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//===-- ARMISelDAGToDAG.cpp - A dag to dag inst selector for ARM ----------===//
//
// 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 ARM target.
//
//===----------------------------------------------------------------------===//
#include "ARM.h"
#include "ARMBaseInstrInfo.h"
#include "ARMTargetMachine.h"
#include "MCTargetDesc/ARMAddressingModes.h"
#include "Utils/ARMBaseInfo.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/IntrinsicsARM.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
#define DEBUG_TYPE "arm-isel"
static cl::opt<bool>
DisableShifterOp("disable-shifter-op", cl::Hidden,
cl::desc("Disable isel of shifter-op"),
cl::init(false));
//===--------------------------------------------------------------------===//
/// ARMDAGToDAGISel - ARM specific code to select ARM machine
/// instructions for SelectionDAG operations.
///
namespace {
class ARMDAGToDAGISel : public SelectionDAGISel {
/// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
/// make the right decision when generating code for different targets.
const ARMSubtarget *Subtarget;
public:
explicit ARMDAGToDAGISel(ARMBaseTargetMachine &tm, CodeGenOpt::Level OptLevel)
: SelectionDAGISel(tm, OptLevel) {}
bool runOnMachineFunction(MachineFunction &MF) override {
// Reset the subtarget each time through.
Subtarget = &MF.getSubtarget<ARMSubtarget>();
SelectionDAGISel::runOnMachineFunction(MF);
return true;
}
StringRef getPassName() const override { return "ARM Instruction Selection"; }
void PreprocessISelDAG() override;
/// getI32Imm - Return a target constant of type i32 with the specified
/// value.
inline SDValue getI32Imm(unsigned Imm, const SDLoc &dl) {
return CurDAG->getTargetConstant(Imm, dl, MVT::i32);
}
void Select(SDNode *N) override;
bool hasNoVMLxHazardUse(SDNode *N) const;
bool isShifterOpProfitable(const SDValue &Shift,
ARM_AM::ShiftOpc ShOpcVal, unsigned ShAmt);
bool SelectRegShifterOperand(SDValue N, SDValue &A,
SDValue &B, SDValue &C,
bool CheckProfitability = true);
bool SelectImmShifterOperand(SDValue N, SDValue &A,
SDValue &B, bool CheckProfitability = true);
bool SelectShiftRegShifterOperand(SDValue N, SDValue &A,
SDValue &B, SDValue &C) {
// Don't apply the profitability check
return SelectRegShifterOperand(N, A, B, C, false);
}
bool SelectShiftImmShifterOperand(SDValue N, SDValue &A,
SDValue &B) {
// Don't apply the profitability check
return SelectImmShifterOperand(N, A, B, false);
}
bool SelectAddLikeOr(SDNode *Parent, SDValue N, SDValue &Out);
bool SelectAddrModeImm12(SDValue N, SDValue &Base, SDValue &OffImm);
bool SelectLdStSOReg(SDValue N, SDValue &Base, SDValue &Offset, SDValue &Opc);
bool SelectCMOVPred(SDValue N, SDValue &Pred, SDValue &Reg) {
const ConstantSDNode *CN = cast<ConstantSDNode>(N);
Pred = CurDAG->getTargetConstant(CN->getZExtValue(), SDLoc(N), MVT::i32);
Reg = CurDAG->getRegister(ARM::CPSR, MVT::i32);
return true;
}
bool SelectAddrMode2OffsetReg(SDNode *Op, SDValue N,
SDValue &Offset, SDValue &Opc);
bool SelectAddrMode2OffsetImm(SDNode *Op, SDValue N,
SDValue &Offset, SDValue &Opc);
bool SelectAddrMode2OffsetImmPre(SDNode *Op, SDValue N,
SDValue &Offset, SDValue &Opc);
bool SelectAddrOffsetNone(SDValue N, SDValue &Base);
bool SelectAddrMode3(SDValue N, SDValue &Base,
SDValue &Offset, SDValue &Opc);
bool SelectAddrMode3Offset(SDNode *Op, SDValue N,
SDValue &Offset, SDValue &Opc);
bool IsAddressingMode5(SDValue N, SDValue &Base, SDValue &Offset, bool FP16);
bool SelectAddrMode5(SDValue N, SDValue &Base, SDValue &Offset);
bool SelectAddrMode5FP16(SDValue N, SDValue &Base, SDValue &Offset);
bool SelectAddrMode6(SDNode *Parent, SDValue N, SDValue &Addr,SDValue &Align);
bool SelectAddrMode6Offset(SDNode *Op, SDValue N, SDValue &Offset);
bool SelectAddrModePC(SDValue N, SDValue &Offset, SDValue &Label);
// Thumb Addressing Modes:
bool SelectThumbAddrModeRR(SDValue N, SDValue &Base, SDValue &Offset);
bool SelectThumbAddrModeRRSext(SDValue N, SDValue &Base, SDValue &Offset);
bool SelectThumbAddrModeImm5S(SDValue N, unsigned Scale, SDValue &Base,
SDValue &OffImm);
bool SelectThumbAddrModeImm5S1(SDValue N, SDValue &Base,
SDValue &OffImm);
bool SelectThumbAddrModeImm5S2(SDValue N, SDValue &Base,
SDValue &OffImm);
bool SelectThumbAddrModeImm5S4(SDValue N, SDValue &Base,
SDValue &OffImm);
bool SelectThumbAddrModeSP(SDValue N, SDValue &Base, SDValue &OffImm);
template <unsigned Shift>
bool SelectTAddrModeImm7(SDValue N, SDValue &Base, SDValue &OffImm);
// Thumb 2 Addressing Modes:
bool SelectT2AddrModeImm12(SDValue N, SDValue &Base, SDValue &OffImm);
bool SelectT2AddrModeImm8(SDValue N, SDValue &Base,
SDValue &OffImm);
bool SelectT2AddrModeImm8Offset(SDNode *Op, SDValue N,
SDValue &OffImm);
template <unsigned Shift>
bool SelectT2AddrModeImm7Offset(SDNode *Op, SDValue N, SDValue &OffImm);
bool SelectT2AddrModeImm7Offset(SDNode *Op, SDValue N, SDValue &OffImm,
unsigned Shift);
template <unsigned Shift>
bool SelectT2AddrModeImm7(SDValue N, SDValue &Base, SDValue &OffImm);
bool SelectT2AddrModeSoReg(SDValue N, SDValue &Base,
SDValue &OffReg, SDValue &ShImm);
bool SelectT2AddrModeExclusive(SDValue N, SDValue &Base, SDValue &OffImm);
template<int Min, int Max>
bool SelectImmediateInRange(SDValue N, SDValue &OffImm);
inline bool is_so_imm(unsigned Imm) const {
return ARM_AM::getSOImmVal(Imm) != -1;
}
inline bool is_so_imm_not(unsigned Imm) const {
return ARM_AM::getSOImmVal(~Imm) != -1;
}
inline bool is_t2_so_imm(unsigned Imm) const {
return ARM_AM::getT2SOImmVal(Imm) != -1;
}
inline bool is_t2_so_imm_not(unsigned Imm) const {
return ARM_AM::getT2SOImmVal(~Imm) != -1;
}
// Include the pieces autogenerated from the target description.
#include "ARMGenDAGISel.inc"
private:
void transferMemOperands(SDNode *Src, SDNode *Dst);
/// Indexed (pre/post inc/dec) load matching code for ARM.
bool tryARMIndexedLoad(SDNode *N);
bool tryT1IndexedLoad(SDNode *N);
bool tryT2IndexedLoad(SDNode *N);
bool tryMVEIndexedLoad(SDNode *N);
/// SelectVLD - Select NEON load intrinsics. NumVecs should be
/// 1, 2, 3 or 4. The opcode arrays specify the instructions used for
/// loads of D registers and even subregs and odd subregs of Q registers.
/// For NumVecs <= 2, QOpcodes1 is not used.
void SelectVLD(SDNode *N, bool isUpdating, unsigned NumVecs,
const uint16_t *DOpcodes, const uint16_t *QOpcodes0,
const uint16_t *QOpcodes1);
/// SelectVST - Select NEON store intrinsics. NumVecs should
/// be 1, 2, 3 or 4. The opcode arrays specify the instructions used for
/// stores of D registers and even subregs and odd subregs of Q registers.
/// For NumVecs <= 2, QOpcodes1 is not used.
void SelectVST(SDNode *N, bool isUpdating, unsigned NumVecs,
const uint16_t *DOpcodes, const uint16_t *QOpcodes0,
const uint16_t *QOpcodes1);
/// SelectVLDSTLane - Select NEON load/store lane intrinsics. NumVecs should
/// be 2, 3 or 4. The opcode arrays specify the instructions used for
/// load/store of D registers and Q registers.
void SelectVLDSTLane(SDNode *N, bool IsLoad, bool isUpdating,
unsigned NumVecs, const uint16_t *DOpcodes,
const uint16_t *QOpcodes);
/// Helper functions for setting up clusters of MVE predication operands.
template <typename SDValueVector>
void AddMVEPredicateToOps(SDValueVector &Ops, SDLoc Loc,
SDValue PredicateMask);
template <typename SDValueVector>
void AddMVEPredicateToOps(SDValueVector &Ops, SDLoc Loc,
SDValue PredicateMask, SDValue Inactive);
template <typename SDValueVector>
void AddEmptyMVEPredicateToOps(SDValueVector &Ops, SDLoc Loc);
template <typename SDValueVector>
void AddEmptyMVEPredicateToOps(SDValueVector &Ops, SDLoc Loc, EVT InactiveTy);
/// SelectMVE_WB - Select MVE writeback load/store intrinsics.
void SelectMVE_WB(SDNode *N, const uint16_t *Opcodes, bool Predicated);
/// SelectMVE_LongShift - Select MVE 64-bit scalar shift intrinsics.
void SelectMVE_LongShift(SDNode *N, uint16_t Opcode, bool Immediate,
bool HasSaturationOperand);
/// SelectMVE_VADCSBC - Select MVE vector add/sub-with-carry intrinsics.
void SelectMVE_VADCSBC(SDNode *N, uint16_t OpcodeWithCarry,
uint16_t OpcodeWithNoCarry, bool Add, bool Predicated);
/// Select long MVE vector reductions with two vector operands
/// Stride is the number of vector element widths the instruction can operate
/// on:
/// 2 for long non-rounding variants, vml{a,s}ldav[a][x]: [i16, i32]
/// 1 for long rounding variants: vrml{a,s}ldavh[a][x]: [i32]
/// Stride is used when addressing the OpcodesS array which contains multiple
/// opcodes for each element width.
