| //===-- SIInstrInfo.cpp - SI Instruction Information ---------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| /// \file |
| /// \brief SI Implementation of TargetInstrInfo. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| |
| #include "SIInstrInfo.h" |
| #include "AMDGPUTargetMachine.h" |
| #include "SIDefines.h" |
| #include "SIMachineFunctionInfo.h" |
| #include "llvm/CodeGen/MachineFrameInfo.h" |
| #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" |
| #include "llvm/Support/Debug.h" |
| |
| using namespace llvm; |
| |
| SIInstrInfo::SIInstrInfo(const AMDGPUSubtarget &st) |
| : AMDGPUInstrInfo(st), RI() {} |
| |
| //===----------------------------------------------------------------------===// |
| // TargetInstrInfo callbacks |
| //===----------------------------------------------------------------------===// |
| |
| static unsigned getNumOperandsNoGlue(SDNode *Node) { |
| unsigned N = Node->getNumOperands(); |
| while (N && Node->getOperand(N - 1).getValueType() == MVT::Glue) |
| --N; |
| return N; |
| } |
| |
| static SDValue findChainOperand(SDNode *Load) { |
| SDValue LastOp = Load->getOperand(getNumOperandsNoGlue(Load) - 1); |
| assert(LastOp.getValueType() == MVT::Other && "Chain missing from load node"); |
| return LastOp; |
| } |
| |
| /// \brief Returns true if both nodes have the same value for the given |
| /// operand \p Op, or if both nodes do not have this operand. |
| static bool nodesHaveSameOperandValue(SDNode *N0, SDNode* N1, unsigned OpName) { |
| unsigned Opc0 = N0->getMachineOpcode(); |
| unsigned Opc1 = N1->getMachineOpcode(); |
| |
| int Op0Idx = AMDGPU::getNamedOperandIdx(Opc0, OpName); |
| int Op1Idx = AMDGPU::getNamedOperandIdx(Opc1, OpName); |
| |
| if (Op0Idx == -1 && Op1Idx == -1) |
| return true; |
| |
| |
| if ((Op0Idx == -1 && Op1Idx != -1) || |
| (Op1Idx == -1 && Op0Idx != -1)) |
| return false; |
| |
| // getNamedOperandIdx returns the index for the MachineInstr's operands, |
| // which includes the result as the first operand. We are indexing into the |
| // MachineSDNode's operands, so we need to skip the result operand to get |
| // the real index. |
| --Op0Idx; |
| --Op1Idx; |
| |
| return N0->getOperand(Op0Idx) == N1->getOperand(Op1Idx); |
| } |
| |
| bool SIInstrInfo::isReallyTriviallyReMaterializable(const MachineInstr *MI, |
| AliasAnalysis *AA) const { |
| // TODO: The generic check fails for VALU instructions that should be |
| // rematerializable due to implicit reads of exec. We really want all of the |
| // generic logic for this except for this. |
| switch (MI->getOpcode()) { |
| case AMDGPU::V_MOV_B32_e32: |
| case AMDGPU::V_MOV_B32_e64: |
| case AMDGPU::V_MOV_B64_PSEUDO: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| bool SIInstrInfo::areLoadsFromSameBasePtr(SDNode *Load0, SDNode *Load1, |
| int64_t &Offset0, |
| int64_t &Offset1) const { |
| if (!Load0->isMachineOpcode() || !Load1->isMachineOpcode()) |
| return false; |
| |
| unsigned Opc0 = Load0->getMachineOpcode(); |
| unsigned Opc1 = Load1->getMachineOpcode(); |
| |
| // Make sure both are actually loads. |
| if (!get(Opc0).mayLoad() || !get(Opc1).mayLoad()) |
| return false; |
| |
| if (isDS(Opc0) && isDS(Opc1)) { |
| |
| // FIXME: Handle this case: |
| if (getNumOperandsNoGlue(Load0) != getNumOperandsNoGlue(Load1)) |
| return false; |
| |
| // Check base reg. |
| if (Load0->getOperand(1) != Load1->getOperand(1)) |
| return false; |
| |
| // Check chain. |
| if (findChainOperand(Load0) != findChainOperand(Load1)) |
| return false; |
| |
| // Skip read2 / write2 variants for simplicity. |
| // TODO: We should report true if the used offsets are adjacent (excluded |
| // st64 versions). |
| if (AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::data1) != -1 || |
| AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::data1) != -1) |
| return false; |
| |
| Offset0 = cast<ConstantSDNode>(Load0->getOperand(2))->getZExtValue(); |
| Offset1 = cast<ConstantSDNode>(Load1->getOperand(2))->getZExtValue(); |
| return true; |
| } |
| |
| if (isSMRD(Opc0) && isSMRD(Opc1)) { |
| assert(getNumOperandsNoGlue(Load0) == getNumOperandsNoGlue(Load1)); |
| |
| // Check base reg. |
| if (Load0->getOperand(0) != Load1->getOperand(0)) |
| return false; |
| |
| const ConstantSDNode *Load0Offset = |
| dyn_cast<ConstantSDNode>(Load0->getOperand(1)); |
| const ConstantSDNode *Load1Offset = |
| dyn_cast<ConstantSDNode>(Load1->getOperand(1)); |
| |
| if (!Load0Offset || !Load1Offset) |
| return false; |
| |
| // Check chain. |
| if (findChainOperand(Load0) != findChainOperand(Load1)) |
| return false; |
| |
| Offset0 = Load0Offset->getZExtValue(); |
| Offset1 = Load1Offset->getZExtValue(); |
| return true; |
| } |
| |
| // MUBUF and MTBUF can access the same addresses. |
| if ((isMUBUF(Opc0) || isMTBUF(Opc0)) && (isMUBUF(Opc1) || isMTBUF(Opc1))) { |
| |
| // MUBUF and MTBUF have vaddr at different indices. |
| if (!nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::soffset) || |
| findChainOperand(Load0) != findChainOperand(Load1) || |
| !nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::vaddr) || |
| !nodesHaveSameOperandValue(Load0, Load1, AMDGPU::OpName::srsrc)) |
| return false; |
| |
| int OffIdx0 = AMDGPU::getNamedOperandIdx(Opc0, AMDGPU::OpName::offset); |
| int OffIdx1 = AMDGPU::getNamedOperandIdx(Opc1, AMDGPU::OpName::offset); |
| |
| if (OffIdx0 == -1 || OffIdx1 == -1) |
| return false; |
| |
| // getNamedOperandIdx returns the index for MachineInstrs. Since they |
| // inlcude the output in the operand list, but SDNodes don't, we need to |
| // subtract the index by one. |
| --OffIdx0; |
| --OffIdx1; |
| |
| SDValue Off0 = Load0->getOperand(OffIdx0); |
| SDValue Off1 = Load1->getOperand(OffIdx1); |
| |
| // The offset might be a FrameIndexSDNode. |
| if (!isa<ConstantSDNode>(Off0) || !isa<ConstantSDNode>(Off1)) |
| return false; |
| |
| Offset0 = cast<ConstantSDNode>(Off0)->getZExtValue(); |
| Offset1 = cast<ConstantSDNode>(Off1)->getZExtValue(); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static bool isStride64(unsigned Opc) { |
| switch (Opc) { |
| case AMDGPU::DS_READ2ST64_B32: |
| case AMDGPU::DS_READ2ST64_B64: |
| case AMDGPU::DS_WRITE2ST64_B32: |
| case AMDGPU::DS_WRITE2ST64_B64: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| bool SIInstrInfo::getMemOpBaseRegImmOfs(MachineInstr *LdSt, unsigned &BaseReg, |
| unsigned &Offset, |
| const TargetRegisterInfo *TRI) const { |
| unsigned Opc = LdSt->getOpcode(); |
| |
| if (isDS(*LdSt)) { |
| const MachineOperand *OffsetImm = getNamedOperand(*LdSt, |
| AMDGPU::OpName::offset); |
| if (OffsetImm) { |
| // Normal, single offset LDS instruction. |
| const MachineOperand *AddrReg = getNamedOperand(*LdSt, |
| AMDGPU::OpName::addr); |
| |
| BaseReg = AddrReg->getReg(); |
| Offset = OffsetImm->getImm(); |
| return true; |
| } |
| |
| // The 2 offset instructions use offset0 and offset1 instead. We can treat |
| // these as a load with a single offset if the 2 offsets are consecutive. We |
| // will use this for some partially aligned loads. |
| const MachineOperand *Offset0Imm = getNamedOperand(*LdSt, |
| AMDGPU::OpName::offset0); |
| const MachineOperand *Offset1Imm = getNamedOperand(*LdSt, |
| AMDGPU::OpName::offset1); |
| |
| uint8_t Offset0 = Offset0Imm->getImm(); |
| uint8_t Offset1 = Offset1Imm->getImm(); |
| |
| if (Offset1 > Offset0 && Offset1 - Offset0 == 1) { |
| // Each of these offsets is in element sized units, so we need to convert |
| // to bytes of the individual reads. |
| |
| unsigned EltSize; |
| if (LdSt->mayLoad()) |
| EltSize = getOpRegClass(*LdSt, 0)->getSize() / 2; |
| else { |
| assert(LdSt->mayStore()); |
| int Data0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::data0); |
| EltSize = getOpRegClass(*LdSt, Data0Idx)->getSize(); |
| } |
| |
| if (isStride64(Opc)) |
| EltSize *= 64; |
| |
| const MachineOperand *AddrReg = getNamedOperand(*LdSt, |
| AMDGPU::OpName::addr); |
| BaseReg = AddrReg->getReg(); |
| Offset = EltSize * Offset0; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| if (isMUBUF(*LdSt) || isMTBUF(*LdSt)) { |
| if (AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::soffset) != -1) |
| return false; |
| |
| const MachineOperand *AddrReg = getNamedOperand(*LdSt, |
| AMDGPU::OpName::vaddr); |
| if (!AddrReg) |
| return false; |
| |
| const MachineOperand *OffsetImm = getNamedOperand(*LdSt, |
| AMDGPU::OpName::offset); |
| BaseReg = AddrReg->getReg(); |
| Offset = OffsetImm->getImm(); |
| return true; |
| } |
| |
| if (isSMRD(*LdSt)) { |
| const MachineOperand *OffsetImm = getNamedOperand(*LdSt, |
| AMDGPU::OpName::offset); |
| if (!OffsetImm) |
| return false; |
| |
| const MachineOperand *SBaseReg = getNamedOperand(*LdSt, |
| AMDGPU::OpName::sbase); |
| BaseReg = SBaseReg->getReg(); |
| Offset = OffsetImm->getImm(); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool SIInstrInfo::shouldClusterLoads(MachineInstr *FirstLdSt, |
| MachineInstr *SecondLdSt, |
| unsigned NumLoads) const { |
| // TODO: This needs finer tuning |
| if (NumLoads > 4) |
| return false; |
| |
| if (isDS(*FirstLdSt) && isDS(*SecondLdSt)) |
| return true; |
| |
| if (isSMRD(*FirstLdSt) && isSMRD(*SecondLdSt)) |
| return true; |
| |
| if ((isMUBUF(*FirstLdSt) || isMTBUF(*FirstLdSt)) && |
| (isMUBUF(*SecondLdSt) || isMTBUF(*SecondLdSt))) |
| return true; |
| |
| return false; |
| } |
| |
| void |
| SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI, DebugLoc DL, |
| unsigned DestReg, unsigned SrcReg, |
| bool KillSrc) const { |
| |
| // If we are trying to copy to or from SCC, there is a bug somewhere else in |
| // the backend. While it may be theoretically possible to do this, it should |
| // never be necessary. |
| assert(DestReg != AMDGPU::SCC && SrcReg != AMDGPU::SCC); |
| |
| static const int16_t Sub0_15[] = { |
| AMDGPU::sub0, AMDGPU::sub1, AMDGPU::sub2, AMDGPU::sub3, |
| AMDGPU::sub4, AMDGPU::sub5, AMDGPU::sub6, AMDGPU::sub7, |
| AMDGPU::sub8, AMDGPU::sub9, AMDGPU::sub10, AMDGPU::sub11, |
| AMDGPU::sub12, AMDGPU::sub13, AMDGPU::sub14, AMDGPU::sub15, |
| }; |
| |
| static const int16_t Sub0_15_64[] = { |
| AMDGPU::sub0_sub1, AMDGPU::sub2_sub3, |
| AMDGPU::sub4_sub5, AMDGPU::sub6_sub7, |
| AMDGPU::sub8_sub9, AMDGPU::sub10_sub11, |
| AMDGPU::sub12_sub13, AMDGPU::sub14_sub15, |
| }; |
| |
| static const int16_t Sub0_7[] = { |
| AMDGPU::sub0, AMDGPU::sub1, AMDGPU::sub2, AMDGPU::sub3, |
| AMDGPU::sub4, AMDGPU::sub5, AMDGPU::sub6, AMDGPU::sub7, |
| }; |
| |
| static const int16_t Sub0_7_64[] = { |
| AMDGPU::sub0_sub1, AMDGPU::sub2_sub3, |
| AMDGPU::sub4_sub5, AMDGPU::sub6_sub7, |
| }; |
| |
| static const int16_t Sub0_3[] = { |
| AMDGPU::sub0, AMDGPU::sub1, AMDGPU::sub2, AMDGPU::sub3, |
| }; |
| |
| static const int16_t Sub0_3_64[] = { |
| AMDGPU::sub0_sub1, AMDGPU::sub2_sub3, |
| }; |
| |
| static const int16_t Sub0_2[] = { |
| AMDGPU::sub0, AMDGPU::sub1, AMDGPU::sub2, |
| }; |
| |
| static const int16_t Sub0_1[] = { |
| AMDGPU::sub0, AMDGPU::sub1, |
| }; |
| |
| unsigned Opcode; |
| ArrayRef<int16_t> SubIndices; |
| bool Forward; |
| |
| if (AMDGPU::SReg_32RegClass.contains(DestReg)) { |
| assert(AMDGPU::SReg_32RegClass.contains(SrcReg)); |
| BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DestReg) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| return; |
| |
| } else if (AMDGPU::SReg_64RegClass.contains(DestReg)) { |
| if (DestReg == AMDGPU::VCC) { |
| if (AMDGPU::SReg_64RegClass.contains(SrcReg)) { |
| BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), AMDGPU::VCC) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| } else { |
| // FIXME: Hack until VReg_1 removed. |
| assert(AMDGPU::VGPR_32RegClass.contains(SrcReg)); |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_CMP_NE_I32_e32)) |
| .addImm(0) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| } |
| |
| return; |
| } |
| |
| assert(AMDGPU::SReg_64RegClass.contains(SrcReg)); |
| BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), DestReg) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| return; |
| |
| } else if (AMDGPU::SReg_128RegClass.contains(DestReg)) { |
| assert(AMDGPU::SReg_128RegClass.contains(SrcReg)); |
| Opcode = AMDGPU::S_MOV_B64; |
| SubIndices = Sub0_3_64; |
| |
| } else if (AMDGPU::SReg_256RegClass.contains(DestReg)) { |
| assert(AMDGPU::SReg_256RegClass.contains(SrcReg)); |
| Opcode = AMDGPU::S_MOV_B64; |
| SubIndices = Sub0_7_64; |
| |
| } else if (AMDGPU::SReg_512RegClass.contains(DestReg)) { |
| assert(AMDGPU::SReg_512RegClass.contains(SrcReg)); |
| Opcode = AMDGPU::S_MOV_B64; |
| SubIndices = Sub0_15_64; |
| |
| } else if (AMDGPU::VGPR_32RegClass.contains(DestReg)) { |
| assert(AMDGPU::VGPR_32RegClass.contains(SrcReg) || |
