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llvm / llvm-project / llvm / 9c0c7f0975ae3b25aca17067ec2e14a3e9192e76 / . / lib / Target / RISCV / RISCVISelDAGToDAG.cpp
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//===-- RISCVISelDAGToDAG.cpp - A dag to dag inst selector for RISCV ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines an instruction selector for the RISCV target.
//
//===----------------------------------------------------------------------===//
#include "RISCVISelDAGToDAG.h"
#include "MCTargetDesc/RISCVMCTargetDesc.h"
#include "MCTargetDesc/RISCVMatInt.h"
#include "RISCVISelLowering.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/IR/IntrinsicsRISCV.h"
#include "llvm/Support/Alignment.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/KnownBits.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "riscv-isel"
namespace llvm {
namespace RISCV {
#define GET_RISCVVSSEGTable_IMPL
#define GET_RISCVVLSEGTable_IMPL
#define GET_RISCVVLXSEGTable_IMPL
#define GET_RISCVVSXSEGTable_IMPL
#define GET_RISCVVLETable_IMPL
#define GET_RISCVVSETable_IMPL
#define GET_RISCVVLXTable_IMPL
#define GET_RISCVVSXTable_IMPL
#include "RISCVGenSearchableTables.inc"
} // namespace RISCV
} // namespace llvm
void RISCVDAGToDAGISel::PostprocessISelDAG() {
doPeepholeLoadStoreADDI();
}
static SDNode *selectImm(SelectionDAG *CurDAG, const SDLoc &DL, int64_t Imm,
MVT XLenVT) {
RISCVMatInt::InstSeq Seq;
RISCVMatInt::generateInstSeq(Imm, XLenVT == MVT::i64, Seq);
SDNode *Result = nullptr;
SDValue SrcReg = CurDAG->getRegister(RISCV::X0, XLenVT);
for (RISCVMatInt::Inst &Inst : Seq) {
SDValue SDImm = CurDAG->getTargetConstant(Inst.Imm, DL, XLenVT);
if (Inst.Opc == RISCV::LUI)
Result = CurDAG->getMachineNode(RISCV::LUI, DL, XLenVT, SDImm);
else
Result = CurDAG->getMachineNode(Inst.Opc, DL, XLenVT, SrcReg, SDImm);
// Only the first instruction has X0 as its source.
SrcReg = SDValue(Result, 0);
}
return Result;
}
static SDValue createTupleImpl(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
unsigned RegClassID, unsigned SubReg0) {
assert(Regs.size() >= 2 && Regs.size() <= 8);
SDLoc DL(Regs[0]);
SmallVector<SDValue, 8> Ops;
Ops.push_back(CurDAG.getTargetConstant(RegClassID, DL, MVT::i32));
for (unsigned I = 0; I < Regs.size(); ++I) {
Ops.push_back(Regs[I]);
Ops.push_back(CurDAG.getTargetConstant(SubReg0 + I, DL, MVT::i32));
}
SDNode *N =
CurDAG.getMachineNode(TargetOpcode::REG_SEQUENCE, DL, MVT::Untyped, Ops);
return SDValue(N, 0);
}
static SDValue createM1Tuple(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
unsigned NF) {
static const unsigned RegClassIDs[] = {
RISCV::VRN2M1RegClassID, RISCV::VRN3M1RegClassID, RISCV::VRN4M1RegClassID,
RISCV::VRN5M1RegClassID, RISCV::VRN6M1RegClassID, RISCV::VRN7M1RegClassID,
RISCV::VRN8M1RegClassID};
return createTupleImpl(CurDAG, Regs, RegClassIDs[NF - 2], RISCV::sub_vrm1_0);
}
static SDValue createM2Tuple(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
unsigned NF) {
static const unsigned RegClassIDs[] = {RISCV::VRN2M2RegClassID,
RISCV::VRN3M2RegClassID,
RISCV::VRN4M2RegClassID};
return createTupleImpl(CurDAG, Regs, RegClassIDs[NF - 2], RISCV::sub_vrm2_0);
}
static SDValue createM4Tuple(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
unsigned NF) {
return createTupleImpl(CurDAG, Regs, RISCV::VRN2M4RegClassID,
RISCV::sub_vrm4_0);
}
static SDValue createTuple(SelectionDAG &CurDAG, ArrayRef<SDValue> Regs,
unsigned NF, RISCVVLMUL LMUL) {
switch (LMUL) {
default:
llvm_unreachable("Invalid LMUL.");
case RISCVVLMUL::LMUL_F8:
case RISCVVLMUL::LMUL_F4:
case RISCVVLMUL::LMUL_F2:
case RISCVVLMUL::LMUL_1:
return createM1Tuple(CurDAG, Regs, NF);
case RISCVVLMUL::LMUL_2:
return createM2Tuple(CurDAG, Regs, NF);
case RISCVVLMUL::LMUL_4:
return createM4Tuple(CurDAG, Regs, NF);
}
}
void RISCVDAGToDAGISel::selectVLSEG(SDNode *Node, bool IsMasked,
bool IsStrided) {
SDLoc DL(Node);
unsigned NF = Node->getNumValues() - 1;
MVT VT = Node->getSimpleValueType(0);
unsigned ScalarSize = VT.getScalarSizeInBits();
MVT XLenVT = Subtarget->getXLenVT();
RISCVVLMUL LMUL = RISCVTargetLowering::getLMUL(VT);
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
unsigned CurOp = 2;
SmallVector<SDValue, 7> Operands;
if (IsMasked) {
SmallVector<SDValue, 8> Regs(Node->op_begin() + CurOp,
Node->op_begin() + CurOp + NF);
SDValue MaskedOff = createTuple(*CurDAG, Regs, NF, LMUL);
Operands.push_back(MaskedOff);
CurOp += NF;
}
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
if (IsStrided)
Operands.push_back(Node->getOperand(CurOp++)); // Stride.