/// TySize is the index into the list of element types listed above
void SelectBaseMVE_VMLLDAV(SDNode *N, bool Predicated,
const uint16_t *OpcodesS, const uint16_t *OpcodesU,
size_t Stride, size_t TySize);
/// Select a 64-bit MVE vector reduction with two vector operands
/// arm_mve_vmlldava_[predicated]
void SelectMVE_VMLLDAV(SDNode *N, bool Predicated, const uint16_t *OpcodesS,
const uint16_t *OpcodesU);
/// Select a 72-bit MVE vector rounding reduction with two vector operands
/// int_arm_mve_vrmlldavha[_predicated]
void SelectMVE_VRMLLDAVH(SDNode *N, bool Predicated, const uint16_t *OpcodesS,
const uint16_t *OpcodesU);
/// SelectMVE_VLD - Select MVE interleaving load intrinsics. NumVecs
/// should be 2 or 4. The opcode array specifies the instructions
/// used for 8, 16 and 32-bit lane sizes respectively, and each
/// pointer points to a set of NumVecs sub-opcodes used for the
/// different stages (e.g. VLD20 versus VLD21) of each load family.
void SelectMVE_VLD(SDNode *N, unsigned NumVecs,
const uint16_t *const *Opcodes);
/// SelectVLDDup - Select NEON load-duplicate intrinsics. NumVecs
/// should be 1, 2, 3 or 4. The opcode array specifies the instructions used
/// for loading D registers.
void SelectVLDDup(SDNode *N, bool IsIntrinsic, bool isUpdating,
unsigned NumVecs, const uint16_t *DOpcodes,
const uint16_t *QOpcodes0 = nullptr,
const uint16_t *QOpcodes1 = nullptr);
/// Try to select SBFX/UBFX instructions for ARM.
bool tryV6T2BitfieldExtractOp(SDNode *N, bool isSigned);
// Select special operations if node forms integer ABS pattern
bool tryABSOp(SDNode *N);
bool tryReadRegister(SDNode *N);
bool tryWriteRegister(SDNode *N);
bool tryInlineAsm(SDNode *N);
void SelectCMPZ(SDNode *N, bool &SwitchEQNEToPLMI);
void SelectCMP_SWAP(SDNode *N);
/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
/// inline asm expressions.
bool SelectInlineAsmMemoryOperand(const SDValue &Op, unsigned ConstraintID,
std::vector<SDValue> &OutOps) override;
// Form pairs of consecutive R, S, D, or Q registers.
SDNode *createGPRPairNode(EVT VT, SDValue V0, SDValue V1);
SDNode *createSRegPairNode(EVT VT, SDValue V0, SDValue V1);
SDNode *createDRegPairNode(EVT VT, SDValue V0, SDValue V1);
SDNode *createQRegPairNode(EVT VT, SDValue V0, SDValue V1);
// Form sequences of 4 consecutive S, D, or Q registers.
SDNode *createQuadSRegsNode(EVT VT, SDValue V0, SDValue V1, SDValue V2, SDValue V3);
SDNode *createQuadDRegsNode(EVT VT, SDValue V0, SDValue V1, SDValue V2, SDValue V3);
SDNode *createQuadQRegsNode(EVT VT, SDValue V0, SDValue V1, SDValue V2, SDValue V3);
// Get the alignment operand for a NEON VLD or VST instruction.
SDValue GetVLDSTAlign(SDValue Align, const SDLoc &dl, unsigned NumVecs,
bool is64BitVector);
/// Checks if N is a multiplication by a constant where we can extract out a
/// power of two from the constant so that it can be used in a shift, but only
/// if it simplifies the materialization of the constant. Returns true if it
/// is, and assigns to PowerOfTwo the power of two that should be extracted
/// out and to NewMulConst the new constant to be multiplied by.
bool canExtractShiftFromMul(const SDValue &N, unsigned MaxShift,
unsigned &PowerOfTwo, SDValue &NewMulConst) const;
/// Replace N with M in CurDAG, in a way that also ensures that M gets
/// selected when N would have been selected.
void replaceDAGValue(const SDValue &N, SDValue M);
};
}
/// isInt32Immediate - This method tests to see if the node is a 32-bit constant
/// operand. If so Imm will receive the 32-bit value.
static bool isInt32Immediate(SDNode *N, unsigned &Imm) {
if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) {
Imm = cast<ConstantSDNode>(N)->getZExtValue();
return true;
}
return false;
}
// isInt32Immediate - This method tests to see if a constant operand.
// If so Imm will receive the 32 bit value.
static bool isInt32Immediate(SDValue N, unsigned &Imm) {
return isInt32Immediate(N.getNode(), Imm);
}
// isOpcWithIntImmediate - This method tests to see if the node is a specific
// opcode and that it has a immediate integer right operand.
// If so Imm will receive the 32 bit value.
static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) {
return N->getOpcode() == Opc &&
isInt32Immediate(N->getOperand(1).getNode(), Imm);
}
/// Check whether a particular node is a constant value representable as
/// (N * Scale) where (N in [\p RangeMin, \p RangeMax).
///
/// \param ScaledConstant [out] - On success, the pre-scaled constant value.
static bool isScaledConstantInRange(SDValue Node, int Scale,
int RangeMin, int RangeMax,
int &ScaledConstant) {
assert(Scale > 0 && "Invalid scale!");
// Check that this is a constant.
const ConstantSDNode *C = dyn_cast<ConstantSDNode>(Node);
if (!C)
return false;
ScaledConstant = (int) C->getZExtValue();
if ((ScaledConstant % Scale) != 0)
return false;
ScaledConstant /= Scale;
return ScaledConstant >= RangeMin && ScaledConstant < RangeMax;
}
void ARMDAGToDAGISel::PreprocessISelDAG() {
if (!Subtarget->hasV6T2Ops())
return;
bool isThumb2 = Subtarget->isThumb();
for (SelectionDAG::allnodes_iterator I = CurDAG->allnodes_begin(),
E = CurDAG->allnodes_end(); I != E; ) {
SDNode *N = &*I++; // Preincrement iterator to avoid invalidation issues.
if (N->getOpcode() != ISD::ADD)
continue;
// Look for (add X1, (and (srl X2, c1), c2)) where c2 is constant with
// leading zeros, followed by consecutive set bits, followed by 1 or 2
// trailing zeros, e.g. 1020.
// Transform the expression to
// (add X1, (shl (and (srl X2, c1), (c2>>tz)), tz)) where tz is the number
// of trailing zeros of c2. The left shift would be folded as an shifter
// operand of 'add' and the 'and' and 'srl' would become a bits extraction
// node (UBFX).
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
unsigned And_imm = 0;
if (!isOpcWithIntImmediate(N1.getNode(), ISD::AND, And_imm)) {
if (isOpcWithIntImmediate(N0.getNode(), ISD::AND, And_imm))
std::swap(N0, N1);
}
if (!And_imm)
continue;
// Check if the AND mask is an immediate of the form: 000.....1111111100
unsigned TZ = countTrailingZeros(And_imm);
if (TZ != 1 && TZ != 2)
// Be conservative here. Shifter operands aren't always free. e.g. On
// Swift, left shifter operand of 1 / 2 for free but others are not.
// e.g.
// ubfx r3, r1, #16, #8
// ldr.w r3, [r0, r3, lsl #2]
// vs.
// mov.w r9, #1020
// and.w r2, r9, r1, lsr #14
// ldr r2, [r0, r2]
continue;
And_imm >>= TZ;
if (And_imm & (And_imm + 1))
continue;
// Look for (and (srl X, c1), c2).
SDValue Srl = N1.getOperand(0);
unsigned Srl_imm = 0;
if (!isOpcWithIntImmediate(Srl.getNode(), ISD::SRL, Srl_imm) ||
(Srl_imm <= 2))
continue;
// Make sure first operand is not a shifter operand which would prevent
// folding of the left shift.
SDValue CPTmp0;
SDValue CPTmp1;
SDValue CPTmp2;
if (isThumb2) {
if (SelectImmShifterOperand(N0, CPTmp0, CPTmp1))
continue;
} else {
if (SelectImmShifterOperand(N0, CPTmp0, CPTmp1) ||
SelectRegShifterOperand(N0, CPTmp0, CPTmp1, CPTmp2))
continue;
}
// Now make the transformation.
Srl = CurDAG->getNode(ISD::SRL, SDLoc(Srl), MVT::i32,
Srl.getOperand(0),
CurDAG->getConstant(Srl_imm + TZ, SDLoc(Srl),
MVT::i32));
N1 = CurDAG->getNode(ISD::AND, SDLoc(N1), MVT::i32,
Srl,
CurDAG->getConstant(And_imm, SDLoc(Srl), MVT::i32));
N1 = CurDAG->getNode(ISD::SHL, SDLoc(N1), MVT::i32,
N1, CurDAG->getConstant(TZ, SDLoc(Srl), MVT::i32));
CurDAG->UpdateNodeOperands(N, N0, N1);
}
}
/// hasNoVMLxHazardUse - Return true if it's desirable to select a FP MLA / MLS
/// node. VFP / NEON fp VMLA / VMLS instructions have special RAW hazards (at
/// least on current ARM implementations) which should be avoidded.
bool ARMDAGToDAGISel::hasNoVMLxHazardUse(SDNode *N) const {
if (OptLevel == CodeGenOpt::None)
return true;
if (!Subtarget->hasVMLxHazards())
return true;
if (!N->hasOneUse())
return false;
SDNode *Use = *N->use_begin();
if (Use->getOpcode() == ISD::CopyToReg)
return true;
if (Use->isMachineOpcode()) {
const ARMBaseInstrInfo *TII = static_cast<const ARMBaseInstrInfo *>(
CurDAG->getSubtarget().getInstrInfo());
const MCInstrDesc &MCID = TII->get(Use->getMachineOpcode());
if (MCID.mayStore())
return true;
unsigned Opcode = MCID.getOpcode();
if (Opcode == ARM::VMOVRS || Opcode == ARM::VMOVRRD)
return true;
// vmlx feeding into another vmlx. We actually want to unfold
// the use later in the MLxExpansion pass. e.g.
// vmla
// vmla (stall 8 cycles)
//
// vmul (5 cycles)
// vadd (5 cycles)
// vmla
// This adds up to about 18 - 19 cycles.
