1054 lines
38 KiB
C++
1054 lines
38 KiB
C++
//===-- RISCVISelDAGToDAG.cpp - A dag to dag inst selector for RISCV ------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an instruction selector for the RISCV target.
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//
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//===----------------------------------------------------------------------===//
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#include "RISCVISelDAGToDAG.h"
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#include "MCTargetDesc/RISCVMCTargetDesc.h"
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#include "MCTargetDesc/RISCVMatInt.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/IR/IntrinsicsRISCV.h"
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#include "llvm/Support/Alignment.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "riscv-isel"
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void RISCVDAGToDAGISel::PostprocessISelDAG() {
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doPeepholeLoadStoreADDI();
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}
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static SDNode *selectImm(SelectionDAG *CurDAG, const SDLoc &DL, int64_t Imm,
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MVT XLenVT) {
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RISCVMatInt::InstSeq Seq;
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RISCVMatInt::generateInstSeq(Imm, XLenVT == MVT::i64, Seq);
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SDNode *Result = nullptr;
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SDValue SrcReg = CurDAG->getRegister(RISCV::X0, XLenVT);
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for (RISCVMatInt::Inst &Inst : Seq) {
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SDValue SDImm = CurDAG->getTargetConstant(Inst.Imm, DL, XLenVT);
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if (Inst.Opc == RISCV::LUI)
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Result = CurDAG->getMachineNode(RISCV::LUI, DL, XLenVT, SDImm);
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else
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Result = CurDAG->getMachineNode(Inst.Opc, DL, XLenVT, SrcReg, SDImm);
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// Only the first instruction has X0 as its source.
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SrcReg = SDValue(Result, 0);
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}
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return Result;
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}
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static RISCVVLMUL getLMUL(EVT VT) {
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switch (VT.getSizeInBits().getKnownMinValue() / 8) {
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default:
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llvm_unreachable("Invalid LMUL.");
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case 1:
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return RISCVVLMUL::LMUL_F8;
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case 2:
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return RISCVVLMUL::LMUL_F4;
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case 4:
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return RISCVVLMUL::LMUL_F2;
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case 8:
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return RISCVVLMUL::LMUL_1;
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case 16:
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return RISCVVLMUL::LMUL_2;
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case 32:
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return RISCVVLMUL::LMUL_4;
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case 64:
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return RISCVVLMUL::LMUL_8;
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}
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}
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static unsigned getSubregIndexByEVT(EVT VT, unsigned Index) {
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RISCVVLMUL LMUL = getLMUL(VT);
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if (LMUL == RISCVVLMUL::LMUL_F8 || LMUL == RISCVVLMUL::LMUL_F4 ||
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LMUL == RISCVVLMUL::LMUL_F2 || LMUL == RISCVVLMUL::LMUL_1) {
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static_assert(RISCV::sub_vrm1_7 == RISCV::sub_vrm1_0 + 7,
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"Unexpected subreg numbering");
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return RISCV::sub_vrm1_0 + Index;
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} else if (LMUL == RISCVVLMUL::LMUL_2) {
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static_assert(RISCV::sub_vrm2_3 == RISCV::sub_vrm2_0 + 3,
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"Unexpected subreg numbering");
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return RISCV::sub_vrm2_0 + Index;
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} else if (LMUL == RISCVVLMUL::LMUL_4) {
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static_assert(RISCV::sub_vrm4_1 == RISCV::sub_vrm4_0 + 1,
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"Unexpected subreg numbering");
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return RISCV::sub_vrm4_0 + Index;
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}
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llvm_unreachable("Invalid vector type.");
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}
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static SDValue createTupleImpl(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
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unsigned RegClassID, unsigned SubReg0) {
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assert(Regs.size() >= 2 && Regs.size() <= 8);
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SDLoc DL(Regs[0]);
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SmallVector<SDValue, 8> Ops;
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Ops.push_back(CurDAG.getTargetConstant(RegClassID, DL, MVT::i32));
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for (unsigned I = 0; I < Regs.size(); ++I) {
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Ops.push_back(Regs[I]);
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Ops.push_back(CurDAG.getTargetConstant(SubReg0 + I, DL, MVT::i32));
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}
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SDNode *N =
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CurDAG.getMachineNode(TargetOpcode::REG_SEQUENCE, DL, MVT::Untyped, Ops);
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return SDValue(N, 0);
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}
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static SDValue createM1Tuple(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
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unsigned NF) {
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static const unsigned RegClassIDs[] = {
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RISCV::VRN2M1RegClassID, RISCV::VRN3M1RegClassID, RISCV::VRN4M1RegClassID,
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RISCV::VRN5M1RegClassID, RISCV::VRN6M1RegClassID, RISCV::VRN7M1RegClassID,
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RISCV::VRN8M1RegClassID};
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return createTupleImpl(CurDAG, Regs, RegClassIDs[NF - 2], RISCV::sub_vrm1_0);
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}
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static SDValue createM2Tuple(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
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unsigned NF) {
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static const unsigned RegClassIDs[] = {RISCV::VRN2M2RegClassID,
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RISCV::VRN3M2RegClassID,
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RISCV::VRN4M2RegClassID};
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return createTupleImpl(CurDAG, Regs, RegClassIDs[NF - 2], RISCV::sub_vrm2_0);
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}
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static SDValue createM4Tuple(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
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unsigned NF) {
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return createTupleImpl(CurDAG, Regs, RISCV::VRN2M4RegClassID,
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RISCV::sub_vrm4_0);
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}
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static SDValue createTuple(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
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unsigned NF, RISCVVLMUL LMUL) {
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switch (LMUL) {
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default:
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llvm_unreachable("Invalid LMUL.");
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case RISCVVLMUL::LMUL_F8:
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case RISCVVLMUL::LMUL_F4:
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case RISCVVLMUL::LMUL_F2:
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case RISCVVLMUL::LMUL_1:
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return createM1Tuple(CurDAG, Regs, NF);
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case RISCVVLMUL::LMUL_2:
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return createM2Tuple(CurDAG, Regs, NF);
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case RISCVVLMUL::LMUL_4:
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return createM4Tuple(CurDAG, Regs, NF);
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}
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}
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void RISCVDAGToDAGISel::selectVLSEG(SDNode *Node, unsigned IntNo,
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bool IsStrided) {
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SDLoc DL(Node);
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unsigned NF = Node->getNumValues() - 1;
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EVT VT = Node->getValueType(0);
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unsigned ScalarSize = VT.getScalarSizeInBits();
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MVT XLenVT = Subtarget->getXLenVT();
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RISCVVLMUL LMUL = getLMUL(VT);
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SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
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SmallVector<SDValue, 5> Operands;
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Operands.push_back(Node->getOperand(2)); // Base pointer.
