LDSAlignShift = 9;
}
+ unsigned LDSSpillSize = MFI->LDSWaveSpillSize *
+ MFI->getMaximumWorkGroupSize(MF);
+
unsigned LDSBlocks =
- RoundUpToAlignment(MFI->LDSSize, 1 << LDSAlignShift) >> LDSAlignShift;
+ RoundUpToAlignment(MFI->LDSSize + LDSSpillSize,
+ 1 << LDSAlignShift) >> LDSAlignShift;
// Scratch is allocated in 256 dword blocks.
unsigned ScratchAlignShift = 10;
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Function.h"
+#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/MC/MCInstrDesc.h"
using namespace llvm;
return Opcode;
}
+static bool shouldTryToSpillVGPRs(MachineFunction *MF) {
+
+ SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
+ const TargetMachine &TM = MF->getTarget();
+
+ // FIXME: Even though it can cause problems, we need to enable
+ // spilling at -O0, since the fast register allocator always
+ // spills registers that are live at the end of blocks.
+ return MFI->getShaderType() == ShaderType::COMPUTE &&
+ TM.getOptLevel() == CodeGenOpt::None;
+
+}
+
void SIInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill,
MachineFunction *MF = MBB.getParent();
MachineFrameInfo *FrameInfo = MF->getFrameInfo();
DebugLoc DL = MBB.findDebugLoc(MI);
+ int Opcode = -1;
- if (RI.hasVGPRs(RC)) {
- LLVMContext &Ctx = MF->getFunction()->getContext();
- Ctx.emitError("SIInstrInfo::storeRegToStackSlot - Can't spill VGPR!");
- BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), AMDGPU::VGPR0)
- .addReg(SrcReg);
- } else if (RI.isSGPRClass(RC)) {
+ if (RI.isSGPRClass(RC)) {
// We are only allowed to create one new instruction when spilling
// registers, so we need to use pseudo instruction for spilling
// SGPRs.
- unsigned Opcode;
switch (RC->getSize() * 8) {
- case 32: Opcode = AMDGPU::SI_SPILL_S32_SAVE; break;
- case 64: Opcode = AMDGPU::SI_SPILL_S64_SAVE; break;
- case 128: Opcode = AMDGPU::SI_SPILL_S128_SAVE; break;
- case 256: Opcode = AMDGPU::SI_SPILL_S256_SAVE; break;
- case 512: Opcode = AMDGPU::SI_SPILL_S512_SAVE; break;
- default: llvm_unreachable("Cannot spill register class");
+ case 32: Opcode = AMDGPU::SI_SPILL_S32_SAVE; break;
+ case 64: Opcode = AMDGPU::SI_SPILL_S64_SAVE; break;
+ case 128: Opcode = AMDGPU::SI_SPILL_S128_SAVE; break;
+ case 256: Opcode = AMDGPU::SI_SPILL_S256_SAVE; break;
+ case 512: Opcode = AMDGPU::SI_SPILL_S512_SAVE; break;
}
+ } else if(shouldTryToSpillVGPRs(MF) && RI.hasVGPRs(RC)) {
+ switch(RC->getSize() * 8) {
+ case 32: Opcode = AMDGPU::SI_SPILL_V32_SAVE; break;
+ case 64: Opcode = AMDGPU::SI_SPILL_V64_SAVE; break;
+ case 96: Opcode = AMDGPU::SI_SPILL_V96_SAVE; break;
+ case 128: Opcode = AMDGPU::SI_SPILL_V128_SAVE; break;
+ case 256: Opcode = AMDGPU::SI_SPILL_V256_SAVE; break;
+ case 512: Opcode = AMDGPU::SI_SPILL_V512_SAVE; break;
+ }
+ }
+ if (Opcode != -1) {
FrameInfo->setObjectAlignment(FrameIndex, 4);
BuildMI(MBB, MI, DL, get(Opcode))