//
// vmla
// vmul (stall 4 cycles)
// vadd adds up to about 14 cycles.
return TII->isFpMLxInstruction(Opcode);
}
return false;
}
bool ARMDAGToDAGISel::isShifterOpProfitable(const SDValue &Shift,
ARM_AM::ShiftOpc ShOpcVal,
unsigned ShAmt) {
if (!Subtarget->isLikeA9() && !Subtarget->isSwift())
return true;
if (Shift.hasOneUse())
return true;
// R << 2 is free.
return ShOpcVal == ARM_AM::lsl &&
(ShAmt == 2 || (Subtarget->isSwift() && ShAmt == 1));
}
bool ARMDAGToDAGISel::canExtractShiftFromMul(const SDValue &N,
unsigned MaxShift,
unsigned &PowerOfTwo,
SDValue &NewMulConst) const {
assert(N.getOpcode() == ISD::MUL);
assert(MaxShift > 0);
// If the multiply is used in more than one place then changing the constant
// will make other uses incorrect, so don't.
if (!N.hasOneUse()) return false;
// Check if the multiply is by a constant
ConstantSDNode *MulConst = dyn_cast<ConstantSDNode>(N.getOperand(1));
if (!MulConst) return false;
// If the constant is used in more than one place then modifying it will mean
// we need to materialize two constants instead of one, which is a bad idea.
if (!MulConst->hasOneUse()) return false;
unsigned MulConstVal = MulConst->getZExtValue();
if (MulConstVal == 0) return false;
// Find the largest power of 2 that MulConstVal is a multiple of
PowerOfTwo = MaxShift;
while ((MulConstVal % (1 << PowerOfTwo)) != 0) {
--PowerOfTwo;
if (PowerOfTwo == 0) return false;
}
// Only optimise if the new cost is better
unsigned NewMulConstVal = MulConstVal / (1 << PowerOfTwo);
NewMulConst = CurDAG->getConstant(NewMulConstVal, SDLoc(N), MVT::i32);
unsigned OldCost = ConstantMaterializationCost(MulConstVal, Subtarget);
unsigned NewCost = ConstantMaterializationCost(NewMulConstVal, Subtarget);
return NewCost < OldCost;
}
void ARMDAGToDAGISel::replaceDAGValue(const SDValue &N, SDValue M) {
CurDAG->RepositionNode(N.getNode()->getIterator(), M.getNode());
ReplaceUses(N, M);
}
bool ARMDAGToDAGISel::SelectImmShifterOperand(SDValue N,
SDValue &BaseReg,
SDValue &Opc,
bool CheckProfitability) {
if (DisableShifterOp)
return false;
// If N is a multiply-by-constant and it's profitable to extract a shift and
// use it in a shifted operand do so.
if (N.getOpcode() == ISD::MUL) {
unsigned PowerOfTwo = 0;
SDValue NewMulConst;
if (canExtractShiftFromMul(N, 31, PowerOfTwo, NewMulConst)) {
HandleSDNode Handle(N);
SDLoc Loc(N);
replaceDAGValue(N.getOperand(1), NewMulConst);
BaseReg = Handle.getValue();
Opc = CurDAG->getTargetConstant(
ARM_AM::getSORegOpc(ARM_AM::lsl, PowerOfTwo), Loc, MVT::i32);
return true;
}
}
ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOpcode());
// Don't match base register only case. That is matched to a separate
// lower complexity pattern with explicit register operand.
if (ShOpcVal == ARM_AM::no_shift) return false;
BaseReg = N.getOperand(0);
unsigned ShImmVal = 0;
ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1));
if (!RHS) return false;
ShImmVal = RHS->getZExtValue() & 31;
Opc = CurDAG->getTargetConstant(ARM_AM::getSORegOpc(ShOpcVal, ShImmVal),
SDLoc(N), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectRegShifterOperand(SDValue N,
SDValue &BaseReg,
SDValue &ShReg,
SDValue &Opc,
bool CheckProfitability) {
if (DisableShifterOp)
return false;
ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOpcode());
// Don't match base register only case. That is matched to a separate
// lower complexity pattern with explicit register operand.
if (ShOpcVal == ARM_AM::no_shift) return false;
BaseReg = N.getOperand(0);
unsigned ShImmVal = 0;
ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1));
if (RHS) return false;
ShReg = N.getOperand(1);
if (CheckProfitability && !isShifterOpProfitable(N, ShOpcVal, ShImmVal))
return false;
Opc = CurDAG->getTargetConstant(ARM_AM::getSORegOpc(ShOpcVal, ShImmVal),
SDLoc(N), MVT::i32);
return true;
}
// Determine whether an ISD::OR's operands are suitable to turn the operation
// into an addition, which often has more compact encodings.
bool ARMDAGToDAGISel::SelectAddLikeOr(SDNode *Parent, SDValue N, SDValue &Out) {
assert(Parent->getOpcode() == ISD::OR && "unexpected parent");
Out = N;
return CurDAG->haveNoCommonBitsSet(N, Parent->getOperand(1));
}
bool ARMDAGToDAGISel::SelectAddrModeImm12(SDValue N,
SDValue &Base,
SDValue &OffImm) {
// Match simple R + imm12 operands.
// Base only.
if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB &&
!CurDAG->isBaseWithConstantOffset(N)) {
if (N.getOpcode() == ISD::FrameIndex) {
// Match frame index.
int FI = cast<FrameIndexSDNode>(N)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
if (N.getOpcode() == ARMISD::Wrapper &&
N.getOperand(0).getOpcode() != ISD::TargetGlobalAddress &&
N.getOperand(0).getOpcode() != ISD::TargetExternalSymbol &&
N.getOperand(0).getOpcode() != ISD::TargetGlobalTLSAddress) {
Base = N.getOperand(0);
} else
Base = N;
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getSExtValue();
if (N.getOpcode() == ISD::SUB)
RHSC = -RHSC;
if (RHSC > -0x1000 && RHSC < 0x1000) { // 12 bits
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
}
OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32);
return true;
}
}
// Base only.
Base = N;
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectLdStSOReg(SDValue N, SDValue &Base, SDValue &Offset,
SDValue &Opc) {
if (N.getOpcode() == ISD::MUL &&
((!Subtarget->isLikeA9() && !Subtarget->isSwift()) || N.hasOneUse())) {
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
// X * [3,5,9] -> X + X * [2,4,8] etc.
int RHSC = (int)RHS->getZExtValue();
if (RHSC & 1) {
RHSC = RHSC & ~1;
ARM_AM::AddrOpc AddSub = ARM_AM::add;
if (RHSC < 0) {
AddSub = ARM_AM::sub;
RHSC = - RHSC;
}
if (isPowerOf2_32(RHSC)) {
unsigned ShAmt = Log2_32(RHSC);
Base = Offset = N.getOperand(0);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt,
ARM_AM::lsl),
SDLoc(N), MVT::i32);
return true;
}
}
}
}
if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB &&
// ISD::OR that is equivalent to an ISD::ADD.
!CurDAG->isBaseWithConstantOffset(N))
return false;
// Leave simple R +/- imm12 operands for LDRi12
if (N.getOpcode() == ISD::ADD || N.getOpcode() == ISD::OR) {
int RHSC;
if (isScaledConstantInRange(N.getOperand(1), /*Scale=*/1,
-0x1000+1, 0x1000, RHSC)) // 12 bits.
return false;
}
// Otherwise this is R +/- [possibly shifted] R.
ARM_AM::AddrOpc AddSub = N.getOpcode() == ISD::SUB ? ARM_AM::sub:ARM_AM::add;
ARM_AM::ShiftOpc ShOpcVal =
ARM_AM::getShiftOpcForNode(N.getOperand(1).getOpcode());
unsigned ShAmt = 0;
Base = N.getOperand(0);
Offset = N.getOperand(1);
if (ShOpcVal != ARM_AM::no_shift) {
// Check to see if the RHS of the shift is a constant, if not, we can't fold
// it.
if (ConstantSDNode *Sh =
dyn_cast<ConstantSDNode>(N.getOperand(1).getOperand(1))) {
ShAmt = Sh->getZExtValue();
if (isShifterOpProfitable(Offset, ShOpcVal, ShAmt))
Offset = N.getOperand(1).getOperand(0);
else {
ShAmt = 0;
ShOpcVal = ARM_AM::no_shift;
}
} else {
ShOpcVal = ARM_AM::no_shift;
}
}
// Try matching (R shl C) + (R).
if (N.getOpcode() != ISD::SUB && ShOpcVal == ARM_AM::no_shift &&
!(Subtarget->isLikeA9() || Subtarget->isSwift() ||
N.getOperand(0).hasOneUse())) {
ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOperand(0).getOpcode());
if (ShOpcVal != ARM_AM::no_shift) {
// Check to see if the RHS of the shift is a constant, if not, we can't
// fold it.
if (ConstantSDNode *Sh =
dyn_cast<ConstantSDNode>(N.getOperand(0).getOperand(1))) {
ShAmt = Sh->getZExtValue();
if (isShifterOpProfitable(N.getOperand(0), ShOpcVal, ShAmt)) {
Offset = N.getOperand(0).getOperand(0);
Base = N.getOperand(1);
} else {
ShAmt = 0;
ShOpcVal = ARM_AM::no_shift;
}
} else {
ShOpcVal = ARM_AM::no_shift;
}
}
}
// If Offset is a multiply-by-constant and it's profitable to extract a shift
// and use it in a shifted operand do so.
if (Offset.getOpcode() == ISD::MUL && N.hasOneUse()) {
unsigned PowerOfTwo = 0;
SDValue NewMulConst;
if (canExtractShiftFromMul(Offset, 31, PowerOfTwo, NewMulConst)) {
HandleSDNode Handle(Offset);
replaceDAGValue(Offset.getOperand(1), NewMulConst);
Offset = Handle.getValue();
ShAmt = PowerOfTwo;
ShOpcVal = ARM_AM::lsl;
}
}
Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal),
SDLoc(N), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode2OffsetReg(SDNode *Op, SDValue N,
SDValue &Offset, SDValue &Opc) {
unsigned Opcode = Op->getOpcode();
ISD::MemIndexedMode AM = (Opcode == ISD::LOAD)
? cast<LoadSDNode>(Op)->getAddressingMode()
: cast<StoreSDNode>(Op)->getAddressingMode();
ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC)
? ARM_AM::add : ARM_AM::sub;
int Val;
if (isScaledConstantInRange(N, /*Scale=*/1, 0, 0x1000, Val))
return false;
Offset = N;
ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOpcode());
unsigned ShAmt = 0;
if (ShOpcVal != ARM_AM::no_shift) {
// Check to see if the RHS of the shift is a constant, if not, we can't fold
// it.
if (ConstantSDNode *Sh = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
ShAmt = Sh->getZExtValue();
if (isShifterOpProfitable(N, ShOpcVal, ShAmt))
Offset = N.getOperand(0);
else {
ShAmt = 0;
ShOpcVal = ARM_AM::no_shift;
}
} else {
ShOpcVal = ARM_AM::no_shift;
}
}
Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal),
SDLoc(N), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode2OffsetImmPre(SDNode *Op, SDValue N,
SDValue &Offset, SDValue &Opc) {
unsigned Opcode = Op->getOpcode();
ISD::MemIndexedMode AM = (Opcode == ISD::LOAD)
? cast<LoadSDNode>(Op)->getAddressingMode()
: cast<StoreSDNode>(Op)->getAddressingMode();
ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC)
? ARM_AM::add : ARM_AM::sub;
int Val;
if (isScaledConstantInRange(N, /*Scale=*/1, 0, 0x1000, Val)) { // 12 bits.
if (AddSub == ARM_AM::sub) Val *= -1;
Offset = CurDAG->getRegister(0, MVT::i32);
Opc = CurDAG->getTargetConstant(Val, SDLoc(Op), MVT::i32);
return true;
}
return false;
}
bool ARMDAGToDAGISel::SelectAddrMode2OffsetImm(SDNode *Op, SDValue N,
SDValue &Offset, SDValue &Opc) {
unsigned Opcode = Op->getOpcode();
ISD::MemIndexedMode AM = (Opcode == ISD::LOAD)
? cast<LoadSDNode>(Op)->getAddressingMode()
: cast<StoreSDNode>(Op)->getAddressingMode();
ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC)
? ARM_AM::add : ARM_AM::sub;
int Val;
if (isScaledConstantInRange(N, /*Scale=*/1, 0, 0x1000, Val)) { // 12 bits.