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
const RISCV::VLSEGPseudo *P =
RISCV::getVLSEGPseudo(NF, IsMasked, IsStrided, /*FF*/ false, ScalarSize,
static_cast<unsigned>(LMUL));
MachineSDNode *Load =
CurDAG->getMachineNode(P->Pseudo, DL, MVT::Untyped, MVT::Other, Operands);
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Load, {MemOp->getMemOperand()});
SDValue SuperReg = SDValue(Load, 0);
for (unsigned I = 0; I < NF; ++I) {
unsigned SubRegIdx = RISCVTargetLowering::getSubregIndexByMVT(VT, I);
ReplaceUses(SDValue(Node, I),
CurDAG->getTargetExtractSubreg(SubRegIdx, DL, VT, SuperReg));
}
ReplaceUses(SDValue(Node, NF), SDValue(Load, 1));
CurDAG->RemoveDeadNode(Node);
}
void RISCVDAGToDAGISel::selectVLSEGFF(SDNode *Node, bool IsMasked) {
SDLoc DL(Node);
unsigned NF = Node->getNumValues() - 2; // Do not count VL and Chain.
MVT VT = Node->getSimpleValueType(0);
MVT XLenVT = Subtarget->getXLenVT();
unsigned ScalarSize = VT.getScalarSizeInBits();
RISCVVLMUL LMUL = RISCVTargetLowering::getLMUL(VT);
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
unsigned CurOp = 2;
SmallVector<SDValue, 7> Operands;
if (IsMasked) {
SmallVector<SDValue, 8> Regs(Node->op_begin() + CurOp,
Node->op_begin() + CurOp + NF);
SDValue MaskedOff = createTuple(*CurDAG, Regs, NF, LMUL);
Operands.push_back(MaskedOff);
CurOp += NF;
}
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
const RISCV::VLSEGPseudo *P =
RISCV::getVLSEGPseudo(NF, IsMasked, /*Strided*/ false, /*FF*/ true,
ScalarSize, static_cast<unsigned>(LMUL));
MachineSDNode *Load = CurDAG->getMachineNode(P->Pseudo, DL, MVT::Untyped,
MVT::Other, MVT::Glue, Operands);
SDNode *ReadVL = CurDAG->getMachineNode(RISCV::PseudoReadVL, DL, XLenVT,
/*Glue*/ SDValue(Load, 2));
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Load, {MemOp->getMemOperand()});
SDValue SuperReg = SDValue(Load, 0);
for (unsigned I = 0; I < NF; ++I) {
unsigned SubRegIdx = RISCVTargetLowering::getSubregIndexByMVT(VT, I);
ReplaceUses(SDValue(Node, I),
CurDAG->getTargetExtractSubreg(SubRegIdx, DL, VT, SuperReg));
}
ReplaceUses(SDValue(Node, NF), SDValue(ReadVL, 0)); // VL
ReplaceUses(SDValue(Node, NF + 1), SDValue(Load, 1)); // Chain
CurDAG->RemoveDeadNode(Node);
}
void RISCVDAGToDAGISel::selectVLXSEG(SDNode *Node, bool IsMasked,
bool IsOrdered) {
SDLoc DL(Node);
unsigned NF = Node->getNumValues() - 1;
MVT VT = Node->getSimpleValueType(0);
unsigned ScalarSize = VT.getScalarSizeInBits();
MVT XLenVT = Subtarget->getXLenVT();
RISCVVLMUL LMUL = RISCVTargetLowering::getLMUL(VT);
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
unsigned CurOp = 2;
SmallVector<SDValue, 7> Operands;
if (IsMasked) {
SmallVector<SDValue, 8> Regs(Node->op_begin() + CurOp,
Node->op_begin() + CurOp + NF);
SDValue MaskedOff = createTuple(*CurDAG, Regs, NF, LMUL);
Operands.push_back(MaskedOff);
CurOp += NF;
}
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
Operands.push_back(Node->getOperand(CurOp++)); // Index.