.addReg(SrcReg)
.addFrameIndex(FrameIndex);
} else {
- llvm_unreachable("VGPR spilling not supported");
+ LLVMContext &Ctx = MF->getFunction()->getContext();
+ Ctx.emitError("SIInstrInfo::storeRegToStackSlot - Do not know how to"
+ " spill register");
+ BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), AMDGPU::VGPR0)
+ .addReg(SrcReg);
}
}
MachineFunction *MF = MBB.getParent();
MachineFrameInfo *FrameInfo = MF->getFrameInfo();
DebugLoc DL = MBB.findDebugLoc(MI);
+ int Opcode = -1;
- if (RI.hasVGPRs(RC)) {
- LLVMContext &Ctx = MF->getFunction()->getContext();
- Ctx.emitError("SIInstrInfo::loadRegToStackSlot - Can't retrieve spilled VGPR!");
- BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DestReg)
- .addImm(0);
- } else if (RI.isSGPRClass(RC)){
- unsigned Opcode;
+ if (RI.isSGPRClass(RC)){
switch(RC->getSize() * 8) {
- case 32: Opcode = AMDGPU::SI_SPILL_S32_RESTORE; break;
- case 64: Opcode = AMDGPU::SI_SPILL_S64_RESTORE; break;
- case 128: Opcode = AMDGPU::SI_SPILL_S128_RESTORE; break;
- case 256: Opcode = AMDGPU::SI_SPILL_S256_RESTORE; break;
- case 512: Opcode = AMDGPU::SI_SPILL_S512_RESTORE; break;
- default: llvm_unreachable("Cannot spill register class");
+ case 32: Opcode = AMDGPU::SI_SPILL_S32_RESTORE; break;
+ case 64: Opcode = AMDGPU::SI_SPILL_S64_RESTORE; break;
+ case 128: Opcode = AMDGPU::SI_SPILL_S128_RESTORE; break;
+ case 256: Opcode = AMDGPU::SI_SPILL_S256_RESTORE; break;
+ case 512: Opcode = AMDGPU::SI_SPILL_S512_RESTORE; break;
}
+ } else if(shouldTryToSpillVGPRs(MF) && RI.hasVGPRs(RC)) {
+ switch(RC->getSize() * 8) {
+ case 32: Opcode = AMDGPU::SI_SPILL_V32_RESTORE; break;
+ case 64: Opcode = AMDGPU::SI_SPILL_V64_RESTORE; break;
+ case 96: Opcode = AMDGPU::SI_SPILL_V96_RESTORE; break;
+ case 128: Opcode = AMDGPU::SI_SPILL_V128_RESTORE; break;
+ case 256: Opcode = AMDGPU::SI_SPILL_V256_RESTORE; break;
+ case 512: Opcode = AMDGPU::SI_SPILL_V512_RESTORE; break;
+ }
+ }
+ if (Opcode != -1) {
FrameInfo->setObjectAlignment(FrameIndex, 4);
BuildMI(MBB, MI, DL, get(Opcode), DestReg)
.addFrameIndex(FrameIndex);
} else {
- llvm_unreachable("VGPR spilling not supported");
+ LLVMContext &Ctx = MF->getFunction()->getContext();
+ Ctx.emitError("SIInstrInfo::loadRegFromStackSlot - Do not know how to"
+ " restore register");
+ BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DestReg)
+ .addReg(AMDGPU::VGPR0);
+ }
+}
+
+/// \param @Offset Offset in bytes of the FrameIndex being spilled
+unsigned SIInstrInfo::calculateLDSSpillAddress(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ RegScavenger *RS, unsigned TmpReg,
+ unsigned FrameOffset,
+ unsigned Size) const {
+ MachineFunction *MF = MBB.getParent();
+ SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
+ const AMDGPUSubtarget &ST = MF->getTarget().getSubtarget<AMDGPUSubtarget>();
+ const SIRegisterInfo *TRI =
