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llvm-mirror/lib/Target/ARM/ARMISelDAGToDAG.cpp
Evan Cheng c6db78ab84 Use PC relative ldr to load from a constantpool in Thumb mode. 
llvm-svn: 33484
2007-01-24 08:53:17 +00:00

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//===-- ARMISelDAGToDAG.cpp - A dag to dag inst selector for ARM ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an instruction selector for the ARM target.
//
//===----------------------------------------------------------------------===//
#include "ARM.h"
#include "ARMISelLowering.h"
#include "ARMTargetMachine.h"
#include "ARMAddressingModes.h"
#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/Intrinsics.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Support/Debug.h"
#include <iostream>
using namespace llvm;
//===--------------------------------------------------------------------===//
/// ARMDAGToDAGISel - ARM specific code to select ARM machine
/// instructions for SelectionDAG operations.
///
namespace {
class ARMDAGToDAGISel : public SelectionDAGISel {
ARMTargetLowering Lowering;
/// 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:
ARMDAGToDAGISel(ARMTargetMachine &TM)
: SelectionDAGISel(Lowering), Lowering(TM),
Subtarget(&TM.getSubtarget<ARMSubtarget>()) {
}
virtual const char *getPassName() const {
return "ARM Instruction Selection";
}
SDNode *Select(SDOperand Op);
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
bool SelectAddrMode2(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Offset, SDOperand &Opc);
bool SelectAddrMode2Offset(SDOperand Op, SDOperand N,
SDOperand &Offset, SDOperand &Opc);
bool SelectAddrMode3(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Offset, SDOperand &Opc);
bool SelectAddrMode3Offset(SDOperand Op, SDOperand N,
SDOperand &Offset, SDOperand &Opc);
bool SelectAddrMode5(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Offset);
bool SelectAddrModePC(SDOperand Op, SDOperand N, SDOperand &Offset,
SDOperand &Label);
bool SelectThumbAddrModeRR(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Offset);
bool SelectThumbAddrModeRI5(SDOperand Op, SDOperand N, unsigned Scale,
SDOperand &Base, SDOperand &Offset,
SDOperand &OffImm);
bool SelectThumbAddrModeS1(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Offset, SDOperand &OffImm);
bool SelectThumbAddrModeS2(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Offset, SDOperand &OffImm);
bool SelectThumbAddrModeS4(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Offset, SDOperand &OffImm);
bool SelectThumbAddrModeSP(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &OffImm);
bool SelectShifterOperandReg(SDOperand Op, SDOperand N, SDOperand &A,
SDOperand &B, SDOperand &C);
// Include the pieces autogenerated from the target description.
#include "ARMGenDAGISel.inc"
};
}
void ARMDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
DEBUG(BB->dump());
DAG.setRoot(SelectRoot(DAG.getRoot()));
DAG.RemoveDeadNodes();
ScheduleAndEmitDAG(DAG);
}
bool ARMDAGToDAGISel::SelectAddrMode2(SDOperand Op, SDOperand N,
SDOperand &Base, SDOperand &Offset,
SDOperand &Opc) {
if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB) {
Base = N;
if (N.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
} else if (N.getOpcode() == ARMISD::Wrapper) {
Base = N.getOperand(0);
}
Offset = CurDAG->getRegister(0, MVT::i32);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(ARM_AM::add, 0,
ARM_AM::no_shift),
MVT::i32);
return true;
}
// Match simple R +/- imm12 operands.
if (N.getOpcode() == ISD::ADD)
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getValue();
if ((RHSC >= 0 && RHSC < 0x1000) ||
(RHSC < 0 && 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());
}
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::getAM2Opc(AddSub, RHSC,
ARM_AM::no_shift),
MVT::i32);
return true;
}
}
// Otherwise this is R +/- [possibly shifted] R
ARM_AM::AddrOpc AddSub = N.getOpcode() == ISD::ADD ? ARM_AM::add:ARM_AM::sub;
ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOperand(1));
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->getValue();
Offset = N.getOperand(1).getOperand(0);
} else {
ShOpcVal = ARM_AM::no_shift;
}
}
// Try matching (R shl C) + (R).
if (N.getOpcode() == ISD::ADD && ShOpcVal == ARM_AM::no_shift) {
ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOperand(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(0).getOperand(1))) {
ShAmt = Sh->getValue();
Offset = N.getOperand(0).getOperand(0);
Base = N.getOperand(1);
} else {
ShOpcVal = ARM_AM::no_shift;
}
}
}
Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal),
MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode2Offset(SDOperand Op, SDOperand N,
SDOperand &Offset, SDOperand &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;
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N)) {
int Val = (int)C->getValue();
if (Val >= 0 && Val < 0x1000) { // 12 bits.
