SIFrameLowering.cpp File Reference

#include "SIFrameLowering.h"
#include "AMDGPU.h"
#include "GCNSubtarget.h"
#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
#include "SIMachineFunctionInfo.h"
#include "llvm/CodeGen/LiveRegUnits.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/Target/TargetMachine.h"

Go to the source code of this file.

Classes
class	llvm::PrologEpilogSGPRSpillBuilder

Namespaces
namespace	llvm
	This is an optimization pass for GlobalISel generic memory operations.

Macros
#define	DEBUG_TYPE   "frame-info"

Functions
static MCRegister	findUnusedRegister (MachineRegisterInfo &MRI, const LiveRegUnits &LiveUnits, const TargetRegisterClass &RC)
static MCRegister	findScratchNonCalleeSaveRegister (MachineRegisterInfo &MRI, LiveRegUnits &LiveUnits, const TargetRegisterClass &RC, bool Unused=false)
static void	getVGPRSpillLaneOrTempRegister (MachineFunction &MF, LiveRegUnits &LiveUnits, Register SGPR, const TargetRegisterClass &RC=AMDGPU::SReg_32_XM0_XEXECRegClass, bool IncludeScratchCopy=true)
	Query target location for spilling SGPRs IncludeScratchCopy : Also look for free scratch SGPRs.
static void	buildPrologSpill (const GCNSubtarget &ST, const SIRegisterInfo &TRI, const SIMachineFunctionInfo &FuncInfo, LiveRegUnits &LiveUnits, MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator I, const DebugLoc &DL, Register SpillReg, int FI, Register FrameReg, int64_t DwordOff=0)
static void	buildEpilogRestore (const GCNSubtarget &ST, const SIRegisterInfo &TRI, const SIMachineFunctionInfo &FuncInfo, LiveRegUnits &LiveUnits, MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator I, const DebugLoc &DL, Register SpillReg, int FI, Register FrameReg, int64_t DwordOff=0)
static void	buildGitPtr (MachineBasicBlock &MBB, MachineBasicBlock::iterator I, const DebugLoc &DL, const SIInstrInfo *TII, Register TargetReg)
static void	initLiveUnits (LiveRegUnits &LiveUnits, const SIRegisterInfo &TRI, const SIMachineFunctionInfo *FuncInfo, MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, bool IsProlog)
static bool	allStackObjectsAreDead (const MachineFrameInfo &MFI)
static unsigned	getScratchScaleFactor (const GCNSubtarget &ST)
static Register	buildScratchExecCopy (LiveRegUnits &LiveUnits, MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, const DebugLoc &DL, bool IsProlog, bool EnableInactiveLanes)
static bool	allSGPRSpillsAreDead (const MachineFunction &MF)
static bool	frameTriviallyRequiresSP (const MachineFrameInfo &MFI)
	Returns true if the frame will require a reference to the stack pointer.

Variables
static cl::opt< bool >	EnableSpillVGPRToAGPR ("amdgpu-spill-vgpr-to-agpr", cl::desc("Enable spilling VGPRs to AGPRs"), cl::ReallyHidden, cl::init(true))

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "frame-info"

Definition at line 21 of file SIFrameLowering.cpp.

Function Documentation

allSGPRSpillsAreDead()

static bool allSGPRSpillsAreDead ( const MachineFunction &  MF )

static

Definition at line 1309 of file SIFrameLowering.cpp.

References llvm::SIMachineFunctionInfo::checkIndexInPrologEpilogSGPRSpills(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectIndexBegin(), llvm::MachineFrameInfo::getObjectIndexEnd(), llvm::MachineFrameInfo::getStackID(), I, llvm::MachineFrameInfo::isDeadObjectIndex(), and llvm::TargetStackID::SGPRSpill.

Referenced by llvm::SIFrameLowering::processFunctionBeforeFrameFinalized().

allStackObjectsAreDead()

static bool allStackObjectsAreDead ( const MachineFrameInfo &  MFI )

static

Definition at line 526 of file SIFrameLowering.cpp.

