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https://github.com/c64scene-ar/llvm-6502.git
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mubuf instructions now define the soffset field using the SCSrc_32 register class which indicates that only SGPRs and inline constants are allowed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224622 91177308-0d34-0410-b5e6-96231b3b80d8
470 lines
16 KiB
C++
470 lines
16 KiB
C++
//===-- SIRegisterInfo.cpp - SI Register Information ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// \brief SI implementation of the TargetRegisterInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "SIRegisterInfo.h"
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#include "AMDGPUSubtarget.h"
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#include "SIInstrInfo.h"
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#include "SIMachineFunctionInfo.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/RegisterScavenging.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/LLVMContext.h"
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using namespace llvm;
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SIRegisterInfo::SIRegisterInfo(const AMDGPUSubtarget &st)
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: AMDGPURegisterInfo(st)
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{ }
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BitVector SIRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
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BitVector Reserved(getNumRegs());
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Reserved.set(AMDGPU::EXEC);
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// EXEC_LO and EXEC_HI could be allocated and used as regular register,
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// but this seems likely to result in bugs, so I'm marking them as reserved.
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Reserved.set(AMDGPU::EXEC_LO);
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Reserved.set(AMDGPU::EXEC_HI);
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Reserved.set(AMDGPU::INDIRECT_BASE_ADDR);
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Reserved.set(AMDGPU::FLAT_SCR);
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Reserved.set(AMDGPU::FLAT_SCR_LO);
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Reserved.set(AMDGPU::FLAT_SCR_HI);
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// Reserve some VGPRs to use as temp registers in case we have to spill VGPRs
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Reserved.set(AMDGPU::VGPR255);
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Reserved.set(AMDGPU::VGPR254);
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return Reserved;
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}
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unsigned SIRegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC,
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MachineFunction &MF) const {
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return RC->getNumRegs();
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}
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bool SIRegisterInfo::requiresRegisterScavenging(const MachineFunction &Fn) const {
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return Fn.getFrameInfo()->hasStackObjects();
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}
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static unsigned getNumSubRegsForSpillOp(unsigned Op) {
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switch (Op) {
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case AMDGPU::SI_SPILL_S512_SAVE:
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case AMDGPU::SI_SPILL_S512_RESTORE:
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case AMDGPU::SI_SPILL_V512_SAVE:
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case AMDGPU::SI_SPILL_V512_RESTORE:
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return 16;
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case AMDGPU::SI_SPILL_S256_SAVE:
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case AMDGPU::SI_SPILL_S256_RESTORE:
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case AMDGPU::SI_SPILL_V256_SAVE:
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case AMDGPU::SI_SPILL_V256_RESTORE:
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return 8;
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case AMDGPU::SI_SPILL_S128_SAVE:
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case AMDGPU::SI_SPILL_S128_RESTORE:
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case AMDGPU::SI_SPILL_V128_SAVE:
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case AMDGPU::SI_SPILL_V128_RESTORE:
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return 4;
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case AMDGPU::SI_SPILL_V96_SAVE:
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case AMDGPU::SI_SPILL_V96_RESTORE:
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return 3;
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case AMDGPU::SI_SPILL_S64_SAVE:
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case AMDGPU::SI_SPILL_S64_RESTORE:
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case AMDGPU::SI_SPILL_V64_SAVE:
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case AMDGPU::SI_SPILL_V64_RESTORE:
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return 2;
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case AMDGPU::SI_SPILL_S32_SAVE:
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case AMDGPU::SI_SPILL_S32_RESTORE:
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case AMDGPU::SI_SPILL_V32_SAVE:
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case AMDGPU::SI_SPILL_V32_RESTORE:
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return 1;
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default: llvm_unreachable("Invalid spill opcode");
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}
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}
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void SIRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator MI,
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int SPAdj, unsigned FIOperandNum,
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RegScavenger *RS) const {
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MachineFunction *MF = MI->getParent()->getParent();
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MachineBasicBlock *MBB = MI->getParent();