| AMDGPU::SReg_32RegClass.contains(SrcReg)); |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DestReg) |
| .addReg(SrcReg, getKillRegState(KillSrc)); |
| return; |
| |
| } else if (AMDGPU::VReg_64RegClass.contains(DestReg)) { |
| assert(AMDGPU::VReg_64RegClass.contains(SrcReg) || |
| AMDGPU::SReg_64RegClass.contains(SrcReg)); |
| Opcode = AMDGPU::V_MOV_B32_e32; |
| SubIndices = Sub0_1; |
| |
| } else if (AMDGPU::VReg_96RegClass.contains(DestReg)) { |
| assert(AMDGPU::VReg_96RegClass.contains(SrcReg)); |
| Opcode = AMDGPU::V_MOV_B32_e32; |
| SubIndices = Sub0_2; |
| |
| } else if (AMDGPU::VReg_128RegClass.contains(DestReg)) { |
| assert(AMDGPU::VReg_128RegClass.contains(SrcReg) || |
| AMDGPU::SReg_128RegClass.contains(SrcReg)); |
| Opcode = AMDGPU::V_MOV_B32_e32; |
| SubIndices = Sub0_3; |
| |
| } else if (AMDGPU::VReg_256RegClass.contains(DestReg)) { |
| assert(AMDGPU::VReg_256RegClass.contains(SrcReg) || |
| AMDGPU::SReg_256RegClass.contains(SrcReg)); |
| Opcode = AMDGPU::V_MOV_B32_e32; |
| SubIndices = Sub0_7; |
| |
| } else if (AMDGPU::VReg_512RegClass.contains(DestReg)) { |
| assert(AMDGPU::VReg_512RegClass.contains(SrcReg) || |
| AMDGPU::SReg_512RegClass.contains(SrcReg)); |
| Opcode = AMDGPU::V_MOV_B32_e32; |
| SubIndices = Sub0_15; |
| |
| } else { |
| llvm_unreachable("Can't copy register!"); |
| } |
| |
| if (RI.getHWRegIndex(DestReg) <= RI.getHWRegIndex(SrcReg)) |
| Forward = true; |
| else |
| Forward = false; |
| |
| for (unsigned Idx = 0; Idx < SubIndices.size(); ++Idx) { |
| unsigned SubIdx; |
| if (Forward) |
| SubIdx = SubIndices[Idx]; |
| else |
| SubIdx = SubIndices[SubIndices.size() - Idx - 1]; |
| |
| MachineInstrBuilder Builder = BuildMI(MBB, MI, DL, |
| get(Opcode), RI.getSubReg(DestReg, SubIdx)); |
| |
| Builder.addReg(RI.getSubReg(SrcReg, SubIdx)); |
| |
| if (Idx == SubIndices.size() - 1) |
| Builder.addReg(SrcReg, RegState::Kill | RegState::Implicit); |
| |
| if (Idx == 0) |
| Builder.addReg(DestReg, RegState::Define | RegState::Implicit); |
| } |
| } |
| |
| int SIInstrInfo::commuteOpcode(const MachineInstr &MI) const { |
| const unsigned Opcode = MI.getOpcode(); |
| |
| int NewOpc; |
| |
| // Try to map original to commuted opcode |
| NewOpc = AMDGPU::getCommuteRev(Opcode); |
| if (NewOpc != -1) |
| // Check if the commuted (REV) opcode exists on the target. |
| return pseudoToMCOpcode(NewOpc) != -1 ? NewOpc : -1; |
| |
| // Try to map commuted to original opcode |
| NewOpc = AMDGPU::getCommuteOrig(Opcode); |
| if (NewOpc != -1) |
| // Check if the original (non-REV) opcode exists on the target. |
| return pseudoToMCOpcode(NewOpc) != -1 ? NewOpc : -1; |
| |
| return Opcode; |
| } |
| |
| unsigned SIInstrInfo::getMovOpcode(const TargetRegisterClass *DstRC) const { |
| |
| if (DstRC->getSize() == 4) { |
| return RI.isSGPRClass(DstRC) ? AMDGPU::S_MOV_B32 : AMDGPU::V_MOV_B32_e32; |
| } else if (DstRC->getSize() == 8 && RI.isSGPRClass(DstRC)) { |
| return AMDGPU::S_MOV_B64; |
| } else if (DstRC->getSize() == 8 && !RI.isSGPRClass(DstRC)) { |
| return AMDGPU::V_MOV_B64_PSEUDO; |
| } |
| return AMDGPU::COPY; |
| } |
| |
| static unsigned getSGPRSpillSaveOpcode(unsigned Size) { |
| switch (Size) { |
| case 4: |
| return AMDGPU::SI_SPILL_S32_SAVE; |
| case 8: |
| return AMDGPU::SI_SPILL_S64_SAVE; |
| case 16: |
| return AMDGPU::SI_SPILL_S128_SAVE; |
| case 32: |
| return AMDGPU::SI_SPILL_S256_SAVE; |
| case 64: |
| return AMDGPU::SI_SPILL_S512_SAVE; |
| default: |
| llvm_unreachable("unknown register size"); |
| } |
| } |
| |
| static unsigned getVGPRSpillSaveOpcode(unsigned Size) { |
| switch (Size) { |
| case 4: |
| return AMDGPU::SI_SPILL_V32_SAVE; |
| case 8: |
| return AMDGPU::SI_SPILL_V64_SAVE; |
| case 16: |
| return AMDGPU::SI_SPILL_V128_SAVE; |
| case 32: |
| return AMDGPU::SI_SPILL_V256_SAVE; |
| case 64: |
| return AMDGPU::SI_SPILL_V512_SAVE; |
| default: |
| llvm_unreachable("unknown register size"); |
| } |
| } |
| |
| void SIInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI, |
| unsigned SrcReg, bool isKill, |
| int FrameIndex, |
| const TargetRegisterClass *RC, |
| const TargetRegisterInfo *TRI) const { |
| MachineFunction *MF = MBB.getParent(); |
| SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>(); |
| MachineFrameInfo *FrameInfo = MF->getFrameInfo(); |
| DebugLoc DL = MBB.findDebugLoc(MI); |
| |
| unsigned Size = FrameInfo->getObjectSize(FrameIndex); |
| unsigned Align = FrameInfo->getObjectAlignment(FrameIndex); |
| MachinePointerInfo PtrInfo |
| = MachinePointerInfo::getFixedStack(*MF, FrameIndex); |
| MachineMemOperand *MMO |
| = MF->getMachineMemOperand(PtrInfo, MachineMemOperand::MOStore, |
| Size, Align); |
| |
| if (RI.isSGPRClass(RC)) { |
| MFI->setHasSpilledSGPRs(); |
| |
| // We are only allowed to create one new instruction when spilling |
| // registers, so we need to use pseudo instruction for spilling |
| // SGPRs. |
| unsigned Opcode = getSGPRSpillSaveOpcode(RC->getSize()); |
| BuildMI(MBB, MI, DL, get(Opcode)) |
| .addReg(SrcReg) // src |
| .addFrameIndex(FrameIndex) // frame_idx |
| .addMemOperand(MMO); |
| |
| return; |
| } |
| |
| if (!ST.isVGPRSpillingEnabled(MFI)) { |
| LLVMContext &Ctx = MF->getFunction()->getContext(); |
| Ctx.emitError("SIInstrInfo::storeRegToStackSlot - Do not know how to" |
| " spill register"); |
| BuildMI(MBB, MI, DL, get(AMDGPU::KILL)) |
| .addReg(SrcReg); |
| |
| return; |
| } |
| |
| assert(RI.hasVGPRs(RC) && "Only VGPR spilling expected"); |
| |
| unsigned Opcode = getVGPRSpillSaveOpcode(RC->getSize()); |
| MFI->setHasSpilledVGPRs(); |
| BuildMI(MBB, MI, DL, get(Opcode)) |
| .addReg(SrcReg) // src |
| .addFrameIndex(FrameIndex) // frame_idx |
| .addReg(MFI->getScratchRSrcReg()) // scratch_rsrc |
| .addReg(MFI->getScratchWaveOffsetReg()) // scratch_offset |
| .addMemOperand(MMO); |
| } |
| |
| static unsigned getSGPRSpillRestoreOpcode(unsigned Size) { |
| switch (Size) { |
| case 4: |
| return AMDGPU::SI_SPILL_S32_RESTORE; |
| case 8: |
| return AMDGPU::SI_SPILL_S64_RESTORE; |
| case 16: |
| return AMDGPU::SI_SPILL_S128_RESTORE; |
| case 32: |
| return AMDGPU::SI_SPILL_S256_RESTORE; |
| case 64: |
| return AMDGPU::SI_SPILL_S512_RESTORE; |
| default: |
| llvm_unreachable("unknown register size"); |
| } |
| } |
| |
| static unsigned getVGPRSpillRestoreOpcode(unsigned Size) { |
| switch (Size) { |
| case 4: |
| return AMDGPU::SI_SPILL_V32_RESTORE; |
| case 8: |
| return AMDGPU::SI_SPILL_V64_RESTORE; |
| case 16: |
| return AMDGPU::SI_SPILL_V128_RESTORE; |
| case 32: |
| return AMDGPU::SI_SPILL_V256_RESTORE; |
| case 64: |
| return AMDGPU::SI_SPILL_V512_RESTORE; |
| default: |
| llvm_unreachable("unknown register size"); |
| } |
| } |
| |
| void SIInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI, |
| unsigned DestReg, int FrameIndex, |
| const TargetRegisterClass *RC, |
| const TargetRegisterInfo *TRI) const { |
| MachineFunction *MF = MBB.getParent(); |
| const SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>(); |
| MachineFrameInfo *FrameInfo = MF->getFrameInfo(); |
| DebugLoc DL = MBB.findDebugLoc(MI); |
| unsigned Align = FrameInfo->getObjectAlignment(FrameIndex); |
| unsigned Size = FrameInfo->getObjectSize(FrameIndex); |
| |
| MachinePointerInfo PtrInfo |
| = MachinePointerInfo::getFixedStack(*MF, FrameIndex); |
| |
| MachineMemOperand *MMO = MF->getMachineMemOperand( |
| PtrInfo, MachineMemOperand::MOLoad, Size, Align); |
| |
| if (RI.isSGPRClass(RC)) { |
| // FIXME: Maybe this should not include a memoperand because it will be |
| // lowered to non-memory instructions. |
| unsigned Opcode = getSGPRSpillRestoreOpcode(RC->getSize()); |
| BuildMI(MBB, MI, DL, get(Opcode), DestReg) |
| .addFrameIndex(FrameIndex) // frame_idx |
| .addMemOperand(MMO); |
| |
| return; |
| } |
| |
| if (!ST.isVGPRSpillingEnabled(MFI)) { |
| LLVMContext &Ctx = MF->getFunction()->getContext(); |
| Ctx.emitError("SIInstrInfo::loadRegFromStackSlot - Do not know how to" |
| " restore register"); |
| BuildMI(MBB, MI, DL, get(AMDGPU::IMPLICIT_DEF), DestReg); |
| |
| return; |
| } |
| |
| assert(RI.hasVGPRs(RC) && "Only VGPR spilling expected"); |
| |
| unsigned Opcode = getVGPRSpillRestoreOpcode(RC->getSize()); |
| BuildMI(MBB, MI, DL, get(Opcode), DestReg) |
| .addFrameIndex(FrameIndex) // frame_idx |
| .addReg(MFI->getScratchRSrcReg()) // scratch_rsrc |
| .addReg(MFI->getScratchWaveOffsetReg()) // scratch_offset |
| .addMemOperand(MMO); |
| } |
| |
| /// \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->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.findUnusedRegister(MF->getRegInfo(), &AMDGPU::VGPR_32RegClass); |
| if (TIDReg == AMDGPU::NoRegister) |
| return TIDReg; |
| |
| |
| if (MFI->getShaderType() == ShaderType::COMPUTE && |
| WorkGroupSize > WavefrontSize) { |
| |
| unsigned TIDIGXReg |
| = TRI->getPreloadedValue(*MF, SIRegisterInfo::WORKGROUP_ID_X); |
| unsigned TIDIGYReg |
| = TRI->getPreloadedValue(*MF, SIRegisterInfo::WORKGROUP_ID_Y); |
| unsigned TIDIGZReg |
| = TRI->getPreloadedValue(*MF, SIRegisterInfo::WORKGROUP_ID_Z); |
| unsigned InputPtrReg = |
| TRI->getPreloadedValue(*MF, SIRegisterInfo::KERNARG_SEGMENT_PTR); |
| for (unsigned Reg : {TIDIGXReg, TIDIGYReg, TIDIGZReg}) { |
| if (!Entry.isLiveIn(Reg)) |
| Entry.addLiveIn(Reg); |
| } |
| |
| RS->enterBasicBlock(&Entry); |
| // FIXME: Can we scavenge an SReg_64 and access the subregs? |
| 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_e64), |
| 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::insertWaitStates(MachineBasicBlock::iterator MI, |
| int Count) const { |
| while (Count > 0) { |
| int Arg; |
| if (Count >= 8) |
| Arg = 7; |
| else |
| Arg = Count - 1; |
| Count -= 8; |
| BuildMI(*MI->getParent(), MI, MI->getDebugLoc(), get(AMDGPU::S_NOP)) |
| .addImm(Arg); |
| } |
| } |
| |
| bool SIInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const { |
| MachineBasicBlock &MBB = *MI->getParent(); |
| DebugLoc DL = MBB.findDebugLoc(MI); |
| switch (MI->getOpcode()) { |
| default: return AMDGPUInstrInfo::expandPostRAPseudo(MI); |
| |
| case AMDGPU::SGPR_USE: |
| // This is just a placeholder for register allocation. |
| MI->eraseFromParent(); |
| break; |
| |
| case AMDGPU::V_MOV_B64_PSEUDO: { |
| unsigned Dst = MI->getOperand(0).getReg(); |
| unsigned DstLo = RI.getSubReg(Dst, AMDGPU::sub0); |
| unsigned DstHi = RI.getSubReg(Dst, AMDGPU::sub1); |
| |
| const MachineOperand &SrcOp = MI->getOperand(1); |
| // FIXME: Will this work for 64-bit floating point immediates? |
| assert(!SrcOp.isFPImm()); |
| if (SrcOp.isImm()) { |
| APInt Imm(64, SrcOp.getImm()); |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstLo) |
| .addImm(Imm.getLoBits(32).getZExtValue()) |
| .addReg(Dst, RegState::Implicit); |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstHi) |
| .addImm(Imm.getHiBits(32).getZExtValue()) |
| .addReg(Dst, RegState::Implicit); |
| } else { |
| assert(SrcOp.isReg()); |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstLo) |
| .addReg(RI.getSubReg(SrcOp.getReg(), AMDGPU::sub0)) |
| .addReg(Dst, RegState::Implicit); |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_MOV_B32_e32), DstHi) |
| .addReg(RI.getSubReg(SrcOp.getReg(), AMDGPU::sub1)) |
| .addReg(Dst, RegState::Implicit); |
| } |
| MI->eraseFromParent(); |
| break; |
| } |
| |
| case AMDGPU::V_CNDMASK_B64_PSEUDO: { |
| unsigned Dst = MI->getOperand(0).getReg(); |
| unsigned DstLo = RI.getSubReg(Dst, AMDGPU::sub0); |
| unsigned DstHi = RI.getSubReg(Dst, AMDGPU::sub1); |
| unsigned Src0 = MI->getOperand(1).getReg(); |
| unsigned Src1 = MI->getOperand(2).getReg(); |
| const MachineOperand &SrcCond = MI->getOperand(3); |
| |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstLo) |
| .addReg(RI.getSubReg(Src0, AMDGPU::sub0)) |
| .addReg(RI.getSubReg(Src1, AMDGPU::sub0)) |
| .addOperand(SrcCond); |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_CNDMASK_B32_e64), DstHi) |
| .addReg(RI.getSubReg(Src0, AMDGPU::sub1)) |
| .addReg(RI.getSubReg(Src1, AMDGPU::sub1)) |
| .addOperand(SrcCond); |
| MI->eraseFromParent(); |
| break; |
| } |
| |
| case AMDGPU::SI_CONSTDATA_PTR: { |
| const SIRegisterInfo *TRI = |
| static_cast<const SIRegisterInfo *>(ST.getRegisterInfo()); |
| MachineFunction &MF = *MBB.getParent(); |
| unsigned Reg = MI->getOperand(0).getReg(); |
| unsigned RegLo = TRI->getSubReg(Reg, AMDGPU::sub0); |
| unsigned RegHi = TRI->getSubReg(Reg, AMDGPU::sub1); |
| |
| // Create a bundle so these instructions won't be re-ordered by the |
| // post-RA scheduler. |
| MIBundleBuilder Bundler(MBB, MI); |
| Bundler.append(BuildMI(MF, DL, get(AMDGPU::S_GETPC_B64), Reg)); |
| |
| // Add 32-bit offset from this instruction to the start of the |
| // constant data. |
| Bundler.append(BuildMI(MF, DL, get(AMDGPU::S_ADD_U32), RegLo) |
| .addReg(RegLo) |
