LLVM 17.0.0git
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SIFrameLowering.cpp File Reference
#include "SIFrameLowering.h"
#include "AMDGPU.h"
#include "GCNSubtarget.h"
#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
#include "SIMachineFunctionInfo.h"
#include "llvm/CodeGen/LivePhysRegs.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/Target/TargetMachine.h"
Include dependency graph for SIFrameLowering.cpp:

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 LivePhysRegs &LiveRegs, const TargetRegisterClass &RC)
 
static MCRegister findScratchNonCalleeSaveRegister (MachineRegisterInfo &MRI, LivePhysRegs &LiveRegs, const TargetRegisterClass &RC, bool Unused=false)
 
static void getVGPRSpillLaneOrTempRegister (MachineFunction &MF, LivePhysRegs &LiveRegs, Register SGPR, const TargetRegisterClass &RC=AMDGPU::SReg_32_XM0_XEXECRegClass)
 
static void buildPrologSpill (const GCNSubtarget &ST, const SIRegisterInfo &TRI, const SIMachineFunctionInfo &FuncInfo, LivePhysRegs &LiveRegs, 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, LivePhysRegs &LiveRegs, 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 initLiveRegs (LivePhysRegs &LiveRegs, 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 (LivePhysRegs &LiveRegs, 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 1282 of file SIFrameLowering.cpp.

References E, 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 515 of file SIFrameLowering.cpp.

References E, 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,
LivePhysRegs &  LiveRegs,
MachineFunction &  MF,
MachineBasicBlock &  MBB,
MachineBasicBlock::iterator  I,
const DebugLoc &  DL,
Register  SpillReg,
int  FI,
Register  FrameReg,
int64_t  DwordOff = 0 
)
static

Definition at line 147 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 167 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,
LivePhysRegs &  LiveRegs,
MachineFunction &  MF,
MachineBasicBlock &  MBB,
MachineBasicBlock::iterator  I,
const DebugLoc &  DL,
Register  SpillReg,
int  FI,
Register  FrameReg,
int64_t  DwordOff = 0 
)
static

Definition at line 124 of file SIFrameLowering.cpp.

References llvm::LivePhysRegs::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::LivePhysRegs::removeReg(), and TRI.

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

◆ buildScratchExecCopy()

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

Definition at line 870 of file SIFrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::LivePhysRegs::addReg(), llvm::BuildMI(), DL, findScratchNonCalleeSaveRegister(), llvm::MachineFunction::getInfo(), llvm::MachineInstr::getOperand(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), initLiveRegs(), 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,
LivePhysRegs &  LiveRegs,
const TargetRegisterClass &  RC,
bool  Unused = false 
)
static

Definition at line 45 of file SIFrameLowering.cpp.

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

◆ findUnusedRegister()

static MCRegister findUnusedRegister ( MachineRegisterInfo &  MRI,
const LivePhysRegs &  LiveRegs,
const TargetRegisterClass &  RC 
)
static

Definition at line 31 of file SIFrameLowering.cpp.

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

Referenced by 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 1702 of file SIFrameLowering.cpp.

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

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

◆ getScratchScaleFactor()

static unsigned getScratchScaleFactor ( const GCNSubtarget &  ST)
static

Definition at line 578 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,
LivePhysRegs &  LiveRegs,
Register  SGPR,
const TargetRegisterClass &  RC = AMDGPU::SReg_32_XM0_XEXECRegClass 
)
static

Definition at line 67 of file SIFrameLowering.cpp.

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

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

◆ initLiveRegs()

static void initLiveRegs ( LivePhysRegs &  LiveRegs,
const SIRegisterInfo &  TRI,
const SIMachineFunctionInfo *  FuncInfo,
MachineFunction &  MF,
MachineBasicBlock &  MBB,
MachineBasicBlock::iterator  MBBI,
bool  IsProlog 
)
static

Definition at line 192 of file SIFrameLowering.cpp.

References llvm::LivePhysRegs::addLiveIns(), llvm::LivePhysRegs::addLiveOuts(), llvm::LivePhysRegs::empty(), llvm::LivePhysRegs::init(), MBB, MBBI, llvm::LivePhysRegs::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().

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