Offset = CurDAG->getRegister(0, MVT::i32);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, Val,
ARM_AM::no_shift),
SDLoc(Op), MVT::i32);
return true;
}
return false;
}
bool ARMDAGToDAGISel::SelectAddrOffsetNone(SDValue N, SDValue &Base) {
Base = N;
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode3(SDValue N,
SDValue &Base, SDValue &Offset,
SDValue &Opc) {
if (N.getOpcode() == ISD::SUB) {
// X - C is canonicalize to X + -C, no need to handle it here.
Base = N.getOperand(0);
Offset = N.getOperand(1);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::sub, 0), SDLoc(N),
MVT::i32);
return true;
}
if (!CurDAG->isBaseWithConstantOffset(N)) {
Base = N;
if (N.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
}
Offset = CurDAG->getRegister(0, MVT::i32);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0), SDLoc(N),
MVT::i32);
return true;
}
// If the RHS is +/- imm8, fold into addr mode.
int RHSC;
if (isScaledConstantInRange(N.getOperand(1), /*Scale=*/1,
-256 + 1, 256, RHSC)) { // 8 bits.
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
}
Offset = CurDAG->getRegister(0, MVT::i32);
ARM_AM::AddrOpc AddSub = ARM_AM::add;
if (RHSC < 0) {
AddSub = ARM_AM::sub;
RHSC = -RHSC;
}
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, RHSC), SDLoc(N),
MVT::i32);
return true;
}
Base = N.getOperand(0);
Offset = N.getOperand(1);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0), SDLoc(N),
MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode3Offset(SDNode *Op, SDValue N,
SDValue &Offset, SDValue &Opc) {
unsigned Opcode = Op->getOpcode();
ISD::MemIndexedMode AM = (Opcode == ISD::LOAD)
? cast<LoadSDNode>(Op)->getAddressingMode()
: cast<StoreSDNode>(Op)->getAddressingMode();
ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC)
? ARM_AM::add : ARM_AM::sub;
int Val;
if (isScaledConstantInRange(N, /*Scale=*/1, 0, 256, Val)) { // 12 bits.
Offset = CurDAG->getRegister(0, MVT::i32);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, Val), SDLoc(Op),
MVT::i32);
return true;
}
Offset = N;
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, 0), SDLoc(Op),
MVT::i32);
return true;
}
bool ARMDAGToDAGISel::IsAddressingMode5(SDValue N, SDValue &Base, SDValue &Offset,
bool FP16) {
if (!CurDAG->isBaseWithConstantOffset(N)) {
Base = N;
if (N.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
} else if (N.getOpcode() == ARMISD::Wrapper &&
N.getOperand(0).getOpcode() != ISD::TargetGlobalAddress &&
N.getOperand(0).getOpcode() != ISD::TargetExternalSymbol &&
N.getOperand(0).getOpcode() != ISD::TargetGlobalTLSAddress) {
Base = N.getOperand(0);
}
Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0),
SDLoc(N), MVT::i32);
return true;
}
// If the RHS is +/- imm8, fold into addr mode.
int RHSC;
const int Scale = FP16 ? 2 : 4;
if (isScaledConstantInRange(N.getOperand(1), Scale, -255, 256, RHSC)) {
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
}
ARM_AM::AddrOpc AddSub = ARM_AM::add;
if (RHSC < 0) {
AddSub = ARM_AM::sub;
RHSC = -RHSC;
}
if (FP16)
Offset = CurDAG->getTargetConstant(ARM_AM::getAM5FP16Opc(AddSub, RHSC),
SDLoc(N), MVT::i32);
else
Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(AddSub, RHSC),
SDLoc(N), MVT::i32);
return true;
}
Base = N;
if (FP16)
Offset = CurDAG->getTargetConstant(ARM_AM::getAM5FP16Opc(ARM_AM::add, 0),
SDLoc(N), MVT::i32);
else
Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0),
SDLoc(N), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode5(SDValue N,
SDValue &Base, SDValue &Offset) {
return IsAddressingMode5(N, Base, Offset, /*FP16=*/ false);
}
bool ARMDAGToDAGISel::SelectAddrMode5FP16(SDValue N,
SDValue &Base, SDValue &Offset) {
return IsAddressingMode5(N, Base, Offset, /*FP16=*/ true);
}
bool ARMDAGToDAGISel::SelectAddrMode6(SDNode *Parent, SDValue N, SDValue &Addr,
SDValue &Align) {
Addr = N;
unsigned Alignment = 0;
MemSDNode *MemN = cast<MemSDNode>(Parent);
if (isa<LSBaseSDNode>(MemN) ||
((MemN->getOpcode() == ARMISD::VST1_UPD ||
MemN->getOpcode() == ARMISD::VLD1_UPD) &&
MemN->getConstantOperandVal(MemN->getNumOperands() - 1) == 1)) {
// This case occurs only for VLD1-lane/dup and VST1-lane instructions.
// The maximum alignment is equal to the memory size being referenced.
unsigned MMOAlign = MemN->getAlignment();
unsigned MemSize = MemN->getMemoryVT().getSizeInBits() / 8;
if (MMOAlign >= MemSize && MemSize > 1)
Alignment = MemSize;
} else {
// All other uses of addrmode6 are for intrinsics. For now just record
// the raw alignment value; it will be refined later based on the legal
// alignment operands for the intrinsic.
Alignment = MemN->getAlignment();
}
Align = CurDAG->getTargetConstant(Alignment, SDLoc(N), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode6Offset(SDNode *Op, SDValue N,
SDValue &Offset) {
LSBaseSDNode *LdSt = cast<LSBaseSDNode>(Op);
ISD::MemIndexedMode AM = LdSt->getAddressingMode();
if (AM != ISD::POST_INC)
return false;
Offset = N;
if (ConstantSDNode *NC = dyn_cast<ConstantSDNode>(N)) {
if (NC->getZExtValue() * 8 == LdSt->getMemoryVT().getSizeInBits())
Offset = CurDAG->getRegister(0, MVT::i32);
}
return true;
}
bool ARMDAGToDAGISel::SelectAddrModePC(SDValue N,
SDValue &Offset, SDValue &Label) {
if (N.getOpcode() == ARMISD::PIC_ADD && N.hasOneUse()) {
Offset = N.getOperand(0);
SDValue N1 = N.getOperand(1);
Label = CurDAG->getTargetConstant(cast<ConstantSDNode>(N1)->getZExtValue(),
SDLoc(N), MVT::i32);
return true;
}
return false;
}
//===----------------------------------------------------------------------===//
// Thumb Addressing Modes
//===----------------------------------------------------------------------===//
static bool shouldUseZeroOffsetLdSt(SDValue N) {
// Negative numbers are difficult to materialise in thumb1. If we are
// selecting the add of a negative, instead try to select ri with a zero
// offset, so create the add node directly which will become a sub.
if (N.getOpcode() != ISD::ADD)
return false;
// Look for an imm which is not legal for ld/st, but is legal for sub.
if (auto C = dyn_cast<ConstantSDNode>(N.getOperand(1)))
return C->getSExtValue() < 0 && C->getSExtValue() >= -255;
return false;
}
bool ARMDAGToDAGISel::SelectThumbAddrModeRRSext(SDValue N, SDValue &Base,
SDValue &Offset) {
if (N.getOpcode() != ISD::ADD && !CurDAG->isBaseWithConstantOffset(N)) {
ConstantSDNode *NC = dyn_cast<ConstantSDNode>(N);
if (!NC || !NC->isNullValue())
return false;
Base = Offset = N;
return true;
}
Base = N.getOperand(0);
Offset = N.getOperand(1);
return true;
}
bool ARMDAGToDAGISel::SelectThumbAddrModeRR(SDValue N, SDValue &Base,
SDValue &Offset) {
if (shouldUseZeroOffsetLdSt(N))
return false; // Select ri instead
return SelectThumbAddrModeRRSext(N, Base, Offset);
}
bool
ARMDAGToDAGISel::SelectThumbAddrModeImm5S(SDValue N, unsigned Scale,
SDValue &Base, SDValue &OffImm) {
if (shouldUseZeroOffsetLdSt(N)) {
Base = N;
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
if (!CurDAG->isBaseWithConstantOffset(N)) {
if (N.getOpcode() == ISD::ADD) {
return false; // We want to select register offset instead
} else if (N.getOpcode() == ARMISD::Wrapper &&
N.getOperand(0).getOpcode() != ISD::TargetGlobalAddress &&
N.getOperand(0).getOpcode() != ISD::TargetExternalSymbol &&
N.getOperand(0).getOpcode() != ISD::TargetConstantPool &&
N.getOperand(0).getOpcode() != ISD::TargetGlobalTLSAddress) {
Base = N.getOperand(0);
} else {
Base = N;
}
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
// If the RHS is + imm5 * scale, fold into addr mode.
int RHSC;
if (isScaledConstantInRange(N.getOperand(1), Scale, 0, 32, RHSC)) {
Base = N.getOperand(0);
OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32);
return true;
}
// Offset is too large, so use register offset instead.
return false;
}
bool
ARMDAGToDAGISel::SelectThumbAddrModeImm5S4(SDValue N, SDValue &Base,
SDValue &OffImm) {
return SelectThumbAddrModeImm5S(N, 4, Base, OffImm);
}
bool
ARMDAGToDAGISel::SelectThumbAddrModeImm5S2(SDValue N, SDValue &Base,
SDValue &OffImm) {
return SelectThumbAddrModeImm5S(N, 2, Base, OffImm);
}
bool
ARMDAGToDAGISel::SelectThumbAddrModeImm5S1(SDValue N, SDValue &Base,
SDValue &OffImm) {
return SelectThumbAddrModeImm5S(N, 1, Base, OffImm);
}
bool ARMDAGToDAGISel::SelectThumbAddrModeSP(SDValue N,
SDValue &Base, SDValue &OffImm) {
if (N.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
// Only multiples of 4 are allowed for the offset, so the frame object
// alignment must be at least 4.
MachineFrameInfo &MFI = MF->getFrameInfo();
if (MFI.getObjectAlignment(FI) < 4)
MFI.setObjectAlignment(FI, 4);
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
if (!CurDAG->isBaseWithConstantOffset(N))
return false;
if (N.getOperand(0).getOpcode() == ISD::FrameIndex) {
// If the RHS is + imm8 * scale, fold into addr mode.
int RHSC;
if (isScaledConstantInRange(N.getOperand(1), /*Scale=*/4, 0, 256, RHSC)) {
Base = N.getOperand(0);
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
// Make sure the offset is inside the object, or we might fail to
// allocate an emergency spill slot. (An out-of-range access is UB, but
// it could show up anyway.)