| .addOperand(MI->getOperand(1))); |
| Bundler.append(BuildMI(MF, DL, get(AMDGPU::S_ADDC_U32), RegHi) |
| .addReg(RegHi) |
| .addImm(0)); |
| |
| llvm::finalizeBundle(MBB, Bundler.begin()); |
| |
| MI->eraseFromParent(); |
| break; |
| } |
| } |
| return true; |
| } |
| |
| /// Commutes the operands in the given instruction. |
| /// The commutable operands are specified by their indices OpIdx0 and OpIdx1. |
| /// |
| /// Do not call this method for a non-commutable instruction or for |
| /// non-commutable pair of operand indices OpIdx0 and OpIdx1. |
| /// Even though the instruction is commutable, the method may still |
| /// fail to commute the operands, null pointer is returned in such cases. |
| MachineInstr *SIInstrInfo::commuteInstructionImpl(MachineInstr *MI, |
| bool NewMI, |
| unsigned OpIdx0, |
| unsigned OpIdx1) const { |
| int CommutedOpcode = commuteOpcode(*MI); |
| if (CommutedOpcode == -1) |
| return nullptr; |
| |
| int Src0Idx = AMDGPU::getNamedOperandIdx(MI->getOpcode(), |
| AMDGPU::OpName::src0); |
| MachineOperand &Src0 = MI->getOperand(Src0Idx); |
| if (!Src0.isReg()) |
| return nullptr; |
| |
| int Src1Idx = AMDGPU::getNamedOperandIdx(MI->getOpcode(), |
| AMDGPU::OpName::src1); |
| |
| if ((OpIdx0 != static_cast<unsigned>(Src0Idx) || |
| OpIdx1 != static_cast<unsigned>(Src1Idx)) && |
| (OpIdx0 != static_cast<unsigned>(Src1Idx) || |
| OpIdx1 != static_cast<unsigned>(Src0Idx))) |
| return nullptr; |
| |
| MachineOperand &Src1 = MI->getOperand(Src1Idx); |
| |
| |
| if (isVOP2(*MI)) { |
| const MCInstrDesc &InstrDesc = MI->getDesc(); |
| // For VOP2 instructions, any operand type is valid to use for src0. Make |
| // sure we can use the src1 as src0. |
| // |
| // We could be stricter here and only allow commuting if there is a reason |
| // to do so. i.e. if both operands are VGPRs there is no real benefit, |
| // although MachineCSE attempts to find matches by commuting. |
| const MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo(); |
| if (!isLegalRegOperand(MRI, InstrDesc.OpInfo[Src1Idx], Src0)) |
| return nullptr; |
| } |
| |
| if (!Src1.isReg()) { |
| // Allow commuting instructions with Imm operands. |
| if (NewMI || !Src1.isImm() || |
| (!isVOP2(*MI) && !isVOP3(*MI))) { |
| return nullptr; |
| } |
| // Be sure to copy the source modifiers to the right place. |
| if (MachineOperand *Src0Mods |
| = getNamedOperand(*MI, AMDGPU::OpName::src0_modifiers)) { |
| MachineOperand *Src1Mods |
| = getNamedOperand(*MI, AMDGPU::OpName::src1_modifiers); |
| |
| int Src0ModsVal = Src0Mods->getImm(); |
| if (!Src1Mods && Src0ModsVal != 0) |
| return nullptr; |
| |
| // XXX - This assert might be a lie. It might be useful to have a neg |
| // modifier with 0.0. |
| int Src1ModsVal = Src1Mods->getImm(); |
| assert((Src1ModsVal == 0) && "Not expecting modifiers with immediates"); |
| |
| Src1Mods->setImm(Src0ModsVal); |
| Src0Mods->setImm(Src1ModsVal); |
| } |
| |
| unsigned Reg = Src0.getReg(); |
| unsigned SubReg = Src0.getSubReg(); |
| if (Src1.isImm()) |
| Src0.ChangeToImmediate(Src1.getImm()); |
| else |
| llvm_unreachable("Should only have immediates"); |
| |
| Src1.ChangeToRegister(Reg, false); |
| Src1.setSubReg(SubReg); |
| } else { |
| MI = TargetInstrInfo::commuteInstructionImpl(MI, NewMI, OpIdx0, OpIdx1); |
| } |
| |
| if (MI) |
| MI->setDesc(get(CommutedOpcode)); |
| |
| return MI; |
| } |
| |
| // This needs to be implemented because the source modifiers may be inserted |
| // between the true commutable operands, and the base |
| // TargetInstrInfo::commuteInstruction uses it. |
| bool SIInstrInfo::findCommutedOpIndices(MachineInstr *MI, |
| unsigned &SrcOpIdx0, |
| unsigned &SrcOpIdx1) const { |
| const MCInstrDesc &MCID = MI->getDesc(); |
| if (!MCID.isCommutable()) |
| return false; |
| |
| unsigned Opc = MI->getOpcode(); |
| int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0); |
| if (Src0Idx == -1) |
| return false; |
| |
| // FIXME: Workaround TargetInstrInfo::commuteInstruction asserting on |
| // immediate. Also, immediate src0 operand is not handled in |
| // SIInstrInfo::commuteInstruction(); |
| if (!MI->getOperand(Src0Idx).isReg()) |
| return false; |
| |
| int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1); |
| if (Src1Idx == -1) |
| return false; |
| |
| MachineOperand &Src1 = MI->getOperand(Src1Idx); |
| if (Src1.isImm()) { |
| // SIInstrInfo::commuteInstruction() does support commuting the immediate |
| // operand src1 in 2 and 3 operand instructions. |
| if (!isVOP2(MI->getOpcode()) && !isVOP3(MI->getOpcode())) |
| return false; |
| } else if (Src1.isReg()) { |
| // If any source modifiers are set, the generic instruction commuting won't |
| // understand how to copy the source modifiers. |
| if (hasModifiersSet(*MI, AMDGPU::OpName::src0_modifiers) || |
| hasModifiersSet(*MI, AMDGPU::OpName::src1_modifiers)) |
| return false; |
| } else |
| return false; |
| |
| return fixCommutedOpIndices(SrcOpIdx0, SrcOpIdx1, Src0Idx, Src1Idx); |
| } |
| |
| MachineInstr *SIInstrInfo::buildMovInstr(MachineBasicBlock *MBB, |
| MachineBasicBlock::iterator I, |
| unsigned DstReg, |
| unsigned SrcReg) const { |
| return BuildMI(*MBB, I, MBB->findDebugLoc(I), get(AMDGPU::V_MOV_B32_e32), |
| DstReg) .addReg(SrcReg); |
| } |
| |
| bool SIInstrInfo::isMov(unsigned Opcode) const { |
| switch(Opcode) { |
| default: return false; |
| case AMDGPU::S_MOV_B32: |
| case AMDGPU::S_MOV_B64: |
| case AMDGPU::V_MOV_B32_e32: |
| case AMDGPU::V_MOV_B32_e64: |
| return true; |
| } |
| } |
| |
| static void removeModOperands(MachineInstr &MI) { |
| unsigned Opc = MI.getOpcode(); |
| int Src0ModIdx = AMDGPU::getNamedOperandIdx(Opc, |
| AMDGPU::OpName::src0_modifiers); |
| int Src1ModIdx = AMDGPU::getNamedOperandIdx(Opc, |
| AMDGPU::OpName::src1_modifiers); |
| int Src2ModIdx = AMDGPU::getNamedOperandIdx(Opc, |
| AMDGPU::OpName::src2_modifiers); |
| |
| MI.RemoveOperand(Src2ModIdx); |
| MI.RemoveOperand(Src1ModIdx); |
| MI.RemoveOperand(Src0ModIdx); |
| } |
| |
| bool SIInstrInfo::FoldImmediate(MachineInstr *UseMI, MachineInstr *DefMI, |
| unsigned Reg, MachineRegisterInfo *MRI) const { |
| if (!MRI->hasOneNonDBGUse(Reg)) |
| return false; |
| |
| unsigned Opc = UseMI->getOpcode(); |
| if (Opc == AMDGPU::V_MAD_F32 || Opc == AMDGPU::V_MAC_F32_e64) { |
| // Don't fold if we are using source modifiers. The new VOP2 instructions |
| // don't have them. |
| if (hasModifiersSet(*UseMI, AMDGPU::OpName::src0_modifiers) || |
| hasModifiersSet(*UseMI, AMDGPU::OpName::src1_modifiers) || |
| hasModifiersSet(*UseMI, AMDGPU::OpName::src2_modifiers)) { |
| return false; |
| } |
| |
| MachineOperand *Src0 = getNamedOperand(*UseMI, AMDGPU::OpName::src0); |
| MachineOperand *Src1 = getNamedOperand(*UseMI, AMDGPU::OpName::src1); |
| MachineOperand *Src2 = getNamedOperand(*UseMI, AMDGPU::OpName::src2); |
| |
| // Multiplied part is the constant: Use v_madmk_f32 |
| // We should only expect these to be on src0 due to canonicalizations. |
| if (Src0->isReg() && Src0->getReg() == Reg) { |
| if (!Src1->isReg() || |
| (Src1->isReg() && RI.isSGPRClass(MRI->getRegClass(Src1->getReg())))) |
| return false; |
| |
| if (!Src2->isReg() || |
| (Src2->isReg() && RI.isSGPRClass(MRI->getRegClass(Src2->getReg())))) |
| return false; |
| |
| // We need to do some weird looking operand shuffling since the madmk |
| // operands are out of the normal expected order with the multiplied |
| // constant as the last operand. |
| // |
| // v_mad_f32 src0, src1, src2 -> v_madmk_f32 src0 * src2K + src1 |
| // src0 -> src2 K |
| // src1 -> src0 |
| // src2 -> src1 |
| |
| const int64_t Imm = DefMI->getOperand(1).getImm(); |
| |
| // FIXME: This would be a lot easier if we could return a new instruction |
| // instead of having to modify in place. |
| |
| // Remove these first since they are at the end. |
| UseMI->RemoveOperand(AMDGPU::getNamedOperandIdx(Opc, |
| AMDGPU::OpName::omod)); |
| UseMI->RemoveOperand(AMDGPU::getNamedOperandIdx(Opc, |
| AMDGPU::OpName::clamp)); |
| |
| unsigned Src1Reg = Src1->getReg(); |
| unsigned Src1SubReg = Src1->getSubReg(); |
| unsigned Src2Reg = Src2->getReg(); |
| unsigned Src2SubReg = Src2->getSubReg(); |
| Src0->setReg(Src1Reg); |
| Src0->setSubReg(Src1SubReg); |
| Src0->setIsKill(Src1->isKill()); |
| |
| Src1->setReg(Src2Reg); |
| Src1->setSubReg(Src2SubReg); |
| Src1->setIsKill(Src2->isKill()); |
| |
| if (Opc == AMDGPU::V_MAC_F32_e64) { |
| UseMI->untieRegOperand( |
| AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2)); |
| } |
| |
| Src2->ChangeToImmediate(Imm); |
| |
| removeModOperands(*UseMI); |
| UseMI->setDesc(get(AMDGPU::V_MADMK_F32)); |
| |
| bool DeleteDef = MRI->hasOneNonDBGUse(Reg); |
| if (DeleteDef) |
| DefMI->eraseFromParent(); |
| |
| return true; |
| } |
| |
| // Added part is the constant: Use v_madak_f32 |
| if (Src2->isReg() && Src2->getReg() == Reg) { |
| // Not allowed to use constant bus for another operand. |
| // We can however allow an inline immediate as src0. |
| if (!Src0->isImm() && |
| (Src0->isReg() && RI.isSGPRClass(MRI->getRegClass(Src0->getReg())))) |
| return false; |
| |
| if (!Src1->isReg() || |
| (Src1->isReg() && RI.isSGPRClass(MRI->getRegClass(Src1->getReg())))) |
| return false; |
| |
| const int64_t Imm = DefMI->getOperand(1).getImm(); |
| |
| // FIXME: This would be a lot easier if we could return a new instruction |
| // instead of having to modify in place. |
| |
| // Remove these first since they are at the end. |
| UseMI->RemoveOperand(AMDGPU::getNamedOperandIdx(Opc, |
| AMDGPU::OpName::omod)); |
| UseMI->RemoveOperand(AMDGPU::getNamedOperandIdx(Opc, |
| AMDGPU::OpName::clamp)); |
| |
| if (Opc == AMDGPU::V_MAC_F32_e64) { |
| UseMI->untieRegOperand( |
| AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2)); |
| } |
| |
| // ChangingToImmediate adds Src2 back to the instruction. |
| Src2->ChangeToImmediate(Imm); |
| |
| // These come before src2. |
| removeModOperands(*UseMI); |
| UseMI->setDesc(get(AMDGPU::V_MADAK_F32)); |
| |
| bool DeleteDef = MRI->hasOneNonDBGUse(Reg); |
| if (DeleteDef) |
| DefMI->eraseFromParent(); |
| |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static bool offsetsDoNotOverlap(int WidthA, int OffsetA, |
| int WidthB, int OffsetB) { |
| int LowOffset = OffsetA < OffsetB ? OffsetA : OffsetB; |
| int HighOffset = OffsetA < OffsetB ? OffsetB : OffsetA; |
| int LowWidth = (LowOffset == OffsetA) ? WidthA : WidthB; |
| return LowOffset + LowWidth <= HighOffset; |
| } |
| |
| bool SIInstrInfo::checkInstOffsetsDoNotOverlap(MachineInstr *MIa, |
| MachineInstr *MIb) const { |
| unsigned BaseReg0, Offset0; |
| unsigned BaseReg1, Offset1; |
| |
| if (getMemOpBaseRegImmOfs(MIa, BaseReg0, Offset0, &RI) && |
| getMemOpBaseRegImmOfs(MIb, BaseReg1, Offset1, &RI)) { |
| assert(MIa->hasOneMemOperand() && MIb->hasOneMemOperand() && |
| "read2 / write2 not expected here yet"); |
| unsigned Width0 = (*MIa->memoperands_begin())->getSize(); |
| unsigned Width1 = (*MIb->memoperands_begin())->getSize(); |
| if (BaseReg0 == BaseReg1 && |
| offsetsDoNotOverlap(Width0, Offset0, Width1, Offset1)) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| bool SIInstrInfo::areMemAccessesTriviallyDisjoint(MachineInstr *MIa, |
| MachineInstr *MIb, |
| AliasAnalysis *AA) const { |
| assert(MIa && (MIa->mayLoad() || MIa->mayStore()) && |
| "MIa must load from or modify a memory location"); |
| assert(MIb && (MIb->mayLoad() || MIb->mayStore()) && |
| "MIb must load from or modify a memory location"); |
| |
| if (MIa->hasUnmodeledSideEffects() || MIb->hasUnmodeledSideEffects()) |
| return false; |
| |
| // XXX - Can we relax this between address spaces? |
| if (MIa->hasOrderedMemoryRef() || MIb->hasOrderedMemoryRef()) |
| return false; |
| |
| // TODO: Should we check the address space from the MachineMemOperand? That |
| // would allow us to distinguish objects we know don't alias based on the |
| // underlying address space, even if it was lowered to a different one, |
| // e.g. private accesses lowered to use MUBUF instructions on a scratch |
| // buffer. |
| if (isDS(*MIa)) { |
| if (isDS(*MIb)) |
| return checkInstOffsetsDoNotOverlap(MIa, MIb); |
| |
| return !isFLAT(*MIb); |
| } |
| |
| if (isMUBUF(*MIa) || isMTBUF(*MIa)) { |
| if (isMUBUF(*MIb) || isMTBUF(*MIb)) |
| return checkInstOffsetsDoNotOverlap(MIa, MIb); |
| |
| return !isFLAT(*MIb) && !isSMRD(*MIb); |
| } |
| |
| if (isSMRD(*MIa)) { |
| if (isSMRD(*MIb)) |
| return checkInstOffsetsDoNotOverlap(MIa, MIb); |
| |
| return !isFLAT(*MIb) && !isMUBUF(*MIa) && !isMTBUF(*MIa); |
| } |
| |
| if (isFLAT(*MIa)) { |
| if (isFLAT(*MIb)) |
| return checkInstOffsetsDoNotOverlap(MIa, MIb); |
| |
| return false; |
| } |
| |
| return false; |
| } |
| |
| MachineInstr *SIInstrInfo::convertToThreeAddress(MachineFunction::iterator &MBB, |