Offset = CurDAG->getRegister(0, MVT::i32);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, Val,
ARM_AM::no_shift),
MVT::i32);
return true;
}
}
Offset = N;
ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N);
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->getValue();
Offset = N.getOperand(0);
} else {
ShOpcVal = ARM_AM::no_shift;
}
}
Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal),
MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode3(SDOperand Op, SDOperand N,
SDOperand &Base, SDOperand &Offset,
SDOperand &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),MVT::i32);
return true;
}
if (N.getOpcode() != ISD::ADD) {
Base = N;
if (N.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
}
Offset = CurDAG->getRegister(0, MVT::i32);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0),MVT::i32);
return true;
}
// If the RHS is +/- imm8, fold into addr mode.
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getValue();
if ((RHSC >= 0 && RHSC < 256) ||
(RHSC < 0 && RHSC > -256)) { // note -256 itself isn't allowed.
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
}
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),MVT::i32);
return true;
}
}
Base = N.getOperand(0);
Offset = N.getOperand(1);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode3Offset(SDOperand Op, SDOperand N,
SDOperand &Offset, SDOperand &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;
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N)) {
int Val = (int)C->getValue();
if (Val >= 0 && Val < 256) {
Offset = CurDAG->getRegister(0, MVT::i32);
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, Val), MVT::i32);
return true;
}
}
Offset = N;
Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, 0), MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrMode5(SDOperand Op, SDOperand N,
SDOperand &Base, SDOperand &Offset) {
if (N.getOpcode() != ISD::ADD) {
Base = N;
if (N.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
} else if (N.getOpcode() == ARMISD::Wrapper) {
Base = N.getOperand(0);
}
Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0),
MVT::i32);
return true;
}
// If the RHS is +/- imm8, fold into addr mode.
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getValue();
if ((RHSC & 3) == 0) { // The constant is implicitly multiplied by 4.
RHSC >>= 2;
if ((RHSC >= 0 && RHSC < 256) ||
(RHSC < 0 && RHSC > -256)) { // note -256 itself isn't allowed.
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
}
ARM_AM::AddrOpc AddSub = ARM_AM::add;
if (RHSC < 0) {
AddSub = ARM_AM::sub;
RHSC = - RHSC;
}
Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(AddSub, RHSC),
MVT::i32);
return true;
}
}
}
Base = N;
Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0),
MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectAddrModePC(SDOperand Op, SDOperand N,
SDOperand &Offset, SDOperand &Label) {
if (N.getOpcode() == ARMISD::PIC_ADD && N.hasOneUse()) {
Offset = N.getOperand(0);
SDOperand N1 = N.getOperand(1);
Label = CurDAG->getTargetConstant(cast<ConstantSDNode>(N1)->getValue(),
MVT::i32);
return true;
}
return false;
}
bool ARMDAGToDAGISel::SelectThumbAddrModeRR(SDOperand Op, SDOperand N,
SDOperand &Base, SDOperand &Offset){
if (N.getOpcode() != ISD::ADD) {
Base = N;
// We must materialize a zero in a reg! Returning an constant here won't
// work since its node is -1 so it won't get added to the selection queue.
// Explicitly issue a tMOVri8 node!
Offset = SDOperand(CurDAG->getTargetNode(ARM::tMOVri8, MVT::i32,
CurDAG->getTargetConstant(0, MVT::i32)), 0);
return true;
}
Base = N.getOperand(0);
Offset = N.getOperand(1);
return true;
}
bool
ARMDAGToDAGISel::SelectThumbAddrModeRI5(SDOperand Op, SDOperand N,
unsigned Scale, SDOperand &Base,
SDOperand &Offset, SDOperand &OffImm) {
if (Scale == 4) {
SDOperand TmpBase, TmpOffImm;
if (SelectThumbAddrModeSP(Op, N, TmpBase, TmpOffImm))
return false; // We want to select tLDRspi / tSTRspi instead.
if (N.getOpcode() == ARMISD::Wrapper &&
N.getOperand(0).getOpcode() == ISD::TargetConstantPool)
return false; // We want to select tLDRpci instead.
}
if (N.getOpcode() != ISD::ADD) {
Base = (N.getOpcode() == ARMISD::Wrapper) ? N.getOperand(0) : N;
Offset = CurDAG->getRegister(0, MVT::i32);
OffImm = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
// If the RHS is + imm5 * scale, fold into addr mode.