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SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
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MachineFrameInfo *FrameInfo = MF->getFrameInfo();
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const SIInstrInfo *TII = static_cast<const SIInstrInfo*>(ST.getInstrInfo());
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DebugLoc DL = MI->getDebugLoc();
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MachineOperand &FIOp = MI->getOperand(FIOperandNum);
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int Index = MI->getOperand(FIOperandNum).getIndex();
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switch (MI->getOpcode()) {
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// SGPR register spill
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case AMDGPU::SI_SPILL_S512_SAVE:
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case AMDGPU::SI_SPILL_S256_SAVE:
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case AMDGPU::SI_SPILL_S128_SAVE:
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case AMDGPU::SI_SPILL_S64_SAVE:
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case AMDGPU::SI_SPILL_S32_SAVE: {
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unsigned NumSubRegs = getNumSubRegsForSpillOp(MI->getOpcode());
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for (unsigned i = 0, e = NumSubRegs; i < e; ++i) {
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unsigned SubReg = getPhysRegSubReg(MI->getOperand(0).getReg(),
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&AMDGPU::SGPR_32RegClass, i);
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struct SIMachineFunctionInfo::SpilledReg Spill =
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MFI->getSpilledReg(MF, Index, i);
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if (Spill.VGPR == AMDGPU::NoRegister) {
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LLVMContext &Ctx = MF->getFunction()->getContext();
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Ctx.emitError("Ran out of VGPRs for spilling SGPR");
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}
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BuildMI(*MBB, MI, DL, TII->get(AMDGPU::V_WRITELANE_B32), Spill.VGPR)
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.addReg(SubReg)
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.addImm(Spill.Lane);
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}
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MI->eraseFromParent();
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break;
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}
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// SGPR register restore
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case AMDGPU::SI_SPILL_S512_RESTORE:
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case AMDGPU::SI_SPILL_S256_RESTORE:
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case AMDGPU::SI_SPILL_S128_RESTORE:
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case AMDGPU::SI_SPILL_S64_RESTORE:
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case AMDGPU::SI_SPILL_S32_RESTORE: {
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unsigned NumSubRegs = getNumSubRegsForSpillOp(MI->getOpcode());
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for (unsigned i = 0, e = NumSubRegs; i < e; ++i) {
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unsigned SubReg = getPhysRegSubReg(MI->getOperand(0).getReg(),
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&AMDGPU::SGPR_32RegClass, i);
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bool isM0 = SubReg == AMDGPU::M0;
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struct SIMachineFunctionInfo::SpilledReg Spill =
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MFI->getSpilledReg(MF, Index, i);
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if (Spill.VGPR == AMDGPU::NoRegister) {
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LLVMContext &Ctx = MF->getFunction()->getContext();
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Ctx.emitError("Ran out of VGPRs for spilling SGPR");
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}
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if (isM0) {
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SubReg = RS->scavengeRegister(&AMDGPU::SGPR_32RegClass, MI, 0);
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}
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BuildMI(*MBB, MI, DL, TII->get(AMDGPU::V_READLANE_B32), SubReg)
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.addReg(Spill.VGPR)
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.addImm(Spill.Lane);
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if (isM0) {
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BuildMI(*MBB, MI, DL, TII->get(AMDGPU::S_MOV_B32), AMDGPU::M0)
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.addReg(SubReg);
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}
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}
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TII->insertNOPs(MI, 3);
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MI->eraseFromParent();
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break;
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}
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// VGPR register spill
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case AMDGPU::SI_SPILL_V512_SAVE:
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case AMDGPU::SI_SPILL_V256_SAVE:
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case AMDGPU::SI_SPILL_V128_SAVE:
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case AMDGPU::SI_SPILL_V96_SAVE:
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case AMDGPU::SI_SPILL_V64_SAVE:
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case AMDGPU::SI_SPILL_V32_SAVE: {
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unsigned NumSubRegs = getNumSubRegsForSpillOp(MI->getOpcode());
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unsigned SrcReg = MI->getOperand(0).getReg();
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int64_t Offset = FrameInfo->getObjectOffset(Index);
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unsigned Size = NumSubRegs * 4;
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unsigned TmpReg = RS->scavengeRegister(&AMDGPU::VGPR_32RegClass, MI, 0);
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for (unsigned i = 0, e = NumSubRegs; i != e; ++i) {
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unsigned SubReg = NumSubRegs > 1 ?
