mirror of
https://github.com/c64scene-ar/llvm-6502.git
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9f6636ff0c
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35163 91177308-0d34-0410-b5e6-96231b3b80d8
695 lines
25 KiB
C++
695 lines
25 KiB
C++
//===-- ARMISelDAGToDAG.cpp - A dag to dag inst selector for ARM ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an instruction selector for the ARM target.
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//
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//===----------------------------------------------------------------------===//
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#include "ARM.h"
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#include "ARMISelLowering.h"
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#include "ARMTargetMachine.h"
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#include "ARMAddressingModes.h"
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#include "llvm/CallingConv.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/CodeGen/SSARegMap.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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//===--------------------------------------------------------------------===//
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/// ARMDAGToDAGISel - ARM specific code to select ARM machine
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/// instructions for SelectionDAG operations.
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///
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namespace {
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class ARMDAGToDAGISel : public SelectionDAGISel {
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ARMTargetLowering Lowering;
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/// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
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/// make the right decision when generating code for different targets.
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const ARMSubtarget *Subtarget;
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public:
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ARMDAGToDAGISel(ARMTargetMachine &TM)
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: SelectionDAGISel(Lowering), Lowering(TM),
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Subtarget(&TM.getSubtarget<ARMSubtarget>()) {
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}
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virtual const char *getPassName() const {
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return "ARM Instruction Selection";
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}
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SDNode *Select(SDOperand Op);
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virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
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bool SelectAddrMode2(SDOperand Op, SDOperand N, SDOperand &Base,
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SDOperand &Offset, SDOperand &Opc);
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bool SelectAddrMode2Offset(SDOperand Op, SDOperand N,
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SDOperand &Offset, SDOperand &Opc);
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bool SelectAddrMode3(SDOperand Op, SDOperand N, SDOperand &Base,
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SDOperand &Offset, SDOperand &Opc);
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bool SelectAddrMode3Offset(SDOperand Op, SDOperand N,
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SDOperand &Offset, SDOperand &Opc);
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bool SelectAddrMode5(SDOperand Op, SDOperand N, SDOperand &Base,
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SDOperand &Offset);
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bool SelectAddrModePC(SDOperand Op, SDOperand N, SDOperand &Offset,
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SDOperand &Label);
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bool SelectThumbAddrModeRR(SDOperand Op, SDOperand N, SDOperand &Base,
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SDOperand &Offset);
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bool SelectThumbAddrModeRI5(SDOperand Op, SDOperand N, unsigned Scale,
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SDOperand &Base, SDOperand &OffImm,
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SDOperand &Offset);
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bool SelectThumbAddrModeS1(SDOperand Op, SDOperand N, SDOperand &Base,
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SDOperand &OffImm, SDOperand &Offset);
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bool SelectThumbAddrModeS2(SDOperand Op, SDOperand N, SDOperand &Base,
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SDOperand &OffImm, SDOperand &Offset);
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bool SelectThumbAddrModeS4(SDOperand Op, SDOperand N, SDOperand &Base,
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SDOperand &OffImm, SDOperand &Offset);
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bool SelectThumbAddrModeSP(SDOperand Op, SDOperand N, SDOperand &Base,
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SDOperand &OffImm);
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bool SelectShifterOperandReg(SDOperand Op, SDOperand N, SDOperand &A,
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SDOperand &B, SDOperand &C);
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// Include the pieces autogenerated from the target description.
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#include "ARMGenDAGISel.inc"
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};
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}
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void ARMDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
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DEBUG(BB->dump());
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DAG.setRoot(SelectRoot(DAG.getRoot()));
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DAG.RemoveDeadNodes();
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ScheduleAndEmitDAG(DAG);
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}
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bool ARMDAGToDAGISel::SelectAddrMode2(SDOperand Op, SDOperand N,
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SDOperand &Base, SDOperand &Offset,
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SDOperand &Opc) {
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if (N.getOpcode() == ISD::MUL) {
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if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
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// X * [3,5,9] -> X + X * [2,4,8] etc.
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int RHSC = (int)RHS->getValue();
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if (RHSC & 1) {
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RHSC = RHSC & ~1;
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ARM_AM::AddrOpc AddSub = ARM_AM::add;
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if (RHSC < 0) {
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AddSub = ARM_AM::sub;
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RHSC = - RHSC;
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}
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if (isPowerOf2_32(RHSC)) {
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unsigned ShAmt = Log2_32(RHSC);
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Base = Offset = N.getOperand(0);
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt,
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ARM_AM::lsl),
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MVT::i32);
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return true;
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}
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}
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}
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}
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if (N.getOpcode() != ISD::ADD && N.getOpcode() != ISD::SUB) {
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Base = N;
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if (N.getOpcode() == ISD::FrameIndex) {
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int FI = cast<FrameIndexSDNode>(N)->getIndex();
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Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
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} else if (N.getOpcode() == ARMISD::Wrapper) {
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Base = N.getOperand(0);
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}
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Offset = CurDAG->getRegister(0, MVT::i32);
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(ARM_AM::add, 0,
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ARM_AM::no_shift),
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MVT::i32);
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return true;
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}
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// Match simple R +/- imm12 operands.