+ static_cast<const SIRegisterInfo*>(ST.getRegisterInfo());
+ DebugLoc DL = MBB.findDebugLoc(MI);
+ unsigned WorkGroupSize = MFI->getMaximumWorkGroupSize(*MF);
+ unsigned WavefrontSize = ST.getWavefrontSize();
+
+ unsigned TIDReg = MFI->getTIDReg();
+ if (!MFI->hasCalculatedTID()) {
+ MachineBasicBlock &Entry = MBB.getParent()->front();
+ MachineBasicBlock::iterator Insert = Entry.front();
+ DebugLoc DL = Insert->getDebugLoc();
+
+ TIDReg = RI.findUnusedVGPR(MF->getRegInfo());
+ if (TIDReg == AMDGPU::NoRegister)
+ return TIDReg;
+
+
+ if (MFI->getShaderType() == ShaderType::COMPUTE &&
+ WorkGroupSize > WavefrontSize) {
+
+ unsigned TIDIGXReg = TRI->getPreloadedValue(*MF, SIRegisterInfo::TIDIG_X);
+ unsigned TIDIGYReg = TRI->getPreloadedValue(*MF, SIRegisterInfo::TIDIG_Y);
+ unsigned TIDIGZReg = TRI->getPreloadedValue(*MF, SIRegisterInfo::TIDIG_Z);
+ unsigned InputPtrReg =
+ TRI->getPreloadedValue(*MF, SIRegisterInfo::INPUT_PTR);
+ static const unsigned TIDIGRegs[3] = {
+ TIDIGXReg, TIDIGYReg, TIDIGZReg
+ };
+ for (unsigned Reg : TIDIGRegs) {
+ if (!Entry.isLiveIn(Reg))
+ Entry.addLiveIn(Reg);
+ }
+
+ RS->enterBasicBlock(&Entry);
+ unsigned STmp0 = RS->scavengeRegister(&AMDGPU::SGPR_32RegClass, 0);
+ unsigned STmp1 = RS->scavengeRegister(&AMDGPU::SGPR_32RegClass, 0);
+ BuildMI(Entry, Insert, DL, get(AMDGPU::S_LOAD_DWORD_IMM), STmp0)
+ .addReg(InputPtrReg)
+ .addImm(SI::KernelInputOffsets::NGROUPS_Z);
+ BuildMI(Entry, Insert, DL, get(AMDGPU::S_LOAD_DWORD_IMM), STmp1)
+ .addReg(InputPtrReg)
+ .addImm(SI::KernelInputOffsets::NGROUPS_Y);
+
+ // NGROUPS.X * NGROUPS.Y
+ BuildMI(Entry, Insert, DL, get(AMDGPU::S_MUL_I32), STmp1)
+ .addReg(STmp1)
+ .addReg(STmp0);
+ // (NGROUPS.X * NGROUPS.Y) * TIDIG.X
+ BuildMI(Entry, Insert, DL, get(AMDGPU::V_MUL_U32_U24_e32), TIDReg)
+ .addReg(STmp1)
+ .addReg(TIDIGXReg);
+ // NGROUPS.Z * TIDIG.Y + (NGROUPS.X * NGROPUS.Y * TIDIG.X)
+ BuildMI(Entry, Insert, DL, get(AMDGPU::V_MAD_U32_U24), TIDReg)
+ .addReg(STmp0)
+ .addReg(TIDIGYReg)
+ .addReg(TIDReg);
+ // (NGROUPS.Z * TIDIG.Y + (NGROUPS.X * NGROPUS.Y * TIDIG.X)) + TIDIG.Z
+ BuildMI(Entry, Insert, DL, get(AMDGPU::V_ADD_I32_e32), TIDReg)
+ .addReg(TIDReg)
+ .addReg(TIDIGZReg);
+ } else {
+ // Get the wave id
+ BuildMI(Entry, Insert, DL, get(AMDGPU::V_MBCNT_LO_U32_B32_e64),
+ TIDReg)
+ .addImm(-1)
+ .addImm(0);
+
+ BuildMI(Entry, Insert, DL, get(AMDGPU::V_MBCNT_HI_U32_B32_e32),
+ TIDReg)
+ .addImm(-1)
+ .addReg(TIDReg);
+ }
+
+ BuildMI(Entry, Insert, DL, get(AMDGPU::V_LSHLREV_B32_e32),
+ TIDReg)
+ .addImm(2)
+ .addReg(TIDReg);
+ MFI->setTIDReg(TIDReg);
}
+
+ // Add FrameIndex to LDS offset
+ unsigned LDSOffset = MFI->LDSSize + (FrameOffset * WorkGroupSize);
+ BuildMI(MBB, MI, DL, get(AMDGPU::V_ADD_I32_e32), TmpReg)
+ .addImm(LDSOffset)
+ .addReg(TIDReg);
+
+ return TmpReg;
}
void SIInstrInfo::insertNOPs(MachineBasicBlock::iterator MI,