References llvm::MachineFrameInfo::getObjectIndexBegin(), llvm::MachineFrameInfo::getObjectIndexEnd(), I, and llvm::MachineFrameInfo::isDeadObjectIndex().

Referenced by llvm::SIFrameLowering::determinePrologEpilogSGPRSaves(), llvm::SIFrameLowering::emitEntryFunctionPrologue(), and llvm::SIFrameLowering::processFunctionBeforeFrameFinalized().

buildEpilogRestore()

static void buildEpilogRestore ( const GCNSubtarget &  ST, const SIRegisterInfo &  TRI, const SIMachineFunctionInfo &  FuncInfo, LiveRegUnits &  LiveUnits, MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  I, const DebugLoc &  DL, Register  SpillReg, int  FI, Register  FrameReg, int64_t  DwordOff = 0  )

static

Definition at line 157 of file SIFrameLowering.cpp.

References DL, llvm::MachinePointerInfo::getFixedStack(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getMachineMemOperand(), llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectSize(), I, MBB, llvm::MachineMemOperand::MOLoad, and TRI.

Referenced by llvm::SIFrameLowering::emitCSRSpillRestores().

buildGitPtr()

static void buildGitPtr ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  I, const DebugLoc &  DL, const SIInstrInfo *  TII, Register  TargetReg  )

static

Definition at line 177 of file SIFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineRegisterInfo::addLiveIn(), llvm::MachineInstrBuilder::addReg(), llvm::BuildMI(), DL, llvm::SIMachineFunctionInfo::getGITPtrHigh(), llvm::SIMachineFunctionInfo::getGITPtrLoReg(), llvm::MachineFunction::getInfo(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getRegInfo(), I, llvm::RegState::ImplicitDefine, MBB, TII, and TRI.

buildPrologSpill()

static void buildPrologSpill ( const GCNSubtarget &  ST, const SIRegisterInfo &  TRI, const SIMachineFunctionInfo &  FuncInfo, LiveRegUnits &  LiveUnits, MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  I, const DebugLoc &  DL, Register  SpillReg, int  FI, Register  FrameReg, int64_t  DwordOff = 0  )

static

Definition at line 134 of file SIFrameLowering.cpp.

References llvm::LiveRegUnits::addReg(), DL, llvm::MachinePointerInfo::getFixedStack(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getMachineMemOperand(), llvm::MachineFrameInfo::getObjectAlign(), llvm::MachineFrameInfo::getObjectSize(), I, llvm::MachineBasicBlock::isLiveIn(), MBB, llvm::MachineMemOperand::MOStore, llvm::LiveRegUnits::removeReg(), and TRI.

Referenced by llvm::SIFrameLowering::emitCSRSpillStores().

buildScratchExecCopy()

static Register buildScratchExecCopy ( LiveRegUnits &  LiveUnits, MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI, const DebugLoc &  DL, bool  IsProlog, bool  EnableInactiveLanes  )

static

Definition at line 887 of file SIFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::LiveRegUnits::addReg(), llvm::BuildMI(), DL, findScratchNonCalleeSaveRegister(), llvm::MachineFunction::getInfo(), llvm::MachineInstr::getOperand(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), initLiveUnits(), MBB, MBBI, MRI, llvm::report_fatal_error(), llvm::MachineOperand::setIsDead(), TII, and TRI.

Referenced by llvm::SIFrameLowering::emitCSRSpillRestores(), and llvm::SIFrameLowering::emitCSRSpillStores().

findScratchNonCalleeSaveRegister()

static MCRegister findScratchNonCalleeSaveRegister ( MachineRegisterInfo &  MRI, LiveRegUnits &  LiveUnits, const TargetRegisterClass &  RC, bool  Unused = false  )

static

Definition at line 49 of file SIFrameLowering.cpp.

References llvm::LiveRegUnits::addReg(), llvm::LiveRegUnits::available(), findUnusedRegister(), and MRI.

findUnusedRegister()

static MCRegister findUnusedRegister ( MachineRegisterInfo &  MRI, const LiveRegUnits &  LiveUnits, const TargetRegisterClass &  RC  )

static

Definition at line 34 of file SIFrameLowering.cpp.

