SIShrinkInstructions.cpp File Reference

#include "AMDGPU.h"
#include "AMDGPUSubtarget.h"
#include "SIInstrInfo.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/Debug.h"
#include "llvm/Target/TargetMachine.h"

Include dependency graph for SIShrinkInstructions.cpp:

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Namespaces
namespace	llvm
	List of target independent CodeGen pass IDs.
Defines
#define	DEBUG_TYPE   "si-shrink-instructions"
	The pass tries to use the 32-bit encoding for instructions when possible.
Functions
	STATISTIC (NumInstructionsShrunk,"Number of 64-bit instruction reduced to 32-bit.")
	STATISTIC (NumLiteralConstantsFolded,"Number of literal constants folded into 32-bit instructions.")
void	llvm::initializeSIShrinkInstructionsPass (PassRegistry &)
	INITIALIZE_PASS_BEGIN (SIShrinkInstructions, DEBUG_TYPE,"SI Lower il Copies", false, false) INITIALIZE_PASS_END(SIShrinkInstructions
static bool	isVGPR (const MachineOperand *MO, const SIRegisterInfo &TRI, const MachineRegisterInfo &MRI)
static bool	canShrink (MachineInstr &MI, const SIInstrInfo *TII, const SIRegisterInfo &TRI, const MachineRegisterInfo &MRI)
static void	foldImmediates (MachineInstr &MI, const SIInstrInfo *TII, MachineRegisterInfo &MRI, bool TryToCommute=true)
	This function checks MI for operands defined by a move immediate instruction and then folds the literal constant into the instruction if it can. This function assumes that MI is a VOP1, VOP2, or VOPC instruction and will only fold literal constants if we are still in SSA.
Variables
	DEBUG_TYPE
SI Lower il	Copies
SI Lower il	false

---

Define Documentation

#define DEBUG_TYPE   "si-shrink-instructions"

The pass tries to use the 32-bit encoding for instructions when possible.

Definition at line 25 of file SIShrinkInstructions.cpp.

---

Function Documentation

static bool canShrink	(	MachineInstr &	MI,
		const SIInstrInfo *	TII,
		const SIRegisterInfo &	TRI,
		const MachineRegisterInfo &	MRI
	)		[static]

Definition at line 84 of file SIShrinkInstructions.cpp.

References llvm::MachineOperand::getImm(), llvm::SIInstrInfo::getNamedOperand(), and isVGPR().

static void foldImmediates	(	MachineInstr &	MI,
		const SIInstrInfo *	TII,
		MachineRegisterInfo &	MRI,
		bool	TryToCommute = true
	)		[static]

This function checks MI for operands defined by a move immediate instruction and then folds the literal constant into the instruction if it can. This function assumes that MI is a VOP1, VOP2, or VOPC instruction and will only fold literal constants if we are still in SSA.

Definition at line 120 of file SIShrinkInstructions.cpp.

References llvm::APFloat::bitcastToAPInt(), llvm::MachineOperand::ChangeToImmediate(), llvm::SIInstrInfo::commuteInstruction(), llvm::tgtok::Def, llvm::MachineInstr::eraseFromParent(), llvm::MachineOperand::getFPImm(), llvm::MachineOperand::getImm(), llvm::SIInstrInfo::getNamedOperand(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), llvm::MachineOperand::getReg(), llvm::SIInstrInfo::getRegisterInfo(), llvm::APFloat::getSemantics(), llvm::MachineRegisterInfo::getUniqueVRegDef(), llvm::ConstantFP::getValueAPF(), llvm::APInt::getZExtValue(), llvm::APFloat::IEEEsingle, llvm::MachineInstr::isCommutable(), llvm::MachineOperand::isFPImm(), llvm::MachineOperand::isImm(), llvm::SIInstrInfo::isLiteralConstant(), llvm::MachineInstr::isMoveImmediate(), llvm::MachineOperand::isReg(), llvm::MachineRegisterInfo::isSSA(), llvm::isUInt< 32 >(), isVGPR(), llvm::SIInstrInfo::isVOP1(), llvm::SIInstrInfo::isVOP2(), llvm::SIInstrInfo::isVOPC(), llvm::MachineRegisterInfo::removeRegOperandFromUseList(), and llvm::MachineRegisterInfo::use_empty().

INITIALIZE_PASS_BEGIN	(	SIShrinkInstructions	,
		DEBUG_TYPE	,
		"SI Lower il Copies"	,
		false	,
		false
	)

static bool isVGPR	(	const MachineOperand *	MO,
		const SIRegisterInfo &	TRI,
		const MachineRegisterInfo &	MRI
	)		[static]

Definition at line 73 of file SIShrinkInstructions.cpp.

References llvm::SIRegisterInfo::getPhysRegClass(), llvm::MachineOperand::getReg(), llvm::MachineRegisterInfo::getRegClass(), llvm::SIRegisterInfo::hasVGPRs(), llvm::MachineOperand::isReg(), and llvm::TargetRegisterInfo::isVirtualRegister().

Referenced by canShrink(), and foldImmediates().

STATISTIC	(	NumInstructionsShrunk	,
		"Number of 64-bit instruction reduced to 32-bit."
	)

STATISTIC	(	NumLiteralConstantsFolded	,
		"Number of literal constants folded into 32-bit instructions."
	)

---

Variable Documentation

SI Lower il Copies

Definition at line 64 of file SIShrinkInstructions.cpp.

DEBUG_TYPE

Definition at line 64 of file SIShrinkInstructions.cpp.

SI Lower il false

Definition at line 64 of file SIShrinkInstructions.cpp.