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if (N.getOpcode() == ISD::ADD)
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if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
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int RHSC = (int)RHS->getValue();
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if ((RHSC >= 0 && RHSC < 0x1000) ||
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(RHSC < 0 && RHSC > -0x1000)) { // 12 bits.
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Base = N.getOperand(0);
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if (Base.getOpcode() == ISD::FrameIndex) {
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int FI = cast<FrameIndexSDNode>(Base)->getIndex();
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Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
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}
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Offset = CurDAG->getRegister(0, MVT::i32);
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ARM_AM::AddrOpc AddSub = ARM_AM::add;
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if (RHSC < 0) {
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AddSub = ARM_AM::sub;
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RHSC = - RHSC;
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}
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, RHSC,
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ARM_AM::no_shift),
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MVT::i32);
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return true;
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}
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}
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// Otherwise this is R +/- [possibly shifted] R
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ARM_AM::AddrOpc AddSub = N.getOpcode() == ISD::ADD ? ARM_AM::add:ARM_AM::sub;
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ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOperand(1));
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unsigned ShAmt = 0;
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Base = N.getOperand(0);
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Offset = N.getOperand(1);
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if (ShOpcVal != ARM_AM::no_shift) {
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// Check to see if the RHS of the shift is a constant, if not, we can't fold
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// it.
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if (ConstantSDNode *Sh =
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dyn_cast<ConstantSDNode>(N.getOperand(1).getOperand(1))) {
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ShAmt = Sh->getValue();
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Offset = N.getOperand(1).getOperand(0);
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} else {
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ShOpcVal = ARM_AM::no_shift;
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}
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}
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// Try matching (R shl C) + (R).
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if (N.getOpcode() == ISD::ADD && ShOpcVal == ARM_AM::no_shift) {
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ShOpcVal = ARM_AM::getShiftOpcForNode(N.getOperand(0));
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if (ShOpcVal != ARM_AM::no_shift) {
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// Check to see if the RHS of the shift is a constant, if not, we can't
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// fold it.
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if (ConstantSDNode *Sh =
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dyn_cast<ConstantSDNode>(N.getOperand(0).getOperand(1))) {
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ShAmt = Sh->getValue();
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Offset = N.getOperand(0).getOperand(0);
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Base = N.getOperand(1);
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} else {
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ShOpcVal = ARM_AM::no_shift;
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}
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}
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}
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal),
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MVT::i32);
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return true;
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}
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bool ARMDAGToDAGISel::SelectAddrMode2Offset(SDOperand Op, SDOperand N,
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SDOperand &Offset, SDOperand &Opc) {
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unsigned Opcode = Op.getOpcode();
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ISD::MemIndexedMode AM = (Opcode == ISD::LOAD)
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? cast<LoadSDNode>(Op)->getAddressingMode()
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: cast<StoreSDNode>(Op)->getAddressingMode();
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ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC)
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? ARM_AM::add : ARM_AM::sub;
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if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N)) {
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int Val = (int)C->getValue();
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if (Val >= 0 && Val < 0x1000) { // 12 bits.
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Offset = CurDAG->getRegister(0, MVT::i32);
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, Val,
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ARM_AM::no_shift),
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MVT::i32);
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return true;
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}
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}
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Offset = N;
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ARM_AM::ShiftOpc ShOpcVal = ARM_AM::getShiftOpcForNode(N);
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unsigned ShAmt = 0;
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if (ShOpcVal != ARM_AM::no_shift) {
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// Check to see if the RHS of the shift is a constant, if not, we can't fold
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// it.
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if (ConstantSDNode *Sh = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
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ShAmt = Sh->getValue();
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Offset = N.getOperand(0);
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} else {
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ShOpcVal = ARM_AM::no_shift;
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}
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}
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM2Opc(AddSub, ShAmt, ShOpcVal),
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MVT::i32);
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return true;
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}
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bool ARMDAGToDAGISel::SelectAddrMode3(SDOperand Op, SDOperand N,
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SDOperand &Base, SDOperand &Offset,
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SDOperand &Opc) {
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if (N.getOpcode() == ISD::SUB) {
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// X - C is canonicalize to X + -C, no need to handle it here.