| MachineBasicBlock::iterator &MI, |
| LiveVariables *LV) const { |
| |
| switch (MI->getOpcode()) { |
| default: return nullptr; |
| case AMDGPU::V_MAC_F32_e64: break; |
| case AMDGPU::V_MAC_F32_e32: { |
| const MachineOperand *Src0 = getNamedOperand(*MI, AMDGPU::OpName::src0); |
| if (Src0->isImm() && !isInlineConstant(*Src0, 4)) |
| return nullptr; |
| break; |
| } |
| } |
| |
| const MachineOperand *Dst = getNamedOperand(*MI, AMDGPU::OpName::dst); |
| const MachineOperand *Src0 = getNamedOperand(*MI, AMDGPU::OpName::src0); |
| const MachineOperand *Src1 = getNamedOperand(*MI, AMDGPU::OpName::src1); |
| const MachineOperand *Src2 = getNamedOperand(*MI, AMDGPU::OpName::src2); |
| |
| return BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::V_MAD_F32)) |
| .addOperand(*Dst) |
| .addImm(0) // Src0 mods |
| .addOperand(*Src0) |
| .addImm(0) // Src1 mods |
| .addOperand(*Src1) |
| .addImm(0) // Src mods |
| .addOperand(*Src2) |
| .addImm(0) // clamp |
| .addImm(0); // omod |
| } |
| |
| bool SIInstrInfo::isInlineConstant(const APInt &Imm) const { |
| int64_t SVal = Imm.getSExtValue(); |
| if (SVal >= -16 && SVal <= 64) |
| return true; |
| |
| if (Imm.getBitWidth() == 64) { |
| uint64_t Val = Imm.getZExtValue(); |
| return (DoubleToBits(0.0) == Val) || |
| (DoubleToBits(1.0) == Val) || |
| (DoubleToBits(-1.0) == Val) || |
| (DoubleToBits(0.5) == Val) || |
| (DoubleToBits(-0.5) == Val) || |
| (DoubleToBits(2.0) == Val) || |
| (DoubleToBits(-2.0) == Val) || |
| (DoubleToBits(4.0) == Val) || |
| (DoubleToBits(-4.0) == Val); |
| } |
| |
| // The actual type of the operand does not seem to matter as long |
| // as the bits match one of the inline immediate values. For example: |
| // |
| // -nan has the hexadecimal encoding of 0xfffffffe which is -2 in decimal, |
| // so it is a legal inline immediate. |
| // |
| // 1065353216 has the hexadecimal encoding 0x3f800000 which is 1.0f in |
| // floating-point, so it is a legal inline immediate. |
| uint32_t Val = Imm.getZExtValue(); |
| |
| return (FloatToBits(0.0f) == Val) || |
| (FloatToBits(1.0f) == Val) || |
| (FloatToBits(-1.0f) == Val) || |
| (FloatToBits(0.5f) == Val) || |
| (FloatToBits(-0.5f) == Val) || |
| (FloatToBits(2.0f) == Val) || |
| (FloatToBits(-2.0f) == Val) || |
| (FloatToBits(4.0f) == Val) || |
| (FloatToBits(-4.0f) == Val); |
| } |
| |
| bool SIInstrInfo::isInlineConstant(const MachineOperand &MO, |
| unsigned OpSize) const { |
| if (MO.isImm()) { |
| // MachineOperand provides no way to tell the true operand size, since it |
| // only records a 64-bit value. We need to know the size to determine if a |
| // 32-bit floating point immediate bit pattern is legal for an integer |
| // immediate. It would be for any 32-bit integer operand, but would not be |
| // for a 64-bit one. |
| |
| unsigned BitSize = 8 * OpSize; |
| return isInlineConstant(APInt(BitSize, MO.getImm(), true)); |
| } |
| |
| return false; |
| } |
| |
| bool SIInstrInfo::isLiteralConstant(const MachineOperand &MO, |
| unsigned OpSize) const { |
| return MO.isImm() && !isInlineConstant(MO, OpSize); |
| } |
| |
| static bool compareMachineOp(const MachineOperand &Op0, |
| const MachineOperand &Op1) { |
| if (Op0.getType() != Op1.getType()) |
| return false; |
| |
| switch (Op0.getType()) { |
| case MachineOperand::MO_Register: |
| return Op0.getReg() == Op1.getReg(); |
| case MachineOperand::MO_Immediate: |
| return Op0.getImm() == Op1.getImm(); |
| default: |
| llvm_unreachable("Didn't expect to be comparing these operand types"); |
| } |
| } |
| |
| bool SIInstrInfo::isImmOperandLegal(const MachineInstr *MI, unsigned OpNo, |
| const MachineOperand &MO) const { |
| const MCOperandInfo &OpInfo = get(MI->getOpcode()).OpInfo[OpNo]; |
| |
| assert(MO.isImm() || MO.isTargetIndex() || MO.isFI()); |
| |
| if (OpInfo.OperandType == MCOI::OPERAND_IMMEDIATE) |
| return true; |
| |
| if (OpInfo.RegClass < 0) |
| return false; |
| |
| unsigned OpSize = RI.getRegClass(OpInfo.RegClass)->getSize(); |
| if (isLiteralConstant(MO, OpSize)) |
| return RI.opCanUseLiteralConstant(OpInfo.OperandType); |
| |
| return RI.opCanUseInlineConstant(OpInfo.OperandType); |
| } |
| |
| bool SIInstrInfo::hasVALU32BitEncoding(unsigned Opcode) const { |
| int Op32 = AMDGPU::getVOPe32(Opcode); |
| if (Op32 == -1) |
| return false; |
| |
| return pseudoToMCOpcode(Op32) != -1; |
| } |
| |
| bool SIInstrInfo::hasModifiers(unsigned Opcode) const { |
| // The src0_modifier operand is present on all instructions |
| // that have modifiers. |
| |
| return AMDGPU::getNamedOperandIdx(Opcode, |
| AMDGPU::OpName::src0_modifiers) != -1; |
| } |
| |
| bool SIInstrInfo::hasModifiersSet(const MachineInstr &MI, |
| unsigned OpName) const { |
| const MachineOperand *Mods = getNamedOperand(MI, OpName); |
| return Mods && Mods->getImm(); |
| } |
| |
| bool SIInstrInfo::usesConstantBus(const MachineRegisterInfo &MRI, |
| const MachineOperand &MO, |
| unsigned OpSize) const { |
| // Literal constants use the constant bus. |
| if (isLiteralConstant(MO, OpSize)) |
| return true; |
| |
| if (!MO.isReg() || !MO.isUse()) |
| return false; |
| |
| if (TargetRegisterInfo::isVirtualRegister(MO.getReg())) |
| return RI.isSGPRClass(MRI.getRegClass(MO.getReg())); |
| |
| // FLAT_SCR is just an SGPR pair. |
| if (!MO.isImplicit() && (MO.getReg() == AMDGPU::FLAT_SCR)) |
| return true; |
| |
| // EXEC register uses the constant bus. |
| if (!MO.isImplicit() && MO.getReg() == AMDGPU::EXEC) |
| return true; |
| |
| // SGPRs use the constant bus |
| if (MO.getReg() == AMDGPU::M0 || MO.getReg() == AMDGPU::VCC || |
| (!MO.isImplicit() && |
| (AMDGPU::SGPR_32RegClass.contains(MO.getReg()) || |
| AMDGPU::SGPR_64RegClass.contains(MO.getReg())))) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static unsigned findImplicitSGPRRead(const MachineInstr &MI) { |
| for (const MachineOperand &MO : MI.implicit_operands()) { |
| // We only care about reads. |
| if (MO.isDef()) |
| continue; |
| |
| switch (MO.getReg()) { |
| case AMDGPU::VCC: |
| case AMDGPU::M0: |
| case AMDGPU::FLAT_SCR: |
| return MO.getReg(); |
| |
| default: |
| break; |
| } |
| } |
| |
| return AMDGPU::NoRegister; |
| } |
| |
| bool SIInstrInfo::verifyInstruction(const MachineInstr *MI, |
| StringRef &ErrInfo) const { |
| uint16_t Opcode = MI->getOpcode(); |
| const MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo(); |
| int Src0Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src0); |
| int Src1Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src1); |
| int Src2Idx = AMDGPU::getNamedOperandIdx(Opcode, AMDGPU::OpName::src2); |
| |
| // Make sure the number of operands is correct. |
| const MCInstrDesc &Desc = get(Opcode); |
| if (!Desc.isVariadic() && |
| Desc.getNumOperands() != MI->getNumExplicitOperands()) { |
| ErrInfo = "Instruction has wrong number of operands."; |
| return false; |
| } |
| |
| // Make sure the register classes are correct. |
| for (int i = 0, e = Desc.getNumOperands(); i != e; ++i) { |
| if (MI->getOperand(i).isFPImm()) { |
| ErrInfo = "FPImm Machine Operands are not supported. ISel should bitcast " |
| "all fp values to integers."; |
| return false; |
| } |
| |
| int RegClass = Desc.OpInfo[i].RegClass; |
| |
| switch (Desc.OpInfo[i].OperandType) { |
| case MCOI::OPERAND_REGISTER: |
| if (MI->getOperand(i).isImm()) { |
| ErrInfo = "Illegal immediate value for operand."; |
| return false; |
| } |
| break; |
| case AMDGPU::OPERAND_REG_IMM32: |
| break; |
| case AMDGPU::OPERAND_REG_INLINE_C: |
| if (isLiteralConstant(MI->getOperand(i), |
| RI.getRegClass(RegClass)->getSize())) { |
| ErrInfo = "Illegal immediate value for operand."; |
| return false; |
| } |
| break; |
| case MCOI::OPERAND_IMMEDIATE: |
| // Check if this operand is an immediate. |
| // FrameIndex operands will be replaced by immediates, so they are |
| // allowed. |
| if (!MI->getOperand(i).isImm() && !MI->getOperand(i).isFI()) { |
| ErrInfo = "Expected immediate, but got non-immediate"; |
| return false; |
| } |
| // Fall-through |
| default: |
| continue; |
| } |
| |
| if (!MI->getOperand(i).isReg()) |
| continue; |
| |
| if (RegClass != -1) { |
| unsigned Reg = MI->getOperand(i).getReg(); |
| if (TargetRegisterInfo::isVirtualRegister(Reg)) |
| continue; |
| |
| const TargetRegisterClass *RC = RI.getRegClass(RegClass); |
| if (!RC->contains(Reg)) { |
| ErrInfo = "Operand has incorrect register class."; |
| return false; |
| } |
| } |
| } |
| |
| |
| // Verify VOP* |
| if (isVOP1(*MI) || isVOP2(*MI) || isVOP3(*MI) || isVOPC(*MI)) { |
| // Only look at the true operands. Only a real operand can use the constant |
| // bus, and we don't want to check pseudo-operands like the source modifier |
| // flags. |
| const int OpIndices[] = { Src0Idx, Src1Idx, Src2Idx }; |
| |
| unsigned ConstantBusCount = 0; |
| unsigned SGPRUsed = findImplicitSGPRRead(*MI); |
| if (SGPRUsed != AMDGPU::NoRegister) |
| ++ConstantBusCount; |
| |
| for (int OpIdx : OpIndices) { |
| if (OpIdx == -1) |
| break; |
| const MachineOperand &MO = MI->getOperand(OpIdx); |
| if (usesConstantBus(MRI, MO, getOpSize(Opcode, OpIdx))) { |
| if (MO.isReg()) { |
| if (MO.getReg() != SGPRUsed) |
| ++ConstantBusCount; |
| SGPRUsed = MO.getReg(); |
| } else { |
| ++ConstantBusCount; |
| } |
| } |
| } |
| if (ConstantBusCount > 1) { |
| ErrInfo = "VOP* instruction uses the constant bus more than once"; |
| return false; |
| } |
| } |
| |
| // Verify misc. restrictions on specific instructions. |
| if (Desc.getOpcode() == AMDGPU::V_DIV_SCALE_F32 || |
| Desc.getOpcode() == AMDGPU::V_DIV_SCALE_F64) { |
| const MachineOperand &Src0 = MI->getOperand(Src0Idx); |
| const MachineOperand &Src1 = MI->getOperand(Src1Idx); |
| const MachineOperand &Src2 = MI->getOperand(Src2Idx); |
| if (Src0.isReg() && Src1.isReg() && Src2.isReg()) { |
| if (!compareMachineOp(Src0, Src1) && |
| !compareMachineOp(Src0, Src2)) { |
| ErrInfo = "v_div_scale_{f32|f64} require src0 = src1 or src2"; |
| return false; |
| } |
| } |
| } |
| |
| // Make sure we aren't losing exec uses in the td files. This mostly requires |
| // being careful when using let Uses to try to add other use registers. |
| if (!isGenericOpcode(Opcode) && !isSALU(Opcode) && !isSMRD(Opcode)) { |
| const MachineOperand *Exec = MI->findRegisterUseOperand(AMDGPU::EXEC); |
| if (!Exec || !Exec->isImplicit()) { |
| ErrInfo = "VALU instruction does not implicitly read exec mask"; |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| unsigned SIInstrInfo::getVALUOp(const MachineInstr &MI) { |
| switch (MI.getOpcode()) { |
| default: return AMDGPU::INSTRUCTION_LIST_END; |
| case AMDGPU::REG_SEQUENCE: return AMDGPU::REG_SEQUENCE; |
| case AMDGPU::COPY: return AMDGPU::COPY; |
| case AMDGPU::PHI: return AMDGPU::PHI; |
| case AMDGPU::INSERT_SUBREG: return AMDGPU::INSERT_SUBREG; |
| case AMDGPU::S_MOV_B32: |
| return MI.getOperand(1).isReg() ? |
| AMDGPU::COPY : AMDGPU::V_MOV_B32_e32; |
| case AMDGPU::S_ADD_I32: |
| case AMDGPU::S_ADD_U32: return AMDGPU::V_ADD_I32_e32; |
| case AMDGPU::S_ADDC_U32: return AMDGPU::V_ADDC_U32_e32; |
| case AMDGPU::S_SUB_I32: |
| case AMDGPU::S_SUB_U32: return AMDGPU::V_SUB_I32_e32; |
| case AMDGPU::S_SUBB_U32: return AMDGPU::V_SUBB_U32_e32; |
| case AMDGPU::S_MUL_I32: return AMDGPU::V_MUL_LO_I32; |
| case AMDGPU::S_AND_B32: return AMDGPU::V_AND_B32_e32; |
| case AMDGPU::S_OR_B32: return AMDGPU::V_OR_B32_e32; |
| case AMDGPU::S_XOR_B32: return AMDGPU::V_XOR_B32_e32; |
| case AMDGPU::S_MIN_I32: return AMDGPU::V_MIN_I32_e32; |
| case AMDGPU::S_MIN_U32: return AMDGPU::V_MIN_U32_e32; |
| case AMDGPU::S_MAX_I32: return AMDGPU::V_MAX_I32_e32; |
| case AMDGPU::S_MAX_U32: return AMDGPU::V_MAX_U32_e32; |
| case AMDGPU::S_ASHR_I32: return AMDGPU::V_ASHR_I32_e32; |
| case AMDGPU::S_ASHR_I64: return AMDGPU::V_ASHR_I64; |
| case AMDGPU::S_LSHL_B32: return AMDGPU::V_LSHL_B32_e32; |
| case AMDGPU::S_LSHL_B64: return AMDGPU::V_LSHL_B64; |
| case AMDGPU::S_LSHR_B32: return AMDGPU::V_LSHR_B32_e32; |
| case AMDGPU::S_LSHR_B64: return AMDGPU::V_LSHR_B64; |
| case AMDGPU::S_SEXT_I32_I8: return AMDGPU::V_BFE_I32; |
| case AMDGPU::S_SEXT_I32_I16: return AMDGPU::V_BFE_I32; |
| case AMDGPU::S_BFE_U32: return AMDGPU::V_BFE_U32; |
| case AMDGPU::S_BFE_I32: return AMDGPU::V_BFE_I32; |
| case AMDGPU::S_BFM_B32: return AMDGPU::V_BFM_B32_e64; |
| case AMDGPU::S_BREV_B32: return AMDGPU::V_BFREV_B32_e32; |
| case AMDGPU::S_NOT_B32: return AMDGPU::V_NOT_B32_e32; |
| case AMDGPU::S_NOT_B64: return AMDGPU::V_NOT_B32_e32; |
| case AMDGPU::S_CMP_EQ_I32: return AMDGPU::V_CMP_EQ_I32_e32; |
| case AMDGPU::S_CMP_LG_I32: return AMDGPU::V_CMP_NE_I32_e32; |
| case AMDGPU::S_CMP_GT_I32: return AMDGPU::V_CMP_GT_I32_e32; |
| case AMDGPU::S_CMP_GE_I32: return AMDGPU::V_CMP_GE_I32_e32; |