unsigned DestReg, unsigned SrcReg,
bool KillSrc) const override;
+ unsigned calculateLDSSpillAddress(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ RegScavenger *RS,
+ unsigned TmpReg,
+ unsigned Offset,
+ unsigned Size) const;
+
void storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill, int FrameIndex,
defm SI_SPILL_S256 : SI_SPILL_SGPR <SReg_256>;
defm SI_SPILL_S512 : SI_SPILL_SGPR <SReg_512>;
+multiclass SI_SPILL_VGPR <RegisterClass vgpr_class> {
+ def _SAVE : InstSI <
+ (outs),
+ (ins vgpr_class:$src, i32imm:$frame_idx),
+ "", []
+ >;
+
+ def _RESTORE : InstSI <
+ (outs vgpr_class:$dst),
+ (ins i32imm:$frame_idx),
+ "", []
+ >;
+}
+
+defm SI_SPILL_V32 : SI_SPILL_VGPR <VReg_32>;
+defm SI_SPILL_V64 : SI_SPILL_VGPR <VReg_64>;
+defm SI_SPILL_V96 : SI_SPILL_VGPR <VReg_96>;
+defm SI_SPILL_V128 : SI_SPILL_VGPR <VReg_128>;
+defm SI_SPILL_V256 : SI_SPILL_VGPR <VReg_256>;
+defm SI_SPILL_V512 : SI_SPILL_VGPR <VReg_512>;
+
let Defs = [SCC] in {
def SI_CONSTDATA_PTR : InstSI <
#include "SIMachineFunctionInfo.h"
+#include "AMDGPUSubtarget.h"
#include "SIInstrInfo.h"
-#include "SIRegisterInfo.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Function.h"
SIMachineFunctionInfo::SIMachineFunctionInfo(const MachineFunction &MF)
: AMDGPUMachineFunction(MF),
+ TIDReg(AMDGPU::NoRegister),
PSInputAddr(0),
- NumUserSGPRs(0) { }
-
-/// \brief Returns a register that is not used at any point in the function.
-/// If all registers are used, then this function will return
-// AMDGPU::NoRegister.
-static unsigned findUnusedVGPR(const MachineRegisterInfo &MRI) {
-
- const TargetRegisterClass *RC = &AMDGPU::VGPR_32RegClass;
-
- for (TargetRegisterClass::iterator I = RC->begin(), E = RC->end();
- I != E; ++I) {
- if (!MRI.isPhysRegUsed(*I))
- return *I;
- }
- return AMDGPU::NoRegister;
-}
+ NumUserSGPRs(0),
+ LDSWaveSpillSize(0) { }
SIMachineFunctionInfo::SpilledReg SIMachineFunctionInfo::getSpilledReg(
MachineFunction *MF,
unsigned FrameIndex,
unsigned SubIdx) {
const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
+ const SIRegisterInfo *TRI = static_cast<const SIRegisterInfo*>(
+ MF->getTarget().getSubtarget<AMDGPUSubtarget>().getRegisterInfo());
MachineRegisterInfo &MRI = MF->getRegInfo();
int64_t Offset = FrameInfo->getObjectOffset(FrameIndex);
Offset += SubIdx * 4;
struct SpilledReg Spill;
if (!LaneVGPRs.count(LaneVGPRIdx)) {
- unsigned LaneVGPR = findUnusedVGPR(MRI);
+ unsigned LaneVGPR = TRI->findUnusedVGPR(MRI);
LaneVGPRs[LaneVGPRIdx] = LaneVGPR;
MRI.setPhysRegUsed(LaneVGPR);
Spill.Lane = Lane;
return Spill;
}
+
+unsigned SIMachineFunctionInfo::getMaximumWorkGroupSize(
+ const MachineFunction &MF) const {
+ const AMDGPUSubtarget &ST = MF.getTarget().getSubtarget<AMDGPUSubtarget>();
+ // FIXME: We should get this information from kernel attributes if it
+ // is available.