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getPhysRegSubReg(SrcReg, &AMDGPU::VGPR_32RegClass, i) :
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SrcReg;
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Offset += (i * 4);
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MFI->LDSWaveSpillSize = std::max((unsigned)Offset + 4, (unsigned)MFI->LDSWaveSpillSize);
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unsigned AddrReg = TII->calculateLDSSpillAddress(*MBB, MI, RS, TmpReg,
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Offset, Size);
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if (AddrReg == AMDGPU::NoRegister) {
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LLVMContext &Ctx = MF->getFunction()->getContext();
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Ctx.emitError("Ran out of VGPRs for spilling VGPRS");
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AddrReg = AMDGPU::VGPR0;
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}
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// Store the value in LDS
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BuildMI(*MBB, MI, DL, TII->get(AMDGPU::DS_WRITE_B32))
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.addImm(0) // gds
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.addReg(AddrReg, RegState::Kill) // addr
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.addReg(SubReg) // data0
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.addImm(0); // offset
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}
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MI->eraseFromParent();
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break;
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}
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case AMDGPU::SI_SPILL_V32_RESTORE:
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case AMDGPU::SI_SPILL_V64_RESTORE:
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case AMDGPU::SI_SPILL_V128_RESTORE:
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case AMDGPU::SI_SPILL_V256_RESTORE:
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case AMDGPU::SI_SPILL_V512_RESTORE: {
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unsigned NumSubRegs = getNumSubRegsForSpillOp(MI->getOpcode());
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unsigned DstReg = MI->getOperand(0).getReg();
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int64_t Offset = FrameInfo->getObjectOffset(Index);
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unsigned Size = NumSubRegs * 4;
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unsigned TmpReg = RS->scavengeRegister(&AMDGPU::VGPR_32RegClass, MI, 0);
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// FIXME: We could use DS_READ_B64 here to optimize for larger registers.
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for (unsigned i = 0, e = NumSubRegs; i != e; ++i) {
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unsigned SubReg = NumSubRegs > 1 ?
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getPhysRegSubReg(DstReg, &AMDGPU::VGPR_32RegClass, i) :
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DstReg;
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Offset += (i * 4);
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unsigned AddrReg = TII->calculateLDSSpillAddress(*MBB, MI, RS, TmpReg,
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Offset, Size);
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if (AddrReg == AMDGPU::NoRegister) {
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LLVMContext &Ctx = MF->getFunction()->getContext();
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Ctx.emitError("Ran out of VGPRs for spilling VGPRs");
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AddrReg = AMDGPU::VGPR0;
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}
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BuildMI(*MBB, MI, DL, TII->get(AMDGPU::DS_READ_B32), SubReg)
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.addImm(0) // gds
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.addReg(AddrReg, RegState::Kill) // addr
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.addImm(0); //offset
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}
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MI->eraseFromParent();
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break;
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}
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default: {
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int64_t Offset = FrameInfo->getObjectOffset(Index);
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FIOp.ChangeToImmediate(Offset);
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if (!TII->isImmOperandLegal(MI, FIOperandNum, FIOp)) {
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unsigned TmpReg = RS->scavengeRegister(&AMDGPU::VReg_32RegClass, MI, SPAdj);
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BuildMI(*MBB, MI, MI->getDebugLoc(),
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TII->get(AMDGPU::V_MOV_B32_e32), TmpReg)
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.addImm(Offset);
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FIOp.ChangeToRegister(TmpReg, false);
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}
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}
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}
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}