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if (IsStrided) {
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Operands.push_back(Node->getOperand(3)); // Stride.
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Operands.push_back(Node->getOperand(4)); // VL.
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} else {
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Operands.push_back(Node->getOperand(3)); // VL.
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}
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Operands.push_back(SEW);
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Operands.push_back(Node->getOperand(0)); // Chain.
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const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
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IntNo, ScalarSize, static_cast<unsigned>(LMUL),
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static_cast<unsigned>(RISCVVLMUL::LMUL_1));
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SDNode *Load =
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CurDAG->getMachineNode(P->Pseudo, DL, MVT::Untyped, MVT::Other, Operands);
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SDValue SuperReg = SDValue(Load, 0);
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for (unsigned I = 0; I < NF; ++I)
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ReplaceUses(SDValue(Node, I),
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CurDAG->getTargetExtractSubreg(getSubregIndexByEVT(VT, I), DL,
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VT, SuperReg));
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ReplaceUses(SDValue(Node, NF), SDValue(Load, 1));
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CurDAG->RemoveDeadNode(Node);
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}
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void RISCVDAGToDAGISel::selectVLSEGMask(SDNode *Node, unsigned IntNo,
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bool IsStrided) {
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SDLoc DL(Node);
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unsigned NF = Node->getNumValues() - 1;
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EVT VT = Node->getValueType(0);
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unsigned ScalarSize = VT.getScalarSizeInBits();
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MVT XLenVT = Subtarget->getXLenVT();
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RISCVVLMUL LMUL = getLMUL(VT);
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SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
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SmallVector<SDValue, 8> Regs(Node->op_begin() + 2, Node->op_begin() + 2 + NF);
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SDValue MaskedOff = createTuple(*CurDAG, Regs, NF, LMUL);
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SmallVector<SDValue, 7> Operands;
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Operands.push_back(MaskedOff);
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Operands.push_back(Node->getOperand(NF + 2)); // Base pointer.
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if (IsStrided) {
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Operands.push_back(Node->getOperand(NF + 3)); // Stride.
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Operands.push_back(Node->getOperand(NF + 4)); // Mask.
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Operands.push_back(Node->getOperand(NF + 5)); // VL.
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} else {
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Operands.push_back(Node->getOperand(NF + 3)); // Mask.
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Operands.push_back(Node->getOperand(NF + 4)); // VL.
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}
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Operands.push_back(SEW);
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Operands.push_back(Node->getOperand(0)); /// Chain.
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const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
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IntNo, ScalarSize, static_cast<unsigned>(LMUL),
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static_cast<unsigned>(RISCVVLMUL::LMUL_1));
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SDNode *Load =
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CurDAG->getMachineNode(P->Pseudo, DL, MVT::Untyped, MVT::Other, Operands);
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SDValue SuperReg = SDValue(Load, 0);
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for (unsigned I = 0; I < NF; ++I)
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ReplaceUses(SDValue(Node, I),
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CurDAG->getTargetExtractSubreg(getSubregIndexByEVT(VT, I), DL,
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VT, SuperReg));
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ReplaceUses(SDValue(Node, NF), SDValue(Load, 1));
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CurDAG->RemoveDeadNode(Node);
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}
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void RISCVDAGToDAGISel::selectVLSEGFF(SDNode *Node) {
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SDLoc DL(Node);
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unsigned IntNo = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
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unsigned NF = Node->getNumValues() - 2; // Do not count Chain and Glue.
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EVT VT = Node->getValueType(0);
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unsigned ScalarSize = VT.getScalarSizeInBits();
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MVT XLenVT = Subtarget->getXLenVT();
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RISCVVLMUL LMUL = getLMUL(VT);
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SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
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SmallVector<SDValue, 5> Operands;
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Operands.push_back(Node->getOperand(2)); // Base pointer.
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Operands.push_back(Node->getOperand(3)); // VL.
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Operands.push_back(SEW);
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Operands.push_back(Node->getOperand(0)); // Chain.
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const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
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IntNo, ScalarSize, static_cast<unsigned>(LMUL),
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static_cast<unsigned>(RISCVVLMUL::LMUL_1));
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SDNode *Load = CurDAG->getMachineNode(P->Pseudo, DL, MVT::Untyped, MVT::Other,
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MVT::Glue, Operands);
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SDValue SuperReg = SDValue(Load, 0);
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for (unsigned I = 0; I < NF; ++I)
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ReplaceUses(SDValue(Node, I),
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CurDAG->getTargetExtractSubreg(getSubregIndexByEVT(VT, I), DL,
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VT, SuperReg));
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ReplaceUses(SDValue(Node, NF), SDValue(Load, 1)); // Chain.
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ReplaceUses(SDValue(Node, NF + 1), SDValue(Load, 2)); // Glue.
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CurDAG->RemoveDeadNode(Node);
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}
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void RISCVDAGToDAGISel::selectVLSEGFFMask(SDNode *Node) {
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SDLoc DL(Node);
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unsigned IntNo = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
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unsigned NF = Node->getNumValues() - 2; // Do not count Chain and Glue.
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EVT VT = Node->getValueType(0);
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unsigned ScalarSize = VT.getScalarSizeInBits();
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MVT XLenVT = Subtarget->getXLenVT();
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RISCVVLMUL LMUL = getLMUL(VT);
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SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
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SmallVector<SDValue, 8> Regs(Node->op_begin() + 2, Node->op_begin() + 2 + NF);
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SDValue MaskedOff = createTuple(*CurDAG, Regs, NF, LMUL);
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SmallVector<SDValue, 7> Operands;
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Operands.push_back(MaskedOff);
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Operands.push_back(Node->getOperand(NF + 2)); // Base pointer.
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Operands.push_back(Node->getOperand(NF + 3)); // Mask.
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Operands.push_back(Node->getOperand(NF + 4)); // VL.
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Operands.push_back(SEW);
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Operands.push_back(Node->getOperand(0)); /// Chain.
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const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
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IntNo, ScalarSize, static_cast<unsigned>(LMUL),
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static_cast<unsigned>(RISCVVLMUL::LMUL_1));
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SDNode *Load = CurDAG->getMachineNode(P->Pseudo, DL, MVT::Untyped, MVT::Other,
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MVT::Glue, Operands);
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SDValue SuperReg = SDValue(Load, 0);
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for (unsigned I = 0; I < NF; ++I)
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ReplaceUses(SDValue(Node, I),
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CurDAG->getTargetExtractSubreg(getSubregIndexByEVT(VT, I), DL,
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VT, SuperReg));
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ReplaceUses(SDValue(Node, NF), SDValue(Load, 1)); // Chain.
