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llvm-6502/lib/Target/ARM/ARMFastISel.cpp
Jakob Stoklund Olesen c54f634886 Switch ARM target to register masks. 
I'll let the buildbots determine the compile time improvements from this
change, but 464.h264ref has 5% faster codegen at -O2.

This patch does cause some assembly changes.  Branch folding can make
different decisions about calls with dead return values.
CriticalAntiDepBreaker may choose different registers because its
liveness tracking is affected.  MachineCopyPropagation may sometimes
leave a dead copy behind.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151331 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-24 01:19:29 +00:00

2609 lines
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//===-- ARMFastISel.cpp - ARM FastISel implementation ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the ARM-specific support for the FastISel class. Some
// of the target-specific code is generated by tablegen in the file
// ARMGenFastISel.inc, which is #included here.
//
//===----------------------------------------------------------------------===//
#include "ARM.h"
#include "ARMBaseInstrInfo.h"
#include "ARMCallingConv.h"
#include "ARMRegisterInfo.h"
#include "ARMTargetMachine.h"
#include "ARMSubtarget.h"
#include "ARMConstantPoolValue.h"
#include "MCTargetDesc/ARMAddressingModes.h"
#include "llvm/CallingConv.h"
#include "llvm/DerivedTypes.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Module.h"
#include "llvm/Operator.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
static cl::opt<bool>
DisableARMFastISel("disable-arm-fast-isel",
cl::desc("Turn off experimental ARM fast-isel support"),
cl::init(false), cl::Hidden);
extern cl::opt<bool> EnableARMLongCalls;
namespace {
// All possible address modes, plus some.
typedef struct Address {
enum {
RegBase,
FrameIndexBase
} BaseType;
union {
unsigned Reg;
int FI;
} Base;
int Offset;
// Innocuous defaults for our address.
Address()
: BaseType(RegBase), Offset(0) {
Base.Reg = 0;
}
} Address;
class ARMFastISel : public FastISel {
/// 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;
const TargetMachine &TM;
const TargetInstrInfo &TII;
const TargetLowering &TLI;
ARMFunctionInfo *AFI;
// Convenience variables to avoid some queries.
bool isThumb2;
LLVMContext *Context;
public:
explicit ARMFastISel(FunctionLoweringInfo &funcInfo)
: FastISel(funcInfo),
TM(funcInfo.MF->getTarget()),
TII(*TM.getInstrInfo()),
TLI(*TM.getTargetLowering()) {
Subtarget = &TM.getSubtarget<ARMSubtarget>();
AFI = funcInfo.MF->getInfo<ARMFunctionInfo>();
isThumb2 = AFI->isThumbFunction();
Context = &funcInfo.Fn->getContext();
}
// Code from FastISel.cpp.
virtual unsigned FastEmitInst_(unsigned MachineInstOpcode,
const TargetRegisterClass *RC);
virtual unsigned FastEmitInst_r(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill);
virtual unsigned FastEmitInst_rr(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill);
virtual unsigned FastEmitInst_rrr(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill,
unsigned Op2, bool Op2IsKill);
virtual unsigned FastEmitInst_ri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
uint64_t Imm);
virtual unsigned FastEmitInst_rf(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
const ConstantFP *FPImm);
virtual unsigned FastEmitInst_rri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill,
uint64_t Imm);
virtual unsigned FastEmitInst_i(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
uint64_t Imm);
virtual unsigned FastEmitInst_ii(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
uint64_t Imm1, uint64_t Imm2);
virtual unsigned FastEmitInst_extractsubreg(MVT RetVT,
unsigned Op0, bool Op0IsKill,
uint32_t Idx);
// Backend specific FastISel code.
virtual bool TargetSelectInstruction(const Instruction *I);
virtual unsigned TargetMaterializeConstant(const Constant *C);
virtual unsigned TargetMaterializeAlloca(const AllocaInst *AI);
virtual bool TryToFoldLoad(MachineInstr *MI, unsigned OpNo,
const LoadInst *LI);
#include "ARMGenFastISel.inc"
// Instruction selection routines.
private:
bool SelectLoad(const Instruction *I);
bool SelectStore(const Instruction *I);
bool SelectBranch(const Instruction *I);
bool SelectIndirectBr(const Instruction *I);
bool SelectCmp(const Instruction *I);
bool SelectFPExt(const Instruction *I);
bool SelectFPTrunc(const Instruction *I);
bool SelectBinaryIntOp(const Instruction *I, unsigned ISDOpcode);
bool SelectBinaryFPOp(const Instruction *I, unsigned ISDOpcode);
bool SelectIToFP(const Instruction *I, bool isSigned);
bool SelectFPToI(const Instruction *I, bool isSigned);
bool SelectDiv(const Instruction *I, bool isSigned);
bool SelectRem(const Instruction *I, bool isSigned);
bool SelectCall(const Instruction *I, const char *IntrMemName);
bool SelectIntrinsicCall(const IntrinsicInst &I);
bool SelectSelect(const Instruction *I);
bool SelectRet(const Instruction *I);
bool SelectTrunc(const Instruction *I);
bool SelectIntExt(const Instruction *I);
// Utility routines.
private:
bool isTypeLegal(Type *Ty, MVT &VT);
bool isLoadTypeLegal(Type *Ty, MVT &VT);
bool ARMEmitCmp(const Value *Src1Value, const Value *Src2Value,
bool isZExt);
bool ARMEmitLoad(EVT VT, unsigned &ResultReg, Address &Addr,
unsigned Alignment = 0, bool isZExt = true,
bool allocReg = true);
bool ARMEmitStore(EVT VT, unsigned SrcReg, Address &Addr,
unsigned Alignment = 0);
bool ARMComputeAddress(const Value *Obj, Address &Addr);
void ARMSimplifyAddress(Address &Addr, EVT VT, bool useAM3);
bool ARMIsMemCpySmall(uint64_t Len);
bool ARMTryEmitSmallMemCpy(Address Dest, Address Src, uint64_t Len);
unsigned ARMEmitIntExt(EVT SrcVT, unsigned SrcReg, EVT DestVT, bool isZExt);
unsigned ARMMaterializeFP(const ConstantFP *CFP, EVT VT);
unsigned ARMMaterializeInt(const Constant *C, EVT VT);
unsigned ARMMaterializeGV(const GlobalValue *GV, EVT VT);
unsigned ARMMoveToFPReg(EVT VT, unsigned SrcReg);
unsigned ARMMoveToIntReg(EVT VT, unsigned SrcReg);
unsigned ARMSelectCallOp(const GlobalValue *GV);
// Call handling routines.
private:
CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool Return);
bool ProcessCallArgs(SmallVectorImpl<Value*> &Args,
SmallVectorImpl<unsigned> &ArgRegs,
SmallVectorImpl<MVT> &ArgVTs,
SmallVectorImpl<ISD::ArgFlagsTy> &ArgFlags,
SmallVectorImpl<unsigned> &RegArgs,
CallingConv::ID CC,
unsigned &NumBytes);
bool FinishCall(MVT RetVT, SmallVectorImpl<unsigned> &UsedRegs,
const Instruction *I, CallingConv::ID CC,
unsigned &NumBytes);
bool ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call);
// OptionalDef handling routines.
private:
bool isARMNEONPred(const MachineInstr *MI);
bool DefinesOptionalPredicate(MachineInstr *MI, bool *CPSR);
const MachineInstrBuilder &AddOptionalDefs(const MachineInstrBuilder &MIB);
void AddLoadStoreOperands(EVT VT, Address &Addr,
const MachineInstrBuilder &MIB,
unsigned Flags, bool useAM3);
};
} // end anonymous namespace
#include "ARMGenCallingConv.inc"
// DefinesOptionalPredicate - This is different from DefinesPredicate in that
// we don't care about implicit defs here, just places we'll need to add a
// default CCReg argument. Sets CPSR if we're setting CPSR instead of CCR.
bool ARMFastISel::DefinesOptionalPredicate(MachineInstr *MI, bool *CPSR) {
if (!MI->hasOptionalDef())
return false;
// Look to see if our OptionalDef is defining CPSR or CCR.
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
if (!MO.isReg() || !MO.isDef()) continue;
if (MO.getReg() == ARM::CPSR)
*CPSR = true;
}
return true;
}
bool ARMFastISel::isARMNEONPred(const MachineInstr *MI) {
const MCInstrDesc &MCID = MI->getDesc();
// If we're a thumb2 or not NEON function we were handled via isPredicable.
if ((MCID.TSFlags & ARMII::DomainMask) != ARMII::DomainNEON ||
AFI->isThumb2Function())
return false;
for (unsigned i = 0, e = MCID.getNumOperands(); i != e; ++i)
if (MCID.OpInfo[i].isPredicate())
return true;
return false;
}
// If the machine is predicable go ahead and add the predicate operands, if
// it needs default CC operands add those.