MVT IndexVT = Operands.back()->getSimpleValueType(0);
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
assert(VT.getVectorElementCount() == IndexVT.getVectorElementCount() &&
"Element count mismatch");
RISCVVLMUL IndexLMUL = RISCVTargetLowering::getLMUL(IndexVT);
unsigned IndexScalarSize = IndexVT.getScalarSizeInBits();
const RISCV::VLXSEGPseudo *P = RISCV::getVLXSEGPseudo(
NF, IsMasked, IsOrdered, IndexScalarSize, static_cast<unsigned>(LMUL),
static_cast<unsigned>(IndexLMUL));
MachineSDNode *Load =
CurDAG->getMachineNode(P->Pseudo, DL, MVT::Untyped, MVT::Other, Operands);
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Load, {MemOp->getMemOperand()});
SDValue SuperReg = SDValue(Load, 0);
for (unsigned I = 0; I < NF; ++I) {
unsigned SubRegIdx = RISCVTargetLowering::getSubregIndexByMVT(VT, I);
ReplaceUses(SDValue(Node, I),
CurDAG->getTargetExtractSubreg(SubRegIdx, DL, VT, SuperReg));
}
ReplaceUses(SDValue(Node, NF), SDValue(Load, 1));
CurDAG->RemoveDeadNode(Node);
}
void RISCVDAGToDAGISel::selectVSSEG(SDNode *Node, bool IsMasked,
bool IsStrided) {
SDLoc DL(Node);
unsigned NF = Node->getNumOperands() - 4;
if (IsStrided)
NF--;
if (IsMasked)
NF--;
MVT VT = Node->getOperand(2)->getSimpleValueType(0);
unsigned ScalarSize = VT.getScalarSizeInBits();
MVT XLenVT = Subtarget->getXLenVT();
RISCVVLMUL LMUL = RISCVTargetLowering::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);
unsigned CurOp = 2 + NF;
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
if (IsStrided)
Operands.push_back(Node->getOperand(CurOp++)); // Stride.
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
const RISCV::VSSEGPseudo *P = RISCV::getVSSEGPseudo(
NF, IsMasked, IsStrided, ScalarSize, static_cast<unsigned>(LMUL));
MachineSDNode *Store =
CurDAG->getMachineNode(P->Pseudo, DL, Node->getValueType(0), Operands);
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Store, {MemOp->getMemOperand()});
ReplaceNode(Node, Store);
}
void RISCVDAGToDAGISel::selectVSXSEG(SDNode *Node, bool IsMasked,
bool IsOrdered) {
SDLoc DL(Node);
unsigned NF = Node->getNumOperands() - 5;
if (IsMasked)
--NF;
MVT VT = Node->getOperand(2)->getSimpleValueType(0);
unsigned ScalarSize = VT.getScalarSizeInBits();
MVT XLenVT = Subtarget->getXLenVT();
RISCVVLMUL LMUL = RISCVTargetLowering::getLMUL(VT);
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
SmallVector<SDValue, 7> Operands;
SmallVector<SDValue, 8> Regs(Node->op_begin() + 2, Node->op_begin() + 2 + NF);
SDValue StoreVal = createTuple(*CurDAG, Regs, NF, LMUL);
Operands.push_back(StoreVal);
unsigned CurOp = 2 + NF;
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
Operands.push_back(Node->getOperand(CurOp++)); // Index.
MVT IndexVT = Operands.back()->getSimpleValueType(0);
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
assert(VT.getVectorElementCount() == IndexVT.getVectorElementCount() &&
"Element count mismatch");
RISCVVLMUL IndexLMUL = RISCVTargetLowering::getLMUL(IndexVT);
unsigned IndexScalarSize = IndexVT.getScalarSizeInBits();
const RISCV::VSXSEGPseudo *P = RISCV::getVSXSEGPseudo(
NF, IsMasked, IsOrdered, IndexScalarSize, static_cast<unsigned>(LMUL),
static_cast<unsigned>(IndexLMUL));
MachineSDNode *Store =
CurDAG->getMachineNode(P->Pseudo, DL, Node->getValueType(0), Operands);
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Store, {MemOp->getMemOperand()});
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);
MVT VT = Node->getSimpleValueType(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.
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;
}
ReplaceNode(Node, selectImm(CurDAG, DL, ConstNode->getSExtValue(), 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::SRL: {
// Optimize (srl (and X, 0xffff), C) -> (srli (slli X, 16), 16 + C).