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ReplaceUses(SDValue(Node, NF + 1), SDValue(Load, 2)); // Glue.
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CurDAG->RemoveDeadNode(Node);
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}
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void RISCVDAGToDAGISel::selectVLXSEG(SDNode *Node, unsigned IntNo) {
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SDLoc DL(Node);
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unsigned NF = Node->getNumValues() - 1;
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EVT VT = Node->getValueType(0);
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unsigned ScalarSize = VT.getScalarSizeInBits();
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MVT XLenVT = Subtarget->getXLenVT();
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RISCVVLMUL LMUL = getLMUL(VT);
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SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
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SDValue Operands[] = {
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Node->getOperand(2), // Base pointer.
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Node->getOperand(3), // Index.
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Node->getOperand(4), // VL.
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SEW, Node->getOperand(0) // Chain.
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};
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EVT IndexVT = Node->getOperand(3)->getValueType(0);
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RISCVVLMUL IndexLMUL = getLMUL(IndexVT);
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unsigned IndexScalarSize = IndexVT.getScalarSizeInBits();
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const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
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IntNo, IndexScalarSize, static_cast<unsigned>(LMUL),
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static_cast<unsigned>(IndexLMUL));
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SDNode *Load =
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CurDAG->getMachineNode(P->Pseudo, DL, MVT::Untyped, MVT::Other, Operands);
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SDValue SuperReg = SDValue(Load, 0);
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for (unsigned I = 0; I < NF; ++I)
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ReplaceUses(SDValue(Node, I),
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CurDAG->getTargetExtractSubreg(getSubregIndexByEVT(VT, I), DL,
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VT, SuperReg));
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ReplaceUses(SDValue(Node, NF), SDValue(Load, 1));
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CurDAG->RemoveDeadNode(Node);
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}
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void RISCVDAGToDAGISel::selectVLXSEGMask(SDNode *Node, unsigned IntNo) {
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SDLoc DL(Node);
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unsigned NF = Node->getNumValues() - 1;
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EVT VT = Node->getValueType(0);
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unsigned ScalarSize = VT.getScalarSizeInBits();
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MVT XLenVT = Subtarget->getXLenVT();
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RISCVVLMUL LMUL = getLMUL(VT);
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SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
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SmallVector<SDValue, 8> Regs(Node->op_begin() + 2, Node->op_begin() + 2 + NF);
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SDValue MaskedOff = createTuple(*CurDAG, Regs, NF, LMUL);
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SDValue Operands[] = {
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MaskedOff,
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Node->getOperand(NF + 2), // Base pointer.
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Node->getOperand(NF + 3), // Index.
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Node->getOperand(NF + 4), // Mask.
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Node->getOperand(NF + 5), // VL.
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SEW,
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Node->getOperand(0) // Chain.
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};
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EVT IndexVT = Node->getOperand(NF + 3)->getValueType(0);
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RISCVVLMUL IndexLMUL = getLMUL(IndexVT);
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unsigned IndexScalarSize = IndexVT.getScalarSizeInBits();
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const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
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IntNo, IndexScalarSize, static_cast<unsigned>(LMUL),
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static_cast<unsigned>(IndexLMUL));
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SDNode *Load =
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CurDAG->getMachineNode(P->Pseudo, DL, MVT::Untyped, MVT::Other, Operands);
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SDValue SuperReg = SDValue(Load, 0);
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for (unsigned I = 0; I < NF; ++I)
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ReplaceUses(SDValue(Node, I),
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CurDAG->getTargetExtractSubreg(getSubregIndexByEVT(VT, I), DL,
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VT, SuperReg));
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ReplaceUses(SDValue(Node, NF), SDValue(Load, 1));
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CurDAG->RemoveDeadNode(Node);
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}
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void RISCVDAGToDAGISel::selectVSSEG(SDNode *Node, unsigned IntNo,
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bool IsStrided) {
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SDLoc DL(Node);
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unsigned NF = Node->getNumOperands() - 4;
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if (IsStrided)
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NF--;
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EVT VT = Node->getOperand(2)->getValueType(0);
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unsigned ScalarSize = VT.getScalarSizeInBits();
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MVT XLenVT = Subtarget->getXLenVT();
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RISCVVLMUL LMUL = getLMUL(VT);
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SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
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SmallVector<SDValue, 8> Regs(Node->op_begin() + 2, Node->op_begin() + 2 + NF);
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SDValue StoreVal = createTuple(*CurDAG, Regs, NF, LMUL);
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SmallVector<SDValue, 6> Operands;
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Operands.push_back(StoreVal);
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Operands.push_back(Node->getOperand(2 + NF)); // Base pointer.
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if (IsStrided) {
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Operands.push_back(Node->getOperand(3 + NF)); // Stride.
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Operands.push_back(Node->getOperand(4 + NF)); // VL.
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} else {
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Operands.push_back(Node->getOperand(3 + NF)); // VL.
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}
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Operands.push_back(SEW);
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Operands.push_back(Node->getOperand(0)); // Chain.
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const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
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IntNo, ScalarSize, static_cast<unsigned>(LMUL),
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static_cast<unsigned>(RISCVVLMUL::LMUL_1));
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SDNode *Store =
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CurDAG->getMachineNode(P->Pseudo, DL, Node->getValueType(0), Operands);
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ReplaceNode(Node, Store);
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}
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void RISCVDAGToDAGISel::selectVSSEGMask(SDNode *Node, unsigned IntNo,
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|
bool IsStrided) {
|
|
SDLoc DL(Node);
|
|
unsigned NF = Node->getNumOperands() - 5;
|
|
if (IsStrided)
|
|
NF--;
|
|
EVT VT = Node->getOperand(2)->getValueType(0);
|
|
unsigned ScalarSize = VT.getScalarSizeInBits();
|
|
MVT XLenVT = Subtarget->getXLenVT();
|
|
RISCVVLMUL LMUL = getLMUL(VT);
|
|
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
|
|
SmallVector<SDValue, 8> Regs(Node->op_begin() + 2, Node->op_begin() + 2 + NF);
|
|
SDValue StoreVal = createTuple(*CurDAG, Regs, NF, LMUL);
|
|
SmallVector<SDValue, 7> Operands;
|
|
Operands.push_back(StoreVal);
|
|
Operands.push_back(Node->getOperand(2 + NF)); // Base pointer.