// TODO: If we want to support thumb1 then we'll need to deal with optional
// CPSR defs that need to be added before the remaining operands. See s_cc_out
// for descriptions why.
const MachineInstrBuilder &
ARMFastISel::AddOptionalDefs(const MachineInstrBuilder &MIB) {
MachineInstr *MI = &*MIB;
// Do we use a predicate? or...
// Are we NEON in ARM mode and have a predicate operand? If so, I know
// we're not predicable but add it anyways.
if (TII.isPredicable(MI) || isARMNEONPred(MI))
AddDefaultPred(MIB);
// Do we optionally set a predicate? Preds is size > 0 iff the predicate
// defines CPSR. All other OptionalDefines in ARM are the CCR register.
bool CPSR = false;
if (DefinesOptionalPredicate(MI, &CPSR)) {
if (CPSR)
AddDefaultT1CC(MIB);
else
AddDefaultCC(MIB);
}
return MIB;
}
unsigned ARMFastISel::FastEmitInst_(unsigned MachineInstOpcode,
const TargetRegisterClass* RC) {
unsigned ResultReg = createResultReg(RC);
const MCInstrDesc &II = TII.get(MachineInstOpcode);
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg));
return ResultReg;
}
unsigned ARMFastISel::FastEmitInst_r(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill) {
unsigned ResultReg = createResultReg(RC);
const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1) {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
.addReg(Op0, Op0IsKill * RegState::Kill));
} else {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
.addReg(Op0, Op0IsKill * RegState::Kill));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(TargetOpcode::COPY), ResultReg)
.addReg(II.ImplicitDefs[0]));
}
return ResultReg;
}
unsigned ARMFastISel::FastEmitInst_rr(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill) {
unsigned ResultReg = createResultReg(RC);
const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1) {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addReg(Op1, Op1IsKill * RegState::Kill));
} else {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addReg(Op1, Op1IsKill * RegState::Kill));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(TargetOpcode::COPY), ResultReg)
.addReg(II.ImplicitDefs[0]));
}
return ResultReg;
}
unsigned ARMFastISel::FastEmitInst_rrr(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill,
unsigned Op2, bool Op2IsKill) {
unsigned ResultReg = createResultReg(RC);
const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1) {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addReg(Op1, Op1IsKill * RegState::Kill)
.addReg(Op2, Op2IsKill * RegState::Kill));
} else {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addReg(Op1, Op1IsKill * RegState::Kill)
.addReg(Op2, Op2IsKill * RegState::Kill));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(TargetOpcode::COPY), ResultReg)
.addReg(II.ImplicitDefs[0]));
}
return ResultReg;
}
unsigned ARMFastISel::FastEmitInst_ri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
uint64_t Imm) {
unsigned ResultReg = createResultReg(RC);
const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1) {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addImm(Imm));
} else {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addImm(Imm));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(TargetOpcode::COPY), ResultReg)
.addReg(II.ImplicitDefs[0]));
}
return ResultReg;
}
unsigned ARMFastISel::FastEmitInst_rf(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
const ConstantFP *FPImm) {
unsigned ResultReg = createResultReg(RC);
const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1) {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addFPImm(FPImm));
} else {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addFPImm(FPImm));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(TargetOpcode::COPY), ResultReg)
.addReg(II.ImplicitDefs[0]));
}
return ResultReg;
}
unsigned ARMFastISel::FastEmitInst_rri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill,
uint64_t Imm) {
unsigned ResultReg = createResultReg(RC);
const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1) {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addReg(Op1, Op1IsKill * RegState::Kill)
.addImm(Imm));
} else {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
.addReg(Op0, Op0IsKill * RegState::Kill)
.addReg(Op1, Op1IsKill * RegState::Kill)
.addImm(Imm));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(TargetOpcode::COPY), ResultReg)
.addReg(II.ImplicitDefs[0]));
}
return ResultReg;
}
unsigned ARMFastISel::FastEmitInst_i(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
uint64_t Imm) {
unsigned ResultReg = createResultReg(RC);
const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1) {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
.addImm(Imm));
} else {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
.addImm(Imm));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(TargetOpcode::COPY), ResultReg)
.addReg(II.ImplicitDefs[0]));
}
return ResultReg;
}
unsigned ARMFastISel::FastEmitInst_ii(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
uint64_t Imm1, uint64_t Imm2) {
unsigned ResultReg = createResultReg(RC);
const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1) {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
.addImm(Imm1).addImm(Imm2));
} else {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
.addImm(Imm1).addImm(Imm2));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(TargetOpcode::COPY),
ResultReg)
.addReg(II.ImplicitDefs[0]));
}
return ResultReg;
}
unsigned ARMFastISel::FastEmitInst_extractsubreg(MVT RetVT,
unsigned Op0, bool Op0IsKill,
uint32_t Idx) {
unsigned ResultReg = createResultReg(TLI.getRegClassFor(RetVT));
assert(TargetRegisterInfo::isVirtualRegister(Op0) &&
"Cannot yet extract from physregs");
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
DL, TII.get(TargetOpcode::COPY), ResultReg)
.addReg(Op0, getKillRegState(Op0IsKill), Idx));
return ResultReg;
}
// TODO: Don't worry about 64-bit now, but when this is fixed remove the
// checks from the various callers.
unsigned ARMFastISel::ARMMoveToFPReg(EVT VT, unsigned SrcReg) {
if (VT == MVT::f64) return 0;
unsigned MoveReg = createResultReg(TLI.getRegClassFor(VT));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::VMOVRS), MoveReg)
.addReg(SrcReg));
return MoveReg;
}
unsigned ARMFastISel::ARMMoveToIntReg(EVT VT, unsigned SrcReg) {
if (VT == MVT::i64) return 0;
unsigned MoveReg = createResultReg(TLI.getRegClassFor(VT));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::VMOVSR), MoveReg)
.addReg(SrcReg));
return MoveReg;
}
// For double width floating point we need to materialize two constants
// (the high and the low) into integer registers then use a move to get
// the combined constant into an FP reg.
unsigned ARMFastISel::ARMMaterializeFP(const ConstantFP *CFP, EVT VT) {
const APFloat Val = CFP->getValueAPF();
bool is64bit = VT == MVT::f64;
// This checks to see if we can use VFP3 instructions to materialize
// a constant, otherwise we have to go through the constant pool.
if (TLI.isFPImmLegal(Val, VT)) {
int Imm;
unsigned Opc;
if (is64bit) {
Imm = ARM_AM::getFP64Imm(Val);
Opc = ARM::FCONSTD;
} else {
Imm = ARM_AM::getFP32Imm(Val);
Opc = ARM::FCONSTS;
}
unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
DestReg)
.addImm(Imm));
return DestReg;
}
// Require VFP2 for loading fp constants.
if (!Subtarget->hasVFP2()) return false;
// MachineConstantPool wants an explicit alignment.
unsigned Align = TD.getPrefTypeAlignment(CFP->getType());
if (Align == 0) {
// TODO: Figure out if this is correct.
Align = TD.getTypeAllocSize(CFP->getType());
}
unsigned Idx = MCP.getConstantPoolIndex(cast<Constant>(CFP), Align);
unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
unsigned Opc = is64bit ? ARM::VLDRD : ARM::VLDRS;
// The extra reg is for addrmode5.
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
DestReg)
.addConstantPoolIndex(Idx)
.addReg(0));
return DestReg;
}
unsigned ARMFastISel::ARMMaterializeInt(const Constant *C, EVT VT) {
if (VT != MVT::i32 && VT != MVT::i16 && VT != MVT::i8 && VT != MVT::i1)
return false;
// If we can do this in a single instruction without a constant pool entry
// do so now.
const ConstantInt *CI = cast<ConstantInt>(C);
if (Subtarget->hasV6T2Ops() && isUInt<16>(CI->getZExtValue())) {
unsigned Opc = isThumb2 ? ARM::t2MOVi16 : ARM::MOVi16;
unsigned ImmReg = createResultReg(TLI.getRegClassFor(MVT::i32));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(Opc), ImmReg)
.addImm(CI->getZExtValue()));
return ImmReg;
}
// Use MVN to emit negative constants.
if (VT == MVT::i32 && Subtarget->hasV6T2Ops() && CI->isNegative()) {
unsigned Imm = (unsigned)~(CI->getSExtValue());
bool UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
(ARM_AM::getSOImmVal(Imm) != -1);
if (UseImm) {
unsigned Opc = isThumb2 ? ARM::t2MVNi : ARM::MVNi;
unsigned ImmReg = createResultReg(TLI.getRegClassFor(MVT::i32));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(Opc), ImmReg)
.addImm(Imm));
return ImmReg;
}
}
// Load from constant pool. For now 32-bit only.
if (VT != MVT::i32)
return false;
unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
// MachineConstantPool wants an explicit alignment.
unsigned Align = TD.getPrefTypeAlignment(C->getType());
if (Align == 0) {
// TODO: Figure out if this is correct.
Align = TD.getTypeAllocSize(C->getType());
}
unsigned Idx = MCP.getConstantPoolIndex(C, Align);
if (isThumb2)
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::t2LDRpci), DestReg)
.addConstantPoolIndex(Idx));
else
// The extra immediate is for addrmode2.