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const TargetRegisterClass * SIRegisterInfo::getCFGStructurizerRegClass(
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MVT VT) const {
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switch(VT.SimpleTy) {
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default:
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case MVT::i32: return &AMDGPU::VReg_32RegClass;
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}
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}
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unsigned SIRegisterInfo::getHWRegIndex(unsigned Reg) const {
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return getEncodingValue(Reg) & 0xff;
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}
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const TargetRegisterClass *SIRegisterInfo::getPhysRegClass(unsigned Reg) const {
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assert(!TargetRegisterInfo::isVirtualRegister(Reg));
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static const TargetRegisterClass *BaseClasses[] = {
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&AMDGPU::VReg_32RegClass,
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&AMDGPU::SReg_32RegClass,
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&AMDGPU::VReg_64RegClass,
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&AMDGPU::SReg_64RegClass,
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&AMDGPU::VReg_96RegClass,
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&AMDGPU::VReg_128RegClass,
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&AMDGPU::SReg_128RegClass,
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&AMDGPU::VReg_256RegClass,
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&AMDGPU::SReg_256RegClass,
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&AMDGPU::VReg_512RegClass
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};
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for (const TargetRegisterClass *BaseClass : BaseClasses) {
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if (BaseClass->contains(Reg)) {
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return BaseClass;
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}
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}
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return nullptr;
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}
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bool SIRegisterInfo::hasVGPRs(const TargetRegisterClass *RC) const {
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return getCommonSubClass(&AMDGPU::VReg_32RegClass, RC) ||
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getCommonSubClass(&AMDGPU::VReg_64RegClass, RC) ||
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getCommonSubClass(&AMDGPU::VReg_96RegClass, RC) ||
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getCommonSubClass(&AMDGPU::VReg_128RegClass, RC) ||
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getCommonSubClass(&AMDGPU::VReg_256RegClass, RC) ||
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getCommonSubClass(&AMDGPU::VReg_512RegClass, RC);
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}
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const TargetRegisterClass *SIRegisterInfo::getEquivalentVGPRClass(
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const TargetRegisterClass *SRC) const {
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if (hasVGPRs(SRC)) {
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return SRC;
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} else if (SRC == &AMDGPU::SCCRegRegClass) {
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return &AMDGPU::VCCRegRegClass;
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} else if (getCommonSubClass(SRC, &AMDGPU::SGPR_32RegClass)) {
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return &AMDGPU::VReg_32RegClass;
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} else if (getCommonSubClass(SRC, &AMDGPU::SGPR_64RegClass)) {
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return &AMDGPU::VReg_64RegClass;
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} else if (getCommonSubClass(SRC, &AMDGPU::SReg_128RegClass)) {
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return &AMDGPU::VReg_128RegClass;
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} else if (getCommonSubClass(SRC, &AMDGPU::SReg_256RegClass)) {
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return &AMDGPU::VReg_256RegClass;
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} else if (getCommonSubClass(SRC, &AMDGPU::SReg_512RegClass)) {
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return &AMDGPU::VReg_512RegClass;
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}
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return nullptr;
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}
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const TargetRegisterClass *SIRegisterInfo::getSubRegClass(
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const TargetRegisterClass *RC, unsigned SubIdx) const {
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if (SubIdx == AMDGPU::NoSubRegister)
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return RC;
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// If this register has a sub-register, we can safely assume it is a 32-bit
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// register, because all of SI's sub-registers are 32-bit.