|
|
if (IsStrided) {
|
|
Operands.push_back(Node->getOperand(3 + NF)); // Stride.
|
|
Operands.push_back(Node->getOperand(4 + NF)); // Mask.
|
|
Operands.push_back(Node->getOperand(5 + NF)); // VL.
|
|
} else {
|
|
Operands.push_back(Node->getOperand(3 + NF)); // Mask.
|
|
Operands.push_back(Node->getOperand(4 + NF)); // VL.
|
|
}
|
|
Operands.push_back(SEW);
|
|
Operands.push_back(Node->getOperand(0)); // Chain.
|
|
const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
|
|
IntNo, ScalarSize, static_cast<unsigned>(LMUL),
|
|
static_cast<unsigned>(RISCVVLMUL::LMUL_1));
|
|
SDNode *Store =
|
|
CurDAG->getMachineNode(P->Pseudo, DL, Node->getValueType(0), Operands);
|
|
ReplaceNode(Node, Store);
|
|
}
|
|
|
|
void RISCVDAGToDAGISel::selectVSXSEG(SDNode *Node, unsigned IntNo) {
|
|
SDLoc DL(Node);
|
|
unsigned NF = Node->getNumOperands() - 5;
|
|
EVT VT = Node->getOperand(2)->getValueType(0);
|
|
unsigned ScalarSize = VT.getScalarSizeInBits();
|
|
MVT XLenVT = Subtarget->getXLenVT();
|
|
RISCVVLMUL LMUL = getLMUL(VT);
|
|
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
|
|
SmallVector<SDValue, 8> Regs(Node->op_begin() + 2, Node->op_begin() + 2 + NF);
|
|
SDValue StoreVal = createTuple(*CurDAG, Regs, NF, LMUL);
|
|
SDValue Operands[] = {
|
|
StoreVal,
|
|
Node->getOperand(2 + NF), // Base pointer.
|
|
Node->getOperand(3 + NF), // Index.
|
|
Node->getOperand(4 + NF), // VL.
|
|
SEW,
|
|
Node->getOperand(0) // Chain.
|
|
};
|
|
|
|
EVT IndexVT = Node->getOperand(3 + NF)->getValueType(0);
|
|
RISCVVLMUL IndexLMUL = getLMUL(IndexVT);
|
|
unsigned IndexScalarSize = IndexVT.getScalarSizeInBits();
|
|
const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
|
|
IntNo, IndexScalarSize, static_cast<unsigned>(LMUL),
|
|
static_cast<unsigned>(IndexLMUL));
|
|
SDNode *Store =
|
|
CurDAG->getMachineNode(P->Pseudo, DL, Node->getValueType(0), Operands);
|
|
ReplaceNode(Node, Store);
|
|
}
|
|
|
|
void RISCVDAGToDAGISel::selectVSXSEGMask(SDNode *Node, unsigned IntNo) {
|
|
SDLoc DL(Node);
|
|
unsigned NF = Node->getNumOperands() - 6;
|
|
EVT VT = Node->getOperand(2)->getValueType(0);
|
|
unsigned ScalarSize = VT.getScalarSizeInBits();
|
|
MVT XLenVT = Subtarget->getXLenVT();
|
|
RISCVVLMUL LMUL = getLMUL(VT);
|
|
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
|
|
SmallVector<SDValue, 8> Regs(Node->op_begin() + 2, Node->op_begin() + 2 + NF);
|
|
SDValue StoreVal = createTuple(*CurDAG, Regs, NF, LMUL);
|
|
SDValue Operands[] = {
|
|
StoreVal,
|
|
Node->getOperand(2 + NF), // Base pointer.
|
|
Node->getOperand(3 + NF), // Index.
|
|
Node->getOperand(4 + NF), // Mask.
|
|
Node->getOperand(5 + NF), // VL.
|
|
SEW,
|
|
Node->getOperand(0) // Chain.
|
|
};
|
|
|
|
EVT IndexVT = Node->getOperand(3 + NF)->getValueType(0);
|
|
RISCVVLMUL IndexLMUL = getLMUL(IndexVT);
|
|
unsigned IndexScalarSize = IndexVT.getScalarSizeInBits();
|
|
const RISCVZvlssegTable::RISCVZvlsseg *P = RISCVZvlssegTable::getPseudo(
|
|
IntNo, IndexScalarSize, static_cast<unsigned>(LMUL),
|
|
static_cast<unsigned>(IndexLMUL));
|
|
SDNode *Store =
|
|
CurDAG->getMachineNode(P->Pseudo, DL, Node->getValueType(0), Operands);
|
|
ReplaceNode(Node, Store);
|
|
}
|
|
|
|
void RISCVDAGToDAGISel::Select(SDNode *Node) {
|
|
// If we have a custom node, we have already selected.
|
|
if (Node->isMachineOpcode()) {
|
|
LLVM_DEBUG(dbgs() << "== "; Node->dump(CurDAG); dbgs() << "\n");
|
|
Node->setNodeId(-1);
|
|
return;
|
|
}
|
|
|
|
// Instruction Selection not handled by the auto-generated tablegen selection
|
|
// should be handled here.
|
|
unsigned Opcode = Node->getOpcode();
|
|
MVT XLenVT = Subtarget->getXLenVT();
|
|
SDLoc DL(Node);
|
|
EVT VT = Node->getValueType(0);
|
|
|
|
switch (Opcode) {
|
|
case ISD::ADD: {
|
|
// Optimize (add r, imm) to (addi (addi r, imm0) imm1) if applicable. The
|
|
// immediate must be in specific ranges and have a single use.
|
|
if (auto *ConstOp = dyn_cast<ConstantSDNode>(Node->getOperand(1))) {
|
|
if (!(ConstOp->hasOneUse()))
|
|
break;
|
|
// The imm must be in range [-4096,-2049] or [2048,4094].
|
|
int64_t Imm = ConstOp->getSExtValue();
|
|
if (!(-4096 <= Imm && Imm <= -2049) && !(2048 <= Imm && Imm <= 4094))
|
|
break;
|
|
// Break the imm to imm0+imm1.