| case AMDGPU::S_CMP_LT_I32: return AMDGPU::V_CMP_LT_I32_e32; |
| case AMDGPU::S_CMP_LE_I32: return AMDGPU::V_CMP_LE_I32_e32; |
| case AMDGPU::S_LOAD_DWORD_IMM: |
| case AMDGPU::S_LOAD_DWORD_SGPR: |
| case AMDGPU::S_LOAD_DWORD_IMM_ci: |
| return AMDGPU::BUFFER_LOAD_DWORD_ADDR64; |
| case AMDGPU::S_LOAD_DWORDX2_IMM: |
| case AMDGPU::S_LOAD_DWORDX2_SGPR: |
| case AMDGPU::S_LOAD_DWORDX2_IMM_ci: |
| return AMDGPU::BUFFER_LOAD_DWORDX2_ADDR64; |
| case AMDGPU::S_LOAD_DWORDX4_IMM: |
| case AMDGPU::S_LOAD_DWORDX4_SGPR: |
| case AMDGPU::S_LOAD_DWORDX4_IMM_ci: |
| return AMDGPU::BUFFER_LOAD_DWORDX4_ADDR64; |
| case AMDGPU::S_BCNT1_I32_B32: return AMDGPU::V_BCNT_U32_B32_e64; |
| case AMDGPU::S_FF1_I32_B32: return AMDGPU::V_FFBL_B32_e32; |
| case AMDGPU::S_FLBIT_I32_B32: return AMDGPU::V_FFBH_U32_e32; |
| case AMDGPU::S_FLBIT_I32: return AMDGPU::V_FFBH_I32_e64; |
| } |
| } |
| |
| bool SIInstrInfo::isSALUOpSupportedOnVALU(const MachineInstr &MI) const { |
| return getVALUOp(MI) != AMDGPU::INSTRUCTION_LIST_END; |
| } |
| |
| const TargetRegisterClass *SIInstrInfo::getOpRegClass(const MachineInstr &MI, |
| unsigned OpNo) const { |
| const MachineRegisterInfo &MRI = MI.getParent()->getParent()->getRegInfo(); |
| const MCInstrDesc &Desc = get(MI.getOpcode()); |
| if (MI.isVariadic() || OpNo >= Desc.getNumOperands() || |
| Desc.OpInfo[OpNo].RegClass == -1) { |
| unsigned Reg = MI.getOperand(OpNo).getReg(); |
| |
| if (TargetRegisterInfo::isVirtualRegister(Reg)) |
| return MRI.getRegClass(Reg); |
| return RI.getPhysRegClass(Reg); |
| } |
| |
| unsigned RCID = Desc.OpInfo[OpNo].RegClass; |
| return RI.getRegClass(RCID); |
| } |
| |
| bool SIInstrInfo::canReadVGPR(const MachineInstr &MI, unsigned OpNo) const { |
| switch (MI.getOpcode()) { |
| case AMDGPU::COPY: |
| case AMDGPU::REG_SEQUENCE: |
| case AMDGPU::PHI: |
| case AMDGPU::INSERT_SUBREG: |
| return RI.hasVGPRs(getOpRegClass(MI, 0)); |
| default: |
| return RI.hasVGPRs(getOpRegClass(MI, OpNo)); |
| } |
| } |
| |
| void SIInstrInfo::legalizeOpWithMove(MachineInstr *MI, unsigned OpIdx) const { |
| MachineBasicBlock::iterator I = MI; |
| MachineBasicBlock *MBB = MI->getParent(); |
| MachineOperand &MO = MI->getOperand(OpIdx); |
| MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo(); |
| unsigned RCID = get(MI->getOpcode()).OpInfo[OpIdx].RegClass; |
| const TargetRegisterClass *RC = RI.getRegClass(RCID); |
| unsigned Opcode = AMDGPU::V_MOV_B32_e32; |
| if (MO.isReg()) |
| Opcode = AMDGPU::COPY; |
| else if (RI.isSGPRClass(RC)) |
| Opcode = AMDGPU::S_MOV_B32; |
| |
| |
| const TargetRegisterClass *VRC = RI.getEquivalentVGPRClass(RC); |
| if (RI.getCommonSubClass(&AMDGPU::VReg_64RegClass, VRC)) |
| VRC = &AMDGPU::VReg_64RegClass; |
| else |
| VRC = &AMDGPU::VGPR_32RegClass; |
| |
| unsigned Reg = MRI.createVirtualRegister(VRC); |
| DebugLoc DL = MBB->findDebugLoc(I); |
| BuildMI(*MI->getParent(), I, DL, get(Opcode), Reg) |
| .addOperand(MO); |
| MO.ChangeToRegister(Reg, false); |
| } |
| |
| unsigned SIInstrInfo::buildExtractSubReg(MachineBasicBlock::iterator MI, |
| MachineRegisterInfo &MRI, |
| MachineOperand &SuperReg, |
| const TargetRegisterClass *SuperRC, |
| unsigned SubIdx, |
| const TargetRegisterClass *SubRC) |
| const { |
| MachineBasicBlock *MBB = MI->getParent(); |
| DebugLoc DL = MI->getDebugLoc(); |
| unsigned SubReg = MRI.createVirtualRegister(SubRC); |
| |
| if (SuperReg.getSubReg() == AMDGPU::NoSubRegister) { |
| BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), SubReg) |
| .addReg(SuperReg.getReg(), 0, SubIdx); |
| return SubReg; |
| } |
| |
| // Just in case the super register is itself a sub-register, copy it to a new |
| // value so we don't need to worry about merging its subreg index with the |
| // SubIdx passed to this function. The register coalescer should be able to |
| // eliminate this extra copy. |
| unsigned NewSuperReg = MRI.createVirtualRegister(SuperRC); |
| |
| BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), NewSuperReg) |
| .addReg(SuperReg.getReg(), 0, SuperReg.getSubReg()); |
| |
| BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), SubReg) |
| .addReg(NewSuperReg, 0, SubIdx); |
| |
| return SubReg; |
| } |
| |
| MachineOperand SIInstrInfo::buildExtractSubRegOrImm( |
| MachineBasicBlock::iterator MII, |
| MachineRegisterInfo &MRI, |
| MachineOperand &Op, |
| const TargetRegisterClass *SuperRC, |
| unsigned SubIdx, |
| const TargetRegisterClass *SubRC) const { |
| if (Op.isImm()) { |
| // XXX - Is there a better way to do this? |
| if (SubIdx == AMDGPU::sub0) |
| return MachineOperand::CreateImm(Op.getImm() & 0xFFFFFFFF); |
| if (SubIdx == AMDGPU::sub1) |
| return MachineOperand::CreateImm(Op.getImm() >> 32); |
| |
| llvm_unreachable("Unhandled register index for immediate"); |
| } |
| |
| unsigned SubReg = buildExtractSubReg(MII, MRI, Op, SuperRC, |
| SubIdx, SubRC); |
| return MachineOperand::CreateReg(SubReg, false); |
| } |
| |
| // Change the order of operands from (0, 1, 2) to (0, 2, 1) |
| void SIInstrInfo::swapOperands(MachineBasicBlock::iterator Inst) const { |
| assert(Inst->getNumExplicitOperands() == 3); |
| MachineOperand Op1 = Inst->getOperand(1); |
| Inst->RemoveOperand(1); |
| Inst->addOperand(Op1); |
| } |
| |
| bool SIInstrInfo::isLegalRegOperand(const MachineRegisterInfo &MRI, |
| const MCOperandInfo &OpInfo, |
| const MachineOperand &MO) const { |
| if (!MO.isReg()) |
| return false; |
| |
| unsigned Reg = MO.getReg(); |
| const TargetRegisterClass *RC = |
| TargetRegisterInfo::isVirtualRegister(Reg) ? |
| MRI.getRegClass(Reg) : |
| RI.getPhysRegClass(Reg); |
| |
| // In order to be legal, the common sub-class must be equal to the |
| // class of the current operand. For example: |
| // |
| // v_mov_b32 s0 ; Operand defined as vsrc_32 |
| // ; RI.getCommonSubClass(s0,vsrc_32) = sgpr ; LEGAL |
| // |
| // s_sendmsg 0, s0 ; Operand defined as m0reg |
| // ; RI.getCommonSubClass(s0,m0reg) = m0reg ; NOT LEGAL |
| |
| return RI.getCommonSubClass(RC, RI.getRegClass(OpInfo.RegClass)) == RC; |
| } |
| |
| bool SIInstrInfo::isLegalVSrcOperand(const MachineRegisterInfo &MRI, |
| const MCOperandInfo &OpInfo, |
| const MachineOperand &MO) const { |
| if (MO.isReg()) |
| return isLegalRegOperand(MRI, OpInfo, MO); |
| |
| // Handle non-register types that are treated like immediates. |
| assert(MO.isImm() || MO.isTargetIndex() || MO.isFI()); |
| return true; |
| } |
| |
| bool SIInstrInfo::isOperandLegal(const MachineInstr *MI, unsigned OpIdx, |
| const MachineOperand *MO) const { |
| const MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo(); |
| const MCInstrDesc &InstDesc = get(MI->getOpcode()); |
| const MCOperandInfo &OpInfo = InstDesc.OpInfo[OpIdx]; |
| const TargetRegisterClass *DefinedRC = |
| OpInfo.RegClass != -1 ? RI.getRegClass(OpInfo.RegClass) : nullptr; |
| if (!MO) |
| MO = &MI->getOperand(OpIdx); |
| |
| if (isVALU(*MI) && |
| usesConstantBus(MRI, *MO, DefinedRC->getSize())) { |
| unsigned SGPRUsed = |
| MO->isReg() ? MO->getReg() : (unsigned)AMDGPU::NoRegister; |
| for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { |
| if (i == OpIdx) |
| continue; |
| const MachineOperand &Op = MI->getOperand(i); |
| if (Op.isReg() && Op.getReg() != SGPRUsed && |
| usesConstantBus(MRI, Op, getOpSize(*MI, i))) { |
| return false; |
| } |
| } |
| } |
| |
| if (MO->isReg()) { |
| assert(DefinedRC); |
| return isLegalRegOperand(MRI, OpInfo, *MO); |
| } |
| |
| |
| // Handle non-register types that are treated like immediates. |
| assert(MO->isImm() || MO->isTargetIndex() || MO->isFI()); |
| |
| if (!DefinedRC) { |
| // This operand expects an immediate. |
| return true; |
| } |
| |
| return isImmOperandLegal(MI, OpIdx, *MO); |
| } |
| |
| void SIInstrInfo::legalizeOperandsVOP2(MachineRegisterInfo &MRI, |
| MachineInstr *MI) const { |
| unsigned Opc = MI->getOpcode(); |
| const MCInstrDesc &InstrDesc = get(Opc); |
| |
| int Src1Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1); |
| MachineOperand &Src1 = MI->getOperand(Src1Idx); |
| |
| // If there is an implicit SGPR use such as VCC use for v_addc_u32/v_subb_u32 |
| // we need to only have one constant bus use. |
| // |
| // Note we do not need to worry about literal constants here. They are |
| // disabled for the operand type for instructions because they will always |
| // violate the one constant bus use rule. |
| bool HasImplicitSGPR = findImplicitSGPRRead(*MI) != AMDGPU::NoRegister; |
| if (HasImplicitSGPR) { |
| int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0); |
| MachineOperand &Src0 = MI->getOperand(Src0Idx); |
| |
| if (Src0.isReg() && RI.isSGPRReg(MRI, Src0.getReg())) |
| legalizeOpWithMove(MI, Src0Idx); |
| } |
| |
| // VOP2 src0 instructions support all operand types, so we don't need to check |
| // their legality. If src1 is already legal, we don't need to do anything. |
| if (isLegalRegOperand(MRI, InstrDesc.OpInfo[Src1Idx], Src1)) |
| return; |
| |
| // We do not use commuteInstruction here because it is too aggressive and will |
| // commute if it is possible. We only want to commute here if it improves |
| // legality. This can be called a fairly large number of times so don't waste |
| // compile time pointlessly swapping and checking legality again. |
| if (HasImplicitSGPR || !MI->isCommutable()) { |
| legalizeOpWithMove(MI, Src1Idx); |
| return; |
| } |
| |
| int Src0Idx = AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0); |
| MachineOperand &Src0 = MI->getOperand(Src0Idx); |
| |
| // If src0 can be used as src1, commuting will make the operands legal. |
| // Otherwise we have to give up and insert a move. |
| // |
| // TODO: Other immediate-like operand kinds could be commuted if there was a |
| // MachineOperand::ChangeTo* for them. |
| if ((!Src1.isImm() && !Src1.isReg()) || |
| !isLegalRegOperand(MRI, InstrDesc.OpInfo[Src1Idx], Src0)) { |
| legalizeOpWithMove(MI, Src1Idx); |
| return; |
| } |
| |
| int CommutedOpc = commuteOpcode(*MI); |
| if (CommutedOpc == -1) { |
| legalizeOpWithMove(MI, Src1Idx); |
| return; |
| } |
| |
| MI->setDesc(get(CommutedOpc)); |
| |
| unsigned Src0Reg = Src0.getReg(); |
| unsigned Src0SubReg = Src0.getSubReg(); |
| bool Src0Kill = Src0.isKill(); |
| |
| if (Src1.isImm()) |
| Src0.ChangeToImmediate(Src1.getImm()); |
| else if (Src1.isReg()) { |
| Src0.ChangeToRegister(Src1.getReg(), false, false, Src1.isKill()); |
| Src0.setSubReg(Src1.getSubReg()); |
| } else |
| llvm_unreachable("Should only have register or immediate operands"); |
| |
| Src1.ChangeToRegister(Src0Reg, false, false, Src0Kill); |
| Src1.setSubReg(Src0SubReg); |
| } |
| |
| // Legalize VOP3 operands. Because all operand types are supported for any |
| // operand, and since literal constants are not allowed and should never be |
| // seen, we only need to worry about inserting copies if we use multiple SGPR |
| // operands. |
| void SIInstrInfo::legalizeOperandsVOP3( |
| MachineRegisterInfo &MRI, |
| MachineInstr *MI) const { |
| unsigned Opc = MI->getOpcode(); |
| |
| int VOP3Idx[3] = { |
| AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src0), |
| AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src1), |
| AMDGPU::getNamedOperandIdx(Opc, AMDGPU::OpName::src2) |
| }; |
| |
| // Find the one SGPR operand we are allowed to use. |
| unsigned SGPRReg = findUsedSGPR(MI, VOP3Idx); |
| |
| for (unsigned i = 0; i < 3; ++i) { |
| int Idx = VOP3Idx[i]; |
| if (Idx == -1) |
| break; |
| MachineOperand &MO = MI->getOperand(Idx); |
| |
| // We should never see a VOP3 instruction with an illegal immediate operand. |
| if (!MO.isReg()) |
| continue; |
| |
| if (!RI.isSGPRClass(MRI.getRegClass(MO.getReg()))) |
| continue; // VGPRs are legal |
| |
| if (SGPRReg == AMDGPU::NoRegister || SGPRReg == MO.getReg()) { |
| SGPRReg = MO.getReg(); |
| // We can use one SGPR in each VOP3 instruction. |
| continue; |
| } |
| |
| // If we make it this far, then the operand is not legal and we must |
| // legalize it. |
| legalizeOpWithMove(MI, Idx); |
| } |
| } |
| |
| void SIInstrInfo::legalizeOperands(MachineInstr *MI) const { |
| MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo(); |
| |
| // Legalize VOP2 |
| if (isVOP2(*MI)) { |
| legalizeOperandsVOP2(MRI, MI); |
| return; |
| } |
| |
| // Legalize VOP3 |
| if (isVOP3(*MI)) { |
| legalizeOperandsVOP3(MRI, MI); |
| return; |
| } |
| |
| // Legalize REG_SEQUENCE and PHI |
| // The register class of the operands much be the same type as the register |
| // class of the output. |
| if (MI->getOpcode() == AMDGPU::PHI) { |
| const TargetRegisterClass *RC = nullptr, *SRC = nullptr, *VRC = nullptr; |
| for (unsigned i = 1, e = MI->getNumOperands(); i != e; i+=2) { |
| if (!MI->getOperand(i).isReg() || |