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getValue();
if ((RHSC & (Scale-1)) == 0) { // The constant is implicitly multiplied.
RHSC /= Scale;
if (RHSC >= 0 && RHSC < 32) {
Base = N.getOperand(0);
Offset = CurDAG->getRegister(0, MVT::i32);
OffImm = CurDAG->getTargetConstant(RHSC, MVT::i32);
return true;
}
}
}
Base = N.getOperand(0);
Offset = N.getOperand(1);
OffImm = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
bool ARMDAGToDAGISel::SelectThumbAddrModeS1(SDOperand Op, SDOperand N,
SDOperand &Base, SDOperand &Offset,
SDOperand &OffImm) {
return SelectThumbAddrModeRI5(Op, N, 1, Base, Offset, OffImm);
}
bool ARMDAGToDAGISel::SelectThumbAddrModeS2(SDOperand Op, SDOperand N,
SDOperand &Base, SDOperand &Offset,
SDOperand &OffImm) {
return SelectThumbAddrModeRI5(Op, N, 2, Base, Offset, OffImm);
}
bool ARMDAGToDAGISel::SelectThumbAddrModeS4(SDOperand Op, SDOperand N,
SDOperand &Base, SDOperand &Offset,
SDOperand &OffImm) {
return SelectThumbAddrModeRI5(Op, N, 4, Base, Offset, OffImm);
}
bool ARMDAGToDAGISel::SelectThumbAddrModeSP(SDOperand Op, SDOperand N,
SDOperand &Base, SDOperand &OffImm) {
if (N.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
OffImm = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
if (N.getOpcode() == ISD::ADD &&
N.getOperand(0).getOpcode() == ISD::FrameIndex) {
// If the RHS is + imm8 * scale, fold into addr mode.
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getValue();
if ((RHSC & 3) == 0) { // The constant is implicitly multiplied.
RHSC >>= 2;
if (RHSC >= 0 && RHSC < 256) {
int FI = cast<FrameIndexSDNode>(N.getOperand(0))->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
OffImm = CurDAG->getTargetConstant(RHSC, MVT::i32);
return true;
}
}
}
}
return false;
}
bool ARMDAGToDAGISel::SelectShifterOperandReg(SDOperand Op,
SDOperand N,
SDOperand &BaseReg,
SDOperand &ShReg,
SDOperand &Opc) {
ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N);
// 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;
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
ShReg = CurDAG->getRegister(0, MVT::i32);
ShImmVal = RHS->getValue() & 31;
} else {
ShReg = N.getOperand(1);
}
Opc = CurDAG->getTargetConstant(ARM_AM::getSORegOpc(ShOpcVal, ShImmVal),
MVT::i32);
return true;
}
SDNode *ARMDAGToDAGISel::Select(SDOperand Op) {
SDNode *N = Op.Val;
unsigned Opcode = N->getOpcode();
if (Opcode >= ISD::BUILTIN_OP_END && Opcode < ARMISD::FIRST_NUMBER)
return NULL; // Already selected.
switch (N->getOpcode()) {
default: break;
case ISD::Constant: {
unsigned Val = cast<ConstantSDNode>(N)->getValue();
bool UseCP = true;
if (Subtarget->isThumb())
UseCP = (Val > 255 && // MOV
~Val > 255 && // MOV + MVN
!ARM_AM::isThumbImmShiftedVal(Val)); // MOV + LSL
else
UseCP = (ARM_AM::getSOImmVal(Val) == -1 && // MOV
ARM_AM::getSOImmVal(~Val) == -1 && // MVN
!ARM_AM::isSOImmTwoPartVal(Val)); // two instrs.
if (UseCP) {
SDOperand CPIdx =
CurDAG->getTargetConstantPool(ConstantInt::get(Type::Int32Ty, Val),
TLI.getPointerTy());
SDNode *ResNode;
if (Subtarget->isThumb())
ResNode = CurDAG->getTargetNode(ARM::tLDRpci, MVT::i32, MVT::Other,
CPIdx, CurDAG->getEntryNode());
else {
SDOperand Ops[] = {
CPIdx,
CurDAG->getRegister(0, MVT::i32),
CurDAG->getTargetConstant(0, MVT::i32),
CurDAG->getEntryNode()
};
ResNode = CurDAG->getTargetNode(ARM::LDR, MVT::i32, MVT::Other, Ops, 4);
}
ReplaceUses(Op, SDOperand(ResNode, 0));
return NULL;
}
// Other cases are autogenerated.