|
|
EVT VT = Node->getValueType(0);
|
|
const SDValue ImmOp0 = CurDAG->getTargetConstant(Imm - Imm / 2, DL, VT);
|
|
const SDValue ImmOp1 = CurDAG->getTargetConstant(Imm / 2, DL, VT);
|
|
auto *NodeAddi0 = CurDAG->getMachineNode(RISCV::ADDI, DL, VT,
|
|
Node->getOperand(0), ImmOp0);
|
|
auto *NodeAddi1 = CurDAG->getMachineNode(RISCV::ADDI, DL, VT,
|
|
SDValue(NodeAddi0, 0), ImmOp1);
|
|
ReplaceNode(Node, NodeAddi1);
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
case ISD::Constant: {
|
|
auto ConstNode = cast<ConstantSDNode>(Node);
|
|
if (VT == XLenVT && ConstNode->isNullValue()) {
|
|
SDValue New =
|
|
CurDAG->getCopyFromReg(CurDAG->getEntryNode(), DL, RISCV::X0, XLenVT);
|
|
ReplaceNode(Node, New.getNode());
|
|
return;
|
|
}
|
|
int64_t Imm = ConstNode->getSExtValue();
|
|
if (XLenVT == MVT::i64) {
|
|
ReplaceNode(Node, selectImm(CurDAG, DL, Imm, XLenVT));
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
case ISD::FrameIndex: {
|
|
SDValue Imm = CurDAG->getTargetConstant(0, DL, XLenVT);
|
|
int FI = cast<FrameIndexSDNode>(Node)->getIndex();
|
|
SDValue TFI = CurDAG->getTargetFrameIndex(FI, VT);
|
|
ReplaceNode(Node, CurDAG->getMachineNode(RISCV::ADDI, DL, VT, TFI, Imm));
|
|
return;
|
|
}
|
|
case ISD::INTRINSIC_W_CHAIN: {
|
|
unsigned IntNo = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
|
|
switch (IntNo) {
|
|
// By default we do not custom select any intrinsic.
|
|
default:
|
|
break;
|
|
|
|
case Intrinsic::riscv_vsetvli: {
|
|
if (!Subtarget->hasStdExtV())
|
|
break;
|
|
|
|
assert(Node->getNumOperands() == 5);
|
|
|
|
RISCVVSEW VSEW =
|
|
static_cast<RISCVVSEW>(Node->getConstantOperandVal(3) & 0x7);
|
|
RISCVVLMUL VLMul =
|
|
static_cast<RISCVVLMUL>(Node->getConstantOperandVal(4) & 0x7);
|
|
|
|
unsigned VTypeI = RISCVVType::encodeVTYPE(
|
|
VLMul, VSEW, /*TailAgnostic*/ true, /*MaskAgnostic*/ false);
|
|
SDValue VTypeIOp = CurDAG->getTargetConstant(VTypeI, DL, XLenVT);
|
|
|
|
SDValue VLOperand = Node->getOperand(2);
|
|
if (auto *C = dyn_cast<ConstantSDNode>(VLOperand)) {
|
|
uint64_t AVL = C->getZExtValue();
|
|
if (isUInt<5>(AVL)) {
|
|
SDValue VLImm = CurDAG->getTargetConstant(AVL, DL, XLenVT);
|
|
ReplaceNode(Node,
|
|
CurDAG->getMachineNode(RISCV::PseudoVSETIVLI, DL, XLenVT,
|
|
MVT::Other, VLImm, VTypeIOp,
|
|
/* Chain */ Node->getOperand(0)));
|
|
return;
|
|
}
|
|
}
|
|
|
|
ReplaceNode(Node,
|
|
CurDAG->getMachineNode(RISCV::PseudoVSETVLI, DL, XLenVT,
|
|
MVT::Other, VLOperand, VTypeIOp,
|
|
/* Chain */ Node->getOperand(0)));
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vsetvlimax: {
|
|
if (!Subtarget->hasStdExtV())
|
|
break;
|
|
|
|
assert(Node->getNumOperands() == 4);
|
|
|
|
RISCVVSEW VSEW =
|
|
static_cast<RISCVVSEW>(Node->getConstantOperandVal(2) & 0x7);
|
|
RISCVVLMUL VLMul =
|
|
static_cast<RISCVVLMUL>(Node->getConstantOperandVal(3) & 0x7);
|
|
|
|
unsigned VTypeI = RISCVVType::encodeVTYPE(
|
|
VLMul, VSEW, /*TailAgnostic*/ true, /*MaskAgnostic*/ false);
|
|
SDValue VTypeIOp = CurDAG->getTargetConstant(VTypeI, DL, XLenVT);
|
|
|
|
SDValue VLOperand = CurDAG->getRegister(RISCV::X0, XLenVT);
|
|
ReplaceNode(Node,
|
|
CurDAG->getMachineNode(RISCV::PseudoVSETVLI, DL, XLenVT,
|
|
MVT::Other, VLOperand, VTypeIOp,
|
|
/* Chain */ Node->getOperand(0)));
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vlseg2:
|
|
case Intrinsic::riscv_vlseg3:
|
|
case Intrinsic::riscv_vlseg4:
|
|
case Intrinsic::riscv_vlseg5:
|
|
case Intrinsic::riscv_vlseg6:
|
|
case Intrinsic::riscv_vlseg7:
|
|
case Intrinsic::riscv_vlseg8: {
|
|
selectVLSEG(Node, IntNo, /*IsStrided=*/false);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vlseg2_mask:
|
|
case Intrinsic::riscv_vlseg3_mask:
|
|
case Intrinsic::riscv_vlseg4_mask:
|
|
case Intrinsic::riscv_vlseg5_mask:
|
|
case Intrinsic::riscv_vlseg6_mask:
|
|
case Intrinsic::riscv_vlseg7_mask:
|
|
case Intrinsic::riscv_vlseg8_mask: {
|
|
selectVLSEGMask(Node, IntNo, /*IsStrided=*/false);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vlsseg2:
|
|
case Intrinsic::riscv_vlsseg3:
|
|
case Intrinsic::riscv_vlsseg4:
|
|
case Intrinsic::riscv_vlsseg5:
|
|
case Intrinsic::riscv_vlsseg6:
|
|
case Intrinsic::riscv_vlsseg7:
|
|
case Intrinsic::riscv_vlsseg8: {
|
|
selectVLSEG(Node, IntNo, /*IsStrided=*/true);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vlsseg2_mask:
|
|
case Intrinsic::riscv_vlsseg3_mask:
|
|
case Intrinsic::riscv_vlsseg4_mask:
|
|
case Intrinsic::riscv_vlsseg5_mask:
|
|
case Intrinsic::riscv_vlsseg6_mask:
|
|
case Intrinsic::riscv_vlsseg7_mask:
|
|
case Intrinsic::riscv_vlsseg8_mask: {
|
|