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if (isSGPRClass(RC)) {
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return &AMDGPU::SGPR_32RegClass;
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} else {
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return &AMDGPU::VGPR_32RegClass;
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}
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}
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unsigned SIRegisterInfo::getPhysRegSubReg(unsigned Reg,
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const TargetRegisterClass *SubRC,
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unsigned Channel) const {
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switch (Reg) {
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case AMDGPU::VCC:
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switch(Channel) {
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case 0: return AMDGPU::VCC_LO;
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case 1: return AMDGPU::VCC_HI;
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default: llvm_unreachable("Invalid SubIdx for VCC");
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}
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case AMDGPU::FLAT_SCR:
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switch (Channel) {
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case 0:
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return AMDGPU::FLAT_SCR_LO;
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case 1:
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return AMDGPU::FLAT_SCR_HI;
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default:
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llvm_unreachable("Invalid SubIdx for FLAT_SCR");
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}
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break;
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case AMDGPU::EXEC:
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switch (Channel) {
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case 0:
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return AMDGPU::EXEC_LO;
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case 1:
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return AMDGPU::EXEC_HI;
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default:
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llvm_unreachable("Invalid SubIdx for EXEC");
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}
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break;
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}
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const TargetRegisterClass *RC = getPhysRegClass(Reg);
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// 32-bit registers don't have sub-registers, so we can just return the
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// Reg. We need to have this check here, because the calculation below
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// using getHWRegIndex() will fail with special 32-bit registers like
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// VCC_LO, VCC_HI, EXEC_LO, EXEC_HI and M0.
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if (RC->getSize() == 4) {
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assert(Channel == 0);
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return Reg;
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}
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unsigned Index = getHWRegIndex(Reg);
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return SubRC->getRegister(Index + Channel);
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}
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bool SIRegisterInfo::regClassCanUseLiteralConstant(int RCID) const {
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switch (RCID) {
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default: return false;
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case AMDGPU::SSrc_32RegClassID:
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case AMDGPU::SSrc_64RegClassID:
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case AMDGPU::VSrc_32RegClassID:
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case AMDGPU::VSrc_64RegClassID:
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return true;
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}
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}
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bool SIRegisterInfo::regClassCanUseLiteralConstant(
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const TargetRegisterClass *RC) const {
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return regClassCanUseLiteralConstant(RC->getID());
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}
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bool SIRegisterInfo::regClassCanUseInlineConstant(int RCID) const {
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if (regClassCanUseLiteralConstant(RCID))
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return true;
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switch (RCID) {
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default: return false;
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case AMDGPU::VCSrc_32RegClassID:
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case AMDGPU::VCSrc_64RegClassID:
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case AMDGPU::SCSrc_32RegClassID:
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return true;
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}
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}
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bool SIRegisterInfo::regClassCanUseInlineConstant(
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const TargetRegisterClass *RC) const {
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return regClassCanUseInlineConstant(RC->getID());
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}
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unsigned SIRegisterInfo::getPreloadedValue(const MachineFunction &MF,
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enum PreloadedValue Value) const {
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const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
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switch (Value) {
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case SIRegisterInfo::TGID_X:
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return AMDGPU::SReg_32RegClass.getRegister(MFI->NumUserSGPRs + 0);
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case SIRegisterInfo::TGID_Y:
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return AMDGPU::SReg_32RegClass.getRegister(MFI->NumUserSGPRs + 1);
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case SIRegisterInfo::TGID_Z:
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return AMDGPU::SReg_32RegClass.getRegister(MFI->NumUserSGPRs + 2);
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case SIRegisterInfo::SCRATCH_WAVE_OFFSET:
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return AMDGPU::SReg_32RegClass.getRegister(MFI->NumUserSGPRs + 4);
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case SIRegisterInfo::SCRATCH_PTR:
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return AMDGPU::SGPR2_SGPR3;
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case SIRegisterInfo::INPUT_PTR:
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return AMDGPU::SGPR0_SGPR1;
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case SIRegisterInfo::TIDIG_X:
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return AMDGPU::VGPR0;
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case SIRegisterInfo::TIDIG_Y:
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return AMDGPU::VGPR1;
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case SIRegisterInfo::TIDIG_Z:
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return AMDGPU::VGPR2;
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}
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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;
|
|
}
|
|
|