break;
}
case ISD::FrameIndex: {
// Selects to ADDri FI, 0 which in turn will become ADDri SP, imm.
int FI = cast<FrameIndexSDNode>(N)->getIndex();
unsigned Opc = Subtarget->isThumb() ? ARM::tADDrSPi : ARM::ADDri;
SDOperand TFI = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
return CurDAG->SelectNodeTo(N, Opc, MVT::i32, TFI,
CurDAG->getTargetConstant(0, MVT::i32));
}
case ISD::MUL:
if (Subtarget->isThumb())
break;
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
unsigned RHSV = C->getValue();
if (!RHSV) break;
if (isPowerOf2_32(RHSV-1)) { // 2^n+1?
SDOperand V = Op.getOperand(0);
AddToISelQueue(V);
unsigned ShImm = ARM_AM::getSORegOpc(ARM_AM::lsl, Log2_32(RHSV-1));
SDOperand Ops[] = { V, V, CurDAG->getRegister(0, MVT::i32),
CurDAG->getTargetConstant(ShImm, MVT::i32)
};
return CurDAG->SelectNodeTo(N, ARM::ADDrs, MVT::i32, Ops, 4);
}
if (isPowerOf2_32(RHSV+1)) { // 2^n-1?
SDOperand V = Op.getOperand(0);
AddToISelQueue(V);
unsigned ShImm = ARM_AM::getSORegOpc(ARM_AM::lsl, Log2_32(RHSV+1));
SDOperand Ops[] = { V, V, CurDAG->getRegister(0, MVT::i32),
CurDAG->getTargetConstant(ShImm, MVT::i32)
};
return CurDAG->SelectNodeTo(N, ARM::RSBrs, MVT::i32, Ops, 4);
}
}
break;
case ARMISD::FMRRD:
AddToISelQueue(Op.getOperand(0));
return CurDAG->getTargetNode(ARM::FMRRD, MVT::i32, MVT::i32,
Op.getOperand(0));
case ARMISD::MULHILOU:
AddToISelQueue(Op.getOperand(0));
AddToISelQueue(Op.getOperand(1));
return CurDAG->getTargetNode(ARM::UMULL, MVT::i32, MVT::i32,
Op.getOperand(0), Op.getOperand(1));
case ARMISD::MULHILOS:
AddToISelQueue(Op.getOperand(0));
AddToISelQueue(Op.getOperand(1));
return CurDAG->getTargetNode(ARM::SMULL, MVT::i32, MVT::i32,
Op.getOperand(0), Op.getOperand(1));
case ISD::LOAD: {
LoadSDNode *LD = cast<LoadSDNode>(Op);
ISD::MemIndexedMode AM = LD->getAddressingMode();
MVT::ValueType LoadedVT = LD->getLoadedVT();
if (AM != ISD::UNINDEXED) {
SDOperand Offset, AMOpc;
bool isPre = (AM == ISD::PRE_INC) || (AM == ISD::PRE_DEC);
unsigned Opcode = 0;
bool Match = false;
if (LoadedVT == MVT::i32 &&
SelectAddrMode2Offset(Op, LD->getOffset(), Offset, AMOpc)) {
Opcode = isPre ? ARM::LDR_PRE : ARM::LDR_POST;
Match = true;
} else if (LoadedVT == MVT::i16 &&
SelectAddrMode3Offset(Op, 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(Op, LD->getOffset(), Offset, AMOpc)) {
Match = true;
Opcode = isPre ? ARM::LDRSB_PRE : ARM::LDRSB_POST;
}
} else {
if (SelectAddrMode2Offset(Op, LD->getOffset(), Offset, AMOpc)) {
Match = true;
Opcode = isPre ? ARM::LDRB_PRE : ARM::LDRB_POST;
}
}
}
if (Match) {
SDOperand Chain = LD->getChain();
SDOperand Base = LD->getBasePtr();
AddToISelQueue(Chain);
AddToISelQueue(Base);
AddToISelQueue(Offset);
SDOperand Ops[] = { Base, Offset, AMOpc, Chain };
return CurDAG->getTargetNode(Opcode, MVT::i32, MVT::i32,
MVT::Other, Ops, 4);
}
}
// Other cases are autogenerated.
break;
}
}
return SelectCode(Op);
}
/// createARMISelDag - This pass converts a legalized DAG into a
/// ARM-specific DAG, ready for instruction scheduling.
///
FunctionPass *llvm::createARMISelDag(ARMTargetMachine &TM) {
return new ARMDAGToDAGISel(TM);
}
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