selectVLSEGMask(Node, IntNo, /*IsStrided=*/true);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vloxseg2:
|
|
case Intrinsic::riscv_vloxseg3:
|
|
case Intrinsic::riscv_vloxseg4:
|
|
case Intrinsic::riscv_vloxseg5:
|
|
case Intrinsic::riscv_vloxseg6:
|
|
case Intrinsic::riscv_vloxseg7:
|
|
case Intrinsic::riscv_vloxseg8:
|
|
case Intrinsic::riscv_vluxseg2:
|
|
case Intrinsic::riscv_vluxseg3:
|
|
case Intrinsic::riscv_vluxseg4:
|
|
case Intrinsic::riscv_vluxseg5:
|
|
case Intrinsic::riscv_vluxseg6:
|
|
case Intrinsic::riscv_vluxseg7:
|
|
case Intrinsic::riscv_vluxseg8: {
|
|
selectVLXSEG(Node, IntNo);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vloxseg2_mask:
|
|
case Intrinsic::riscv_vloxseg3_mask:
|
|
case Intrinsic::riscv_vloxseg4_mask:
|
|
case Intrinsic::riscv_vloxseg5_mask:
|
|
case Intrinsic::riscv_vloxseg6_mask:
|
|
case Intrinsic::riscv_vloxseg7_mask:
|
|
case Intrinsic::riscv_vloxseg8_mask:
|
|
case Intrinsic::riscv_vluxseg2_mask:
|
|
case Intrinsic::riscv_vluxseg3_mask:
|
|
case Intrinsic::riscv_vluxseg4_mask:
|
|
case Intrinsic::riscv_vluxseg5_mask:
|
|
case Intrinsic::riscv_vluxseg6_mask:
|
|
case Intrinsic::riscv_vluxseg7_mask:
|
|
case Intrinsic::riscv_vluxseg8_mask: {
|
|
selectVLXSEGMask(Node, IntNo);
|
|
return;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case ISD::INTRINSIC_VOID: {
|
|
unsigned IntNo = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
|
|
switch (IntNo) {
|
|
case Intrinsic::riscv_vsseg2:
|
|
case Intrinsic::riscv_vsseg3:
|
|
case Intrinsic::riscv_vsseg4:
|
|
case Intrinsic::riscv_vsseg5:
|
|
case Intrinsic::riscv_vsseg6:
|
|
case Intrinsic::riscv_vsseg7:
|
|
case Intrinsic::riscv_vsseg8: {
|
|
selectVSSEG(Node, IntNo, /*IsStrided=*/false);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vsseg2_mask:
|
|
case Intrinsic::riscv_vsseg3_mask:
|
|
case Intrinsic::riscv_vsseg4_mask:
|
|
case Intrinsic::riscv_vsseg5_mask:
|
|
case Intrinsic::riscv_vsseg6_mask:
|
|
case Intrinsic::riscv_vsseg7_mask:
|
|
case Intrinsic::riscv_vsseg8_mask: {
|
|
selectVSSEGMask(Node, IntNo, /*IsStrided=*/false);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vssseg2:
|
|
case Intrinsic::riscv_vssseg3:
|
|
case Intrinsic::riscv_vssseg4:
|
|
case Intrinsic::riscv_vssseg5:
|
|
case Intrinsic::riscv_vssseg6:
|
|
case Intrinsic::riscv_vssseg7:
|
|
case Intrinsic::riscv_vssseg8: {
|
|
selectVSSEG(Node, IntNo, /*IsStrided=*/true);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vssseg2_mask:
|
|
case Intrinsic::riscv_vssseg3_mask:
|
|
case Intrinsic::riscv_vssseg4_mask:
|
|
case Intrinsic::riscv_vssseg5_mask:
|
|
case Intrinsic::riscv_vssseg6_mask:
|
|
case Intrinsic::riscv_vssseg7_mask:
|
|
case Intrinsic::riscv_vssseg8_mask: {
|
|
selectVSSEGMask(Node, IntNo, /*IsStrided=*/true);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vsoxseg2:
|
|
case Intrinsic::riscv_vsoxseg3:
|
|
case Intrinsic::riscv_vsoxseg4:
|
|
case Intrinsic::riscv_vsoxseg5:
|
|
case Intrinsic::riscv_vsoxseg6:
|
|
case Intrinsic::riscv_vsoxseg7:
|
|
case Intrinsic::riscv_vsoxseg8:
|
|
case Intrinsic::riscv_vsuxseg2:
|
|
case Intrinsic::riscv_vsuxseg3:
|
|
case Intrinsic::riscv_vsuxseg4:
|
|
case Intrinsic::riscv_vsuxseg5:
|
|
case Intrinsic::riscv_vsuxseg6:
|
|
case Intrinsic::riscv_vsuxseg7:
|
|
case Intrinsic::riscv_vsuxseg8: {
|
|
selectVSXSEG(Node, IntNo);
|
|
return;
|
|
}
|
|
case Intrinsic::riscv_vsoxseg2_mask:
|
|
case Intrinsic::riscv_vsoxseg3_mask:
|
|
case Intrinsic::riscv_vsoxseg4_mask:
|
|
case Intrinsic::riscv_vsoxseg5_mask:
|
|
case Intrinsic::riscv_vsoxseg6_mask:
|
|
case Intrinsic::riscv_vsoxseg7_mask:
|
|
case Intrinsic::riscv_vsoxseg8_mask:
|
|
case Intrinsic::riscv_vsuxseg2_mask:
|
|
case Intrinsic::riscv_vsuxseg3_mask:
|
|
case Intrinsic::riscv_vsuxseg4_mask:
|
|
case Intrinsic::riscv_vsuxseg5_mask:
|
|
case Intrinsic::riscv_vsuxseg6_mask:
|
|
case Intrinsic::riscv_vsuxseg7_mask:
|
|
case Intrinsic::riscv_vsuxseg8_mask: {
|
|
selectVSXSEGMask(Node, IntNo);
|
|
return;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case RISCVISD::VLSEGFF: {
|
|
selectVLSEGFF(Node);
|
|
return;
|
|
}
|
|
case RISCVISD::VLSEGFF_MASK: {
|
|
selectVLSEGFFMask(Node);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Select the default instruction.
|
|
SelectCode(Node);
|
|
}
|
|
|
|
bool RISCVDAGToDAGISel::SelectInlineAsmMemoryOperand(
|
|
const SDValue &Op, unsigned ConstraintID, std::vector<SDValue> &OutOps) {
|
|
switch (ConstraintID) {
|
|
case InlineAsm::Constraint_m:
|
|
// We just support simple memory operands that have a single address
|
|
// operand and need no special handling.