// Taking into account that the 0xffff may have had lower bits unset by
// SimplifyDemandedBits. This avoids materializing the 0xffff immediate.
// This pattern occurs when type legalizing i16 right shifts.
// FIXME: This could be extended to other AND masks.
auto *N1C = dyn_cast<ConstantSDNode>(Node->getOperand(1));
if (N1C) {
uint64_t ShAmt = N1C->getZExtValue();
SDValue N0 = Node->getOperand(0);
if (ShAmt < 16 && N0.getOpcode() == ISD::AND && N0.hasOneUse() &&
isa<ConstantSDNode>(N0.getOperand(1))) {
uint64_t Mask = N0.getConstantOperandVal(1);
Mask |= maskTrailingOnes<uint64_t>(ShAmt);
if (Mask == 0xffff) {
unsigned SLLOpc = Subtarget->is64Bit() ? RISCV::SLLIW : RISCV::SLLI;
unsigned SRLOpc = Subtarget->is64Bit() ? RISCV::SRLIW : RISCV::SRLI;
SDNode *SLLI =
CurDAG->getMachineNode(SLLOpc, DL, VT, N0->getOperand(0),
CurDAG->getTargetConstant(16, DL, VT));
SDNode *SRLI = CurDAG->getMachineNode(
SRLOpc, DL, VT, SDValue(SLLI, 0),
CurDAG->getTargetConstant(16 + ShAmt, DL, VT));
ReplaceNode(Node, SRLI);
return;
}
}
}
break;
}
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:
case Intrinsic::riscv_vsetvlimax: {
if (!Subtarget->hasStdExtV())
break;
bool VLMax = IntNo == Intrinsic::riscv_vsetvlimax;
unsigned Offset = VLMax ? 2 : 3;
assert(Node->getNumOperands() == Offset + 2 &&
"Unexpected number of operands");
RISCVVSEW VSEW =
static_cast<RISCVVSEW>(Node->getConstantOperandVal(Offset) & 0x7);
RISCVVLMUL VLMul = static_cast<RISCVVLMUL>(
Node->getConstantOperandVal(Offset + 1) & 0x7);
unsigned VTypeI = RISCVVType::encodeVTYPE(
VLMul, VSEW, /*TailAgnostic*/ true, /*MaskAgnostic*/ false);
SDValue VTypeIOp = CurDAG->getTargetConstant(VTypeI, DL, XLenVT);
SDValue VLOperand;
if (VLMax) {
VLOperand = CurDAG->getRegister(RISCV::X0, XLenVT);
} else {
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_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, /*IsMasked*/ false, /*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: {
selectVLSEG(Node, /*IsMasked*/ true, /*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, /*IsMasked*/ false, /*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: {
selectVLSEG(Node, /*IsMasked*/ true, /*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:
selectVLXSEG(Node, /*IsMasked*/ false, /*IsOrdered*/ true);
return;
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, /*IsMasked*/ false, /*IsOrdered*/ false);
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:
selectVLXSEG(Node, /*IsMasked*/ true, /*IsOrdered*/ true);
return;
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:
selectVLXSEG(Node, /*IsMasked*/ true, /*IsOrdered*/ false);
return;
case Intrinsic::riscv_vlseg8ff:
case Intrinsic::riscv_vlseg7ff:
case Intrinsic::riscv_vlseg6ff:
case Intrinsic::riscv_vlseg5ff:
case Intrinsic::riscv_vlseg4ff:
case Intrinsic::riscv_vlseg3ff:
case Intrinsic::riscv_vlseg2ff: {
selectVLSEGFF(Node, /*IsMasked*/ false);
return;
}
case Intrinsic::riscv_vlseg8ff_mask:
case Intrinsic::riscv_vlseg7ff_mask:
case Intrinsic::riscv_vlseg6ff_mask:
case Intrinsic::riscv_vlseg5ff_mask:
case Intrinsic::riscv_vlseg4ff_mask:
case Intrinsic::riscv_vlseg3ff_mask:
case Intrinsic::riscv_vlseg2ff_mask: {
selectVLSEGFF(Node, /*IsMasked*/ true);
return;
}
case Intrinsic::riscv_vloxei:
case Intrinsic::riscv_vloxei_mask:
case Intrinsic::riscv_vluxei:
case Intrinsic::riscv_vluxei_mask: {
bool IsMasked = IntNo == Intrinsic::riscv_vloxei_mask ||
IntNo == Intrinsic::riscv_vluxei_mask;
bool IsOrdered = IntNo == Intrinsic::riscv_vloxei ||
IntNo == Intrinsic::riscv_vloxei_mask;
MVT VT = Node->getSimpleValueType(0);
unsigned ScalarSize = VT.getScalarSizeInBits();
MVT XLenVT = Subtarget->getXLenVT();
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
unsigned CurOp = 2;
SmallVector<SDValue, 7> Operands;
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++));
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
Operands.push_back(Node->getOperand(CurOp++)); // Index.