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::LDRcp), DestReg)
.addConstantPoolIndex(Idx)
.addImm(0));
return DestReg;
}
unsigned ARMFastISel::ARMMaterializeGV(const GlobalValue *GV, EVT VT) {
// For now 32-bit only.
if (VT != MVT::i32) return 0;
Reloc::Model RelocM = TM.getRelocationModel();
// TODO: Need more magic for ARM PIC.
if (!isThumb2 && (RelocM == Reloc::PIC_)) return 0;
unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
// Use movw+movt when possible, it avoids constant pool entries.
// Darwin targets don't support movt with Reloc::Static, see
// ARMTargetLowering::LowerGlobalAddressDarwin. Other targets only support
// static movt relocations.
if (Subtarget->useMovt() &&
Subtarget->isTargetDarwin() == (RelocM != Reloc::Static)) {
unsigned Opc;
switch (RelocM) {
case Reloc::PIC_:
Opc = isThumb2 ? ARM::t2MOV_ga_pcrel : ARM::MOV_ga_pcrel;
break;
case Reloc::DynamicNoPIC:
Opc = isThumb2 ? ARM::t2MOV_ga_dyn : ARM::MOV_ga_dyn;
break;
default:
Opc = isThumb2 ? ARM::t2MOVi32imm : ARM::MOVi32imm;
break;
}
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
DestReg).addGlobalAddress(GV));
} else {
// MachineConstantPool wants an explicit alignment.
unsigned Align = TD.getPrefTypeAlignment(GV->getType());
if (Align == 0) {
// TODO: Figure out if this is correct.
Align = TD.getTypeAllocSize(GV->getType());
}
// Grab index.
unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 :
(Subtarget->isThumb() ? 4 : 8);
unsigned Id = AFI->createPICLabelUId();
ARMConstantPoolValue *CPV = ARMConstantPoolConstant::Create(GV, Id,
ARMCP::CPValue,
PCAdj);
unsigned Idx = MCP.getConstantPoolIndex(CPV, Align);
// Load value.
MachineInstrBuilder MIB;
if (isThumb2) {
unsigned Opc = (RelocM!=Reloc::PIC_) ? ARM::t2LDRpci : ARM::t2LDRpci_pic;
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc), DestReg)
.addConstantPoolIndex(Idx);
if (RelocM == Reloc::PIC_)
MIB.addImm(Id);
} else {
// The extra immediate is for addrmode2.
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(ARM::LDRcp),
DestReg)
.addConstantPoolIndex(Idx)
.addImm(0);
}
AddOptionalDefs(MIB);
}
if (Subtarget->GVIsIndirectSymbol(GV, RelocM)) {
MachineInstrBuilder MIB;
unsigned NewDestReg = createResultReg(TLI.getRegClassFor(VT));
if (isThumb2)
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::t2LDRi12), NewDestReg)
.addReg(DestReg)
.addImm(0);
else
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(ARM::LDRi12),
NewDestReg)
.addReg(DestReg)
.addImm(0);
DestReg = NewDestReg;
AddOptionalDefs(MIB);
}
return DestReg;
}
unsigned ARMFastISel::TargetMaterializeConstant(const Constant *C) {
EVT VT = TLI.getValueType(C->getType(), true);
// Only handle simple types.
if (!VT.isSimple()) return 0;
if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C))
return ARMMaterializeFP(CFP, VT);
else if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
return ARMMaterializeGV(GV, VT);
else if (isa<ConstantInt>(C))
return ARMMaterializeInt(C, VT);
return 0;
}
// TODO: unsigned ARMFastISel::TargetMaterializeFloatZero(const ConstantFP *CF);
unsigned ARMFastISel::TargetMaterializeAlloca(const AllocaInst *AI) {
// Don't handle dynamic allocas.
if (!FuncInfo.StaticAllocaMap.count(AI)) return 0;
MVT VT;
if (!isLoadTypeLegal(AI->getType(), VT)) return false;
DenseMap<const AllocaInst*, int>::iterator SI =
FuncInfo.StaticAllocaMap.find(AI);
// This will get lowered later into the correct offsets and registers
// via rewriteXFrameIndex.
if (SI != FuncInfo.StaticAllocaMap.end()) {
const TargetRegisterClass* RC = TLI.getRegClassFor(VT);
unsigned ResultReg = createResultReg(RC);
unsigned Opc = isThumb2 ? ARM::t2ADDri : ARM::ADDri;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(Opc), ResultReg)
.addFrameIndex(SI->second)
.addImm(0));
return ResultReg;
}
return 0;
}
bool ARMFastISel::isTypeLegal(Type *Ty, MVT &VT) {
EVT evt = TLI.getValueType(Ty, true);
// Only handle simple types.
if (evt == MVT::Other || !evt.isSimple()) return false;
VT = evt.getSimpleVT();
// Handle all legal types, i.e. a register that will directly hold this
// value.
return TLI.isTypeLegal(VT);
}
bool ARMFastISel::isLoadTypeLegal(Type *Ty, MVT &VT) {
if (isTypeLegal(Ty, VT)) return true;
// If this is a type than can be sign or zero-extended to a basic operation
// go ahead and accept it now.
if (VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16)
return true;
return false;
}
// Computes the address to get to an object.
bool ARMFastISel::ARMComputeAddress(const Value *Obj, Address &Addr) {
// Some boilerplate from the X86 FastISel.
const User *U = NULL;
unsigned Opcode = Instruction::UserOp1;
if (const Instruction *I = dyn_cast<Instruction>(Obj)) {
// Don't walk into other basic blocks unless the object is an alloca from
// another block, otherwise it may not have a virtual register assigned.
if (FuncInfo.StaticAllocaMap.count(static_cast<const AllocaInst *>(Obj)) ||
FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
Opcode = I->getOpcode();
U = I;
}
} else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(Obj)) {
Opcode = C->getOpcode();
U = C;
}
if (PointerType *Ty = dyn_cast<PointerType>(Obj->getType()))
if (Ty->getAddressSpace() > 255)
// Fast instruction selection doesn't support the special
// address spaces.
return false;
switch (Opcode) {
default:
break;
case Instruction::BitCast: {
// Look through bitcasts.
return ARMComputeAddress(U->getOperand(0), Addr);
}
case Instruction::IntToPtr: {
// Look past no-op inttoptrs.
if (TLI.getValueType(U->getOperand(0)->getType()) == TLI.getPointerTy())
return ARMComputeAddress(U->getOperand(0), Addr);
break;
}
case Instruction::PtrToInt: {
// Look past no-op ptrtoints.
if (TLI.getValueType(U->getType()) == TLI.getPointerTy())
return ARMComputeAddress(U->getOperand(0), Addr);
break;
}
case Instruction::GetElementPtr: {
Address SavedAddr = Addr;
int TmpOffset = Addr.Offset;
// Iterate through the GEP folding the constants into offsets where
// we can.
gep_type_iterator GTI = gep_type_begin(U);
for (User::const_op_iterator i = U->op_begin() + 1, e = U->op_end();
i != e; ++i, ++GTI) {
const Value *Op = *i;
if (StructType *STy = dyn_cast<StructType>(*GTI)) {
const StructLayout *SL = TD.getStructLayout(STy);
unsigned Idx = cast<ConstantInt>(Op)->getZExtValue();
TmpOffset += SL->getElementOffset(Idx);
} else {
uint64_t S = TD.getTypeAllocSize(GTI.getIndexedType());
for (;;) {
if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
// Constant-offset addressing.
TmpOffset += CI->getSExtValue() * S;
break;
}
if (isa<AddOperator>(Op) &&
(!isa<Instruction>(Op) ||
FuncInfo.MBBMap[cast<Instruction>(Op)->getParent()]
== FuncInfo.MBB) &&
isa<ConstantInt>(cast<AddOperator>(Op)->getOperand(1))) {
// An add (in the same block) with a constant operand. Fold the
// constant.
ConstantInt *CI =
cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
TmpOffset += CI->getSExtValue() * S;
// Iterate on the other operand.
Op = cast<AddOperator>(Op)->getOperand(0);
continue;
}
// Unsupported
goto unsupported_gep;
}
}
}
// Try to grab the base operand now.
Addr.Offset = TmpOffset;
if (ARMComputeAddress(U->getOperand(0), Addr)) return true;
// We failed, restore everything and try the other options.