+ return getShaderType() == ShaderType::COMPUTE ? 256 : ST.getWavefrontSize();
+}
#define LLVM_LIB_TARGET_R600_SIMACHINEFUNCTIONINFO_H
#include "AMDGPUMachineFunction.h"
+#include "SIRegisterInfo.h"
#include <map>
namespace llvm {
/// tells the hardware which interpolation parameters to load.
class SIMachineFunctionInfo : public AMDGPUMachineFunction {
void anchor() override;
+
+ unsigned TIDReg;
+
public:
struct SpilledReg {
unsigned PSInputAddr;
unsigned NumUserSGPRs;
std::map<unsigned, unsigned> LaneVGPRs;
+ unsigned LDSWaveSpillSize;
+ bool hasCalculatedTID() const { return TIDReg != AMDGPU::NoRegister; };
+ unsigned getTIDReg() const { return TIDReg; };
+ void setTIDReg(unsigned Reg) { TIDReg = Reg; }
+
+ unsigned getMaximumWorkGroupSize(const MachineFunction &MF) const;
};
} // End namespace llvm
Reserved.set(AMDGPU::EXEC);
Reserved.set(AMDGPU::INDIRECT_BASE_ADDR);
Reserved.set(AMDGPU::FLAT_SCR);
+
+ // Reserve some VGPRs to use as temp registers in case we have to spill VGPRs
+ Reserved.set(AMDGPU::VGPR255);
+ Reserved.set(AMDGPU::VGPR254);
+
return Reserved;
}
switch (Op) {
case AMDGPU::SI_SPILL_S512_SAVE:
case AMDGPU::SI_SPILL_S512_RESTORE:
+ case AMDGPU::SI_SPILL_V512_SAVE:
+ case AMDGPU::SI_SPILL_V512_RESTORE:
return 16;
case AMDGPU::SI_SPILL_S256_SAVE:
case AMDGPU::SI_SPILL_S256_RESTORE:
+ case AMDGPU::SI_SPILL_V256_SAVE:
+ case AMDGPU::SI_SPILL_V256_RESTORE:
return 8;
case AMDGPU::SI_SPILL_S128_SAVE:
case AMDGPU::SI_SPILL_S128_RESTORE:
+ case AMDGPU::SI_SPILL_V128_SAVE:
+ case AMDGPU::SI_SPILL_V128_RESTORE:
return 4;
+ case AMDGPU::SI_SPILL_V96_SAVE:
+ case AMDGPU::SI_SPILL_V96_RESTORE:
+ return 3;
case AMDGPU::SI_SPILL_S64_SAVE:
case AMDGPU::SI_SPILL_S64_RESTORE:
+ case AMDGPU::SI_SPILL_V64_SAVE:
+ case AMDGPU::SI_SPILL_V64_RESTORE:
return 2;
case AMDGPU::SI_SPILL_S32_SAVE:
case AMDGPU::SI_SPILL_S32_RESTORE:
+ case AMDGPU::SI_SPILL_V32_SAVE:
+ case AMDGPU::SI_SPILL_V32_RESTORE:
return 1;
default: llvm_unreachable("Invalid spill opcode");
}
break;
}
+ // VGPR register spill
+ case AMDGPU::SI_SPILL_V512_SAVE:
+ case AMDGPU::SI_SPILL_V256_SAVE:
+ case AMDGPU::SI_SPILL_V128_SAVE:
+ case AMDGPU::SI_SPILL_V96_SAVE:
+ case AMDGPU::SI_SPILL_V64_SAVE:
+ case AMDGPU::SI_SPILL_V32_SAVE: {
+ unsigned NumSubRegs = getNumSubRegsForSpillOp(MI->getOpcode());
+ unsigned SrcReg = MI->getOperand(0).getReg();
+ int64_t Offset = FrameInfo->getObjectOffset(Index);
+ unsigned Size = NumSubRegs * 4;
+ unsigned TmpReg = RS->scavengeRegister(&AMDGPU::VGPR_32RegClass, MI, 0);
+
+ for (unsigned i = 0, e = NumSubRegs; i != e; ++i) {
+ unsigned SubReg = NumSubRegs > 1 ?