MachineFrameInfo &MFI = MF->getFrameInfo();
if (RHSC * 4 < MFI.getObjectSize(FI)) {
// For LHS+RHS to result in an offset that's a multiple of 4 the object
// indexed by the LHS must be 4-byte aligned.
if (!MFI.isFixedObjectIndex(FI) && MFI.getObjectAlignment(FI) < 4)
MFI.setObjectAlignment(FI, 4);
if (MFI.getObjectAlignment(FI) >= 4) {
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32);
return true;
}
}
}
}
return false;
}
template <unsigned Shift>
bool ARMDAGToDAGISel::SelectTAddrModeImm7(SDValue N, SDValue &Base,
SDValue &OffImm) {
if (N.getOpcode() == ISD::SUB || CurDAG->isBaseWithConstantOffset(N)) {
int RHSC;
if (isScaledConstantInRange(N.getOperand(1), 1 << Shift, -0x7f, 0x80,
RHSC)) {
Base = N.getOperand(0);
if (N.getOpcode() == ISD::SUB)
RHSC = -RHSC;
OffImm =
CurDAG->getTargetConstant(RHSC * (1 << Shift), SDLoc(N), MVT::i32);
return true;
}
}
// Base only.
Base = N;
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
//===----------------------------------------------------------------------===//
// Thumb 2 Addressing Modes
//===----------------------------------------------------------------------===//
bool ARMDAGToDAGISel::SelectT2AddrModeImm12(SDValue N,
SDValue &Base, SDValue &OffImm) {
// Match simple R + imm12 operands.
// Base only.
if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB &&
!CurDAG->isBaseWithConstantOffset(N)) {
if (N.getOpcode() == ISD::FrameIndex) {
// Match frame index.
int FI = cast<FrameIndexSDNode>(N)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
if (N.getOpcode() == ARMISD::Wrapper &&
N.getOperand(0).getOpcode() != ISD::TargetGlobalAddress &&
N.getOperand(0).getOpcode() != ISD::TargetExternalSymbol &&
N.getOperand(0).getOpcode() != ISD::TargetGlobalTLSAddress) {
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::TargetConstantPool)
return false; // We want to select t2LDRpci instead.
} else
Base = N;
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
if (SelectT2AddrModeImm8(N, Base, OffImm))
// Let t2LDRi8 handle (R - imm8).
return false;
int RHSC = (int)RHS->getZExtValue();
if (N.getOpcode() == ISD::SUB)
RHSC = -RHSC;
if (RHSC >= 0 && RHSC < 0x1000) { // 12 bits (unsigned)
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
}
OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32);
return true;
}
}
// Base only.
Base = N;
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectT2AddrModeImm8(SDValue N,
SDValue &Base, SDValue &OffImm) {
// Match simple R - imm8 operands.
if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB &&
!CurDAG->isBaseWithConstantOffset(N))
return false;
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getSExtValue();
if (N.getOpcode() == ISD::SUB)
RHSC = -RHSC;
if ((RHSC >= -255) && (RHSC < 0)) { // 8 bits (always negative)
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
}
OffImm = CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32);
return true;
}
}
return false;
}
bool ARMDAGToDAGISel::SelectT2AddrModeImm8Offset(SDNode *Op, SDValue N,
SDValue &OffImm){
unsigned Opcode = Op->getOpcode();
ISD::MemIndexedMode AM = (Opcode == ISD::LOAD)
? cast<LoadSDNode>(Op)->getAddressingMode()
: cast<StoreSDNode>(Op)->getAddressingMode();
int RHSC;
if (isScaledConstantInRange(N, /*Scale=*/1, 0, 0x100, RHSC)) { // 8 bits.
OffImm = ((AM == ISD::PRE_INC) || (AM == ISD::POST_INC))
? CurDAG->getTargetConstant(RHSC, SDLoc(N), MVT::i32)
: CurDAG->getTargetConstant(-RHSC, SDLoc(N), MVT::i32);
return true;
}
return false;
}
template <unsigned Shift>
bool ARMDAGToDAGISel::SelectT2AddrModeImm7(SDValue N, SDValue &Base,
SDValue &OffImm) {
if (N.getOpcode() == ISD::SUB || CurDAG->isBaseWithConstantOffset(N)) {
int RHSC;
if (isScaledConstantInRange(N.getOperand(1), 1 << Shift, -0x7f, 0x80,
RHSC)) {
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
}
if (N.getOpcode() == ISD::SUB)
RHSC = -RHSC;
OffImm =
CurDAG->getTargetConstant(RHSC * (1 << Shift), SDLoc(N), MVT::i32);
return true;
}
}
// Base only.
Base = N;
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
return true;
}
template <unsigned Shift>
bool ARMDAGToDAGISel::SelectT2AddrModeImm7Offset(SDNode *Op, SDValue N,
SDValue &OffImm) {
return SelectT2AddrModeImm7Offset(Op, N, OffImm, Shift);
}
bool ARMDAGToDAGISel::SelectT2AddrModeImm7Offset(SDNode *Op, SDValue N,
SDValue &OffImm,
unsigned Shift) {
unsigned Opcode = Op->getOpcode();
ISD::MemIndexedMode AM;
switch (Opcode) {
case ISD::LOAD:
AM = cast<LoadSDNode>(Op)->getAddressingMode();
break;
case ISD::STORE:
AM = cast<StoreSDNode>(Op)->getAddressingMode();
break;
case ISD::MLOAD:
AM = cast<MaskedLoadSDNode>(Op)->getAddressingMode();
break;
case ISD::MSTORE:
AM = cast<MaskedStoreSDNode>(Op)->getAddressingMode();
break;
default:
llvm_unreachable("Unexpected Opcode for Imm7Offset");
}
int RHSC;
// 7 bit constant, shifted by Shift.
if (isScaledConstantInRange(N, 1 << Shift, 0, 0x80, RHSC)) {
OffImm =
((AM == ISD::PRE_INC) || (AM == ISD::POST_INC))
? CurDAG->getTargetConstant(RHSC * (1 << Shift), SDLoc(N), MVT::i32)
: CurDAG->getTargetConstant(-RHSC * (1 << Shift), SDLoc(N),
MVT::i32);
return true;
}
return false;
}
template <int Min, int Max>
bool ARMDAGToDAGISel::SelectImmediateInRange(SDValue N, SDValue &OffImm) {
int Val;
if (isScaledConstantInRange(N, 1, Min, Max, Val)) {
OffImm = CurDAG->getTargetConstant(Val, SDLoc(N), MVT::i32);
return true;
}
return false;
}
bool ARMDAGToDAGISel::SelectT2AddrModeSoReg(SDValue N,
SDValue &Base,
SDValue &OffReg, SDValue &ShImm) {
// (R - imm8) should be handled by t2LDRi8. The rest are handled by t2LDRi12.
if (N.getOpcode() != ISD::ADD && !CurDAG->isBaseWithConstantOffset(N))
return false;
// Leave (R + imm12) for t2LDRi12, (R - imm8) for t2LDRi8.
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getZExtValue();
if (RHSC >= 0 && RHSC < 0x1000) // 12 bits (unsigned)
return false;
else if (RHSC < 0 && RHSC >= -255) // 8 bits
return false;
}
// Look for (R + R) or (R + (R << [1,2,3])).
unsigned ShAmt = 0;
Base = N.getOperand(0);
OffReg = N.getOperand(1);
// Swap if it is ((R << c) + R).
ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(OffReg.getOpcode());
if (ShOpcVal != ARM_AM::lsl) {
ShOpcVal = ARM_AM::getShiftOpcForNode(Base.getOpcode());
if (ShOpcVal == ARM_AM::lsl)
std::swap(Base, OffReg);
}
if (ShOpcVal == ARM_AM::lsl) {
// Check to see if the RHS of the shift is a constant, if not, we can't fold
// it.
if (ConstantSDNode *Sh = dyn_cast<ConstantSDNode>(OffReg.getOperand(1))) {
ShAmt = Sh->getZExtValue();
if (ShAmt < 4 && isShifterOpProfitable(OffReg, ShOpcVal, ShAmt))
OffReg = OffReg.getOperand(0);
else {
ShAmt = 0;
}
}
}
// If OffReg is a multiply-by-constant and it's profitable to extract a shift
// and use it in a shifted operand do so.
if (OffReg.getOpcode() == ISD::MUL && N.hasOneUse()) {
unsigned PowerOfTwo = 0;
SDValue NewMulConst;
if (canExtractShiftFromMul(OffReg, 3, PowerOfTwo, NewMulConst)) {
HandleSDNode Handle(OffReg);
replaceDAGValue(OffReg.getOperand(1), NewMulConst);
OffReg = Handle.getValue();
ShAmt = PowerOfTwo;
}
}
ShImm = CurDAG->getTargetConstant(ShAmt, SDLoc(N), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectT2AddrModeExclusive(SDValue N, SDValue &Base,
SDValue &OffImm) {
// This *must* succeed since it's used for the irreplaceable ldrex and strex
// instructions.
Base = N;
OffImm = CurDAG->getTargetConstant(0, SDLoc(N), MVT::i32);
if (N.getOpcode() != ISD::ADD || !CurDAG->isBaseWithConstantOffset(N))
return true;
ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1));
if (!RHS)
return true;
uint32_t RHSC = (int)RHS->getZExtValue();
if (RHSC > 1020 || RHSC % 4 != 0)
return true;
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(
FI, TLI->getPointerTy(CurDAG->getDataLayout()));
}
OffImm = CurDAG->getTargetConstant(RHSC/4, SDLoc(N), MVT::i32);
return true;
}
//===--------------------------------------------------------------------===//
/// getAL - Returns a ARMCC::AL immediate node.