| !TargetRegisterInfo::isVirtualRegister(MI->getOperand(i).getReg())) |
| continue; |
| const TargetRegisterClass *OpRC = |
| MRI.getRegClass(MI->getOperand(i).getReg()); |
| if (RI.hasVGPRs(OpRC)) { |
| VRC = OpRC; |
| } else { |
| SRC = OpRC; |
| } |
| } |
| |
| // If any of the operands are VGPR registers, then they all most be |
| // otherwise we will create illegal VGPR->SGPR copies when legalizing |
| // them. |
| if (VRC || !RI.isSGPRClass(getOpRegClass(*MI, 0))) { |
| if (!VRC) { |
| assert(SRC); |
| VRC = RI.getEquivalentVGPRClass(SRC); |
| } |
| RC = VRC; |
| } else { |
| RC = SRC; |
| } |
| |
| // Update all the operands so they have the same type. |
| for (unsigned I = 1, E = MI->getNumOperands(); I != E; I += 2) { |
| MachineOperand &Op = MI->getOperand(I); |
| if (!Op.isReg() || !TargetRegisterInfo::isVirtualRegister(Op.getReg())) |
| continue; |
| unsigned DstReg = MRI.createVirtualRegister(RC); |
| |
| // MI is a PHI instruction. |
| MachineBasicBlock *InsertBB = MI->getOperand(I + 1).getMBB(); |
| MachineBasicBlock::iterator Insert = InsertBB->getFirstTerminator(); |
| |
| BuildMI(*InsertBB, Insert, MI->getDebugLoc(), get(AMDGPU::COPY), DstReg) |
| .addOperand(Op); |
| Op.setReg(DstReg); |
| } |
| } |
| |
| // REG_SEQUENCE doesn't really require operand legalization, but if one has a |
| // VGPR dest type and SGPR sources, insert copies so all operands are |
| // VGPRs. This seems to help operand folding / the register coalescer. |
| if (MI->getOpcode() == AMDGPU::REG_SEQUENCE) { |
| MachineBasicBlock *MBB = MI->getParent(); |
| const TargetRegisterClass *DstRC = getOpRegClass(*MI, 0); |
| if (RI.hasVGPRs(DstRC)) { |
| // Update all the operands so they are VGPR register classes. These may |
| // not be the same register class because REG_SEQUENCE supports mixing |
| // subregister index types e.g. sub0_sub1 + sub2 + sub3 |
| for (unsigned I = 1, E = MI->getNumOperands(); I != E; I += 2) { |
| MachineOperand &Op = MI->getOperand(I); |
| if (!Op.isReg() || !TargetRegisterInfo::isVirtualRegister(Op.getReg())) |
| continue; |
| |
| const TargetRegisterClass *OpRC = MRI.getRegClass(Op.getReg()); |
| const TargetRegisterClass *VRC = RI.getEquivalentVGPRClass(OpRC); |
| if (VRC == OpRC) |
| continue; |
| |
| unsigned DstReg = MRI.createVirtualRegister(VRC); |
| |
| BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::COPY), DstReg) |
| .addOperand(Op); |
| |
| Op.setReg(DstReg); |
| Op.setIsKill(); |
| } |
| } |
| |
| return; |
| } |
| |
| // Legalize INSERT_SUBREG |
| // src0 must have the same register class as dst |
| if (MI->getOpcode() == AMDGPU::INSERT_SUBREG) { |
| unsigned Dst = MI->getOperand(0).getReg(); |
| unsigned Src0 = MI->getOperand(1).getReg(); |
| const TargetRegisterClass *DstRC = MRI.getRegClass(Dst); |
| const TargetRegisterClass *Src0RC = MRI.getRegClass(Src0); |
| if (DstRC != Src0RC) { |
| MachineBasicBlock &MBB = *MI->getParent(); |
| unsigned NewSrc0 = MRI.createVirtualRegister(DstRC); |
| BuildMI(MBB, MI, MI->getDebugLoc(), get(AMDGPU::COPY), NewSrc0) |
| .addReg(Src0); |
| MI->getOperand(1).setReg(NewSrc0); |
| } |
| return; |
| } |
| |
| // Legalize MUBUF* instructions |
| // FIXME: If we start using the non-addr64 instructions for compute, we |
| // may need to legalize them here. |
| int SRsrcIdx = |
| AMDGPU::getNamedOperandIdx(MI->getOpcode(), AMDGPU::OpName::srsrc); |
| if (SRsrcIdx != -1) { |
| // We have an MUBUF instruction |
| MachineOperand *SRsrc = &MI->getOperand(SRsrcIdx); |
| unsigned SRsrcRC = get(MI->getOpcode()).OpInfo[SRsrcIdx].RegClass; |
| if (RI.getCommonSubClass(MRI.getRegClass(SRsrc->getReg()), |
| RI.getRegClass(SRsrcRC))) { |
| // The operands are legal. |
| // FIXME: We may need to legalize operands besided srsrc. |
| return; |
| } |
| |
| MachineBasicBlock &MBB = *MI->getParent(); |
| |
| // Extract the ptr from the resource descriptor. |
| unsigned SRsrcPtr = buildExtractSubReg(MI, MRI, *SRsrc, |
| &AMDGPU::VReg_128RegClass, AMDGPU::sub0_sub1, &AMDGPU::VReg_64RegClass); |
| |
| // Create an empty resource descriptor |
| unsigned Zero64 = MRI.createVirtualRegister(&AMDGPU::SReg_64RegClass); |
| unsigned SRsrcFormatLo = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass); |
| unsigned SRsrcFormatHi = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass); |
| unsigned NewSRsrc = MRI.createVirtualRegister(&AMDGPU::SReg_128RegClass); |
| uint64_t RsrcDataFormat = getDefaultRsrcDataFormat(); |
| |
| // Zero64 = 0 |
| BuildMI(MBB, MI, MI->getDebugLoc(), get(AMDGPU::S_MOV_B64), |
| Zero64) |
| .addImm(0); |
| |
| // SRsrcFormatLo = RSRC_DATA_FORMAT{31-0} |
| BuildMI(MBB, MI, MI->getDebugLoc(), get(AMDGPU::S_MOV_B32), |
| SRsrcFormatLo) |
| .addImm(RsrcDataFormat & 0xFFFFFFFF); |
| |
| // SRsrcFormatHi = RSRC_DATA_FORMAT{63-32} |
| BuildMI(MBB, MI, MI->getDebugLoc(), get(AMDGPU::S_MOV_B32), |
| SRsrcFormatHi) |
| .addImm(RsrcDataFormat >> 32); |
| |
| // NewSRsrc = {Zero64, SRsrcFormat} |
| BuildMI(MBB, MI, MI->getDebugLoc(), get(AMDGPU::REG_SEQUENCE), NewSRsrc) |
| .addReg(Zero64) |
| .addImm(AMDGPU::sub0_sub1) |
| .addReg(SRsrcFormatLo) |
| .addImm(AMDGPU::sub2) |
| .addReg(SRsrcFormatHi) |
| .addImm(AMDGPU::sub3); |
| |
| MachineOperand *VAddr = getNamedOperand(*MI, AMDGPU::OpName::vaddr); |
| unsigned NewVAddr = MRI.createVirtualRegister(&AMDGPU::VReg_64RegClass); |
| if (VAddr) { |
| // This is already an ADDR64 instruction so we need to add the pointer |
| // extracted from the resource descriptor to the current value of VAddr. |
| unsigned NewVAddrLo = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass); |
| unsigned NewVAddrHi = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass); |
| |
| // NewVaddrLo = SRsrcPtr:sub0 + VAddr:sub0 |
| DebugLoc DL = MI->getDebugLoc(); |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_ADD_I32_e32), NewVAddrLo) |
| .addReg(SRsrcPtr, 0, AMDGPU::sub0) |
| .addReg(VAddr->getReg(), 0, AMDGPU::sub0); |
| |
| // NewVaddrHi = SRsrcPtr:sub1 + VAddr:sub1 |
| BuildMI(MBB, MI, DL, get(AMDGPU::V_ADDC_U32_e32), NewVAddrHi) |
| .addReg(SRsrcPtr, 0, AMDGPU::sub1) |
| .addReg(VAddr->getReg(), 0, AMDGPU::sub1); |
| |
| // NewVaddr = {NewVaddrHi, NewVaddrLo} |
| BuildMI(MBB, MI, MI->getDebugLoc(), get(AMDGPU::REG_SEQUENCE), NewVAddr) |
| .addReg(NewVAddrLo) |
| .addImm(AMDGPU::sub0) |
| .addReg(NewVAddrHi) |
| .addImm(AMDGPU::sub1); |
| } else { |
| // This instructions is the _OFFSET variant, so we need to convert it to |
| // ADDR64. |
| assert(MBB.getParent()->getSubtarget<AMDGPUSubtarget>().getGeneration() |
| < AMDGPUSubtarget::VOLCANIC_ISLANDS && |
| "FIXME: Need to emit flat atomics here"); |
| |
| MachineOperand *VData = getNamedOperand(*MI, AMDGPU::OpName::vdata); |
| MachineOperand *Offset = getNamedOperand(*MI, AMDGPU::OpName::offset); |
| MachineOperand *SOffset = getNamedOperand(*MI, AMDGPU::OpName::soffset); |
| unsigned Addr64Opcode = AMDGPU::getAddr64Inst(MI->getOpcode()); |
| |
| // Atomics rith return have have an additional tied operand and are |
| // missing some of the special bits. |
| MachineOperand *VDataIn = getNamedOperand(*MI, AMDGPU::OpName::vdata_in); |
| MachineInstr *Addr64; |
| |
| if (!VDataIn) { |
| // Regular buffer load / store. |
| MachineInstrBuilder MIB |
| = BuildMI(MBB, MI, MI->getDebugLoc(), get(Addr64Opcode)) |
| .addOperand(*VData) |
| .addReg(AMDGPU::NoRegister) // Dummy value for vaddr. |
| // This will be replaced later |
| // with the new value of vaddr. |
| .addOperand(*SRsrc) |
| .addOperand(*SOffset) |
| .addOperand(*Offset); |
| |
| // Atomics do not have this operand. |
| if (const MachineOperand *GLC |
| = getNamedOperand(*MI, AMDGPU::OpName::glc)) { |
| MIB.addImm(GLC->getImm()); |
| } |
| |
| MIB.addImm(getNamedImmOperand(*MI, AMDGPU::OpName::slc)); |
| |
| if (const MachineOperand *TFE |
| = getNamedOperand(*MI, AMDGPU::OpName::tfe)) { |
| MIB.addImm(TFE->getImm()); |
| } |
| |
| MIB.setMemRefs(MI->memoperands_begin(), MI->memoperands_end()); |
| Addr64 = MIB; |
| } else { |
| // Atomics with return. |
| Addr64 = BuildMI(MBB, MI, MI->getDebugLoc(), get(Addr64Opcode)) |
| .addOperand(*VData) |
| .addOperand(*VDataIn) |
| .addReg(AMDGPU::NoRegister) // Dummy value for vaddr. |
| // This will be replaced later |
| // with the new value of vaddr. |
| .addOperand(*SRsrc) |
| .addOperand(*SOffset) |
| .addOperand(*Offset) |
| .addImm(getNamedImmOperand(*MI, AMDGPU::OpName::slc)) |
| .setMemRefs(MI->memoperands_begin(), MI->memoperands_end()); |
| } |
| |
| MI->removeFromParent(); |
| MI = Addr64; |
| |
| // NewVaddr = {NewVaddrHi, NewVaddrLo} |
| BuildMI(MBB, MI, MI->getDebugLoc(), get(AMDGPU::REG_SEQUENCE), NewVAddr) |
| .addReg(SRsrcPtr, 0, AMDGPU::sub0) |
| .addImm(AMDGPU::sub0) |
| .addReg(SRsrcPtr, 0, AMDGPU::sub1) |
| .addImm(AMDGPU::sub1); |
| |
| VAddr = getNamedOperand(*MI, AMDGPU::OpName::vaddr); |
| SRsrc = getNamedOperand(*MI, AMDGPU::OpName::srsrc); |
| } |
| |
| // Update the instruction to use NewVaddr |
| VAddr->setReg(NewVAddr); |
| // Update the instruction to use NewSRsrc |
| SRsrc->setReg(NewSRsrc); |
| } |
| } |
| |
| void SIInstrInfo::splitSMRD(MachineInstr *MI, |
| const TargetRegisterClass *HalfRC, |
| unsigned HalfImmOp, unsigned HalfSGPROp, |
| MachineInstr *&Lo, MachineInstr *&Hi) const { |
| |
| DebugLoc DL = MI->getDebugLoc(); |
| MachineBasicBlock *MBB = MI->getParent(); |
| MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo(); |
| unsigned RegLo = MRI.createVirtualRegister(HalfRC); |
| unsigned RegHi = MRI.createVirtualRegister(HalfRC); |
| unsigned HalfSize = HalfRC->getSize(); |
| const MachineOperand *OffOp = |
| getNamedOperand(*MI, AMDGPU::OpName::offset); |
| const MachineOperand *SBase = getNamedOperand(*MI, AMDGPU::OpName::sbase); |
| |
| // The SMRD has an 8-bit offset in dwords on SI and a 20-bit offset in bytes |
| // on VI. |
| |
| bool IsKill = SBase->isKill(); |
| if (OffOp) { |
| bool isVI = |
| MBB->getParent()->getSubtarget<AMDGPUSubtarget>().getGeneration() >= |
| AMDGPUSubtarget::VOLCANIC_ISLANDS; |
| unsigned OffScale = isVI ? 1 : 4; |
| // Handle the _IMM variant |
| unsigned LoOffset = OffOp->getImm() * OffScale; |
| unsigned HiOffset = LoOffset + HalfSize; |
| Lo = BuildMI(*MBB, MI, DL, get(HalfImmOp), RegLo) |
| // Use addReg instead of addOperand |
| // to make sure kill flag is cleared. |
| .addReg(SBase->getReg(), 0, SBase->getSubReg()) |
| .addImm(LoOffset / OffScale); |
| |
| if (!isUInt<20>(HiOffset) || (!isVI && !isUInt<8>(HiOffset / OffScale))) { |
| unsigned OffsetSGPR = |
| MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass); |
| BuildMI(*MBB, MI, DL, get(AMDGPU::S_MOV_B32), OffsetSGPR) |
| .addImm(HiOffset); // The offset in register is in bytes. |
| Hi = BuildMI(*MBB, MI, DL, get(HalfSGPROp), RegHi) |
| .addReg(SBase->getReg(), getKillRegState(IsKill), |
| SBase->getSubReg()) |
| .addReg(OffsetSGPR); |
| } else { |
| Hi = BuildMI(*MBB, MI, DL, get(HalfImmOp), RegHi) |
| .addReg(SBase->getReg(), getKillRegState(IsKill), |
| SBase->getSubReg()) |
| .addImm(HiOffset / OffScale); |
| } |
| } else { |
| // Handle the _SGPR variant |
| MachineOperand *SOff = getNamedOperand(*MI, AMDGPU::OpName::soff); |
| Lo = BuildMI(*MBB, MI, DL, get(HalfSGPROp), RegLo) |
| .addReg(SBase->getReg(), 0, SBase->getSubReg()) |
| .addOperand(*SOff); |
| unsigned OffsetSGPR = MRI.createVirtualRegister(&AMDGPU::SReg_32RegClass); |
| BuildMI(*MBB, MI, DL, get(AMDGPU::S_ADD_I32), OffsetSGPR) |
| .addReg(SOff->getReg(), 0, SOff->getSubReg()) |
| .addImm(HalfSize); |
| Hi = BuildMI(*MBB, MI, DL, get(HalfSGPROp), RegHi) |
| .addReg(SBase->getReg(), getKillRegState(IsKill), |
| SBase->getSubReg()) |
| .addReg(OffsetSGPR); |
| } |
| |
| unsigned SubLo, SubHi; |
| const TargetRegisterClass *NewDstRC; |
| switch (HalfSize) { |
| case 4: |
| SubLo = AMDGPU::sub0; |
| SubHi = AMDGPU::sub1; |
| NewDstRC = &AMDGPU::VReg_64RegClass; |
| break; |
| case 8: |
| SubLo = AMDGPU::sub0_sub1; |
| SubHi = AMDGPU::sub2_sub3; |
| NewDstRC = &AMDGPU::VReg_128RegClass; |
| break; |
| case 16: |
| SubLo = AMDGPU::sub0_sub1_sub2_sub3; |
| SubHi = AMDGPU::sub4_sub5_sub6_sub7; |
| NewDstRC = &AMDGPU::VReg_256RegClass; |
| break; |
| case 32: |
| SubLo = AMDGPU::sub0_sub1_sub2_sub3_sub4_sub5_sub6_sub7; |
| SubHi = AMDGPU::sub8_sub9_sub10_sub11_sub12_sub13_sub14_sub15; |
| NewDstRC = &AMDGPU::VReg_512RegClass; |
| break; |
| default: |
| llvm_unreachable("Unhandled HalfSize"); |
| } |
| |
| unsigned OldDst = MI->getOperand(0).getReg(); |
| unsigned NewDst = MRI.createVirtualRegister(NewDstRC); |
| |
| MRI.replaceRegWith(OldDst, NewDst); |
| |
| BuildMI(*MBB, MI, DL, get(AMDGPU::REG_SEQUENCE), NewDst) |
| .addReg(RegLo) |
| .addImm(SubLo) |
| .addReg(RegHi) |
| .addImm(SubHi); |
| } |
| |
| void SIInstrInfo::moveSMRDToVALU(MachineInstr *MI, |