MVT IndexVT = Operands.back()->getSimpleValueType(0);
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
assert(VT.getVectorElementCount() == IndexVT.getVectorElementCount() &&
"Element count mismatch");
RISCVVLMUL LMUL = RISCVTargetLowering::getLMUL(VT);
RISCVVLMUL IndexLMUL = RISCVTargetLowering::getLMUL(IndexVT);
unsigned IndexScalarSize = IndexVT.getScalarSizeInBits();
const RISCV::VLX_VSXPseudo *P = RISCV::getVLXPseudo(
IsMasked, IsOrdered, IndexScalarSize, static_cast<unsigned>(LMUL),
static_cast<unsigned>(IndexLMUL));
MachineSDNode *Load =
CurDAG->getMachineNode(P->Pseudo, DL, Node->getVTList(), Operands);
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Load, {MemOp->getMemOperand()});
ReplaceNode(Node, Load);
return;
}
case Intrinsic::riscv_vle1:
case Intrinsic::riscv_vle:
case Intrinsic::riscv_vle_mask:
case Intrinsic::riscv_vlse:
case Intrinsic::riscv_vlse_mask: {
bool IsMasked = IntNo == Intrinsic::riscv_vle_mask ||
IntNo == Intrinsic::riscv_vlse_mask;
bool IsStrided =
IntNo == Intrinsic::riscv_vlse || IntNo == Intrinsic::riscv_vlse_mask;
MVT VT = Node->getSimpleValueType(0);
unsigned ScalarSize = VT.getScalarSizeInBits();
MVT XLenVT = Subtarget->getXLenVT();
// VLE1 uses an SEW of 8.
unsigned SEWImm = (IntNo == Intrinsic::riscv_vle1) ? 8 : ScalarSize;
SDValue SEW = CurDAG->getTargetConstant(SEWImm, DL, XLenVT);
unsigned CurOp = 2;
SmallVector<SDValue, 7> Operands;
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++));
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
if (IsStrided)
Operands.push_back(Node->getOperand(CurOp++)); // Stride.
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
RISCVVLMUL LMUL = RISCVTargetLowering::getLMUL(VT);
const RISCV::VLEPseudo *P =
RISCV::getVLEPseudo(IsMasked, IsStrided, /*FF*/ false, ScalarSize,
static_cast<unsigned>(LMUL));
MachineSDNode *Load =
CurDAG->getMachineNode(P->Pseudo, DL, Node->getVTList(), Operands);
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Load, {MemOp->getMemOperand()});
ReplaceNode(Node, Load);
return;
}
case Intrinsic::riscv_vleff:
case Intrinsic::riscv_vleff_mask: {
bool IsMasked = IntNo == Intrinsic::riscv_vleff_mask;
MVT VT = Node->getSimpleValueType(0);
unsigned ScalarSize = VT.getScalarSizeInBits();
MVT XLenVT = Subtarget->getXLenVT();
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
unsigned CurOp = 2;
SmallVector<SDValue, 7> Operands;
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++));
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
RISCVVLMUL LMUL = RISCVTargetLowering::getLMUL(VT);
const RISCV::VLEPseudo *P =
RISCV::getVLEPseudo(IsMasked, /*Strided*/ false, /*FF*/ true,
ScalarSize, static_cast<unsigned>(LMUL));
MachineSDNode *Load =
CurDAG->getMachineNode(P->Pseudo, DL, Node->getValueType(0),
MVT::Other, MVT::Glue, Operands);
SDNode *ReadVL = CurDAG->getMachineNode(RISCV::PseudoReadVL, DL, XLenVT,
/*Glue*/ SDValue(Load, 2));
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Load, {MemOp->getMemOperand()});
ReplaceUses(SDValue(Node, 0), SDValue(Load, 0));
ReplaceUses(SDValue(Node, 1), SDValue(ReadVL, 0)); // VL
ReplaceUses(SDValue(Node, 2), SDValue(Load, 1)); // Chain
CurDAG->RemoveDeadNode(Node);
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, /*IsMasked*/ false, /*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: {
selectVSSEG(Node, /*IsMasked*/ true, /*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, /*IsMasked*/ false, /*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: {
selectVSSEG(Node, /*IsMasked*/ true, /*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:
selectVSXSEG(Node, /*IsMasked*/ false, /*IsOrdered*/ true);
return;
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, /*IsMasked*/ false, /*IsOrdered*/ false);
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:
selectVSXSEG(Node, /*IsMasked*/ true, /*IsOrdered*/ true);
return;
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:
selectVSXSEG(Node, /*IsMasked*/ true, /*IsOrdered*/ false);
return;
case Intrinsic::riscv_vsoxei:
case Intrinsic::riscv_vsoxei_mask:
case Intrinsic::riscv_vsuxei:
case Intrinsic::riscv_vsuxei_mask: {
bool IsMasked = IntNo == Intrinsic::riscv_vsoxei_mask ||
IntNo == Intrinsic::riscv_vsuxei_mask;
bool IsOrdered = IntNo == Intrinsic::riscv_vsoxei ||
IntNo == Intrinsic::riscv_vsoxei_mask;
MVT VT = Node->getOperand(2)->getSimpleValueType(0);
unsigned ScalarSize = VT.getScalarSizeInBits();
MVT XLenVT = Subtarget->getXLenVT();
SDValue SEW = CurDAG->getTargetConstant(ScalarSize, DL, XLenVT);
unsigned CurOp = 2;
SmallVector<SDValue, 6> Operands;
Operands.push_back(Node->getOperand(CurOp++)); // Store value.