Addr = SavedAddr;
unsupported_gep:
break;
}
case Instruction::Alloca: {
const AllocaInst *AI = cast<AllocaInst>(Obj);
DenseMap<const AllocaInst*, int>::iterator SI =
FuncInfo.StaticAllocaMap.find(AI);
if (SI != FuncInfo.StaticAllocaMap.end()) {
Addr.BaseType = Address::FrameIndexBase;
Addr.Base.FI = SI->second;
return true;
}
break;
}
}
// Try to get this in a register if nothing else has worked.
if (Addr.Base.Reg == 0) Addr.Base.Reg = getRegForValue(Obj);
return Addr.Base.Reg != 0;
}
void ARMFastISel::ARMSimplifyAddress(Address &Addr, EVT VT, bool useAM3) {
assert(VT.isSimple() && "Non-simple types are invalid here!");
bool needsLowering = false;
switch (VT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Unhandled load/store type!");
case MVT::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
if (!useAM3) {
// Integer loads/stores handle 12-bit offsets.
needsLowering = ((Addr.Offset & 0xfff) != Addr.Offset);
// Handle negative offsets.
if (needsLowering && isThumb2)
needsLowering = !(Subtarget->hasV6T2Ops() && Addr.Offset < 0 &&
Addr.Offset > -256);
} else {
// ARM halfword load/stores and signed byte loads use +/-imm8 offsets.
needsLowering = (Addr.Offset > 255 || Addr.Offset < -255);
}
break;
case MVT::f32:
case MVT::f64:
// Floating point operands handle 8-bit offsets.
needsLowering = ((Addr.Offset & 0xff) != Addr.Offset);
break;
}
// If this is a stack pointer and the offset needs to be simplified then
// put the alloca address into a register, set the base type back to
// register and continue. This should almost never happen.
if (needsLowering && Addr.BaseType == Address::FrameIndexBase) {
const TargetRegisterClass *RC = isThumb2 ? ARM::tGPRRegisterClass
: ARM::GPRRegisterClass;
unsigned ResultReg = createResultReg(RC);
unsigned Opc = isThumb2 ? ARM::t2ADDri : ARM::ADDri;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(Opc), ResultReg)
.addFrameIndex(Addr.Base.FI)
.addImm(0));
Addr.Base.Reg = ResultReg;
Addr.BaseType = Address::RegBase;
}
// Since the offset is too large for the load/store instruction
// get the reg+offset into a register.
if (needsLowering) {
Addr.Base.Reg = FastEmit_ri_(MVT::i32, ISD::ADD, Addr.Base.Reg,
/*Op0IsKill*/false, Addr.Offset, MVT::i32);
Addr.Offset = 0;
}
}
void ARMFastISel::AddLoadStoreOperands(EVT VT, Address &Addr,
const MachineInstrBuilder &MIB,
unsigned Flags, bool useAM3) {
// addrmode5 output depends on the selection dag addressing dividing the
// offset by 4 that it then later multiplies. Do this here as well.
if (VT.getSimpleVT().SimpleTy == MVT::f32 ||
VT.getSimpleVT().SimpleTy == MVT::f64)
Addr.Offset /= 4;
// Frame base works a bit differently. Handle it separately.
if (Addr.BaseType == Address::FrameIndexBase) {
int FI = Addr.Base.FI;
int Offset = Addr.Offset;
MachineMemOperand *MMO =
FuncInfo.MF->getMachineMemOperand(
MachinePointerInfo::getFixedStack(FI, Offset),
Flags,
MFI.getObjectSize(FI),
MFI.getObjectAlignment(FI));
// Now add the rest of the operands.
MIB.addFrameIndex(FI);
// ARM halfword load/stores and signed byte loads need an additional
// operand.
if (useAM3) {
signed Imm = (Addr.Offset < 0) ? (0x100 | -Addr.Offset) : Addr.Offset;
MIB.addReg(0);
MIB.addImm(Imm);
} else {
MIB.addImm(Addr.Offset);
}
MIB.addMemOperand(MMO);
} else {
// Now add the rest of the operands.
MIB.addReg(Addr.Base.Reg);
// ARM halfword load/stores and signed byte loads need an additional
// operand.
if (useAM3) {
signed Imm = (Addr.Offset < 0) ? (0x100 | -Addr.Offset) : Addr.Offset;
MIB.addReg(0);
MIB.addImm(Imm);
} else {
MIB.addImm(Addr.Offset);
}
}
AddOptionalDefs(MIB);
}
bool ARMFastISel::ARMEmitLoad(EVT VT, unsigned &ResultReg, Address &Addr,
unsigned Alignment, bool isZExt, bool allocReg) {
assert(VT.isSimple() && "Non-simple types are invalid here!");
unsigned Opc;
bool useAM3 = false;
bool needVMOV = false;
const TargetRegisterClass *RC;
switch (VT.getSimpleVT().SimpleTy) {
// This is mostly going to be Neon/vector support.
default: return false;
case MVT::i1:
case MVT::i8:
if (isThumb2) {
if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
Opc = isZExt ? ARM::t2LDRBi8 : ARM::t2LDRSBi8;
else
Opc = isZExt ? ARM::t2LDRBi12 : ARM::t2LDRSBi12;
} else {
if (isZExt) {
Opc = ARM::LDRBi12;
} else {
Opc = ARM::LDRSB;
useAM3 = true;
}
}
RC = ARM::GPRRegisterClass;
break;
case MVT::i16:
if (isThumb2) {
if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
Opc = isZExt ? ARM::t2LDRHi8 : ARM::t2LDRSHi8;
else
Opc = isZExt ? ARM::t2LDRHi12 : ARM::t2LDRSHi12;
} else {
Opc = isZExt ? ARM::LDRH : ARM::LDRSH;
useAM3 = true;
}
RC = ARM::GPRRegisterClass;
break;
case MVT::i32:
if (isThumb2) {
if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
Opc = ARM::t2LDRi8;
else
Opc = ARM::t2LDRi12;
} else {
Opc = ARM::LDRi12;
}
RC = ARM::GPRRegisterClass;
break;
case MVT::f32:
if (!Subtarget->hasVFP2()) return false;
// Unaligned loads need special handling. Floats require word-alignment.
if (Alignment && Alignment < 4) {
needVMOV = true;
VT = MVT::i32;
Opc = isThumb2 ? ARM::t2LDRi12 : ARM::LDRi12;
RC = ARM::GPRRegisterClass;
} else {
Opc = ARM::VLDRS;
RC = TLI.getRegClassFor(VT);
}
break;
case MVT::f64:
if (!Subtarget->hasVFP2()) return false;
// FIXME: Unaligned loads need special handling. Doublewords require
// word-alignment.
if (Alignment && Alignment < 4)
return false;
Opc = ARM::VLDRD;
RC = TLI.getRegClassFor(VT);
break;
}
// Simplify this down to something we can handle.
ARMSimplifyAddress(Addr, VT, useAM3);
// Create the base instruction, then add the operands.
if (allocReg)
ResultReg = createResultReg(RC);
assert (ResultReg > 255 && "Expected an allocated virtual register.");
MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(Opc), ResultReg);
AddLoadStoreOperands(VT, Addr, MIB, MachineMemOperand::MOLoad, useAM3);
// If we had an unaligned load of a float we've converted it to an regular
// load. Now we must move from the GRP to the FP register.
if (needVMOV) {
unsigned MoveReg = createResultReg(TLI.getRegClassFor(MVT::f32));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::VMOVSR), MoveReg)
.addReg(ResultReg));
ResultReg = MoveReg;
}
return true;
}
bool ARMFastISel::SelectLoad(const Instruction *I) {
// Atomic loads need special handling.
if (cast<LoadInst>(I)->isAtomic())
return false;
// Verify we have a legal type before going any further.
MVT VT;
if (!isLoadTypeLegal(I->getType(), VT))
return false;
// See if we can handle this address.
Address Addr;
if (!ARMComputeAddress(I->getOperand(0), Addr)) return false;
unsigned ResultReg;
if (!ARMEmitLoad(VT, ResultReg, Addr, cast<LoadInst>(I)->getAlignment()))
return false;
UpdateValueMap(I, ResultReg);
return true;
}
bool ARMFastISel::ARMEmitStore(EVT VT, unsigned SrcReg, Address &Addr,
unsigned Alignment) {
unsigned StrOpc;
bool useAM3 = false;
switch (VT.getSimpleVT().SimpleTy) {
// This is mostly going to be Neon/vector support.
default: return false;
case MVT::i1: {
unsigned Res = createResultReg(isThumb2 ? ARM::tGPRRegisterClass :
ARM::GPRRegisterClass);
unsigned Opc = isThumb2 ? ARM::t2ANDri : ARM::ANDri;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(Opc), Res)
.addReg(SrcReg).addImm(1));
SrcReg = Res;
} // Fallthrough here.
case MVT::i8:
if (isThumb2) {
if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
StrOpc = ARM::t2STRBi8;
else
StrOpc = ARM::t2STRBi12;
} else {
StrOpc = ARM::STRBi12;
}
break;
case MVT::i16:
if (isThumb2) {
if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
StrOpc = ARM::t2STRHi8;
else
StrOpc = ARM::t2STRHi12;
} else {
StrOpc = ARM::STRH;
useAM3 = true;
}
break;
case MVT::i32:
if (isThumb2) {
if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
StrOpc = ARM::t2STRi8;
else
StrOpc = ARM::t2STRi12;
} else {
StrOpc = ARM::STRi12;
}
break;
case MVT::f32:
if (!Subtarget->hasVFP2()) return false;
// Unaligned stores need special handling. Floats require word-alignment.
if (Alignment && Alignment < 4) {
unsigned MoveReg = createResultReg(TLI.getRegClassFor(MVT::i32));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::VMOVRS), MoveReg)
.addReg(SrcReg));
SrcReg = MoveReg;
VT = MVT::i32;
StrOpc = isThumb2 ? ARM::t2STRi12 : ARM::STRi12;
} else {
StrOpc = ARM::VSTRS;
}
break;
case MVT::f64:
if (!Subtarget->hasVFP2()) return false;
// FIXME: Unaligned stores need special handling. Doublewords require
// word-alignment.
if (Alignment && Alignment < 4)
return false;
StrOpc = ARM::VSTRD;
break;
}
// Simplify this down to something we can handle.
