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classes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231954 91177308-0d34-0410-b5e6-96231b3b80d8
537 lines
18 KiB
C++
537 lines
18 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 "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() : AMDGPURegisterInfo() {}
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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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// Tonga and Iceland can only allocate a fixed number of SGPRs due
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// to a hw bug.
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if (MF.getSubtarget<AMDGPUSubtarget>().hasSGPRInitBug()) {
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unsigned NumSGPRs = AMDGPU::SGPR_32RegClass.getNumRegs();
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// Reserve some SGPRs for FLAT_SCRATCH and VCC (4 SGPRs).
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// Assume XNACK_MASK is unused.
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unsigned Limit = AMDGPUSubtarget::FIXED_SGPR_COUNT_FOR_INIT_BUG - 4;
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for (unsigned i = Limit; i < NumSGPRs; ++i) {
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unsigned Reg = AMDGPU::SGPR_32RegClass.getRegister(i);
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MCRegAliasIterator R = MCRegAliasIterator(Reg, this, true);
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for (; R.isValid(); ++R)
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Reserved.set(*R);
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}
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}
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return Reserved;
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}
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unsigned SIRegisterInfo::getRegPressureSetLimit(const MachineFunction &MF,
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unsigned Idx) const {
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const AMDGPUSubtarget &STI = MF.getSubtarget<AMDGPUSubtarget>();
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// FIXME: We should adjust the max number of waves based on LDS size.
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unsigned SGPRLimit = getNumSGPRsAllowed(STI.getGeneration(),
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STI.getMaxWavesPerCU());
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unsigned VGPRLimit = getNumVGPRsAllowed(STI.getMaxWavesPerCU());
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for (regclass_iterator I = regclass_begin(), E = regclass_end();
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I != E; ++I) {
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unsigned NumSubRegs = std::max((int)(*I)->getSize() / 4, 1);
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unsigned Limit;
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if (isSGPRClass(*I)) {
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Limit = SGPRLimit / NumSubRegs;
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} else {
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Limit = VGPRLimit / NumSubRegs;
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}
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const int *Sets = getRegClassPressureSets(*I);
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assert(Sets);
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for (unsigned i = 0; Sets[i] != -1; ++i) {
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if (Sets[i] == (int)Idx)
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return Limit;
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}
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}
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return 256;
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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::buildScratchLoadStore(MachineBasicBlock::iterator MI,
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unsigned LoadStoreOp,
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unsigned Value,
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unsigned ScratchRsrcReg,
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unsigned ScratchOffset,
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int64_t Offset,
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RegScavenger *RS) const {
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MachineBasicBlock *MBB = MI->getParent();
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const MachineFunction *MF = MI->getParent()->getParent();
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const SIInstrInfo *TII =
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static_cast<const SIInstrInfo *>(MF->getSubtarget().getInstrInfo());
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LLVMContext &Ctx = MF->getFunction()->getContext();
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DebugLoc DL = MI->getDebugLoc();
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bool IsLoad = TII->get(LoadStoreOp).mayLoad();
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bool RanOutOfSGPRs = false;
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unsigned SOffset = ScratchOffset;
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unsigned NumSubRegs = getNumSubRegsForSpillOp(MI->getOpcode());
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unsigned Size = NumSubRegs * 4;
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if (!isUInt<12>(Offset + Size)) {
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SOffset = RS->scavengeRegister(&AMDGPU::SGPR_32RegClass, MI, 0);
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if (SOffset == AMDGPU::NoRegister) {
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RanOutOfSGPRs = true;
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SOffset = AMDGPU::SGPR0;
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}
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BuildMI(*MBB, MI, DL, TII->get(AMDGPU::S_ADD_U32), SOffset)
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.addReg(ScratchOffset)
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.addImm(Offset);
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Offset = 0;
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}
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if (RanOutOfSGPRs)
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Ctx.emitError("Ran out of SGPRs for spilling VGPRS");
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for (unsigned i = 0, e = NumSubRegs; i != e; ++i, Offset += 4) {
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unsigned SubReg = NumSubRegs > 1 ?
