X86FixupVectorConstants.cpp File Reference

#include "X86.h"
#include "X86InstrFoldTables.h"
#include "X86InstrInfo.h"
#include "X86Subtarget.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineConstantPool.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "x86-fixup-vector-constants"

Functions
	STATISTIC (NumInstChanges, "Number of instructions changes")
static Constant *	getSplatValueAllowUndef (const ConstantVector *C)
	Normally, we only allow poison in vector splats.
static std::optional< APInt >	extractConstantBits (const Constant *C)
static std::optional< APInt >	extractConstantBits (const Constant *C, unsigned NumBits)
static std::optional< APInt >	getSplatableConstant (const Constant *C, unsigned SplatBitWidth)
static Constant *	rebuildConstant (LLVMContext &Ctx, Type *SclTy, const APInt &Bits, unsigned NumSclBits)
static Constant *	rebuildSplatCst (const Constant *C, unsigned, unsigned, unsigned SplatBitWidth)
static Constant *	rebuildZeroUpperCst (const Constant *C, unsigned NumBits, unsigned, unsigned ScalarBitWidth)
static Constant *	rebuildExtCst (const Constant *C, bool IsSExt, unsigned NumBits, unsigned NumElts, unsigned SrcEltBitWidth)
static Constant *	rebuildSExtCst (const Constant *C, unsigned NumBits, unsigned NumElts, unsigned SrcEltBitWidth)
static Constant *	rebuildZExtCst (const Constant *C, unsigned NumBits, unsigned NumElts, unsigned SrcEltBitWidth)

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "x86-fixup-vector-constants"

Definition at line 27 of file X86FixupVectorConstants.cpp.

Function Documentation

extractConstantBits() [1/2]

static std::optional< APInt > extractConstantBits ( const Constant *  C )

static

Definition at line 85 of file X86FixupVectorConstants.cpp.

References assert(), llvm::CallingConv::C, extractConstantBits(), llvm::User::getOperand(), llvm::APInt::getSplat(), getSplatValueAllowUndef(), llvm::APInt::getZero(), and I.

Referenced by extractConstantBits(), getSplatableConstant(), rebuildExtCst(), and rebuildZeroUpperCst().

extractConstantBits() [2/2]

static std::optional< APInt > extractConstantBits ( const Constant *  C, unsigned  NumBits  )

static

Definition at line 141 of file X86FixupVectorConstants.cpp.

References llvm::CallingConv::C, and extractConstantBits().

getSplatableConstant()

static std::optional< APInt > getSplatableConstant ( const Constant *  C, unsigned  SplatBitWidth  )

static

Definition at line 150 of file X86FixupVectorConstants.cpp.

References assert(), llvm::CallingConv::C, extractConstantBits(), llvm::Constant::getAggregateElement(), llvm::Type::getPrimitiveSizeInBits(), llvm::Type::getScalarSizeInBits(), llvm::APInt::getZero(), I, Idx, and llvm::APInt::insertBits().

Referenced by rebuildSplatCst().

getSplatValueAllowUndef()

static Constant * getSplatValueAllowUndef ( const ConstantVector *  C )

static

Normally, we only allow poison in vector splats.

However, as this is part of the backend, and working with the DAG representation, which currently only natively represents undef values, we need to accept undefs here.

Definition at line 70 of file X86FixupVectorConstants.cpp.

References llvm::CallingConv::C.

Referenced by extractConstantBits().

rebuildConstant()

static Constant * rebuildConstant ( LLVMContext &  Ctx, Type *  SclTy, const APInt &  Bits, unsigned  NumSclBits  )

static

Definition at line 203 of file X86FixupVectorConstants.cpp.

References assert(), llvm::BitWidth, llvm::ConstantDataVector::get(), llvm::ConstantDataVector::getFP(), I, llvm::Type::is16bitFPTy(), llvm::Type::isDoubleTy(), llvm::Type::isFloatTy(), and llvm::SmallVectorTemplateBase< T, bool >::push_back().

Referenced by rebuildExtCst(), rebuildSplatCst(), and rebuildZeroUpperCst().

rebuildExtCst()

static Constant * rebuildExtCst ( const Constant *  C, bool  IsSExt, unsigned  NumBits, unsigned  NumElts, unsigned  SrcEltBitWidth  )

static

Definition at line 292 of file X86FixupVectorConstants.cpp.

References assert(), llvm::CallingConv::C, extractConstantBits(), llvm::APInt::getActiveBits(), llvm::Type::getContext(), llvm::Type::getScalarType(), llvm::APInt::getSignificantBits(), llvm::APInt::getZero(), I, llvm::APInt::insertBits(), rebuildConstant(), and llvm::APInt::trunc().

Referenced by rebuildSExtCst(), and rebuildZExtCst().

rebuildSExtCst()

static Constant * rebuildSExtCst ( const Constant *  C, unsigned  NumBits, unsigned  NumElts, unsigned  SrcEltBitWidth  )

static

Definition at line 322 of file X86FixupVectorConstants.cpp.

References llvm::CallingConv::C, and rebuildExtCst().

rebuildSplatCst()

static Constant * rebuildSplatCst ( const Constant *  C, unsigned  , unsigned  , unsigned  SplatBitWidth  )

static

Definition at line 244 of file X86FixupVectorConstants.cpp.

References llvm::CallingConv::C, llvm::Type::getPrimitiveSizeInBits(), getSplatableConstant(), rebuildConstant(), and llvm::Splat.

rebuildZeroUpperCst()

static Constant * rebuildZeroUpperCst ( const Constant *  C, unsigned  NumBits, unsigned  , unsigned  ScalarBitWidth  )

static

Definition at line 266 of file X86FixupVectorConstants.cpp.

References llvm::CallingConv::C, extractConstantBits(), llvm::Type::getPrimitiveSizeInBits(), and rebuildConstant().

rebuildZExtCst()

static Constant * rebuildZExtCst ( const Constant *  C, unsigned  NumBits, unsigned  NumElts, unsigned  SrcEltBitWidth  )

static

Definition at line 326 of file X86FixupVectorConstants.cpp.

References llvm::CallingConv::C, and rebuildExtCst().

STATISTIC()

STATISTIC	(	NumInstChanges	,
		"Number of instructions changes"
	)