ARMSimplifyAddress(Addr, VT, useAM3);
// Create the base instruction, then add the operands.
MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(StrOpc))
.addReg(SrcReg);
AddLoadStoreOperands(VT, Addr, MIB, MachineMemOperand::MOStore, useAM3);
return true;
}
bool ARMFastISel::SelectStore(const Instruction *I) {
Value *Op0 = I->getOperand(0);
unsigned SrcReg = 0;
// Atomic stores need special handling.
if (cast<StoreInst>(I)->isAtomic())
return false;
// Verify we have a legal type before going any further.
MVT VT;
if (!isLoadTypeLegal(I->getOperand(0)->getType(), VT))
return false;
// Get the value to be stored into a register.
SrcReg = getRegForValue(Op0);
if (SrcReg == 0) return false;
// See if we can handle this address.
Address Addr;
if (!ARMComputeAddress(I->getOperand(1), Addr))
return false;
if (!ARMEmitStore(VT, SrcReg, Addr, cast<StoreInst>(I)->getAlignment()))
return false;
return true;
}
static ARMCC::CondCodes getComparePred(CmpInst::Predicate Pred) {
switch (Pred) {
// Needs two compares...
case CmpInst::FCMP_ONE:
case CmpInst::FCMP_UEQ:
default:
// AL is our "false" for now. The other two need more compares.
return ARMCC::AL;
case CmpInst::ICMP_EQ:
case CmpInst::FCMP_OEQ:
return ARMCC::EQ;
case CmpInst::ICMP_SGT:
case CmpInst::FCMP_OGT:
return ARMCC::GT;
case CmpInst::ICMP_SGE:
case CmpInst::FCMP_OGE:
return ARMCC::GE;
case CmpInst::ICMP_UGT:
case CmpInst::FCMP_UGT:
return ARMCC::HI;
case CmpInst::FCMP_OLT:
return ARMCC::MI;
case CmpInst::ICMP_ULE:
case CmpInst::FCMP_OLE:
return ARMCC::LS;
case CmpInst::FCMP_ORD:
return ARMCC::VC;
case CmpInst::FCMP_UNO:
return ARMCC::VS;
case CmpInst::FCMP_UGE:
return ARMCC::PL;
case CmpInst::ICMP_SLT:
case CmpInst::FCMP_ULT:
return ARMCC::LT;
case CmpInst::ICMP_SLE:
case CmpInst::FCMP_ULE:
return ARMCC::LE;
case CmpInst::FCMP_UNE:
case CmpInst::ICMP_NE:
return ARMCC::NE;
case CmpInst::ICMP_UGE:
return ARMCC::HS;
case CmpInst::ICMP_ULT:
return ARMCC::LO;
}
}
bool ARMFastISel::SelectBranch(const Instruction *I) {
const BranchInst *BI = cast<BranchInst>(I);
MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
// Simple branch support.
// If we can, avoid recomputing the compare - redoing it could lead to wonky
// behavior.
if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
if (CI->hasOneUse() && (CI->getParent() == I->getParent())) {
// Get the compare predicate.
// Try to take advantage of fallthrough opportunities.
CmpInst::Predicate Predicate = CI->getPredicate();
if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
std::swap(TBB, FBB);
Predicate = CmpInst::getInversePredicate(Predicate);
}
ARMCC::CondCodes ARMPred = getComparePred(Predicate);
// We may not handle every CC for now.
if (ARMPred == ARMCC::AL) return false;
// Emit the compare.
if (!ARMEmitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
return false;
unsigned BrOpc = isThumb2 ? ARM::t2Bcc : ARM::Bcc;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
.addMBB(TBB).addImm(ARMPred).addReg(ARM::CPSR);
FastEmitBranch(FBB, DL);
FuncInfo.MBB->addSuccessor(TBB);
return true;
}
} else if (TruncInst *TI = dyn_cast<TruncInst>(BI->getCondition())) {
MVT SourceVT;
if (TI->hasOneUse() && TI->getParent() == I->getParent() &&
(isLoadTypeLegal(TI->getOperand(0)->getType(), SourceVT))) {
unsigned TstOpc = isThumb2 ? ARM::t2TSTri : ARM::TSTri;
unsigned OpReg = getRegForValue(TI->getOperand(0));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(TstOpc))
.addReg(OpReg).addImm(1));
unsigned CCMode = ARMCC::NE;
if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
std::swap(TBB, FBB);
CCMode = ARMCC::EQ;
}
unsigned BrOpc = isThumb2 ? ARM::t2Bcc : ARM::Bcc;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
.addMBB(TBB).addImm(CCMode).addReg(ARM::CPSR);
FastEmitBranch(FBB, DL);
FuncInfo.MBB->addSuccessor(TBB);
return true;
}
} else if (const ConstantInt *CI =
dyn_cast<ConstantInt>(BI->getCondition())) {
uint64_t Imm = CI->getZExtValue();
MachineBasicBlock *Target = (Imm == 0) ? FBB : TBB;
FastEmitBranch(Target, DL);
return true;
}
unsigned CmpReg = getRegForValue(BI->getCondition());
if (CmpReg == 0) return false;
// We've been divorced from our compare! Our block was split, and
// now our compare lives in a predecessor block. We musn't
// re-compare here, as the children of the compare aren't guaranteed
// live across the block boundary (we *could* check for this).
// Regardless, the compare has been done in the predecessor block,
// and it left a value for us in a virtual register. Ergo, we test
// the one-bit value left in the virtual register.
unsigned TstOpc = isThumb2 ? ARM::t2TSTri : ARM::TSTri;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TstOpc))
.addReg(CmpReg).addImm(1));
unsigned CCMode = ARMCC::NE;
if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
std::swap(TBB, FBB);
CCMode = ARMCC::EQ;
}
unsigned BrOpc = isThumb2 ? ARM::t2Bcc : ARM::Bcc;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
.addMBB(TBB).addImm(CCMode).addReg(ARM::CPSR);
FastEmitBranch(FBB, DL);
FuncInfo.MBB->addSuccessor(TBB);
return true;
}
bool ARMFastISel::SelectIndirectBr(const Instruction *I) {
unsigned AddrReg = getRegForValue(I->getOperand(0));
if (AddrReg == 0) return false;
unsigned Opc = isThumb2 ? ARM::tBRIND : ARM::BX;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc))
.addReg(AddrReg));
return true;
}
bool ARMFastISel::ARMEmitCmp(const Value *Src1Value, const Value *Src2Value,
bool isZExt) {
Type *Ty = Src1Value->getType();
EVT SrcVT = TLI.getValueType(Ty, true);
if (!SrcVT.isSimple()) return false;
bool isFloat = (Ty->isFloatTy() || Ty->isDoubleTy());
if (isFloat && !Subtarget->hasVFP2())
return false;
// Check to see if the 2nd operand is a constant that we can encode directly
// in the compare.
int Imm = 0;
bool UseImm = false;
bool isNegativeImm = false;
// FIXME: At -O0 we don't have anything that canonicalizes operand order.
// Thus, Src1Value may be a ConstantInt, but we're missing it.
if (const ConstantInt *ConstInt = dyn_cast<ConstantInt>(Src2Value)) {
if (SrcVT == MVT::i32 || SrcVT == MVT::i16 || SrcVT == MVT::i8 ||
SrcVT == MVT::i1) {
const APInt &CIVal = ConstInt->getValue();
Imm = (isZExt) ? (int)CIVal.getZExtValue() : (int)CIVal.getSExtValue();
if (Imm < 0) {
isNegativeImm = true;
Imm = -Imm;
}
UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
(ARM_AM::getSOImmVal(Imm) != -1);
}
} else if (const ConstantFP *ConstFP = dyn_cast<ConstantFP>(Src2Value)) {
if (SrcVT == MVT::f32 || SrcVT == MVT::f64)
if (ConstFP->isZero() && !ConstFP->isNegative())
UseImm = true;
}
unsigned CmpOpc;
bool isICmp = true;
bool needsExt = false;
switch (SrcVT.getSimpleVT().SimpleTy) {
default: return false;
// TODO: Verify compares.
case MVT::f32:
isICmp = false;
CmpOpc = UseImm ? ARM::VCMPEZS : ARM::VCMPES;
break;
case MVT::f64:
isICmp = false;
CmpOpc = UseImm ? ARM::VCMPEZD : ARM::VCMPED;
break;
case MVT::i1:
case MVT::i8:
case MVT::i16:
needsExt = true;
// Intentional fall-through.