+ getPhysRegSubReg(SrcReg, &AMDGPU::VGPR_32RegClass, i) :
+ SrcReg;
+ Offset += (i * 4);
+ MFI->LDSWaveSpillSize = std::max((unsigned)Offset + 4, (unsigned)MFI->LDSWaveSpillSize);
+
+ unsigned AddrReg = TII->calculateLDSSpillAddress(*MBB, MI, RS, TmpReg,
+ Offset, Size);
+
+ if (AddrReg == AMDGPU::NoRegister) {
+ LLVMContext &Ctx = MF->getFunction()->getContext();
+ Ctx.emitError("Ran out of VGPRs for spilling VGPRS");
+ AddrReg = AMDGPU::VGPR0;
+ }
+
+ // Store the value in LDS
+ BuildMI(*MBB, MI, DL, TII->get(AMDGPU::DS_WRITE_B32))
+ .addImm(0) // gds
+ .addReg(AddrReg, RegState::Kill) // addr
+ .addReg(SubReg) // data0
+ .addImm(0); // offset
+ }
+
+ MI->eraseFromParent();
+ break;
+ }
+ case AMDGPU::SI_SPILL_V32_RESTORE:
+ case AMDGPU::SI_SPILL_V64_RESTORE:
+ case AMDGPU::SI_SPILL_V128_RESTORE:
+ case AMDGPU::SI_SPILL_V256_RESTORE:
+ case AMDGPU::SI_SPILL_V512_RESTORE: {
+ unsigned NumSubRegs = getNumSubRegsForSpillOp(MI->getOpcode());
+ unsigned DstReg = MI->getOperand(0).getReg();
+ int64_t Offset = FrameInfo->getObjectOffset(Index);
+ unsigned Size = NumSubRegs * 4;
+ unsigned TmpReg = RS->scavengeRegister(&AMDGPU::VGPR_32RegClass, MI, 0);
+
+ // FIXME: We could use DS_READ_B64 here to optimize for larger registers.
+ for (unsigned i = 0, e = NumSubRegs; i != e; ++i) {
+ unsigned SubReg = NumSubRegs > 1 ?
+ getPhysRegSubReg(DstReg, &AMDGPU::VGPR_32RegClass, i) :
+ DstReg;
+
+ Offset += (i * 4);
+ unsigned AddrReg = TII->calculateLDSSpillAddress(*MBB, MI, RS, TmpReg,
+ Offset, Size);
+ if (AddrReg == AMDGPU::NoRegister) {
+ LLVMContext &Ctx = MF->getFunction()->getContext();
+ Ctx.emitError("Ran out of VGPRs for spilling VGPRs");
+ AddrReg = AMDGPU::VGPR0;
+ }
+
+ BuildMI(*MBB, MI, DL, TII->get(AMDGPU::DS_READ_B32), SubReg)
+ .addImm(0) // gds
+ .addReg(AddrReg, RegState::Kill) // addr
+ .addImm(0); //offset
+ }
+ MI->eraseFromParent();
+ break;
+ }
+
default: {
int64_t Offset = FrameInfo->getObjectOffset(Index);
FIOp.ChangeToImmediate(Offset);
&AMDGPU::SReg_32RegClass,
&AMDGPU::VReg_64RegClass,
&AMDGPU::SReg_64RegClass,
+ &AMDGPU::VReg_96RegClass,
+ &AMDGPU::VReg_128RegClass,
&AMDGPU::SReg_128RegClass,
- &AMDGPU::SReg_256RegClass
+ &AMDGPU::VReg_256RegClass,
+ &AMDGPU::SReg_256RegClass,
+ &AMDGPU::VReg_512RegClass
};
for (const TargetRegisterClass *BaseClass : BaseClasses) {
}
llvm_unreachable("unexpected preloaded value type");
}
+
+/// \brief Returns a register that is not used at any point in the function.
+/// If all registers are used, then this function will return
+// AMDGPU::NoRegister.
+unsigned SIRegisterInfo::findUnusedVGPR(const MachineRegisterInfo &MRI) const {
+
+ const TargetRegisterClass *RC = &AMDGPU::VGPR_32RegClass;
+
+ for (TargetRegisterClass::iterator I = RC->begin(), E = RC->end();
+ I != E; ++I) {
+ if (!MRI.isPhysRegUsed(*I))
+ return *I;
+ }
+ return AMDGPU::NoRegister;
+}
+
unsigned getPreloadedValue(const MachineFunction &MF,
enum PreloadedValue Value) const;
+ unsigned findUnusedVGPR(const MachineRegisterInfo &MRI) const;
};
} // End namespace llvm
projects / oota-llvm.git / commitdiff