| MachineRegisterInfo &MRI, |
| SmallVectorImpl<MachineInstr *> &Worklist) const { |
| MachineBasicBlock *MBB = MI->getParent(); |
| int DstIdx = AMDGPU::getNamedOperandIdx(MI->getOpcode(), AMDGPU::OpName::dst); |
| assert(DstIdx != -1); |
| unsigned DstRCID = get(MI->getOpcode()).OpInfo[DstIdx].RegClass; |
| switch(RI.getRegClass(DstRCID)->getSize()) { |
| case 4: |
| case 8: |
| case 16: { |
| unsigned NewOpcode = getVALUOp(*MI); |
| unsigned RegOffset; |
| unsigned ImmOffset; |
| |
| if (MI->getOperand(2).isReg()) { |
| RegOffset = MI->getOperand(2).getReg(); |
| ImmOffset = 0; |
| } else { |
| assert(MI->getOperand(2).isImm()); |
| // SMRD instructions take a dword offsets on SI and byte offset on VI |
| // and MUBUF instructions always take a byte offset. |
| ImmOffset = MI->getOperand(2).getImm(); |
| if (MBB->getParent()->getSubtarget<AMDGPUSubtarget>().getGeneration() <= |
| AMDGPUSubtarget::SEA_ISLANDS) |
| ImmOffset <<= 2; |
| RegOffset = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass); |
| |
| if (isUInt<12>(ImmOffset)) { |
| BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::S_MOV_B32), |
| RegOffset) |
| .addImm(0); |
| } else { |
| BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::S_MOV_B32), |
| RegOffset) |
| .addImm(ImmOffset); |
| ImmOffset = 0; |
| } |
| } |
| |
| unsigned SRsrc = MRI.createVirtualRegister(&AMDGPU::SReg_128RegClass); |
| unsigned DWord0 = RegOffset; |
| unsigned DWord1 = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass); |
| unsigned DWord2 = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass); |
| unsigned DWord3 = MRI.createVirtualRegister(&AMDGPU::SGPR_32RegClass); |
| uint64_t RsrcDataFormat = getDefaultRsrcDataFormat(); |
| |
| BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::S_MOV_B32), DWord1) |
| .addImm(0); |
| BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::S_MOV_B32), DWord2) |
| .addImm(RsrcDataFormat & 0xFFFFFFFF); |
| BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::S_MOV_B32), DWord3) |
| .addImm(RsrcDataFormat >> 32); |
| BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::REG_SEQUENCE), SRsrc) |
| .addReg(DWord0) |
| .addImm(AMDGPU::sub0) |
| .addReg(DWord1) |
| .addImm(AMDGPU::sub1) |
| .addReg(DWord2) |
| .addImm(AMDGPU::sub2) |
| .addReg(DWord3) |
| .addImm(AMDGPU::sub3); |
| |
| const MCInstrDesc &NewInstDesc = get(NewOpcode); |
| const TargetRegisterClass *NewDstRC |
| = RI.getRegClass(NewInstDesc.OpInfo[0].RegClass); |
| unsigned NewDstReg = MRI.createVirtualRegister(NewDstRC); |
| unsigned DstReg = MI->getOperand(0).getReg(); |
| MRI.replaceRegWith(DstReg, NewDstReg); |
| |
| MachineInstr *NewInst = |
| BuildMI(*MBB, MI, MI->getDebugLoc(), NewInstDesc, NewDstReg) |
| .addOperand(MI->getOperand(1)) // sbase |
| .addReg(SRsrc) |
| .addImm(0) |
| .addImm(ImmOffset) |
| .addImm(0) // glc |
| .addImm(0) // slc |
| .addImm(0) // tfe |
| .setMemRefs(MI->memoperands_begin(), MI->memoperands_end()); |
| MI->eraseFromParent(); |
| |
| legalizeOperands(NewInst); |
| addUsersToMoveToVALUWorklist(NewDstReg, MRI, Worklist); |
| break; |
| } |
| case 32: { |
| MachineInstr *Lo, *Hi; |
| splitSMRD(MI, &AMDGPU::SReg_128RegClass, AMDGPU::S_LOAD_DWORDX4_IMM, |
| AMDGPU::S_LOAD_DWORDX4_SGPR, Lo, Hi); |
| MI->eraseFromParent(); |
| moveSMRDToVALU(Lo, MRI, Worklist); |
| moveSMRDToVALU(Hi, MRI, Worklist); |
| break; |
| } |
| |
| case 64: { |
| MachineInstr *Lo, *Hi; |
| splitSMRD(MI, &AMDGPU::SReg_256RegClass, AMDGPU::S_LOAD_DWORDX8_IMM, |
| AMDGPU::S_LOAD_DWORDX8_SGPR, Lo, Hi); |
| MI->eraseFromParent(); |
| moveSMRDToVALU(Lo, MRI, Worklist); |
| moveSMRDToVALU(Hi, MRI, Worklist); |
| break; |
| } |
| } |
| } |
| |
| void SIInstrInfo::moveToVALU(MachineInstr &TopInst) const { |
| SmallVector<MachineInstr *, 128> Worklist; |
| Worklist.push_back(&TopInst); |
| |
| while (!Worklist.empty()) { |
| MachineInstr *Inst = Worklist.pop_back_val(); |
| MachineBasicBlock *MBB = Inst->getParent(); |
| MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo(); |
| |
| unsigned Opcode = Inst->getOpcode(); |
| unsigned NewOpcode = getVALUOp(*Inst); |
| |
| // Handle some special cases |
| switch (Opcode) { |
| default: |
| if (isSMRD(*Inst)) { |
| moveSMRDToVALU(Inst, MRI, Worklist); |
| continue; |
| } |
| break; |
| case AMDGPU::S_AND_B64: |
| splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::V_AND_B32_e64); |
| Inst->eraseFromParent(); |
| continue; |
| |
| case AMDGPU::S_OR_B64: |
| splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::V_OR_B32_e64); |
| Inst->eraseFromParent(); |
| continue; |
| |
| case AMDGPU::S_XOR_B64: |
| splitScalar64BitBinaryOp(Worklist, Inst, AMDGPU::V_XOR_B32_e64); |
| Inst->eraseFromParent(); |
| continue; |
| |
| case AMDGPU::S_NOT_B64: |
| splitScalar64BitUnaryOp(Worklist, Inst, AMDGPU::V_NOT_B32_e32); |
| Inst->eraseFromParent(); |
| continue; |
| |
| case AMDGPU::S_BCNT1_I32_B64: |
| splitScalar64BitBCNT(Worklist, Inst); |
| Inst->eraseFromParent(); |
| continue; |
| |
| case AMDGPU::S_BFE_I64: { |
| splitScalar64BitBFE(Worklist, Inst); |
| Inst->eraseFromParent(); |
| continue; |
| } |
| |
| case AMDGPU::S_LSHL_B32: |
| if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) { |
| NewOpcode = AMDGPU::V_LSHLREV_B32_e64; |
| swapOperands(Inst); |
| } |
| break; |
| case AMDGPU::S_ASHR_I32: |
| if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) { |
| NewOpcode = AMDGPU::V_ASHRREV_I32_e64; |
| swapOperands(Inst); |
| } |
| break; |
| case AMDGPU::S_LSHR_B32: |
| if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) { |
| NewOpcode = AMDGPU::V_LSHRREV_B32_e64; |
| swapOperands(Inst); |
| } |
| break; |
| case AMDGPU::S_LSHL_B64: |
| if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) { |
| NewOpcode = AMDGPU::V_LSHLREV_B64; |
| swapOperands(Inst); |
| } |
| break; |
| case AMDGPU::S_ASHR_I64: |
| if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) { |
| NewOpcode = AMDGPU::V_ASHRREV_I64; |
| swapOperands(Inst); |
| } |
| break; |
| case AMDGPU::S_LSHR_B64: |
| if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) { |
| NewOpcode = AMDGPU::V_LSHRREV_B64; |
| swapOperands(Inst); |
| } |
| break; |
| |
| case AMDGPU::S_ABS_I32: |
| lowerScalarAbs(Worklist, Inst); |
| Inst->eraseFromParent(); |
| continue; |
| |
| case AMDGPU::S_BFE_U64: |
| case AMDGPU::S_BFM_B64: |
| llvm_unreachable("Moving this op to VALU not implemented"); |
| } |
| |
| if (NewOpcode == AMDGPU::INSTRUCTION_LIST_END) { |
| // We cannot move this instruction to the VALU, so we should try to |
| // legalize its operands instead. |
| legalizeOperands(Inst); |
| continue; |
| } |
| |
| // Use the new VALU Opcode. |
| const MCInstrDesc &NewDesc = get(NewOpcode); |
| Inst->setDesc(NewDesc); |
| |
| // Remove any references to SCC. Vector instructions can't read from it, and |
| // We're just about to add the implicit use / defs of VCC, and we don't want |
| // both. |
| for (unsigned i = Inst->getNumOperands() - 1; i > 0; --i) { |
| MachineOperand &Op = Inst->getOperand(i); |
| if (Op.isReg() && Op.getReg() == AMDGPU::SCC) |
| Inst->RemoveOperand(i); |
| } |
| |
| if (Opcode == AMDGPU::S_SEXT_I32_I8 || Opcode == AMDGPU::S_SEXT_I32_I16) { |
| // We are converting these to a BFE, so we need to add the missing |
| // operands for the size and offset. |
| unsigned Size = (Opcode == AMDGPU::S_SEXT_I32_I8) ? 8 : 16; |
| Inst->addOperand(MachineOperand::CreateImm(0)); |
| Inst->addOperand(MachineOperand::CreateImm(Size)); |
| |
| } else if (Opcode == AMDGPU::S_BCNT1_I32_B32) { |
| // The VALU version adds the second operand to the result, so insert an |
| // extra 0 operand. |
| Inst->addOperand(MachineOperand::CreateImm(0)); |
| } |
| |
| Inst->addImplicitDefUseOperands(*Inst->getParent()->getParent()); |
| |
| if (Opcode == AMDGPU::S_BFE_I32 || Opcode == AMDGPU::S_BFE_U32) { |
| const MachineOperand &OffsetWidthOp = Inst->getOperand(2); |
| // If we need to move this to VGPRs, we need to unpack the second operand |
| // back into the 2 separate ones for bit offset and width. |
| assert(OffsetWidthOp.isImm() && |
| "Scalar BFE is only implemented for constant width and offset"); |
| uint32_t Imm = OffsetWidthOp.getImm(); |
| |
| uint32_t Offset = Imm & 0x3f; // Extract bits [5:0]. |
| uint32_t BitWidth = (Imm & 0x7f0000) >> 16; // Extract bits [22:16]. |
| Inst->RemoveOperand(2); // Remove old immediate. |
| Inst->addOperand(MachineOperand::CreateImm(Offset)); |
| Inst->addOperand(MachineOperand::CreateImm(BitWidth)); |
| } |
| |
| // Update the destination register class. |
| const TargetRegisterClass *NewDstRC = getDestEquivalentVGPRClass(*Inst); |
| if (!NewDstRC) |
| continue; |
| |
| unsigned DstReg = Inst->getOperand(0).getReg(); |
| unsigned NewDstReg = MRI.createVirtualRegister(NewDstRC); |
| MRI.replaceRegWith(DstReg, NewDstReg); |
| |
| // Legalize the operands |
| legalizeOperands(Inst); |
| |
| addUsersToMoveToVALUWorklist(NewDstReg, MRI, Worklist); |
| } |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Indirect addressing callbacks |
| //===----------------------------------------------------------------------===// |
| |
| unsigned SIInstrInfo::calculateIndirectAddress(unsigned RegIndex, |
| unsigned Channel) const { |
| assert(Channel == 0); |
| return RegIndex; |
| } |
| |
| const TargetRegisterClass *SIInstrInfo::getIndirectAddrRegClass() const { |
| return &AMDGPU::VGPR_32RegClass; |
| } |
| |
| void SIInstrInfo::lowerScalarAbs(SmallVectorImpl<MachineInstr *> &Worklist, |
| MachineInstr *Inst) const { |
| MachineBasicBlock &MBB = *Inst->getParent(); |
| MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo(); |
| MachineBasicBlock::iterator MII = Inst; |
| DebugLoc DL = Inst->getDebugLoc(); |
| |
| MachineOperand &Dest = Inst->getOperand(0); |
| MachineOperand &Src = Inst->getOperand(1); |
| unsigned TmpReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass); |
| unsigned ResultReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass); |
| |
| BuildMI(MBB, MII, DL, get(AMDGPU::V_SUB_I32_e32), TmpReg) |
| .addImm(0) |
| .addReg(Src.getReg()); |
| |
| BuildMI(MBB, MII, DL, get(AMDGPU::V_MAX_I32_e64), ResultReg) |
| .addReg(Src.getReg()) |
| .addReg(TmpReg); |
| |
| MRI.replaceRegWith(Dest.getReg(), ResultReg); |
| addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist); |
| } |
| |
| void SIInstrInfo::splitScalar64BitUnaryOp( |
| SmallVectorImpl<MachineInstr *> &Worklist, |
| MachineInstr *Inst, |
| unsigned Opcode) const { |
| MachineBasicBlock &MBB = *Inst->getParent(); |
| MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo(); |
| |
| MachineOperand &Dest = Inst->getOperand(0); |
| MachineOperand &Src0 = Inst->getOperand(1); |
| DebugLoc DL = Inst->getDebugLoc(); |
| |
| MachineBasicBlock::iterator MII = Inst; |
| |
| const MCInstrDesc &InstDesc = get(Opcode); |
| const TargetRegisterClass *Src0RC = Src0.isReg() ? |
| MRI.getRegClass(Src0.getReg()) : |
| &AMDGPU::SGPR_32RegClass; |
| |
| const TargetRegisterClass *Src0SubRC = RI.getSubRegClass(Src0RC, AMDGPU::sub0); |
| |
| MachineOperand SrcReg0Sub0 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC, |
| AMDGPU::sub0, Src0SubRC); |
| |
| const TargetRegisterClass *DestRC = MRI.getRegClass(Dest.getReg()); |
| const TargetRegisterClass *NewDestRC = RI.getEquivalentVGPRClass(DestRC); |
| const TargetRegisterClass *NewDestSubRC = RI.getSubRegClass(NewDestRC, AMDGPU::sub0); |
| |
| unsigned DestSub0 = MRI.createVirtualRegister(NewDestSubRC); |
| BuildMI(MBB, MII, DL, InstDesc, DestSub0) |
| .addOperand(SrcReg0Sub0); |
| |
| MachineOperand SrcReg0Sub1 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC, |
| AMDGPU::sub1, Src0SubRC); |
| |
| unsigned DestSub1 = MRI.createVirtualRegister(NewDestSubRC); |
| BuildMI(MBB, MII, DL, InstDesc, DestSub1) |
| .addOperand(SrcReg0Sub1); |
| |
| unsigned FullDestReg = MRI.createVirtualRegister(NewDestRC); |
| BuildMI(MBB, MII, DL, get(TargetOpcode::REG_SEQUENCE), FullDestReg) |
| .addReg(DestSub0) |
| .addImm(AMDGPU::sub0) |
| .addReg(DestSub1) |
| .addImm(AMDGPU::sub1); |
| |
| MRI.replaceRegWith(Dest.getReg(), FullDestReg); |
| |
| // We don't need to legalizeOperands here because for a single operand, src0 |
| // will support any kind of input. |
| |
| // Move all users of this moved value. |
| addUsersToMoveToVALUWorklist(FullDestReg, MRI, Worklist); |
| } |
| |
| void SIInstrInfo::splitScalar64BitBinaryOp( |
| SmallVectorImpl<MachineInstr *> &Worklist, |
| MachineInstr *Inst, |
| unsigned Opcode) const { |
| MachineBasicBlock &MBB = *Inst->getParent(); |
| MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo(); |
| |
| MachineOperand &Dest = Inst->getOperand(0); |
| MachineOperand &Src0 = Inst->getOperand(1); |
| MachineOperand &Src1 = Inst->getOperand(2); |