case MVT::i32:
if (isThumb2) {
if (!UseImm)
CmpOpc = ARM::t2CMPrr;
else
CmpOpc = isNegativeImm ? ARM::t2CMNzri : ARM::t2CMPri;
} else {
if (!UseImm)
CmpOpc = ARM::CMPrr;
else
CmpOpc = isNegativeImm ? ARM::CMNzri : ARM::CMPri;
}
break;
}
unsigned SrcReg1 = getRegForValue(Src1Value);
if (SrcReg1 == 0) return false;
unsigned SrcReg2 = 0;
if (!UseImm) {
SrcReg2 = getRegForValue(Src2Value);
if (SrcReg2 == 0) return false;
}
// We have i1, i8, or i16, we need to either zero extend or sign extend.
if (needsExt) {
SrcReg1 = ARMEmitIntExt(SrcVT, SrcReg1, MVT::i32, isZExt);
if (SrcReg1 == 0) return false;
if (!UseImm) {
SrcReg2 = ARMEmitIntExt(SrcVT, SrcReg2, MVT::i32, isZExt);
if (SrcReg2 == 0) return false;
}
}
if (!UseImm) {
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(CmpOpc))
.addReg(SrcReg1).addReg(SrcReg2));
} else {
MachineInstrBuilder MIB;
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
.addReg(SrcReg1);
// Only add immediate for icmp as the immediate for fcmp is an implicit 0.0.
if (isICmp)
MIB.addImm(Imm);
AddOptionalDefs(MIB);
}
// For floating point we need to move the result to a comparison register
// that we can then use for branches.
if (Ty->isFloatTy() || Ty->isDoubleTy())
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::FMSTAT)));
return true;
}
bool ARMFastISel::SelectCmp(const Instruction *I) {
const CmpInst *CI = cast<CmpInst>(I);
Type *Ty = CI->getOperand(0)->getType();
// Get the compare predicate.
ARMCC::CondCodes ARMPred = getComparePred(CI->getPredicate());
// We may not handle every CC for now.
if (ARMPred == ARMCC::AL) return false;
// Emit the compare.
if (!ARMEmitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
return false;
// Now set a register based on the comparison. Explicitly set the predicates
// here.
unsigned MovCCOpc = isThumb2 ? ARM::t2MOVCCi : ARM::MOVCCi;
const TargetRegisterClass *RC = isThumb2 ? ARM::rGPRRegisterClass
: ARM::GPRRegisterClass;
unsigned DestReg = createResultReg(RC);
Constant *Zero = ConstantInt::get(Type::getInt32Ty(*Context), 0);
unsigned ZeroReg = TargetMaterializeConstant(Zero);
bool isFloat = (Ty->isFloatTy() || Ty->isDoubleTy());
unsigned CondReg = isFloat ? ARM::FPSCR : ARM::CPSR;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), DestReg)
.addReg(ZeroReg).addImm(1)
.addImm(ARMPred).addReg(CondReg);
UpdateValueMap(I, DestReg);
return true;
}
bool ARMFastISel::SelectFPExt(const Instruction *I) {
// Make sure we have VFP and that we're extending float to double.
if (!Subtarget->hasVFP2()) return false;
Value *V = I->getOperand(0);
if (!I->getType()->isDoubleTy() ||
!V->getType()->isFloatTy()) return false;
unsigned Op = getRegForValue(V);
if (Op == 0) return false;
unsigned Result = createResultReg(ARM::DPRRegisterClass);
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::VCVTDS), Result)
.addReg(Op));
UpdateValueMap(I, Result);
return true;
}
bool ARMFastISel::SelectFPTrunc(const Instruction *I) {
// Make sure we have VFP and that we're truncating double to float.
if (!Subtarget->hasVFP2()) return false;
Value *V = I->getOperand(0);
if (!(I->getType()->isFloatTy() &&
V->getType()->isDoubleTy())) return false;
unsigned Op = getRegForValue(V);
if (Op == 0) return false;
unsigned Result = createResultReg(ARM::SPRRegisterClass);
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::VCVTSD), Result)
.addReg(Op));
UpdateValueMap(I, Result);
return true;
}
bool ARMFastISel::SelectIToFP(const Instruction *I, bool isSigned) {
// Make sure we have VFP.
if (!Subtarget->hasVFP2()) return false;
MVT DstVT;
Type *Ty = I->getType();
if (!isTypeLegal(Ty, DstVT))
return false;
Value *Src = I->getOperand(0);
EVT SrcVT = TLI.getValueType(Src->getType(), true);
if (SrcVT != MVT::i32 && SrcVT != MVT::i16 && SrcVT != MVT::i8)
return false;
unsigned SrcReg = getRegForValue(Src);
if (SrcReg == 0) return false;
// Handle sign-extension.
if (SrcVT == MVT::i16 || SrcVT == MVT::i8) {
EVT DestVT = MVT::i32;
SrcReg = ARMEmitIntExt(SrcVT, SrcReg, DestVT,
/*isZExt*/!isSigned);
if (SrcReg == 0) return false;
}
// The conversion routine works on fp-reg to fp-reg and the operand above
// was an integer, move it to the fp registers if possible.
unsigned FP = ARMMoveToFPReg(MVT::f32, SrcReg);
if (FP == 0) return false;
unsigned Opc;
if (Ty->isFloatTy()) Opc = isSigned ? ARM::VSITOS : ARM::VUITOS;
else if (Ty->isDoubleTy()) Opc = isSigned ? ARM::VSITOD : ARM::VUITOD;
else return false;
unsigned ResultReg = createResultReg(TLI.getRegClassFor(DstVT));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
ResultReg)
.addReg(FP));
UpdateValueMap(I, ResultReg);
return true;
}
bool ARMFastISel::SelectFPToI(const Instruction *I, bool isSigned) {
// Make sure we have VFP.
if (!Subtarget->hasVFP2()) return false;
MVT DstVT;
Type *RetTy = I->getType();
if (!isTypeLegal(RetTy, DstVT))
return false;
unsigned Op = getRegForValue(I->getOperand(0));
if (Op == 0) return false;
unsigned Opc;
Type *OpTy = I->getOperand(0)->getType();
if (OpTy->isFloatTy()) Opc = isSigned ? ARM::VTOSIZS : ARM::VTOUIZS;
else if (OpTy->isDoubleTy()) Opc = isSigned ? ARM::VTOSIZD : ARM::VTOUIZD;
else return false;
// f64->s32/u32 or f32->s32/u32 both need an intermediate f32 reg.
unsigned ResultReg = createResultReg(TLI.getRegClassFor(MVT::f32));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
ResultReg)
.addReg(Op));
// This result needs to be in an integer register, but the conversion only
// takes place in fp-regs.
unsigned IntReg = ARMMoveToIntReg(DstVT, ResultReg);
if (IntReg == 0) return false;
UpdateValueMap(I, IntReg);
return true;
}
bool ARMFastISel::SelectSelect(const Instruction *I) {
MVT VT;
if (!isTypeLegal(I->getType(), VT))
return false;
// Things need to be register sized for register moves.
if (VT != MVT::i32) return false;
const TargetRegisterClass *RC = TLI.getRegClassFor(VT);
unsigned CondReg = getRegForValue(I->getOperand(0));
if (CondReg == 0) return false;
unsigned Op1Reg = getRegForValue(I->getOperand(1));
if (Op1Reg == 0) return false;
// Check to see if we can use an immediate in the conditional move.
int Imm = 0;
bool UseImm = false;
bool isNegativeImm = false;
if (const ConstantInt *ConstInt = dyn_cast<ConstantInt>(I->getOperand(2))) {
assert (VT == MVT::i32 && "Expecting an i32.");
Imm = (int)ConstInt->getValue().getZExtValue();
if (Imm < 0) {
isNegativeImm = true;
Imm = ~Imm;
}
UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
(ARM_AM::getSOImmVal(Imm) != -1);
}
unsigned Op2Reg = 0;
if (!UseImm) {
Op2Reg = getRegForValue(I->getOperand(2));
if (Op2Reg == 0) return false;
}
unsigned CmpOpc = isThumb2 ? ARM::t2CMPri : ARM::CMPri;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
.addReg(CondReg).addImm(0));
unsigned MovCCOpc;
if (!UseImm) {
MovCCOpc = isThumb2 ? ARM::t2MOVCCr : ARM::MOVCCr;
} else {
if (!isNegativeImm) {
MovCCOpc = isThumb2 ? ARM::t2MOVCCi : ARM::MOVCCi;
} else {
MovCCOpc = isThumb2 ? ARM::t2MVNCCi : ARM::MVNCCi;
}
}
unsigned ResultReg = createResultReg(RC);
if (!UseImm)
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), ResultReg)
.addReg(Op2Reg).addReg(Op1Reg).addImm(ARMCC::NE).addReg(ARM::CPSR);
else
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), ResultReg)
.addReg(Op1Reg).addImm(Imm).addImm(ARMCC::EQ).addReg(ARM::CPSR);
UpdateValueMap(I, ResultReg);
return true;
}
bool ARMFastISel::SelectDiv(const Instruction *I, bool isSigned) {
MVT VT;
Type *Ty = I->getType();
if (!isTypeLegal(Ty, VT))
return false;
// If we have integer div support we should have selected this automagically.