static inline SDValue getAL(SelectionDAG *CurDAG, const SDLoc &dl) {
return CurDAG->getTargetConstant((uint64_t)ARMCC::AL, dl, MVT::i32);
}
void ARMDAGToDAGISel::transferMemOperands(SDNode *N, SDNode *Result) {
MachineMemOperand *MemOp = cast<MemSDNode>(N)->getMemOperand();
CurDAG->setNodeMemRefs(cast<MachineSDNode>(Result), {MemOp});
}
bool ARMDAGToDAGISel::tryARMIndexedLoad(SDNode *N) {
LoadSDNode *LD = cast<LoadSDNode>(N);
ISD::MemIndexedMode AM = LD->getAddressingMode();
if (AM == ISD::UNINDEXED)
return false;
EVT LoadedVT = LD->getMemoryVT();
SDValue Offset, AMOpc;
bool isPre = (AM == ISD::PRE_INC) || (AM == ISD::PRE_DEC);
unsigned Opcode = 0;
bool Match = false;
if (LoadedVT == MVT::i32 && isPre &&
SelectAddrMode2OffsetImmPre(N, LD->getOffset(), Offset, AMOpc)) {
Opcode = ARM::LDR_PRE_IMM;
Match = true;
} else if (LoadedVT == MVT::i32 && !isPre &&
SelectAddrMode2OffsetImm(N, LD->getOffset(), Offset, AMOpc)) {
Opcode = ARM::LDR_POST_IMM;
Match = true;
} else if (LoadedVT == MVT::i32 &&
SelectAddrMode2OffsetReg(N, LD->getOffset(), Offset, AMOpc)) {
Opcode = isPre ? ARM::LDR_PRE_REG : ARM::LDR_POST_REG;
Match = true;
} else if (LoadedVT == MVT::i16 &&
SelectAddrMode3Offset(N, LD->getOffset(), Offset, AMOpc)) {
Match = true;
Opcode = (LD->getExtensionType() == ISD::SEXTLOAD)
? (isPre ? ARM::LDRSH_PRE : ARM::LDRSH_POST)
: (isPre ? ARM::LDRH_PRE : ARM::LDRH_POST);
} else if (LoadedVT == MVT::i8 || LoadedVT == MVT::i1) {
if (LD->getExtensionType() == ISD::SEXTLOAD) {
if (SelectAddrMode3Offset(N, LD->getOffset(), Offset, AMOpc)) {
Match = true;
Opcode = isPre ? ARM::LDRSB_PRE : ARM::LDRSB_POST;
}
} else {
if (isPre &&
SelectAddrMode2OffsetImmPre(N, LD->getOffset(), Offset, AMOpc)) {
Match = true;
Opcode = ARM::LDRB_PRE_IMM;
} else if (!isPre &&
SelectAddrMode2OffsetImm(N, LD->getOffset(), Offset, AMOpc)) {
Match = true;
Opcode = ARM::LDRB_POST_IMM;
} else if (SelectAddrMode2OffsetReg(N, LD->getOffset(), Offset, AMOpc)) {
Match = true;
Opcode = isPre ? ARM::LDRB_PRE_REG : ARM::LDRB_POST_REG;
}
}
}
if (Match) {
if (Opcode == ARM::LDR_PRE_IMM || Opcode == ARM::LDRB_PRE_IMM) {
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Ops[]= { Base, AMOpc, getAL(CurDAG, SDLoc(N)),
CurDAG->getRegister(0, MVT::i32), Chain };
SDNode *New = CurDAG->getMachineNode(Opcode, SDLoc(N), MVT::i32, MVT::i32,
MVT::Other, Ops);
transferMemOperands(N, New);
ReplaceNode(N, New);
return true;
} else {
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Ops[]= { Base, Offset, AMOpc, getAL(CurDAG, SDLoc(N)),
CurDAG->getRegister(0, MVT::i32), Chain };
SDNode *New = CurDAG->getMachineNode(Opcode, SDLoc(N), MVT::i32, MVT::i32,
MVT::Other, Ops);
transferMemOperands(N, New);
ReplaceNode(N, New);
return true;
}
}
return false;
}
bool ARMDAGToDAGISel::tryT1IndexedLoad(SDNode *N) {
LoadSDNode *LD = cast<LoadSDNode>(N);
EVT LoadedVT = LD->getMemoryVT();
ISD::MemIndexedMode AM = LD->getAddressingMode();
if (AM != ISD::POST_INC || LD->getExtensionType() != ISD::NON_EXTLOAD ||
LoadedVT.getSimpleVT().SimpleTy != MVT::i32)
return false;
auto *COffs = dyn_cast<ConstantSDNode>(LD->getOffset());
if (!COffs || COffs->getZExtValue() != 4)
return false;
// A T1 post-indexed load is just a single register LDM: LDM r0!, {r1}.
// The encoding of LDM is not how the rest of ISel expects a post-inc load to
// look however, so we use a pseudo here and switch it for a tLDMIA_UPD after
// ISel.
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Ops[]= { Base, getAL(CurDAG, SDLoc(N)),
CurDAG->getRegister(0, MVT::i32), Chain };
SDNode *New = CurDAG->getMachineNode(ARM::tLDR_postidx, SDLoc(N), MVT::i32,
MVT::i32, MVT::Other, Ops);
transferMemOperands(N, New);
ReplaceNode(N, New);
return true;
}
bool ARMDAGToDAGISel::tryT2IndexedLoad(SDNode *N) {
LoadSDNode *LD = cast<LoadSDNode>(N);
ISD::MemIndexedMode AM = LD->getAddressingMode();
if (AM == ISD::UNINDEXED)
return false;
EVT LoadedVT = LD->getMemoryVT();
bool isSExtLd = LD->getExtensionType() == ISD::SEXTLOAD;
SDValue Offset;
bool isPre = (AM == ISD::PRE_INC) || (AM == ISD::PRE_DEC);
unsigned Opcode = 0;
bool Match = false;
if (SelectT2AddrModeImm8Offset(N, LD->getOffset(), Offset)) {
switch (LoadedVT.getSimpleVT().SimpleTy) {
case MVT::i32:
Opcode = isPre ? ARM::t2LDR_PRE : ARM::t2LDR_POST;
break;
case MVT::i16:
if (isSExtLd)
Opcode = isPre ? ARM::t2LDRSH_PRE : ARM::t2LDRSH_POST;
else
Opcode = isPre ? ARM::t2LDRH_PRE : ARM::t2LDRH_POST;
break;
case MVT::i8:
case MVT::i1:
if (isSExtLd)
Opcode = isPre ? ARM::t2LDRSB_PRE : ARM::t2LDRSB_POST;
else
Opcode = isPre ? ARM::t2LDRB_PRE : ARM::t2LDRB_POST;
break;
default:
return false;
}
Match = true;
}
if (Match) {
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Ops[]= { Base, Offset, getAL(CurDAG, SDLoc(N)),
CurDAG->getRegister(0, MVT::i32), Chain };
SDNode *New = CurDAG->getMachineNode(Opcode, SDLoc(N), MVT::i32, MVT::i32,
MVT::Other, Ops);
transferMemOperands(N, New);
ReplaceNode(N, New);
return true;
}
return false;
}
bool ARMDAGToDAGISel::tryMVEIndexedLoad(SDNode *N) {
EVT LoadedVT;
unsigned Opcode = 0;
bool isSExtLd, isPre;
unsigned Align;
ARMVCC::VPTCodes Pred;
SDValue PredReg;
SDValue Chain, Base, Offset;
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
ISD::MemIndexedMode AM = LD->getAddressingMode();
if (AM == ISD::UNINDEXED)
return false;
LoadedVT = LD->getMemoryVT();
if (!LoadedVT.isVector())
return false;
Chain = LD->getChain();
Base = LD->getBasePtr();
Offset = LD->getOffset();
Align = LD->getAlignment();
isSExtLd = LD->getExtensionType() == ISD::SEXTLOAD;
isPre = (AM == ISD::PRE_INC) || (AM == ISD::PRE_DEC);
Pred = ARMVCC::None;
PredReg = CurDAG->getRegister(0, MVT::i32);
} else if (MaskedLoadSDNode *LD = dyn_cast<MaskedLoadSDNode>(N)) {
ISD::MemIndexedMode AM = LD->getAddressingMode();
if (AM == ISD::UNINDEXED)
return false;
LoadedVT = LD->getMemoryVT();
if (!LoadedVT.isVector())
return false;
Chain = LD->getChain();
Base = LD->getBasePtr();
Offset = LD->getOffset();
Align = LD->getAlignment();
isSExtLd = LD->getExtensionType() == ISD::SEXTLOAD;
isPre = (AM == ISD::PRE_INC) || (AM == ISD::PRE_DEC);
Pred = ARMVCC::Then;
PredReg = LD->getMask();
} else
llvm_unreachable("Expected a Load or a Masked Load!");
// We allow LE non-masked loads to change the type (for example use a vldrb.8
// as opposed to a vldrw.32). This can allow extra addressing modes or
// alignments for what is otherwise an equivalent instruction.
bool CanChangeType = Subtarget->isLittle() && !isa<MaskedLoadSDNode>(N);
SDValue NewOffset;
if (Align >= 2 && LoadedVT == MVT::v4i16 &&
SelectT2AddrModeImm7Offset(N, Offset, NewOffset, 1)) {
if (isSExtLd)
Opcode = isPre ? ARM::MVE_VLDRHS32_pre : ARM::MVE_VLDRHS32_post;
else
Opcode = isPre ? ARM::MVE_VLDRHU32_pre : ARM::MVE_VLDRHU32_post;
} else if (LoadedVT == MVT::v8i8 &&
SelectT2AddrModeImm7Offset(N, Offset, NewOffset, 0)) {
if (isSExtLd)
Opcode = isPre ? ARM::MVE_VLDRBS16_pre : ARM::MVE_VLDRBS16_post;
else
Opcode = isPre ? ARM::MVE_VLDRBU16_pre : ARM::MVE_VLDRBU16_post;
} else if (LoadedVT == MVT::v4i8 &&
SelectT2AddrModeImm7Offset(N, Offset, NewOffset, 0)) {
if (isSExtLd)
Opcode = isPre ? ARM::MVE_VLDRBS32_pre : ARM::MVE_VLDRBS32_post;
else
Opcode = isPre ? ARM::MVE_VLDRBU32_pre : ARM::MVE_VLDRBU32_post;
} else if (Align >= 4 &&
(CanChangeType || LoadedVT == MVT::v4i32 ||
LoadedVT == MVT::v4f32) &&
SelectT2AddrModeImm7Offset(N, Offset, NewOffset, 2))
Opcode = isPre ? ARM::MVE_VLDRWU32_pre : ARM::MVE_VLDRWU32_post;
else if (Align >= 2 &&
(CanChangeType || LoadedVT == MVT::v8i16 ||
LoadedVT == MVT::v8f16) &&
SelectT2AddrModeImm7Offset(N, Offset, NewOffset, 1))
Opcode = isPre ? ARM::MVE_VLDRHU16_pre : ARM::MVE_VLDRHU16_post;
else if ((CanChangeType || LoadedVT == MVT::v16i8) &&
SelectT2AddrModeImm7Offset(N, Offset, NewOffset, 0))
Opcode = isPre ? ARM::MVE_VLDRBU8_pre : ARM::MVE_VLDRBU8_post;
else
return false;
SDValue Ops[] = {Base, NewOffset,
CurDAG->getTargetConstant(Pred, SDLoc(N), MVT::i32), PredReg,
Chain};
SDNode *New = CurDAG->getMachineNode(Opcode, SDLoc(N), N->getValueType(0),
MVT::i32, MVT::Other, Ops);
transferMemOperands(N, New);
ReplaceUses(SDValue(N, 0), SDValue(New, 1));
ReplaceUses(SDValue(N, 1), SDValue(New, 0));
ReplaceUses(SDValue(N, 2), SDValue(New, 2));
CurDAG->RemoveDeadNode(N);
return true;
}
/// Form a GPRPair pseudo register from a pair of GPR regs.
SDNode *ARMDAGToDAGISel::createGPRPairNode(EVT VT, SDValue V0, SDValue V1) {
SDLoc dl(V0.getNode());
SDValue RegClass =
CurDAG->getTargetConstant(ARM::GPRPairRegClassID, dl, MVT::i32);
SDValue SubReg0 = CurDAG->getTargetConstant(ARM::gsub_0, dl, MVT::i32);
SDValue SubReg1 = CurDAG->getTargetConstant(ARM::gsub_1, dl, MVT::i32);
const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1 };
return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops);
}
/// Form a D register from a pair of S registers.
