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]

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

static

Definition at line 84 of file X86FixupVectorConstants.cpp.

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

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

extractConstantBits() [2/2]

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

static

Definition at line 148 of file X86FixupVectorConstants.cpp.

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

getSplatableConstant()

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

static

Definition at line 157 of file X86FixupVectorConstants.cpp.

References AbstractManglingParser< Derived, Alloc >::NumOps, assert(), llvm::CallingConv::C, llvm::dyn_cast(), extractConstantBits(), llvm::Constant::getAggregateElement(), llvm::APInt::getZero(), I, llvm::APInt::insertBits(), and llvm::isa().

Referenced by rebuildSplatCst().

getSplatValueAllowUndef()

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 69 of file X86FixupVectorConstants.cpp.

References llvm::CallingConv::C, llvm::cast(), and llvm::isa().

Referenced by extractConstantBits().

rebuildConstant()

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

static

Definition at line 210 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()

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

static

Definition at line 299 of file X86FixupVectorConstants.cpp.

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

Referenced by rebuildSExtCst(), and rebuildZExtCst().

rebuildSExtCst()

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

static

Definition at line 329 of file X86FixupVectorConstants.cpp.

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

rebuildSplatCst()

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

static

Definition at line 251 of file X86FixupVectorConstants.cpp.

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

rebuildZeroUpperCst()

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

static

Definition at line 273 of file X86FixupVectorConstants.cpp.

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

rebuildZExtCst()

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

static

Definition at line 333 of file X86FixupVectorConstants.cpp.

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

STATISTIC()

STATISTIC	(	NumInstChanges	,
		"Number of instructions changes"	)