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
Operands.push_back(Node->getOperand(CurOp++)); // Index.
MVT IndexVT = Operands.back()->getSimpleValueType(0);
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
assert(VT.getVectorElementCount() == IndexVT.getVectorElementCount() &&
"Element count mismatch");
RISCVVLMUL LMUL = RISCVTargetLowering::getLMUL(VT);
RISCVVLMUL IndexLMUL = RISCVTargetLowering::getLMUL(IndexVT);
unsigned IndexScalarSize = IndexVT.getScalarSizeInBits();
const RISCV::VLX_VSXPseudo *P = RISCV::getVSXPseudo(
IsMasked, IsOrdered, IndexScalarSize, static_cast<unsigned>(LMUL),
static_cast<unsigned>(IndexLMUL));
MachineSDNode *Store =
CurDAG->getMachineNode(P->Pseudo, DL, Node->getVTList(), Operands);
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Store, {MemOp->getMemOperand()});
ReplaceNode(Node, Store);
return;
}
case Intrinsic::riscv_vse1:
case Intrinsic::riscv_vse:
case Intrinsic::riscv_vse_mask:
case Intrinsic::riscv_vsse:
case Intrinsic::riscv_vsse_mask: {
bool IsMasked = IntNo == Intrinsic::riscv_vse_mask ||
IntNo == Intrinsic::riscv_vsse_mask;
bool IsStrided =
IntNo == Intrinsic::riscv_vsse || IntNo == Intrinsic::riscv_vsse_mask;
MVT VT = Node->getOperand(2)->getSimpleValueType(0);
unsigned ScalarSize = VT.getScalarSizeInBits();
MVT XLenVT = Subtarget->getXLenVT();
// VSE1 uses an SEW of 8.
unsigned SEWImm = (IntNo == Intrinsic::riscv_vse1) ? 8 : ScalarSize;
SDValue SEW = CurDAG->getTargetConstant(SEWImm, DL, XLenVT);
unsigned CurOp = 2;
SmallVector<SDValue, 6> Operands;
Operands.push_back(Node->getOperand(CurOp++)); // Store value.
SDValue Base;
SelectBaseAddr(Node->getOperand(CurOp++), Base);
Operands.push_back(Base); // Base pointer.
if (IsStrided)
Operands.push_back(Node->getOperand(CurOp++)); // Stride.
if (IsMasked)
Operands.push_back(Node->getOperand(CurOp++)); // Mask.
SDValue VL;
selectVLOp(Node->getOperand(CurOp++), VL);
Operands.push_back(VL);
Operands.push_back(SEW);
Operands.push_back(Node->getOperand(0)); // Chain.
RISCVVLMUL LMUL = RISCVTargetLowering::getLMUL(VT);
const RISCV::VSEPseudo *P = RISCV::getVSEPseudo(
IsMasked, IsStrided, ScalarSize, static_cast<unsigned>(LMUL));
MachineSDNode *Store =
CurDAG->getMachineNode(P->Pseudo, DL, Node->getVTList(), Operands);
if (auto *MemOp = dyn_cast<MemSDNode>(Node))
CurDAG->setNodeMemRefs(Store, {MemOp->getMemOperand()});
ReplaceNode(Node, Store);
return;
}
}
break;
}
case ISD::BITCAST: {
MVT SrcVT = Node->getOperand(0).getSimpleValueType();
// Just drop bitcasts between vectors if both are fixed or both are
// scalable.