| DebugLoc DL = Inst->getDebugLoc(); |
| |
| MachineBasicBlock::iterator MII = Inst; |
| |
| const MCInstrDesc &InstDesc = get(Opcode); |
| const TargetRegisterClass *Src0RC = Src0.isReg() ? |
| MRI.getRegClass(Src0.getReg()) : |
| &AMDGPU::SGPR_32RegClass; |
| |
| const TargetRegisterClass *Src0SubRC = RI.getSubRegClass(Src0RC, AMDGPU::sub0); |
| const TargetRegisterClass *Src1RC = Src1.isReg() ? |
| MRI.getRegClass(Src1.getReg()) : |
| &AMDGPU::SGPR_32RegClass; |
| |
| const TargetRegisterClass *Src1SubRC = RI.getSubRegClass(Src1RC, AMDGPU::sub0); |
| |
| MachineOperand SrcReg0Sub0 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC, |
| AMDGPU::sub0, Src0SubRC); |
| MachineOperand SrcReg1Sub0 = buildExtractSubRegOrImm(MII, MRI, Src1, Src1RC, |
| AMDGPU::sub0, Src1SubRC); |
| |
| const TargetRegisterClass *DestRC = MRI.getRegClass(Dest.getReg()); |
| const TargetRegisterClass *NewDestRC = RI.getEquivalentVGPRClass(DestRC); |
| const TargetRegisterClass *NewDestSubRC = RI.getSubRegClass(NewDestRC, AMDGPU::sub0); |
| |
| unsigned DestSub0 = MRI.createVirtualRegister(NewDestSubRC); |
| MachineInstr *LoHalf = BuildMI(MBB, MII, DL, InstDesc, DestSub0) |
| .addOperand(SrcReg0Sub0) |
| .addOperand(SrcReg1Sub0); |
| |
| MachineOperand SrcReg0Sub1 = buildExtractSubRegOrImm(MII, MRI, Src0, Src0RC, |
| AMDGPU::sub1, Src0SubRC); |
| MachineOperand SrcReg1Sub1 = buildExtractSubRegOrImm(MII, MRI, Src1, Src1RC, |
| AMDGPU::sub1, Src1SubRC); |
| |
| unsigned DestSub1 = MRI.createVirtualRegister(NewDestSubRC); |
| MachineInstr *HiHalf = BuildMI(MBB, MII, DL, InstDesc, DestSub1) |
| .addOperand(SrcReg0Sub1) |
| .addOperand(SrcReg1Sub1); |
| |
| unsigned FullDestReg = MRI.createVirtualRegister(NewDestRC); |
| BuildMI(MBB, MII, DL, get(TargetOpcode::REG_SEQUENCE), FullDestReg) |
| .addReg(DestSub0) |
| .addImm(AMDGPU::sub0) |
| .addReg(DestSub1) |
| .addImm(AMDGPU::sub1); |
| |
| MRI.replaceRegWith(Dest.getReg(), FullDestReg); |
| |
| // Try to legalize the operands in case we need to swap the order to keep it |
| // valid. |
| legalizeOperands(LoHalf); |
| legalizeOperands(HiHalf); |
| |
| // Move all users of this moved vlaue. |
| addUsersToMoveToVALUWorklist(FullDestReg, MRI, Worklist); |
| } |
| |
| void SIInstrInfo::splitScalar64BitBCNT(SmallVectorImpl<MachineInstr *> &Worklist, |
| MachineInstr *Inst) const { |
| MachineBasicBlock &MBB = *Inst->getParent(); |
| MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo(); |
| |
| MachineBasicBlock::iterator MII = Inst; |
| DebugLoc DL = Inst->getDebugLoc(); |
| |
| MachineOperand &Dest = Inst->getOperand(0); |
| MachineOperand &Src = Inst->getOperand(1); |
| |
| const MCInstrDesc &InstDesc = get(AMDGPU::V_BCNT_U32_B32_e64); |
| const TargetRegisterClass *SrcRC = Src.isReg() ? |
| MRI.getRegClass(Src.getReg()) : |
| &AMDGPU::SGPR_32RegClass; |
| |
| unsigned MidReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass); |
| unsigned ResultReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass); |
| |
| const TargetRegisterClass *SrcSubRC = RI.getSubRegClass(SrcRC, AMDGPU::sub0); |
| |
| MachineOperand SrcRegSub0 = buildExtractSubRegOrImm(MII, MRI, Src, SrcRC, |
| AMDGPU::sub0, SrcSubRC); |
| MachineOperand SrcRegSub1 = buildExtractSubRegOrImm(MII, MRI, Src, SrcRC, |
| AMDGPU::sub1, SrcSubRC); |
| |
| BuildMI(MBB, MII, DL, InstDesc, MidReg) |
| .addOperand(SrcRegSub0) |
| .addImm(0); |
| |
| BuildMI(MBB, MII, DL, InstDesc, ResultReg) |
| .addOperand(SrcRegSub1) |
| .addReg(MidReg); |
| |
| MRI.replaceRegWith(Dest.getReg(), ResultReg); |
| |
| // We don't need to legalize operands here. src0 for etiher instruction can be |
| // an SGPR, and the second input is unused or determined here. |
| addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist); |
| } |
| |
| void SIInstrInfo::splitScalar64BitBFE(SmallVectorImpl<MachineInstr *> &Worklist, |
| MachineInstr *Inst) const { |
| MachineBasicBlock &MBB = *Inst->getParent(); |
| MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo(); |
| MachineBasicBlock::iterator MII = Inst; |
| DebugLoc DL = Inst->getDebugLoc(); |
| |
| MachineOperand &Dest = Inst->getOperand(0); |
| uint32_t Imm = Inst->getOperand(2).getImm(); |
| uint32_t Offset = Imm & 0x3f; // Extract bits [5:0]. |
| uint32_t BitWidth = (Imm & 0x7f0000) >> 16; // Extract bits [22:16]. |
| |
| (void) Offset; |
| |
| // Only sext_inreg cases handled. |
| assert(Inst->getOpcode() == AMDGPU::S_BFE_I64 && |
| BitWidth <= 32 && |
| Offset == 0 && |
| "Not implemented"); |
| |
| if (BitWidth < 32) { |
| unsigned MidRegLo = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass); |
| unsigned MidRegHi = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass); |
| unsigned ResultReg = MRI.createVirtualRegister(&AMDGPU::VReg_64RegClass); |
| |
| BuildMI(MBB, MII, DL, get(AMDGPU::V_BFE_I32), MidRegLo) |
| .addReg(Inst->getOperand(1).getReg(), 0, AMDGPU::sub0) |
| .addImm(0) |
| .addImm(BitWidth); |
| |
| BuildMI(MBB, MII, DL, get(AMDGPU::V_ASHRREV_I32_e32), MidRegHi) |
| .addImm(31) |
| .addReg(MidRegLo); |
| |
| BuildMI(MBB, MII, DL, get(TargetOpcode::REG_SEQUENCE), ResultReg) |
| .addReg(MidRegLo) |
| .addImm(AMDGPU::sub0) |
| .addReg(MidRegHi) |
| .addImm(AMDGPU::sub1); |
| |
| MRI.replaceRegWith(Dest.getReg(), ResultReg); |
| addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist); |
| return; |
| } |
| |
| MachineOperand &Src = Inst->getOperand(1); |
| unsigned TmpReg = MRI.createVirtualRegister(&AMDGPU::VGPR_32RegClass); |
| unsigned ResultReg = MRI.createVirtualRegister(&AMDGPU::VReg_64RegClass); |
| |
| BuildMI(MBB, MII, DL, get(AMDGPU::V_ASHRREV_I32_e64), TmpReg) |
| .addImm(31) |
| .addReg(Src.getReg(), 0, AMDGPU::sub0); |
| |
| BuildMI(MBB, MII, DL, get(TargetOpcode::REG_SEQUENCE), ResultReg) |
| .addReg(Src.getReg(), 0, AMDGPU::sub0) |
| .addImm(AMDGPU::sub0) |
| .addReg(TmpReg) |
| .addImm(AMDGPU::sub1); |
| |
| MRI.replaceRegWith(Dest.getReg(), ResultReg); |
| addUsersToMoveToVALUWorklist(ResultReg, MRI, Worklist); |
| } |
| |
| void SIInstrInfo::addUsersToMoveToVALUWorklist( |
| unsigned DstReg, |
| MachineRegisterInfo &MRI, |
| SmallVectorImpl<MachineInstr *> &Worklist) const { |
| for (MachineRegisterInfo::use_iterator I = MRI.use_begin(DstReg), |
| E = MRI.use_end(); I != E; ++I) { |
| MachineInstr &UseMI = *I->getParent(); |
| if (!canReadVGPR(UseMI, I.getOperandNo())) { |
| Worklist.push_back(&UseMI); |
| } |
| } |
| } |
| |
| const TargetRegisterClass *SIInstrInfo::getDestEquivalentVGPRClass( |
| const MachineInstr &Inst) const { |
| const TargetRegisterClass *NewDstRC = getOpRegClass(Inst, 0); |
| |
| switch (Inst.getOpcode()) { |
| // For target instructions, getOpRegClass just returns the virtual register |
| // class associated with the operand, so we need to find an equivalent VGPR |
| // register class in order to move the instruction to the VALU. |
| case AMDGPU::COPY: |
| case AMDGPU::PHI: |
| case AMDGPU::REG_SEQUENCE: |
| case AMDGPU::INSERT_SUBREG: |
| if (RI.hasVGPRs(NewDstRC)) |
| return nullptr; |
| |
| NewDstRC = RI.getEquivalentVGPRClass(NewDstRC); |
| if (!NewDstRC) |
| return nullptr; |
| return NewDstRC; |
| default: |
| return NewDstRC; |
| } |
| } |
| |
| // Find the one SGPR operand we are allowed to use. |
| unsigned SIInstrInfo::findUsedSGPR(const MachineInstr *MI, |
| int OpIndices[3]) const { |
| const MCInstrDesc &Desc = MI->getDesc(); |
| |
| // Find the one SGPR operand we are allowed to use. |
| // |
| // First we need to consider the instruction's operand requirements before |
| // legalizing. Some operands are required to be SGPRs, such as implicit uses |
| // of VCC, but we are still bound by the constant bus requirement to only use |
| // one. |
| // |
| // If the operand's class is an SGPR, we can never move it. |
| |
| unsigned SGPRReg = findImplicitSGPRRead(*MI); |
| if (SGPRReg != AMDGPU::NoRegister) |
| return SGPRReg; |
| |
| unsigned UsedSGPRs[3] = { AMDGPU::NoRegister }; |
| const MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo(); |
| |
| for (unsigned i = 0; i < 3; ++i) { |
| int Idx = OpIndices[i]; |
| if (Idx == -1) |
| break; |
| |
| const MachineOperand &MO = MI->getOperand(Idx); |
| if (!MO.isReg()) |
| continue; |
| |
| // Is this operand statically required to be an SGPR based on the operand |
| // constraints? |
| const TargetRegisterClass *OpRC = RI.getRegClass(Desc.OpInfo[Idx].RegClass); |
| bool IsRequiredSGPR = RI.isSGPRClass(OpRC); |
| if (IsRequiredSGPR) |
| return MO.getReg(); |
| |
| // If this could be a VGPR or an SGPR, Check the dynamic register class. |
| unsigned Reg = MO.getReg(); |
| const TargetRegisterClass *RegRC = MRI.getRegClass(Reg); |
| if (RI.isSGPRClass(RegRC)) |
| UsedSGPRs[i] = Reg; |
| } |
| |
| // We don't have a required SGPR operand, so we have a bit more freedom in |
| // selecting operands to move. |
| |
| // Try to select the most used SGPR. If an SGPR is equal to one of the |
| // others, we choose that. |
| // |
| // e.g. |
| // V_FMA_F32 v0, s0, s0, s0 -> No moves |
| // V_FMA_F32 v0, s0, s1, s0 -> Move s1 |
| |
| // TODO: If some of the operands are 64-bit SGPRs and some 32, we should |
| // prefer those. |
| |
| if (UsedSGPRs[0] != AMDGPU::NoRegister) { |
| if (UsedSGPRs[0] == UsedSGPRs[1] || UsedSGPRs[0] == UsedSGPRs[2]) |
| SGPRReg = UsedSGPRs[0]; |
| } |
| |
| if (SGPRReg == AMDGPU::NoRegister && UsedSGPRs[1] != AMDGPU::NoRegister) { |
| if (UsedSGPRs[1] == UsedSGPRs[2]) |
| SGPRReg = UsedSGPRs[1]; |
| } |
| |
| return SGPRReg; |
| } |
| |
| MachineInstrBuilder SIInstrInfo::buildIndirectWrite( |
| MachineBasicBlock *MBB, |
| MachineBasicBlock::iterator I, |
| unsigned ValueReg, |
| unsigned Address, unsigned OffsetReg) const { |
| const DebugLoc &DL = MBB->findDebugLoc(I); |
| unsigned IndirectBaseReg = AMDGPU::VGPR_32RegClass.getRegister( |
| getIndirectIndexBegin(*MBB->getParent())); |
| |
| return BuildMI(*MBB, I, DL, get(AMDGPU::SI_INDIRECT_DST_V1)) |
| .addReg(IndirectBaseReg, RegState::Define) |
| .addOperand(I->getOperand(0)) |
| .addReg(IndirectBaseReg) |
| .addReg(OffsetReg) |
| .addImm(0) |
| .addReg(ValueReg); |
| } |
| |
| MachineInstrBuilder SIInstrInfo::buildIndirectRead( |
| MachineBasicBlock *MBB, |
| MachineBasicBlock::iterator I, |
| unsigned ValueReg, |
| unsigned Address, unsigned OffsetReg) const { |
| const DebugLoc &DL = MBB->findDebugLoc(I); |
| unsigned IndirectBaseReg = AMDGPU::VGPR_32RegClass.getRegister( |
| getIndirectIndexBegin(*MBB->getParent())); |
| |
| return BuildMI(*MBB, I, DL, get(AMDGPU::SI_INDIRECT_SRC_V1)) |
| .addOperand(I->getOperand(0)) |
| .addOperand(I->getOperand(1)) |
| .addReg(IndirectBaseReg) |
| .addReg(OffsetReg) |
| .addImm(0); |
| |
| } |
| |
| void SIInstrInfo::reserveIndirectRegisters(BitVector &Reserved, |
| const MachineFunction &MF) const { |
| int End = getIndirectIndexEnd(MF); |
| int Begin = getIndirectIndexBegin(MF); |
| |
| if (End == -1) |
| return; |
| |
| |
| for (int Index = Begin; Index <= End; ++Index) |
| Reserved.set(AMDGPU::VGPR_32RegClass.getRegister(Index)); |
| |
| for (int Index = std::max(0, Begin - 1); Index <= End; ++Index) |
| Reserved.set(AMDGPU::VReg_64RegClass.getRegister(Index)); |
| |
| for (int Index = std::max(0, Begin - 2); Index <= End; ++Index) |
| Reserved.set(AMDGPU::VReg_96RegClass.getRegister(Index)); |
| |
| for (int Index = std::max(0, Begin - 3); Index <= End; ++Index) |
| Reserved.set(AMDGPU::VReg_128RegClass.getRegister(Index)); |
| |
| for (int Index = std::max(0, Begin - 7); Index <= End; ++Index) |
| Reserved.set(AMDGPU::VReg_256RegClass.getRegister(Index)); |
| |
| for (int Index = std::max(0, Begin - 15); Index <= End; ++Index) |
| Reserved.set(AMDGPU::VReg_512RegClass.getRegister(Index)); |
| } |
| |
| MachineOperand *SIInstrInfo::getNamedOperand(MachineInstr &MI, |
| unsigned OperandName) const { |
| int Idx = AMDGPU::getNamedOperandIdx(MI.getOpcode(), OperandName); |
| if (Idx == -1) |
| return nullptr; |
| |
| return &MI.getOperand(Idx); |
| } |
| |
| uint64_t SIInstrInfo::getDefaultRsrcDataFormat() const { |
| uint64_t RsrcDataFormat = AMDGPU::RSRC_DATA_FORMAT; |
| if (ST.isAmdHsaOS()) { |
| RsrcDataFormat |= (1ULL << 56); |
| |
| if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) |
| // Set MTYPE = 2 |
| RsrcDataFormat |= (2ULL << 59); |
| } |
| |
| return RsrcDataFormat; |
| } |
| |
| uint64_t SIInstrInfo::getScratchRsrcWords23() const { |
| uint64_t Rsrc23 = getDefaultRsrcDataFormat() | |
| AMDGPU::RSRC_TID_ENABLE | |
| 0xffffffff; // Size; |
| |
| // If TID_ENABLE is set, DATA_FORMAT specifies stride bits [14:17]. |
| // Clear them unless we want a huge stride. |
| if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) |
| Rsrc23 &= ~AMDGPU::RSRC_DATA_FORMAT; |
| |
| return Rsrc23; |
| } |