata()

static unsigned computeNumSignBitsFromRangeMetadata ( const GAnyLoad *  Ld, unsigned  TyBits  )

static

Compute the known number of sign bits with attached range metadata in the memory operand.

If this is an extending load, accounts for the behavior of the high bits.

Definition at line 649 of file GISelKnownBits.cpp.

References llvm::ConstantRange::getBitWidth(), llvm::getConstantRangeFromMetadata(), llvm::APInt::getNumSignBits(), llvm::MachineInstr::getOpcode(), llvm::GAnyLoad::getRanges(), llvm::ConstantRange::getSignedMax(), llvm::ConstantRange::getSignedMin(), llvm::ConstantRange::signExtend(), and llvm::ConstantRange::zeroExtend().

Referenced by llvm::GISelKnownBits::computeNumSignBits().

dumpResult()

static LLVM_ATTRIBUTE_UNUSED void dumpResult ( const MachineInstr &  MI, const KnownBits &  Known, unsigned  Depth  )

static

Definition at line 100 of file GISelKnownBits.cpp.

References llvm::dbgs(), llvm::Depth, MI, llvm::KnownBits::One, llvm::toString(), and llvm::KnownBits::Zero.

Referenced by llvm::GISelKnownBits::computeKnownBitsImpl().

extractBits()

static KnownBits extractBits ( unsigned  BitWidth, const KnownBits &  SrcOpKnown, const KnownBits &  OffsetKnown, const KnownBits &  WidthKnown  )

static

Definition at line 132 of file GISelKnownBits.cpp.

References llvm::BitWidth, llvm::APInt::getBitsSetFrom(), llvm::APInt::getLimitedValue(), llvm::APInt::getLowBitsSet(), llvm::KnownBits::getMaxValue(), llvm::KnownBits::getMinValue(), and llvm::KnownBits::lshr().

INITIALIZE_PASS()

INITIALIZE_PASS	(	GISelKnownBitsAnalysis	,
		DEBUG_TYPE	,
		"Analysis for ComputingKnownBits"	,
		false	,
		true
	)

Definition at line 31 of file GISelKnownBits.cpp.