// In case we have a real miss go ahead and return false and we'll pick
// it up later.
if (Subtarget->hasDivide()) return false;
// Otherwise emit a libcall.
RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
if (VT == MVT::i8)
LC = isSigned ? RTLIB::SDIV_I8 : RTLIB::UDIV_I8;
else if (VT == MVT::i16)
LC = isSigned ? RTLIB::SDIV_I16 : RTLIB::UDIV_I16;
else if (VT == MVT::i32)
LC = isSigned ? RTLIB::SDIV_I32 : RTLIB::UDIV_I32;
else if (VT == MVT::i64)
LC = isSigned ? RTLIB::SDIV_I64 : RTLIB::UDIV_I64;
else if (VT == MVT::i128)
LC = isSigned ? RTLIB::SDIV_I128 : RTLIB::UDIV_I128;
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SDIV!");
return ARMEmitLibcall(I, LC);
}
bool ARMFastISel::SelectRem(const Instruction *I, bool isSigned) {
MVT VT;
Type *Ty = I->getType();
if (!isTypeLegal(Ty, VT))
return false;
RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
if (VT == MVT::i8)
LC = isSigned ? RTLIB::SREM_I8 : RTLIB::UREM_I8;
else if (VT == MVT::i16)
LC = isSigned ? RTLIB::SREM_I16 : RTLIB::UREM_I16;
else if (VT == MVT::i32)
LC = isSigned ? RTLIB::SREM_I32 : RTLIB::UREM_I32;
else if (VT == MVT::i64)
LC = isSigned ? RTLIB::SREM_I64 : RTLIB::UREM_I64;
else if (VT == MVT::i128)
LC = isSigned ? RTLIB::SREM_I128 : RTLIB::UREM_I128;
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SREM!");
return ARMEmitLibcall(I, LC);
}
bool ARMFastISel::SelectBinaryIntOp(const Instruction *I, unsigned ISDOpcode) {
EVT DestVT = TLI.getValueType(I->getType(), true);
// We can get here in the case when we have a binary operation on a non-legal
// type and the target independent selector doesn't know how to handle it.
if (DestVT != MVT::i16 && DestVT != MVT::i8 && DestVT != MVT::i1)
return false;
unsigned Opc;
switch (ISDOpcode) {
default: return false;
case ISD::ADD:
Opc = isThumb2 ? ARM::t2ADDrr : ARM::ADDrr;
break;
case ISD::OR:
Opc = isThumb2 ? ARM::t2ORRrr : ARM::ORRrr;
break;
case ISD::SUB:
Opc = isThumb2 ? ARM::t2SUBrr : ARM::SUBrr;
break;
}
unsigned SrcReg1 = getRegForValue(I->getOperand(0));
if (SrcReg1 == 0) return false;
// TODO: Often the 2nd operand is an immediate, which can be encoded directly
// in the instruction, rather then materializing the value in a register.
unsigned SrcReg2 = getRegForValue(I->getOperand(1));
if (SrcReg2 == 0) return false;
unsigned ResultReg = createResultReg(TLI.getRegClassFor(MVT::i32));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(Opc), ResultReg)
.addReg(SrcReg1).addReg(SrcReg2));
UpdateValueMap(I, ResultReg);
return true;
}
bool ARMFastISel::SelectBinaryFPOp(const Instruction *I, unsigned ISDOpcode) {
EVT VT = TLI.getValueType(I->getType(), true);
// We can get here in the case when we want to use NEON for our fp
// operations, but can't figure out how to. Just use the vfp instructions
// if we have them.
// FIXME: It'd be nice to use NEON instructions.
Type *Ty = I->getType();
bool isFloat = (Ty->isDoubleTy() || Ty->isFloatTy());
if (isFloat && !Subtarget->hasVFP2())
return false;
unsigned Opc;
bool is64bit = VT == MVT::f64 || VT == MVT::i64;
switch (ISDOpcode) {
default: return false;
case ISD::FADD:
Opc = is64bit ? ARM::VADDD : ARM::VADDS;
break;
case ISD::FSUB:
Opc = is64bit ? ARM::VSUBD : ARM::VSUBS;
break;
case ISD::FMUL:
Opc = is64bit ? ARM::VMULD : ARM::VMULS;
break;
}
unsigned Op1 = getRegForValue(I->getOperand(0));
if (Op1 == 0) return false;
unsigned Op2 = getRegForValue(I->getOperand(1));
if (Op2 == 0) return false;
unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(Opc), ResultReg)
.addReg(Op1).addReg(Op2));
UpdateValueMap(I, ResultReg);
return true;
}
// Call Handling Code
// This is largely taken directly from CCAssignFnForNode - we don't support
// varargs in FastISel so that part has been removed.
// TODO: We may not support all of this.
CCAssignFn *ARMFastISel::CCAssignFnForCall(CallingConv::ID CC, bool Return) {
switch (CC) {
default:
llvm_unreachable("Unsupported calling convention");
case CallingConv::Fast:
// Ignore fastcc. Silence compiler warnings.
(void)RetFastCC_ARM_APCS;
(void)FastCC_ARM_APCS;
// Fallthrough
case CallingConv::C:
// Use target triple & subtarget features to do actual dispatch.
if (Subtarget->isAAPCS_ABI()) {
if (Subtarget->hasVFP2() &&
TM.Options.FloatABIType == FloatABI::Hard)
return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
else
return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
} else
return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
case CallingConv::ARM_AAPCS_VFP:
return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
case CallingConv::ARM_AAPCS:
return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
case CallingConv::ARM_APCS:
return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
}
}
bool ARMFastISel::ProcessCallArgs(SmallVectorImpl<Value*> &Args,
SmallVectorImpl<unsigned> &ArgRegs,
SmallVectorImpl<MVT> &ArgVTs,
SmallVectorImpl<ISD::ArgFlagsTy> &ArgFlags,
SmallVectorImpl<unsigned> &RegArgs,
CallingConv::ID CC,
unsigned &NumBytes) {
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CC, false, *FuncInfo.MF, TM, ArgLocs, *Context);
CCInfo.AnalyzeCallOperands(ArgVTs, ArgFlags, CCAssignFnForCall(CC, false));
// Get a count of how many bytes are to be pushed on the stack.
NumBytes = CCInfo.getNextStackOffset();
// Issue CALLSEQ_START
unsigned AdjStackDown = TII.getCallFrameSetupOpcode();
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(AdjStackDown))
.addImm(NumBytes));
// Process the args.
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
unsigned Arg = ArgRegs[VA.getValNo()];
MVT ArgVT = ArgVTs[VA.getValNo()];
// We don't handle NEON/vector parameters yet.
if (ArgVT.isVector() || ArgVT.getSizeInBits() > 64)
return false;
// Handle arg promotion, etc.
switch (VA.getLocInfo()) {
case CCValAssign::Full: break;
case CCValAssign::SExt: {
MVT DestVT = VA.getLocVT();
Arg = ARMEmitIntExt(ArgVT, Arg, DestVT, /*isZExt*/false);
assert (Arg != 0 && "Failed to emit a sext");
ArgVT = DestVT;
break;
}
case CCValAssign::AExt:
// Intentional fall-through. Handle AExt and ZExt.
case CCValAssign::ZExt: {
MVT DestVT = VA.getLocVT();
Arg = ARMEmitIntExt(ArgVT, Arg, DestVT, /*isZExt*/true);
assert (Arg != 0 && "Failed to emit a sext");
ArgVT = DestVT;
break;
}
case CCValAssign::BCvt: {
unsigned BC = FastEmit_r(ArgVT, VA.getLocVT(), ISD::BITCAST, Arg,
/*TODO: Kill=*/false);
assert(BC != 0 && "Failed to emit a bitcast!");
Arg = BC;
ArgVT = VA.getLocVT();
break;
}
default: llvm_unreachable("Unknown arg promotion!");
}
// Now copy/store arg to correct locations.
if (VA.isRegLoc() && !VA.needsCustom()) {
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
VA.getLocReg())
.addReg(Arg);
RegArgs.push_back(VA.getLocReg());
} else if (VA.needsCustom()) {
// TODO: We need custom lowering for vector (v2f64) args.
if (VA.getLocVT() != MVT::f64) return false;
CCValAssign &NextVA = ArgLocs[++i];
// TODO: Only handle register args for now.
if(!(VA.isRegLoc() && NextVA.isRegLoc())) return false;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::VMOVRRD), VA.getLocReg())
.addReg(NextVA.getLocReg(), RegState::Define)
.addReg(Arg));
RegArgs.push_back(VA.getLocReg());
RegArgs.push_back(NextVA.getLocReg());
} else {
assert(VA.isMemLoc());
// Need to store on the stack.