SDNode *ARMDAGToDAGISel::createSRegPairNode(EVT VT, SDValue V0, SDValue V1) {
SDLoc dl(V0.getNode());
SDValue RegClass =
CurDAG->getTargetConstant(ARM::DPR_VFP2RegClassID, dl, MVT::i32);
SDValue SubReg0 = CurDAG->getTargetConstant(ARM::ssub_0, dl, MVT::i32);
SDValue SubReg1 = CurDAG->getTargetConstant(ARM::ssub_1, dl, MVT::i32);
const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1 };
return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops);
}
/// Form a quad register from a pair of D registers.
SDNode *ARMDAGToDAGISel::createDRegPairNode(EVT VT, SDValue V0, SDValue V1) {
SDLoc dl(V0.getNode());
SDValue RegClass = CurDAG->getTargetConstant(ARM::QPRRegClassID, dl,
MVT::i32);
SDValue SubReg0 = CurDAG->getTargetConstant(ARM::dsub_0, dl, MVT::i32);
SDValue SubReg1 = CurDAG->getTargetConstant(ARM::dsub_1, dl, MVT::i32);
const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1 };
return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops);
}
/// Form 4 consecutive D registers from a pair of Q registers.
SDNode *ARMDAGToDAGISel::createQRegPairNode(EVT VT, SDValue V0, SDValue V1) {
SDLoc dl(V0.getNode());
SDValue RegClass = CurDAG->getTargetConstant(ARM::QQPRRegClassID, dl,
MVT::i32);
SDValue SubReg0 = CurDAG->getTargetConstant(ARM::qsub_0, dl, MVT::i32);
SDValue SubReg1 = CurDAG->getTargetConstant(ARM::qsub_1, dl, MVT::i32);
const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1 };
return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops);
}
/// Form 4 consecutive S registers.
SDNode *ARMDAGToDAGISel::createQuadSRegsNode(EVT VT, SDValue V0, SDValue V1,
SDValue V2, SDValue V3) {
SDLoc dl(V0.getNode());
SDValue RegClass =
CurDAG->getTargetConstant(ARM::QPR_VFP2RegClassID, dl, MVT::i32);
SDValue SubReg0 = CurDAG->getTargetConstant(ARM::ssub_0, dl, MVT::i32);
SDValue SubReg1 = CurDAG->getTargetConstant(ARM::ssub_1, dl, MVT::i32);
SDValue SubReg2 = CurDAG->getTargetConstant(ARM::ssub_2, dl, MVT::i32);
SDValue SubReg3 = CurDAG->getTargetConstant(ARM::ssub_3, dl, MVT::i32);
const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1,
V2, SubReg2, V3, SubReg3 };
return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops);
}
/// Form 4 consecutive D registers.
SDNode *ARMDAGToDAGISel::createQuadDRegsNode(EVT VT, SDValue V0, SDValue V1,
SDValue V2, SDValue V3) {
SDLoc dl(V0.getNode());
SDValue RegClass = CurDAG->getTargetConstant(ARM::QQPRRegClassID, dl,
MVT::i32);
SDValue SubReg0 = CurDAG->getTargetConstant(ARM::dsub_0, dl, MVT::i32);
SDValue SubReg1 = CurDAG->getTargetConstant(ARM::dsub_1, dl, MVT::i32);
SDValue SubReg2 = CurDAG->getTargetConstant(ARM::dsub_2, dl, MVT::i32);
SDValue SubReg3 = CurDAG->getTargetConstant(ARM::dsub_3, dl, MVT::i32);
const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1,
V2, SubReg2, V3, SubReg3 };
return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops);
}
/// Form 4 consecutive Q registers.
SDNode *ARMDAGToDAGISel::createQuadQRegsNode(EVT VT, SDValue V0, SDValue V1,
SDValue V2, SDValue V3) {
SDLoc dl(V0.getNode());
SDValue RegClass = CurDAG->getTargetConstant(ARM::QQQQPRRegClassID, dl,
MVT::i32);
SDValue SubReg0 = CurDAG->getTargetConstant(ARM::qsub_0, dl, MVT::i32);
SDValue SubReg1 = CurDAG->getTargetConstant(ARM::qsub_1, dl, MVT::i32);
SDValue SubReg2 = CurDAG->getTargetConstant(ARM::qsub_2, dl, MVT::i32);
SDValue SubReg3 = CurDAG->getTargetConstant(ARM::qsub_3, dl, MVT::i32);
const SDValue Ops[] = { RegClass, V0, SubReg0, V1, SubReg1,
V2, SubReg2, V3, SubReg3 };
return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, dl, VT, Ops);
}
/// GetVLDSTAlign - Get the alignment (in bytes) for the alignment operand
/// of a NEON VLD or VST instruction. The supported values depend on the
/// number of registers being loaded.
SDValue ARMDAGToDAGISel::GetVLDSTAlign(SDValue Align, const SDLoc &dl,
unsigned NumVecs, bool is64BitVector) {
unsigned NumRegs = NumVecs;
if (!is64BitVector && NumVecs < 3)
NumRegs *= 2;
unsigned Alignment = cast<ConstantSDNode>(Align)->getZExtValue();
if (Alignment >= 32 && NumRegs == 4)
Alignment = 32;
else if (Alignment >= 16 && (NumRegs == 2 || NumRegs == 4))
Alignment = 16;
else if (Alignment >= 8)
Alignment = 8;
else
Alignment = 0;
return CurDAG->getTargetConstant(Alignment, dl, MVT::i32);
}
static bool isVLDfixed(unsigned Opc)
{
switch (Opc) {
default: return false;
case ARM::VLD1d8wb_fixed : return true;
case ARM::VLD1d16wb_fixed : return true;
case ARM::VLD1d64Qwb_fixed : return true;
case ARM::VLD1d32wb_fixed : return true;
case ARM::VLD1d64wb_fixed : return true;
case ARM::VLD1d64TPseudoWB_fixed : return true;
case ARM::VLD1d64QPseudoWB_fixed : return true;
case ARM::VLD1q8wb_fixed : return true;
case ARM::VLD1q16wb_fixed : return true;
case ARM::VLD1q32wb_fixed : return true;
case ARM::VLD1q64wb_fixed : return true;
case ARM::VLD1DUPd8wb_fixed : return true;
case ARM::VLD1DUPd16wb_fixed : return true;
case ARM::VLD1DUPd32wb_fixed : return true;
case ARM::VLD1DUPq8wb_fixed : return true;
case ARM::VLD1DUPq16wb_fixed : return true;
case ARM::VLD1DUPq32wb_fixed : return true;
case ARM::VLD2d8wb_fixed : return true;
case ARM::VLD2d16wb_fixed : return true;
case ARM::VLD2d32wb_fixed : return true;
case ARM::VLD2q8PseudoWB_fixed : return true;
case ARM::VLD2q16PseudoWB_fixed : return true;
case ARM::VLD2q32PseudoWB_fixed : return true;
case ARM::VLD2DUPd8wb_fixed : return true;
case ARM::VLD2DUPd16wb_fixed : return true;
case ARM::VLD2DUPd32wb_fixed : return true;
}
}
static bool isVSTfixed(unsigned Opc)
{
switch (Opc) {
default: return false;
case ARM::VST1d8wb_fixed : return true;
case ARM::VST1d16wb_fixed : return true;
case ARM::VST1d32wb_fixed : return true;
case ARM::VST1d64wb_fixed : return true;
case ARM::VST1q8wb_fixed : return true;
case ARM::VST1q16wb_fixed : return true;
case ARM::VST1q32wb_fixed : return true;
case ARM::VST1q64wb_fixed : return true;
case ARM::VST1d64TPseudoWB_fixed : return true;
case ARM::VST1d64QPseudoWB_fixed : return true;
case ARM::VST2d8wb_fixed : return true;
case ARM::VST2d16wb_fixed : return true;
case ARM::VST2d32wb_fixed : return true;
case ARM::VST2q8PseudoWB_fixed : return true;
case ARM::VST2q16PseudoWB_fixed : return true;
case ARM::VST2q32PseudoWB_fixed : return true;
}
}
// Get the register stride update opcode of a VLD/VST instruction that
// is otherwise equivalent to the given fixed stride updating instruction.
static unsigned getVLDSTRegisterUpdateOpcode(unsigned Opc) {
assert((isVLDfixed(Opc) || isVSTfixed(Opc))
&& "Incorrect fixed stride updating instruction.");
switch (Opc) {
default: break;
case ARM::VLD1d8wb_fixed: return ARM::VLD1d8wb_register;
case ARM::VLD1d16wb_fixed: return ARM::VLD1d16wb_register;
case ARM::VLD1d32wb_fixed: return ARM::VLD1d32wb_register;
case ARM::VLD1d64wb_fixed: return ARM::VLD1d64wb_register;
case ARM::VLD1q8wb_fixed: return ARM::VLD1q8wb_register;
case ARM::VLD1q16wb_fixed: return ARM::VLD1q16wb_register;
case ARM::VLD1q32wb_fixed: return ARM::VLD1q32wb_register;
case ARM::VLD1q64wb_fixed: return ARM::VLD1q64wb_register;
case ARM::VLD1d64Twb_fixed: return ARM::VLD1d64Twb_register;
case ARM::VLD1d64Qwb_fixed: return ARM::VLD1d64Qwb_register;
case ARM::VLD1d64TPseudoWB_fixed: return ARM::VLD1d64TPseudoWB_register;
case ARM::VLD1d64QPseudoWB_fixed: return ARM::VLD1d64QPseudoWB_register;
case ARM::VLD1DUPd8wb_fixed : return ARM::VLD1DUPd8wb_register;
case ARM::VLD1DUPd16wb_fixed : return ARM::VLD1DUPd16wb_register;
case ARM::VLD1DUPd32wb_fixed : return ARM::VLD1DUPd32wb_register;
case ARM::VLD1DUPq8wb_fixed : return ARM::VLD1DUPq8wb_register;
case ARM::VLD1DUPq16wb_fixed : return ARM::VLD1DUPq16wb_register;
case ARM::VLD1DUPq32wb_fixed : return ARM::VLD1DUPq32wb_register;
case ARM::VST1d8wb_fixed: return ARM::VST1d8wb_register;
case ARM::VST1d16wb_fixed: return ARM::VST1d16wb_register;
case ARM::VST1d32wb_fixed: return ARM::VST1d32wb_register;
case ARM::VST1d64wb_fixed: return ARM::VST1d64wb_register;
case ARM::VST1q8wb_fixed: return ARM::VST1q8wb_register;
case ARM::VST1q16wb_fixed: return ARM::VST1q16wb_register;
case ARM::VST1q32wb_fixed: return ARM::VST1q32wb_register;
case ARM::VST1q64wb_fixed: return ARM::VST1q64wb_register;
case ARM::VST1d64TPseudoWB_fixed: return ARM::VST1d64TPseudoWB_register;
case ARM::VST1d64QPseudoWB_fixed: return ARM::VST1d64QPseudoWB_register;
case ARM::VLD2d8wb_fixed: return ARM::VLD2d8wb_register;
case ARM::VLD2d16wb_fixed: return ARM::VLD2d16wb_register;
case ARM::VLD2d32wb_fixed: return ARM::VLD2d32wb_register;
case ARM::VLD2q8PseudoWB_fixed: return ARM::VLD2q8PseudoWB_register;
case ARM::VLD2q16PseudoWB_fixed: return ARM::VLD2q16PseudoWB_register;
case ARM::VLD2q32PseudoWB_fixed: return ARM::VLD2q32PseudoWB_register;
case ARM::VST2d8wb_fixed: return ARM::VST2d8wb_register;
case ARM::VST2d16wb_fixed: return ARM::VST2d16wb_register;
case ARM::VST2d32wb_fixed: return ARM::VST2d32wb_register;
case ARM::VST2q8PseudoWB_fixed: return ARM::VST2q8PseudoWB_register;
case ARM::VST2q16PseudoWB_fixed: return ARM::VST2q16PseudoWB_register;
case ARM::VST2q32PseudoWB_fixed: return ARM::VST2q32PseudoWB_register;
case ARM::VLD2DUPd8wb_fixed: return ARM::VLD2DUPd8wb_register;
case ARM::VLD2DUPd16wb_fixed: return ARM::VLD2DUPd16wb_register;
case ARM::VLD2DUPd32wb_fixed: return ARM::VLD2DUPd32wb_register;
}
return Opc; // If not one we handle, return it unchanged.