References llvm::LiveRegUnits::available(), and MRI.

Referenced by llvm::SIFrameLowering::determinePrologEpilogSGPRSaves(), findScratchNonCalleeSaveRegister(), and getVGPRSpillLaneOrTempRegister().

frameTriviallyRequiresSP()

static bool frameTriviallyRequiresSP ( const MachineFrameInfo &  MFI )

static

Returns true if the frame will require a reference to the stack pointer.

This is the set of conditions common to setting up the stack pointer in a kernel, and for using a frame pointer in a callable function.

FIXME: Should also check hasOpaqueSPAdjustment and if any inline asm references SP.

Definition at line 1802 of file SIFrameLowering.cpp.

References llvm::MachineFrameInfo::hasPatchPoint(), llvm::MachineFrameInfo::hasStackMap(), and llvm::MachineFrameInfo::hasVarSizedObjects().

Referenced by llvm::SIFrameLowering::hasFPImpl(), and llvm::SIFrameLowering::requiresStackPointerReference().

getScratchScaleFactor()

static unsigned getScratchScaleFactor ( const GCNSubtarget &  ST )

static

Definition at line 590 of file SIFrameLowering.cpp.

Referenced by llvm::SIFrameLowering::eliminateCallFramePseudoInstr(), llvm::SIFrameLowering::emitEntryFunctionPrologue(), llvm::SIFrameLowering::emitEpilogue(), and llvm::SIFrameLowering::emitPrologue().

getVGPRSpillLaneOrTempRegister()

static void getVGPRSpillLaneOrTempRegister ( MachineFunction &  MF, LiveRegUnits &  LiveUnits, Register  SGPR, const TargetRegisterClass &  RC = AMDGPU::SReg_32_XM0_XEXECRegClass, bool  IncludeScratchCopy = true  )

static

Query target location for spilling SGPRs IncludeScratchCopy : Also look for free scratch SGPRs.

Definition at line 72 of file SIFrameLowering.cpp.

References llvm::LiveRegUnits::addReg(), llvm::SIMachineFunctionInfo::addToPrologEpilogSGPRSpills(), llvm::SIMachineFunctionInfo::allocateSGPRSpillToVGPRLane(), llvm::dbgs(), findUnusedRegister(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getRegInfo(), llvm::SIMachineFunctionInfo::getSGPRSpillToPhysicalVGPRLanes(), llvm::MachineFunction::getSubtarget(), LLVM_DEBUG, llvm::printReg(), llvm::MachineFrameInfo::RemoveStackObject(), llvm::TargetStackID::SGPRSpill, Size, and TRI.

Referenced by llvm::SIFrameLowering::determinePrologEpilogSGPRSaves().

initLiveUnits()

static void initLiveUnits ( LiveRegUnits &  LiveUnits, const SIRegisterInfo &  TRI, const SIMachineFunctionInfo *  FuncInfo, MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI, bool  IsProlog  )

static

Definition at line 202 of file SIFrameLowering.cpp.

References llvm::LiveRegUnits::addLiveIns(), llvm::LiveRegUnits::addLiveOuts(), llvm::LiveRegUnits::empty(), llvm::LiveRegUnits::init(), MBB, MBBI, llvm::LiveRegUnits::stepBackward(), and TRI.

Referenced by buildScratchExecCopy(), llvm::SIFrameLowering::emitEpilogue(), and llvm::SIFrameLowering::emitPrologue().

Variable Documentation

EnableSpillVGPRToAGPR

cl::opt< bool > EnableSpillVGPRToAGPR("amdgpu-spill-vgpr-to-agpr", cl::desc("Enable spilling VGPRs to AGPRs"), cl::ReallyHidden, cl::init(true)) ( "amdgpu-spill-vgpr-to-agpr"  , cl::desc("Enable spilling VGPRs to AGPRs")  , cl::ReallyHidden  , cl::init(true)    )

static

Referenced by llvm::SIFrameLowering::emitPrologue(), and llvm::SIFrameLowering::processFunctionBeforeFrameFinalized().