if ((VT.isScalableVector() && SrcVT.isScalableVector()) ||
(VT.isFixedLengthVector() && SrcVT.isFixedLengthVector())) {
ReplaceUses(SDValue(Node, 0), Node->getOperand(0));
CurDAG->RemoveDeadNode(Node);
return;
}
break;
}
case ISD::INSERT_SUBVECTOR: {
SDValue V = Node->getOperand(0);
SDValue SubV = Node->getOperand(1);
SDLoc DL(SubV);
auto Idx = Node->getConstantOperandVal(2);
MVT SubVecVT = SubV.getSimpleValueType();
MVT SubVecContainerVT = SubVecVT;
// Establish the correct scalable-vector types for any fixed-length type.
if (SubVecVT.isFixedLengthVector())
SubVecContainerVT = RISCVTargetLowering::getContainerForFixedLengthVector(
*CurDAG, SubVecVT, *Subtarget);
if (VT.isFixedLengthVector())
VT = RISCVTargetLowering::getContainerForFixedLengthVector(*CurDAG, VT,
*Subtarget);
const auto *TRI = Subtarget->getRegisterInfo();
unsigned SubRegIdx;
std::tie(SubRegIdx, Idx) =
RISCVTargetLowering::decomposeSubvectorInsertExtractToSubRegs(
VT, SubVecContainerVT, Idx, TRI);
// If the Idx hasn't been completely eliminated then this is a subvector
// insert which doesn't naturally align to a vector register. These must
// be handled using instructions to manipulate the vector registers.
if (Idx != 0)
break;
RISCVVLMUL SubVecLMUL = RISCVTargetLowering::getLMUL(SubVecContainerVT);
bool IsSubVecPartReg = SubVecLMUL == RISCVVLMUL::LMUL_F2 ||
SubVecLMUL == RISCVVLMUL::LMUL_F4 ||
SubVecLMUL == RISCVVLMUL::LMUL_F8;
(void)IsSubVecPartReg; // Silence unused variable warning without asserts.
assert((!IsSubVecPartReg || V.isUndef()) &&
"Expecting lowering to have created legal INSERT_SUBVECTORs when "
"the subvector is smaller than a full-sized register");
// If we haven't set a SubRegIdx, then we must be going between
// equally-sized LMUL groups (e.g. VR -> VR). This can be done as a copy.
if (SubRegIdx == RISCV::NoSubRegister) {
unsigned InRegClassID = RISCVTargetLowering::getRegClassIDForVecVT(VT);
assert(RISCVTargetLowering::getRegClassIDForVecVT(SubVecContainerVT) ==
InRegClassID &&
"Unexpected subvector extraction");
SDValue RC = CurDAG->getTargetConstant(InRegClassID, DL, XLenVT);
SDNode *NewNode = CurDAG->getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
DL, VT, SubV, RC);
return ReplaceNode(Node, NewNode);
}
SDValue Insert = CurDAG->getTargetInsertSubreg(SubRegIdx, DL, VT, V, SubV);
return ReplaceNode(Node, Insert.getNode());
}
case ISD::EXTRACT_SUBVECTOR: {
SDValue V = Node->getOperand(0);
auto Idx = Node->getConstantOperandVal(1);
MVT InVT = V.getSimpleValueType();
SDLoc DL(V);
MVT SubVecContainerVT = VT;
// Establish the correct scalable-vector types for any fixed-length type.
if (VT.isFixedLengthVector())
SubVecContainerVT = RISCVTargetLowering::getContainerForFixedLengthVector(
*CurDAG, VT, *Subtarget);
if (InVT.isFixedLengthVector())
InVT = RISCVTargetLowering::getContainerForFixedLengthVector(
*CurDAG, InVT, *Subtarget);
const auto *TRI = Subtarget->getRegisterInfo();
unsigned SubRegIdx;
std::tie(SubRegIdx, Idx) =
RISCVTargetLowering::decomposeSubvectorInsertExtractToSubRegs(
InVT, SubVecContainerVT, Idx, TRI);
// If the Idx hasn't been completely eliminated then this is a subvector
// extract which doesn't naturally align to a vector register. These must
// be handled using instructions to manipulate the vector registers.
if (Idx != 0)
break;
// If we haven't set a SubRegIdx, then we must be going between
// equally-sized LMUL types (e.g. VR -> VR). This can be done as a copy.
if (SubRegIdx == RISCV::NoSubRegister) {
unsigned InRegClassID = RISCVTargetLowering::getRegClassIDForVecVT(InVT);
assert(RISCVTargetLowering::getRegClassIDForVecVT(SubVecContainerVT) ==
InRegClassID &&
"Unexpected subvector extraction");
SDValue RC = CurDAG->getTargetConstant(InRegClassID, DL, XLenVT);
SDNode *NewNode =
CurDAG->getMachineNode(TargetOpcode::COPY_TO_REGCLASS, DL, VT, V, RC);
return ReplaceNode(Node, NewNode);
}
SDValue Extract = CurDAG->getTargetExtractSubreg(SubRegIdx, DL, VT, V);
return ReplaceNode(Node, Extract.getNode());
}
}
// 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;
}
bool RISCVDAGToDAGISel::SelectBaseAddr(SDValue Addr, SDValue &Base) {
// If this is FrameIndex, select it directly. Otherwise just let it get
// selected to a register independently.