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Base = N.getOperand(0);
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Offset = N.getOperand(1);
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::sub, 0),MVT::i32);
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return true;
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}
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if (N.getOpcode() != ISD::ADD) {
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Base = N;
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if (N.getOpcode() == ISD::FrameIndex) {
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int FI = cast<FrameIndexSDNode>(N)->getIndex();
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Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
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}
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Offset = CurDAG->getRegister(0, MVT::i32);
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0),MVT::i32);
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return true;
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}
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// If the RHS is +/- imm8, fold into addr mode.
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if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
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int RHSC = (int)RHS->getValue();
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if ((RHSC >= 0 && RHSC < 256) ||
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(RHSC < 0 && RHSC > -256)) { // note -256 itself isn't allowed.
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Base = N.getOperand(0);
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if (Base.getOpcode() == ISD::FrameIndex) {
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int FI = cast<FrameIndexSDNode>(Base)->getIndex();
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Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
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}
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Offset = CurDAG->getRegister(0, MVT::i32);
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ARM_AM::AddrOpc AddSub = ARM_AM::add;
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if (RHSC < 0) {
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AddSub = ARM_AM::sub;
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RHSC = - RHSC;
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}
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, RHSC),MVT::i32);
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return true;
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}
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}
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Base = N.getOperand(0);
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Offset = N.getOperand(1);
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(ARM_AM::add, 0), MVT::i32);
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return true;
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}
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bool ARMDAGToDAGISel::SelectAddrMode3Offset(SDOperand Op, SDOperand N,
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SDOperand &Offset, SDOperand &Opc) {
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unsigned Opcode = Op.getOpcode();
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ISD::MemIndexedMode AM = (Opcode == ISD::LOAD)
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? cast<LoadSDNode>(Op)->getAddressingMode()
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: cast<StoreSDNode>(Op)->getAddressingMode();
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ARM_AM::AddrOpc AddSub = (AM == ISD::PRE_INC || AM == ISD::POST_INC)
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? ARM_AM::add : ARM_AM::sub;
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if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N)) {
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int Val = (int)C->getValue();
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if (Val >= 0 && Val < 256) {
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Offset = CurDAG->getRegister(0, MVT::i32);
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, Val), MVT::i32);
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return true;
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}
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}
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Offset = N;
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Opc = CurDAG->getTargetConstant(ARM_AM::getAM3Opc(AddSub, 0), MVT::i32);
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return true;
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}
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bool ARMDAGToDAGISel::SelectAddrMode5(SDOperand Op, SDOperand N,
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SDOperand &Base, SDOperand &Offset) {
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if (N.getOpcode() != ISD::ADD) {
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Base = N;
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if (N.getOpcode() == ISD::FrameIndex) {
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int FI = cast<FrameIndexSDNode>(N)->getIndex();
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Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
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} else if (N.getOpcode() == ARMISD::Wrapper) {
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Base = N.getOperand(0);
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}
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Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0),
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MVT::i32);
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return true;
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}
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// If the RHS is +/- imm8, fold into addr mode.
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if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
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int RHSC = (int)RHS->getValue();
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if ((RHSC & 3) == 0) { // The constant is implicitly multiplied by 4.
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RHSC >>= 2;
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if ((RHSC >= 0 && RHSC < 256) ||
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(RHSC < 0 && RHSC > -256)) { // note -256 itself isn't allowed.
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Base = N.getOperand(0);
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if (Base.getOpcode() == ISD::FrameIndex) {
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int FI = cast<FrameIndexSDNode>(Base)->getIndex();
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Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
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}
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ARM_AM::AddrOpc AddSub = ARM_AM::add;
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if (RHSC < 0) {
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AddSub = ARM_AM::sub;
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RHSC = - RHSC;
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}
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Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(AddSub, RHSC),
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MVT::i32);
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return true;
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}
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}
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}
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Base = N;
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Offset = CurDAG->getTargetConstant(ARM_AM::getAM5Opc(ARM_AM::add, 0),
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MVT::i32);
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return true;
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}
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bool ARMDAGToDAGISel::SelectAddrModePC(SDOperand Op, SDOperand N,
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SDOperand &Offset, SDOperand &Label) {
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if (N.getOpcode() == ARMISD::PIC_ADD && N.hasOneUse()) {
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Offset = N.getOperand(0);
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SDOperand N1 = N.getOperand(1);
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Label = CurDAG->getTargetConstant(cast<ConstantSDNode>(N1)->getValue(),
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MVT::i32);
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return true;
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}
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return false;
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}
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bool ARMDAGToDAGISel::SelectThumbAddrModeRR(SDOperand Op, SDOperand N,
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SDOperand &Base, SDOperand &Offset){
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if (N.getOpcode() != ISD::ADD) {
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Base = N;
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// We must materialize a zero in a reg! Returning an constant here won't
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// work since its node is -1 so it won't get added to the selection queue.