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getPhysRegSubReg(Value, &AMDGPU::VGPR_32RegClass, i) :
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Value;
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bool IsKill = (i == e - 1);
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BuildMI(*MBB, MI, DL, TII->get(LoadStoreOp))
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.addReg(SubReg, getDefRegState(IsLoad))
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.addReg(ScratchRsrcReg, getKillRegState(IsKill))
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.addReg(SOffset)
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.addImm(Offset)
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.addImm(0) // glc
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.addImm(0) // slc
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.addImm(0) // tfe
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.addReg(Value, RegState::Implicit | getDefRegState(IsLoad));
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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 =
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static_cast<const SIInstrInfo *>(MF->getSubtarget().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,
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TII->getMCOpcodeFromPseudo(AMDGPU::V_WRITELANE_B32),
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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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BuildMI(*MBB, MI, DL,
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TII->getMCOpcodeFromPseudo(AMDGPU::V_READLANE_B32),
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SubReg)
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.addReg(Spill.VGPR)
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.addImm(Spill.Lane)
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.addReg(MI->getOperand(0).getReg(), RegState::ImplicitDefine);
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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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buildScratchLoadStore(MI, AMDGPU::BUFFER_STORE_DWORD_OFFSET,
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TII->getNamedOperand(*MI, AMDGPU::OpName::src)->getReg(),
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TII->getNamedOperand(*MI, AMDGPU::OpName::scratch_rsrc)->getReg(),
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TII->getNamedOperand(*MI, AMDGPU::OpName::scratch_offset)->getReg(),
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FrameInfo->getObjectOffset(Index), RS);
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MI->eraseFromParent();
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break;
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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_V96_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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buildScratchLoadStore(MI, AMDGPU::BUFFER_LOAD_DWORD_OFFSET,
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TII->getNamedOperand(*MI, AMDGPU::OpName::dst)->getReg(),
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TII->getNamedOperand(*MI, AMDGPU::OpName::scratch_rsrc)->getReg(),
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TII->getNamedOperand(*MI, AMDGPU::OpName::scratch_offset)->getReg(),
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FrameInfo->getObjectOffset(Index), RS);
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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::VGPR_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, false, true);
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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::VGPR_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::VGPR_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::VGPR_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::VGPR_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::opCanUseLiteralConstant(unsigned OpType) const {
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return OpType == AMDGPU::OPERAND_REG_IMM32;
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}
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bool SIRegisterInfo::opCanUseInlineConstant(unsigned OpType) const {
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if (opCanUseLiteralConstant(OpType))
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return true;
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|
|
return OpType == AMDGPU::OPERAND_REG_INLINE_C;
|
|
}
|
|
|
|
unsigned SIRegisterInfo::getPreloadedValue(const MachineFunction &MF,
|
|
enum PreloadedValue Value) const {
|
|
|
|
const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
|
|
switch (Value) {
|
|
case SIRegisterInfo::TGID_X:
|
|
return AMDGPU::SReg_32RegClass.getRegister(MFI->NumUserSGPRs + 0);
|
|
case SIRegisterInfo::TGID_Y:
|
|
return AMDGPU::SReg_32RegClass.getRegister(MFI->NumUserSGPRs + 1);
|
|
case SIRegisterInfo::TGID_Z:
|
|
return AMDGPU::SReg_32RegClass.getRegister(MFI->NumUserSGPRs + 2);
|
|
case SIRegisterInfo::SCRATCH_WAVE_OFFSET:
|
|
if (MFI->getShaderType() != ShaderType::COMPUTE)
|
|
return MFI->ScratchOffsetReg;
|
|
return AMDGPU::SReg_32RegClass.getRegister(MFI->NumUserSGPRs + 4);
|
|
case SIRegisterInfo::SCRATCH_PTR:
|
|
return AMDGPU::SGPR2_SGPR3;
|
|
case SIRegisterInfo::INPUT_PTR:
|
|
return AMDGPU::SGPR0_SGPR1;
|
|
case SIRegisterInfo::TIDIG_X:
|
|
return AMDGPU::VGPR0;
|
|
case SIRegisterInfo::TIDIG_Y:
|
|
return AMDGPU::VGPR1;
|
|
case SIRegisterInfo::TIDIG_Z:
|
|
return AMDGPU::VGPR2;
|
|
}
|
|
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::findUnusedRegister(const MachineRegisterInfo &MRI,
|
|
const TargetRegisterClass *RC) const {
|
|
|
|
for (TargetRegisterClass::iterator I = RC->begin(), E = RC->end();
|
|
I != E; ++I) {
|
|
if (!MRI.isPhysRegUsed(*I))
|
|
return *I;
|
|
}
|
|
return AMDGPU::NoRegister;
|
|
}
|
|
|
|
unsigned SIRegisterInfo::getNumVGPRsAllowed(unsigned WaveCount) const {
|
|
switch(WaveCount) {
|
|
case 10: return 24;
|
|
case 9: return 28;
|
|
case 8: return 32;
|
|
case 7: return 36;
|
|
case 6: return 40;
|
|
case 5: return 48;
|
|
case 4: return 64;
|
|
case 3: return 84;
|
|
case 2: return 128;
|
|
default: return 256;
|
|
}
|
|
}
|
|
|
|
unsigned SIRegisterInfo::getNumSGPRsAllowed(AMDGPUSubtarget::Generation gen,
|
|
unsigned WaveCount) const {
|
|
if (gen >= AMDGPUSubtarget::VOLCANIC_ISLANDS) {
|
|
switch (WaveCount) {
|
|
case 10: return 80;
|
|
case 9: return 80;
|
|
case 8: return 96;
|
|
default: return 102;
|
|
}
|
|
} else {
|
|
switch(WaveCount) {
|
|
case 10: return 48;
|
|
case 9: return 56;
|
|
case 8: return 64;
|
|
case 7: return 72;
|
|
case 6: return 80;
|
|
case 5: return 96;
|
|
default: return 103;
|
|
}
|
|
}
|
|
}
|