if (auto *FIN = dyn_cast<FrameIndexSDNode>(Addr))
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), Subtarget->getXLenVT());
else
Base = Addr;
return true;
}
bool RISCVDAGToDAGISel::selectShiftMask(SDValue N, unsigned ShiftWidth,
SDValue &ShAmt) {
// Shift instructions on RISCV only read the lower 5 or 6 bits of the shift
// amount. If there is an AND on the shift amount, we can bypass it if it
// doesn't affect any of those bits.
if (N.getOpcode() == ISD::AND && isa<ConstantSDNode>(N.getOperand(1))) {
const APInt &AndMask = N->getConstantOperandAPInt(1);
// Since the max shift amount is a power of 2 we can subtract 1 to make a
// mask that covers the bits needed to represent all shift amounts.
assert(isPowerOf2_32(ShiftWidth) && "Unexpected max shift amount!");
APInt ShMask(AndMask.getBitWidth(), ShiftWidth - 1);
if (ShMask.isSubsetOf(AndMask)) {
ShAmt = N.getOperand(0);
return true;
}
// SimplifyDemandedBits may have optimized the mask so try restoring any
// bits that are known zero.
KnownBits Known = CurDAG->computeKnownBits(N->getOperand(0));
if (ShMask.isSubsetOf(AndMask | Known.Zero)) {
ShAmt = N.getOperand(0);
return true;
}
}
ShAmt = N;
return true;
}
bool RISCVDAGToDAGISel::selectSExti32(SDValue N, SDValue &Val) {
if (N.getOpcode() == ISD::SIGN_EXTEND_INREG &&
cast<VTSDNode>(N.getOperand(1))->getVT() == MVT::i32) {
Val = N.getOperand(0);
return true;
}
// FIXME: Should we just call computeNumSignBits here?
if (N.getOpcode() == ISD::AssertSext &&
cast<VTSDNode>(N->getOperand(1))->getVT().bitsLE(MVT::i32)) {
Val = N;
return true;
}
if (N.getOpcode() == ISD::AssertZext &&
cast<VTSDNode>(N->getOperand(1))->getVT().bitsLT(MVT::i32)) {
Val = N;
return true;
}
return false;
}
bool RISCVDAGToDAGISel::selectZExti32(SDValue N, SDValue &Val) {
if (N.getOpcode() == ISD::AND) {
auto *C = dyn_cast<ConstantSDNode>(N.getOperand(1));
if (C && CheckAndMask(N.getOperand(0), C, UINT64_C(0xFFFFFFFF))) {
Val = N.getOperand(0);
return true;
}
}
// FIXME: Should we just call computeKnownBits here?
if (N.getOpcode() == ISD::AssertZext &&
cast<VTSDNode>(N->getOperand(1))->getVT().bitsLE(MVT::i32)) {
Val = N;
return true;
}
return false;
}
// 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 &&
N.getOpcode() != RISCVISD::VMV_V_X_VL)
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 &&
N.getOpcode() != RISCVISD::VMV_V_X_VL) ||
!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).
MVT XLenVT = Subtarget->getXLenVT();
assert(XLenVT == N.getOperand(0).getSimpleValueType() &&
"Unexpected splat operand type");
MVT EltVT = N.getSimpleValueType().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 &&
N.getOpcode() != RISCVISD::VMV_V_X_VL) ||
!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;
}
bool RISCVDAGToDAGISel::selectRVVSimm5(SDValue N, unsigned Width,
SDValue &Imm) {
if (auto *C = dyn_cast<ConstantSDNode>(N)) {
int64_t ImmVal = SignExtend64(C->getSExtValue(), Width);
if (!isInt<5>(ImmVal))
return false;
Imm = CurDAG->getTargetConstant(ImmVal, SDLoc(N), Subtarget->getXLenVT());
return true;
}
return false;
}
bool RISCVDAGToDAGISel::selectRVVUimm5(SDValue N, unsigned Width,
SDValue &Imm) {
if (auto *C = dyn_cast<ConstantSDNode>(N)) {
int64_t ImmVal = C->getSExtValue();
if (!isUInt<5>(ImmVal))
return false;
Imm = CurDAG->getTargetConstant(ImmVal, SDLoc(N), Subtarget->getXLenVT());
return true;
}
return false;
}
// 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);
}