|
|
OutOps.push_back(Op);
|
|
return false;
|
|
case InlineAsm::Constraint_A:
|
|
OutOps.push_back(Op);
|
|
return false;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool RISCVDAGToDAGISel::SelectAddrFI(SDValue Addr, SDValue &Base) {
|
|
if (auto FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
|
|
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), Subtarget->getXLenVT());
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Match (srl (and val, mask), imm) where the result would be a
|
|
// zero-extended 32-bit integer. i.e. the mask is 0xffffffff or the result
|
|
// is equivalent to this (SimplifyDemandedBits may have removed lower bits
|
|
// from the mask that aren't necessary due to the right-shifting).
|
|
bool RISCVDAGToDAGISel::MatchSRLIW(SDNode *N) const {
|
|
assert(N->getOpcode() == ISD::SRL);
|
|
assert(N->getOperand(0).getOpcode() == ISD::AND);
|
|
assert(isa<ConstantSDNode>(N->getOperand(1)));
|
|
assert(isa<ConstantSDNode>(N->getOperand(0).getOperand(1)));
|
|
|
|
// The IsRV64 predicate is checked after PatFrag predicates so we can get
|
|
// here even on RV32.
|
|
if (!Subtarget->is64Bit())
|
|
return false;
|
|
|
|
SDValue And = N->getOperand(0);
|
|
uint64_t ShAmt = N->getConstantOperandVal(1);
|
|
uint64_t Mask = And.getConstantOperandVal(1);
|
|
return (Mask | maskTrailingOnes<uint64_t>(ShAmt)) == 0xffffffff;
|
|
}
|
|
|
|
// Check that it is a SLLIUW (Shift Logical Left Immediate Unsigned i32
|
|
// on RV64).
|
|
// SLLIUW is the same as SLLI except for the fact that it clears the bits
|
|
// XLEN-1:32 of the input RS1 before shifting.
|
|
// A PatFrag has already checked that it has the right structure:
|
|
//
|
|
// (AND (SHL RS1, VC2), VC1)
|
|
//
|
|
// We check that VC2, the shamt is less than 32, otherwise the pattern is
|
|
// exactly the same as SLLI and we give priority to that.
|
|
// Eventually we check that VC1, the mask used to clear the upper 32 bits
|
|
// of RS1, is correct:
|
|
//
|
|
// VC1 == (0xFFFFFFFF << VC2)
|
|
//
|
|
bool RISCVDAGToDAGISel::MatchSLLIUW(SDNode *N) const {
|
|
assert(N->getOpcode() == ISD::AND);
|
|
assert(N->getOperand(0).getOpcode() == ISD::SHL);
|
|
assert(isa<ConstantSDNode>(N->getOperand(1)));
|
|
assert(isa<ConstantSDNode>(N->getOperand(0).getOperand(1)));
|
|
|
|
// The IsRV64 predicate is checked after PatFrag predicates so we can get
|
|
// here even on RV32.
|
|
if (!Subtarget->is64Bit())
|
|
return false;
|
|
|
|
SDValue Shl = N->getOperand(0);
|
|
uint64_t VC1 = N->getConstantOperandVal(1);
|
|
uint64_t VC2 = Shl.getConstantOperandVal(1);
|
|
|
|
// Immediate range should be enforced by uimm5 predicate.
|
|
assert(VC2 < 32 && "Unexpected immediate");
|
|
return (VC1 >> VC2) == UINT64_C(0xFFFFFFFF);
|
|
}
|
|
|
|
// X0 has special meaning for vsetvl/vsetvli.
|
|
// rd | rs1 | AVL value | Effect on vl
|
|
//--------------------------------------------------------------
|
|
// !X0 | X0 | VLMAX | Set vl to VLMAX
|
|
// X0 | X0 | Value in vl | Keep current vl, just change vtype.
|
|
bool RISCVDAGToDAGISel::selectVLOp(SDValue N, SDValue &VL) {
|
|
// If the VL value is a constant 0, manually select it to an ADDI with 0
|
|
// immediate to prevent the default selection path from matching it to X0.
|
|
auto *C = dyn_cast<ConstantSDNode>(N);
|
|
if (C && C->isNullValue())
|
|
VL = SDValue(selectImm(CurDAG, SDLoc(N), 0, Subtarget->getXLenVT()), 0);
|
|
else
|
|
VL = N;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool RISCVDAGToDAGISel::selectVSplat(SDValue N, SDValue &SplatVal) {
|
|
if (N.getOpcode() != ISD::SPLAT_VECTOR &&
|
|
N.getOpcode() != RISCVISD::SPLAT_VECTOR_I64)
|
|
return false;
|
|
SplatVal = N.getOperand(0);
|
|
return true;
|
|
}
|
|
|
|
bool RISCVDAGToDAGISel::selectVSplatSimm5(SDValue N, SDValue &SplatVal) {
|
|
if ((N.getOpcode() != ISD::SPLAT_VECTOR &&
|
|
N.getOpcode() != RISCVISD::SPLAT_VECTOR_I64) ||
|
|
!isa<ConstantSDNode>(N.getOperand(0)))
|
|
return false;
|
|
|
|
int64_t SplatImm = cast<ConstantSDNode>(N.getOperand(0))->getSExtValue();
|
|
|
|
// Both ISD::SPLAT_VECTOR and RISCVISD::SPLAT_VECTOR_I64 share semantics when
|
|
// the operand type is wider than the resulting vector element type: an
|
|
// implicit truncation first takes place. Therefore, perform a manual
|
|
// truncation/sign-extension in order to ignore any truncated bits and catch
|
|
// any zero-extended immediate.
|
|
// For example, we wish to match (i8 -1) -> (XLenVT 255) as a simm5 by first
|
|
// sign-extending to (XLenVT -1).
|
|
auto XLenVT = Subtarget->getXLenVT();
|
|
assert(XLenVT == N.getOperand(0).getSimpleValueType() &&
|
|
"Unexpected splat operand type");
|
|
auto EltVT = N.getValueType().getVectorElementType();
|
|
if (EltVT.bitsLT(XLenVT)) {
|
|
SplatImm = SignExtend64(SplatImm, EltVT.getSizeInBits());
|
|
}
|
|
|
|
if (!isInt<5>(SplatImm))
|
|
return false;
|
|
|
|
SplatVal = CurDAG->getTargetConstant(SplatImm, SDLoc(N), XLenVT);
|
|
return true;
|
|
}
|
|
|
|
bool RISCVDAGToDAGISel::selectVSplatUimm5(SDValue N, SDValue &SplatVal) {
|
|
if ((N.getOpcode() != ISD::SPLAT_VECTOR &&
|
|
N.getOpcode() != RISCVISD::SPLAT_VECTOR_I64) ||
|
|
!isa<ConstantSDNode>(N.getOperand(0)))
|
|
return false;
|
|
|
|
int64_t SplatImm = cast<ConstantSDNode>(N.getOperand(0))->getSExtValue();
|
|
|
|
if (!isUInt<5>(SplatImm))
|
|
return false;
|
|
|
|
SplatVal =
|
|
CurDAG->getTargetConstant(SplatImm, SDLoc(N), Subtarget->getXLenVT());
|
|
|
|
return true;
|
|
}
|
|
|
|
// Merge an ADDI into the offset of a load/store instruction where possible.