}
/// Returns true if the given increment is a Constant known to be equal to the
/// access size performed by a NEON load/store. This means the "[rN]!" form can
/// be used.
static bool isPerfectIncrement(SDValue Inc, EVT VecTy, unsigned NumVecs) {
auto C = dyn_cast<ConstantSDNode>(Inc);
return C && C->getZExtValue() == VecTy.getSizeInBits() / 8 * NumVecs;
}
void ARMDAGToDAGISel::SelectVLD(SDNode *N, bool isUpdating, unsigned NumVecs,
const uint16_t *DOpcodes,
const uint16_t *QOpcodes0,
const uint16_t *QOpcodes1) {
assert(NumVecs >= 1 && NumVecs <= 4 && "VLD NumVecs out-of-range");
SDLoc dl(N);
SDValue MemAddr, Align;
bool IsIntrinsic = !isUpdating; // By coincidence, all supported updating
// nodes are not intrinsics.
unsigned AddrOpIdx = IsIntrinsic ? 2 : 1;
if (!SelectAddrMode6(N, N->getOperand(AddrOpIdx), MemAddr, Align))
return;
SDValue Chain = N->getOperand(0);
EVT VT = N->getValueType(0);
bool is64BitVector = VT.is64BitVector();
Align = GetVLDSTAlign(Align, dl, NumVecs, is64BitVector);
unsigned OpcodeIndex;
switch (VT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("unhandled vld type");
// Double-register operations:
case MVT::v8i8: OpcodeIndex = 0; break;
case MVT::v4f16:
case MVT::v4i16: OpcodeIndex = 1; break;
case MVT::v2f32:
case MVT::v2i32: OpcodeIndex = 2; break;
case MVT::v1i64: OpcodeIndex = 3; break;
// Quad-register operations:
case MVT::v16i8: OpcodeIndex = 0; break;
case MVT::v8f16:
case MVT::v8i16: OpcodeIndex = 1; break;
case MVT::v4f32:
case MVT::v4i32: OpcodeIndex = 2; break;
case MVT::v2f64:
case MVT::v2i64: OpcodeIndex = 3; break;
}
EVT ResTy;
if (NumVecs == 1)
ResTy = VT;
else {
unsigned ResTyElts = (NumVecs == 3) ? 4 : NumVecs;
if (!is64BitVector)
ResTyElts *= 2;
ResTy = EVT::getVectorVT(*CurDAG->getContext(), MVT::i64, ResTyElts);
}
std::vector<EVT> ResTys;
ResTys.push_back(ResTy);
if (isUpdating)
ResTys.push_back(MVT::i32);
ResTys.push_back(MVT::Other);
SDValue Pred = getAL(CurDAG, dl);
SDValue Reg0 = CurDAG->getRegister(0, MVT::i32);
SDNode *VLd;
SmallVector<SDValue, 7> Ops;
// Double registers and VLD1/VLD2 quad registers are directly supported.
if (is64BitVector || NumVecs <= 2) {
unsigned Opc = (is64BitVector ? DOpcodes[OpcodeIndex] :
QOpcodes0[OpcodeIndex]);
Ops.push_back(MemAddr);
Ops.push_back(Align);
if (isUpdating) {
SDValue Inc = N->getOperand(AddrOpIdx + 1);
bool IsImmUpdate = isPerfectIncrement(Inc, VT, NumVecs);
if (!IsImmUpdate) {
// We use a VLD1 for v1i64 even if the pseudo says vld2/3/4, so
// check for the opcode rather than the number of vector elements.
if (isVLDfixed(Opc))
Opc = getVLDSTRegisterUpdateOpcode(Opc);
Ops.push_back(Inc);
// VLD1/VLD2 fixed increment does not need Reg0 so only include it in
// the operands if not such an opcode.
} else if (!isVLDfixed(Opc))
Ops.push_back(Reg0);
}
Ops.push_back(Pred);
Ops.push_back(Reg0);
Ops.push_back(Chain);
VLd = CurDAG->getMachineNode(Opc, dl, ResTys, Ops);
} else {
// Otherwise, quad registers are loaded with two separate instructions,
// where one loads the even registers and the other loads the odd registers.
EVT AddrTy = MemAddr.getValueType();
// Load the even subregs. This is always an updating load, so that it
// provides the address to the second load for the odd subregs.
SDValue ImplDef =
SDValue(CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF, dl, ResTy), 0);
const SDValue OpsA[] = { MemAddr, Align, Reg0, ImplDef, Pred, Reg0, Chain };
SDNode *VLdA = CurDAG->getMachineNode(QOpcodes0[OpcodeIndex], dl,
ResTy, AddrTy, MVT::Other, OpsA);
Chain = SDValue(VLdA, 2);
// Load the odd subregs.
Ops.push_back(SDValue(VLdA, 1));
Ops.push_back(Align);
if (isUpdating) {
SDValue Inc = N->getOperand(AddrOpIdx + 1);
assert(isa<ConstantSDNode>(Inc.getNode()) &&
"only constant post-increment update allowed for VLD3/4");
(void)Inc;
Ops.push_back(Reg0);
}
Ops.push_back(SDValue(VLdA, 0));
Ops.push_back(Pred);
Ops.push_back(Reg0);
Ops.push_back(Chain);
VLd = CurDAG->getMachineNode(QOpcodes1[OpcodeIndex], dl, ResTys, Ops);
}
// Transfer memoperands.
MachineMemOperand *MemOp = cast<MemIntrinsicSDNode>(N)->getMemOperand();
CurDAG->setNodeMemRefs(cast<MachineSDNode>(VLd), {MemOp});
if (NumVecs == 1) {
ReplaceNode(N, VLd);
return;
}
// Extract out the subregisters.
SDValue SuperReg = SDValue(VLd, 0);
static_assert(ARM::dsub_7 == ARM::dsub_0 + 7 &&
ARM::qsub_3 == ARM::qsub_0 + 3,
"Unexpected subreg numbering");
unsigned Sub0 = (is64BitVector ? ARM::dsub_0 : ARM::qsub_0);
for (unsigned Vec = 0; Vec < NumVecs; ++Vec)
ReplaceUses(SDValue(N, Vec),
CurDAG->getTargetExtractSubreg(Sub0 + Vec, dl, VT, SuperReg));
ReplaceUses(SDValue(N, NumVecs), SDValue(VLd, 1));
if (isUpdating)
ReplaceUses(SDValue(N, NumVecs + 1), SDValue(VLd, 2));
CurDAG->RemoveDeadNode(N);
}
void ARMDAGToDAGISel::SelectVST(SDNode *N, bool isUpdating, unsigned NumVecs,
const uint16_t *DOpcodes,
const uint16_t *QOpcodes0,
const uint16_t *QOpcodes1) {
assert(NumVecs >= 1 && NumVecs <= 4 && "VST NumVecs out-of-range");
SDLoc dl(N);
SDValue MemAddr, Align;
bool IsIntrinsic = !isUpdating; // By coincidence, all supported updating
// nodes are not intrinsics.
unsigned AddrOpIdx = IsIntrinsic ? 2 : 1;
unsigned Vec0Idx = 3; // AddrOpIdx + (isUpdating ? 2 : 1)
if (!SelectAddrMode6(N, N->getOperand(AddrOpIdx), MemAddr, Align))
return;
MachineMemOperand *MemOp = cast<MemIntrinsicSDNode>(N)->getMemOperand();
SDValue Chain = N->getOperand(0);
EVT VT = N->getOperand(Vec0Idx).getValueType();
bool is64BitVector = VT.is64BitVector();
Align = GetVLDSTAlign(Align, dl, NumVecs, is64BitVector);
unsigned OpcodeIndex;
switch (VT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("unhandled vst type");
// Double-register operations:
case MVT::v8i8: OpcodeIndex = 0; break;
case MVT::v4f16:
case MVT::v4i16: OpcodeIndex = 1; break;
case MVT::v2f32:
case MVT::v2i32: OpcodeIndex = 2; break;
case MVT::v1i64: OpcodeIndex = 3; break;
// Quad-register operations:
case MVT::v16i8: OpcodeIndex = 0; break;
case MVT::v8f16:
case MVT::v8i16: OpcodeIndex = 1; break;
case MVT::v4f32:
case MVT::v4i32: OpcodeIndex = 2; break;
case MVT::v2f64:
case MVT::v2i64: OpcodeIndex = 3; break;
}
std::vector<EVT> ResTys;
if (isUpdating)
ResTys.push_back(MVT::i32);
ResTys.push_back(MVT::Other);
SDValue Pred = getAL(CurDAG, dl);
SDValue Reg0 = CurDAG->getRegister(0, MVT::i32);
SmallVector<SDValue, 7> Ops;
// Double registers and VST1/VST2 quad registers are directly supported.
if (is64BitVector || NumVecs <= 2) {
SDValue SrcReg;
if (NumVecs == 1) {
SrcReg = N->getOperand(Vec0Idx);
} else if (is64BitVector) {
// Form a REG_SEQUENCE to force register allocation.
SDValue V0 = N->getOperand(Vec0Idx + 0);
SDValue V1 = N->getOperand(Vec0Idx + 1);
if (NumVecs == 2)
SrcReg = SDValue(createDRegPairNode(MVT::v2i64, V0, V1), 0);
else {
SDValue V2 = N->getOperand(Vec0Idx + 2);
// If it's a vst3, form a quad D-register and leave the last part as
// an undef.
SDValue V3 = (NumVecs == 3)