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// Explicitly issue a tMOVri8 node!
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Offset = SDOperand(CurDAG->getTargetNode(ARM::tMOVi8, MVT::i32,
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CurDAG->getTargetConstant(0, MVT::i32)), 0);
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return true;
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}
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Base = N.getOperand(0);
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Offset = N.getOperand(1);
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return true;
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}
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bool
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ARMDAGToDAGISel::SelectThumbAddrModeRI5(SDOperand Op, SDOperand N,
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unsigned Scale, SDOperand &Base,
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SDOperand &OffImm, SDOperand &Offset) {
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if (Scale == 4) {
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SDOperand TmpBase, TmpOffImm;
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if (SelectThumbAddrModeSP(Op, N, TmpBase, TmpOffImm))
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return false; // We want to select tLDRspi / tSTRspi instead.
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if (N.getOpcode() == ARMISD::Wrapper &&
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N.getOperand(0).getOpcode() == ISD::TargetConstantPool)
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return false; // We want to select tLDRpci instead.
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}
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if (N.getOpcode() != ISD::ADD) {
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Base = (N.getOpcode() == ARMISD::Wrapper) ? N.getOperand(0) : N;
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Offset = CurDAG->getRegister(0, MVT::i32);
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OffImm = CurDAG->getTargetConstant(0, MVT::i32);
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return true;
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}
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// Thumb does not have [sp, r] address mode.
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RegisterSDNode *LHSR = dyn_cast<RegisterSDNode>(N.getOperand(0));
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RegisterSDNode *RHSR = dyn_cast<RegisterSDNode>(N.getOperand(1));
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if ((LHSR && LHSR->getReg() == ARM::SP) ||
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(RHSR && RHSR->getReg() == ARM::SP)) {
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Base = N;
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Offset = CurDAG->getRegister(0, MVT::i32);
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OffImm = CurDAG->getTargetConstant(0, MVT::i32);
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return true;
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}
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// If the RHS is + imm5 * scale, fold into addr mode.
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if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
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int RHSC = (int)RHS->getValue();
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if ((RHSC & (Scale-1)) == 0) { // The constant is implicitly multiplied.
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RHSC /= Scale;
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if (RHSC >= 0 && RHSC < 32) {
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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 &OffImm,
|
|
SDOperand &Offset) {
|
|
return SelectThumbAddrModeRI5(Op, N, 1, Base, OffImm, Offset);
|
|
}
|
|
|
|
bool ARMDAGToDAGISel::SelectThumbAddrModeS2(SDOperand Op, SDOperand N,
|
|
SDOperand &Base, SDOperand &OffImm,
|
|
SDOperand &Offset) {
|
|
return SelectThumbAddrModeRI5(Op, N, 2, Base, OffImm, Offset);
|
|
}
|
|
|
|
bool ARMDAGToDAGISel::SelectThumbAddrModeS4(SDOperand Op, SDOperand N,
|
|
SDOperand &Base, SDOperand &OffImm,
|
|
SDOperand &Offset) {
|
|
return SelectThumbAddrModeRI5(Op, N, 4, Base, OffImm, Offset);
|
|
}
|
|
|
|
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)
|
|
return false;
|
|
|
|
RegisterSDNode *LHSR = dyn_cast<RegisterSDNode>(N.getOperand(0));
|
|
if (N.getOperand(0).getOpcode() == ISD::FrameIndex ||
|
|
(LHSR && LHSR->getReg() == ARM::SP)) {
|
|
// 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) {
|
|
Base = N.getOperand(0);
|
|
if (Base.getOpcode() == ISD::FrameIndex) {
|
|
int FI = cast<FrameIndexSDNode>(Base)->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::tLDRcp, 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::LDRcp, 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::ADD: {
|
|
// Select add sp, c to tADDhirr.
|
|
SDOperand N0 = Op.getOperand(0);
|
|
SDOperand N1 = Op.getOperand(1);
|
|
RegisterSDNode *LHSR = dyn_cast<RegisterSDNode>(Op.getOperand(0));
|
|
RegisterSDNode *RHSR = dyn_cast<RegisterSDNode>(Op.getOperand(1));
|
|
if (LHSR && LHSR->getReg() == ARM::SP) {
|
|
std::swap(N0, N1);
|
|
std::swap(LHSR, RHSR);
|
|
}
|
|
if (RHSR && RHSR->getReg() == ARM::SP) {
|
|
AddToISelQueue(N0);
|
|
AddToISelQueue(N1);
|
|
return CurDAG->SelectNodeTo(N, ARM::tADDhirr, Op.getValueType(), N0, N1);
|
|
}
|
|
break;
|
|
}
|
|
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);
|
|
}
|