|
|
// (load (addi base, off1), off2) -> (load base, off1+off2)
|
|
// (store val, (addi base, off1), off2) -> (store val, base, off1+off2)
|
|
// This is possible when off1+off2 fits a 12-bit immediate.
|
|
void RISCVDAGToDAGISel::doPeepholeLoadStoreADDI() {
|
|
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
|
|
++Position;
|
|
|
|
while (Position != CurDAG->allnodes_begin()) {
|
|
SDNode *N = &*--Position;
|
|
// Skip dead nodes and any non-machine opcodes.
|
|
if (N->use_empty() || !N->isMachineOpcode())
|
|
continue;
|
|
|
|
int OffsetOpIdx;
|
|
int BaseOpIdx;
|
|
|
|
// Only attempt this optimisation for I-type loads and S-type stores.
|
|
switch (N->getMachineOpcode()) {
|
|
default:
|
|
continue;
|
|
case RISCV::LB:
|
|
case RISCV::LH:
|
|
case RISCV::LW:
|
|
case RISCV::LBU:
|
|
case RISCV::LHU:
|
|
case RISCV::LWU:
|
|
case RISCV::LD:
|
|
case RISCV::FLH:
|
|
case RISCV::FLW:
|
|
case RISCV::FLD:
|
|
BaseOpIdx = 0;
|
|
OffsetOpIdx = 1;
|
|
break;
|
|
case RISCV::SB:
|
|
case RISCV::SH:
|
|
case RISCV::SW:
|
|
case RISCV::SD:
|
|
case RISCV::FSH:
|
|
case RISCV::FSW:
|
|
case RISCV::FSD:
|
|
BaseOpIdx = 1;
|
|
OffsetOpIdx = 2;
|
|
break;
|
|
}
|
|
|
|
if (!isa<ConstantSDNode>(N->getOperand(OffsetOpIdx)))
|
|
continue;
|
|
|
|
SDValue Base = N->getOperand(BaseOpIdx);
|
|
|
|
// If the base is an ADDI, we can merge it in to the load/store.
|
|
if (!Base.isMachineOpcode() || Base.getMachineOpcode() != RISCV::ADDI)
|
|
continue;
|
|
|
|
SDValue ImmOperand = Base.getOperand(1);
|
|
uint64_t Offset2 = N->getConstantOperandVal(OffsetOpIdx);
|
|
|
|
if (auto Const = dyn_cast<ConstantSDNode>(ImmOperand)) {
|
|
int64_t Offset1 = Const->getSExtValue();
|
|
int64_t CombinedOffset = Offset1 + Offset2;
|
|
if (!isInt<12>(CombinedOffset))
|
|
continue;
|
|
ImmOperand = CurDAG->getTargetConstant(CombinedOffset, SDLoc(ImmOperand),
|
|
ImmOperand.getValueType());
|
|
} else if (auto GA = dyn_cast<GlobalAddressSDNode>(ImmOperand)) {
|
|
// If the off1 in (addi base, off1) is a global variable's address (its
|
|
// low part, really), then we can rely on the alignment of that variable
|
|
// to provide a margin of safety before off1 can overflow the 12 bits.
|
|
// Check if off2 falls within that margin; if so off1+off2 can't overflow.
|
|
const DataLayout &DL = CurDAG->getDataLayout();
|
|
Align Alignment = GA->getGlobal()->getPointerAlignment(DL);
|
|
if (Offset2 != 0 && Alignment <= Offset2)
|
|
continue;
|
|
int64_t Offset1 = GA->getOffset();
|
|
int64_t CombinedOffset = Offset1 + Offset2;
|
|
ImmOperand = CurDAG->getTargetGlobalAddress(
|
|
GA->getGlobal(), SDLoc(ImmOperand), ImmOperand.getValueType(),
|
|
CombinedOffset, GA->getTargetFlags());
|
|
} else if (auto CP = dyn_cast<ConstantPoolSDNode>(ImmOperand)) {
|
|
// Ditto.
|
|
Align Alignment = CP->getAlign();
|
|
if (Offset2 != 0 && Alignment <= Offset2)
|
|
continue;
|
|
int64_t Offset1 = CP->getOffset();
|
|
int64_t CombinedOffset = Offset1 + Offset2;
|
|
ImmOperand = CurDAG->getTargetConstantPool(
|
|
CP->getConstVal(), ImmOperand.getValueType(), CP->getAlign(),
|
|
CombinedOffset, CP->getTargetFlags());
|
|
} else {
|
|
continue;
|
|
}
|
|
|
|
LLVM_DEBUG(dbgs() << "Folding add-immediate into mem-op:\nBase: ");
|
|
LLVM_DEBUG(Base->dump(CurDAG));
|
|
LLVM_DEBUG(dbgs() << "\nN: ");
|
|
LLVM_DEBUG(N->dump(CurDAG));
|
|
LLVM_DEBUG(dbgs() << "\n");
|
|
|
|
// Modify the offset operand of the load/store.
|
|
if (BaseOpIdx == 0) // Load
|
|
CurDAG->UpdateNodeOperands(N, Base.getOperand(0), ImmOperand,
|
|
N->getOperand(2));
|
|
else // Store
|
|
CurDAG->UpdateNodeOperands(N, N->getOperand(0), Base.getOperand(0),
|
|
ImmOperand, N->getOperand(3));
|
|
|
|
// The add-immediate may now be dead, in which case remove it.
|
|
if (Base.getNode()->use_empty())
|
|
CurDAG->RemoveDeadNode(Base.getNode());
|
|
}
|
|
}
|
|
|
|
// This pass converts a legalized DAG into a RISCV-specific DAG, ready
|
|
// for instruction scheduling.
|
|
FunctionPass *llvm::createRISCVISelDag(RISCVTargetMachine &TM) {
|
|
return new RISCVDAGToDAGISel(TM);
|
|
}
|