Address Addr;
Addr.BaseType = Address::RegBase;
Addr.Base.Reg = ARM::SP;
Addr.Offset = VA.getLocMemOffset();
if (!ARMEmitStore(ArgVT, Arg, Addr)) return false;
}
}
return true;
}
bool ARMFastISel::FinishCall(MVT RetVT, SmallVectorImpl<unsigned> &UsedRegs,
const Instruction *I, CallingConv::ID CC,
unsigned &NumBytes) {
// Issue CALLSEQ_END
unsigned AdjStackUp = TII.getCallFrameDestroyOpcode();
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(AdjStackUp))
.addImm(NumBytes).addImm(0));
// Now the return value.
if (RetVT != MVT::isVoid) {
SmallVector<CCValAssign, 16> RVLocs;
CCState CCInfo(CC, false, *FuncInfo.MF, TM, RVLocs, *Context);
CCInfo.AnalyzeCallResult(RetVT, CCAssignFnForCall(CC, true));
// Copy all of the result registers out of their specified physreg.
if (RVLocs.size() == 2 && RetVT == MVT::f64) {
// For this move we copy into two registers and then move into the
// double fp reg we want.
EVT DestVT = RVLocs[0].getValVT();
const TargetRegisterClass* DstRC = TLI.getRegClassFor(DestVT);
unsigned ResultReg = createResultReg(DstRC);
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::VMOVDRR), ResultReg)
.addReg(RVLocs[0].getLocReg())
.addReg(RVLocs[1].getLocReg()));
UsedRegs.push_back(RVLocs[0].getLocReg());
UsedRegs.push_back(RVLocs[1].getLocReg());
// Finally update the result.
UpdateValueMap(I, ResultReg);
} else {
assert(RVLocs.size() == 1 &&"Can't handle non-double multi-reg retvals!");
EVT CopyVT = RVLocs[0].getValVT();
// Special handling for extended integers.
if (RetVT == MVT::i1 || RetVT == MVT::i8 || RetVT == MVT::i16)
CopyVT = MVT::i32;
const TargetRegisterClass* DstRC = TLI.getRegClassFor(CopyVT);
unsigned ResultReg = createResultReg(DstRC);
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
ResultReg).addReg(RVLocs[0].getLocReg());
UsedRegs.push_back(RVLocs[0].getLocReg());
// Finally update the result.
UpdateValueMap(I, ResultReg);
}
}
return true;
}
bool ARMFastISel::SelectRet(const Instruction *I) {
const ReturnInst *Ret = cast<ReturnInst>(I);
const Function &F = *I->getParent()->getParent();
if (!FuncInfo.CanLowerReturn)
return false;
if (F.isVarArg())
return false;
CallingConv::ID CC = F.getCallingConv();
if (Ret->getNumOperands() > 0) {
SmallVector<ISD::OutputArg, 4> Outs;
GetReturnInfo(F.getReturnType(), F.getAttributes().getRetAttributes(),
Outs, TLI);
// Analyze operands of the call, assigning locations to each operand.
SmallVector<CCValAssign, 16> ValLocs;
CCState CCInfo(CC, F.isVarArg(), *FuncInfo.MF, TM, ValLocs,I->getContext());
CCInfo.AnalyzeReturn(Outs, CCAssignFnForCall(CC, true /* is Ret */));
const Value *RV = Ret->getOperand(0);
unsigned Reg = getRegForValue(RV);
if (Reg == 0)
return false;
// Only handle a single return value for now.
if (ValLocs.size() != 1)
return false;
CCValAssign &VA = ValLocs[0];
// Don't bother handling odd stuff for now.
if (VA.getLocInfo() != CCValAssign::Full)
return false;
// Only handle register returns for now.
if (!VA.isRegLoc())
return false;
unsigned SrcReg = Reg + VA.getValNo();
EVT RVVT = TLI.getValueType(RV->getType());
EVT DestVT = VA.getValVT();
// Special handling for extended integers.
if (RVVT != DestVT) {
if (RVVT != MVT::i1 && RVVT != MVT::i8 && RVVT != MVT::i16)
return false;
assert(DestVT == MVT::i32 && "ARM should always ext to i32");
// Perform extension if flagged as either zext or sext. Otherwise, do
// nothing.
if (Outs[0].Flags.isZExt() || Outs[0].Flags.isSExt()) {
SrcReg = ARMEmitIntExt(RVVT, SrcReg, DestVT, Outs[0].Flags.isZExt());
if (SrcReg == 0) return false;
}
}
// Make the copy.
unsigned DstReg = VA.getLocReg();
const TargetRegisterClass* SrcRC = MRI.getRegClass(SrcReg);
// Avoid a cross-class copy. This is very unlikely.
if (!SrcRC->contains(DstReg))
return false;
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
DstReg).addReg(SrcReg);
// Mark the register as live out of the function.
MRI.addLiveOut(VA.getLocReg());
}
unsigned RetOpc = isThumb2 ? ARM::tBX_RET : ARM::BX_RET;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(RetOpc)));
return true;
}
unsigned ARMFastISel::ARMSelectCallOp(const GlobalValue *GV) {
// iOS needs the r9 versions of the opcodes.
bool isiOS = Subtarget->isTargetIOS();
if (isThumb2) {
return isiOS ? ARM::tBLr9 : ARM::tBL;
} else {
return isiOS ? ARM::BLr9 : ARM::BL;
}
}
// A quick function that will emit a call for a named libcall in F with the
// vector of passed arguments for the Instruction in I. We can assume that we
// can emit a call for any libcall we can produce. This is an abridged version
// of the full call infrastructure since we won't need to worry about things
// like computed function pointers or strange arguments at call sites.
// TODO: Try to unify this and the normal call bits for ARM, then try to unify
// with X86.
bool ARMFastISel::ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call) {
CallingConv::ID CC = TLI.getLibcallCallingConv(Call);
// Handle *simple* calls for now.
Type *RetTy = I->getType();
MVT RetVT;
if (RetTy->isVoidTy())
RetVT = MVT::isVoid;
else if (!isTypeLegal(RetTy, RetVT))
return false;
// TODO: For now if we have long calls specified we don't handle the call.
if (EnableARMLongCalls) return false;
// Set up the argument vectors.
SmallVector<Value*, 8> Args;
SmallVector<unsigned, 8> ArgRegs;
SmallVector<MVT, 8> ArgVTs;
SmallVector<ISD::ArgFlagsTy, 8> ArgFlags;
Args.reserve(I->getNumOperands());
ArgRegs.reserve(I->getNumOperands());
ArgVTs.reserve(I->getNumOperands());
ArgFlags.reserve(I->getNumOperands());
for (unsigned i = 0; i < I->getNumOperands(); ++i) {
Value *Op = I->getOperand(i);
unsigned Arg = getRegForValue(Op);
if (Arg == 0) return false;
Type *ArgTy = Op->getType();
MVT ArgVT;
if (!isTypeLegal(ArgTy, ArgVT)) return false;
ISD::ArgFlagsTy Flags;
unsigned OriginalAlignment = TD.getABITypeAlignment(ArgTy);
Flags.setOrigAlign(OriginalAlignment);
Args.push_back(Op);
ArgRegs.push_back(Arg);
ArgVTs.push_back(ArgVT);
ArgFlags.push_back(Flags);
}
// Handle the arguments now that we've gotten them.
SmallVector<unsigned, 4> RegArgs;
unsigned NumBytes;
if (!ProcessCallArgs(Args, ArgRegs, ArgVTs, ArgFlags, RegArgs, CC, NumBytes))
return false;
// Issue the call, BLr9 for iOS, BL otherwise.
// TODO: Turn this into the table of arm call ops.
MachineInstrBuilder MIB;
unsigned CallOpc = ARMSelectCallOp(NULL);
if(isThumb2)
// Explicitly adding the predicate here.
MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(CallOpc)))
.addExternalSymbol(TLI.getLibcallName(Call));
else
// Explicitly adding the predicate here.
MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(CallOpc))
.addExternalSymbol(TLI.getLibcallName(Call)));
// Add implicit physical register uses to the call.
for (unsigned i = 0, e = RegArgs.size(); i != e; ++i)
MIB.addReg(RegArgs[i]);
// Add a register mask with the call-preserved registers.
// Proper defs for return values will be added by setPhysRegsDeadExcept().
MIB.addRegMask(TRI.getCallPreservedMask(CC));
// Finish off the call including any return values.
SmallVector<unsigned, 4> UsedRegs;
if (!FinishCall(RetVT, UsedRegs, I, CC, NumBytes)) return false;
// Set all unused physreg defs as dead.
static_cast<MachineInstr *>(MIB)->setPhysRegsDeadExcept(UsedRegs, TRI);
return true;
}
bool ARMFastISel::SelectCall(const Instruction *I,
const char *IntrMemName = 0) {
const CallInst *CI = cast<CallInst>(I);
const Value *Callee = CI->getCalledValue();
// Can't handle inline asm.
if (isa<InlineAsm>(Callee)) return false;
// Only handle global variable Callees.
const GlobalValue *GV = dyn_cast<GlobalValue>(Callee);
if (!GV)
return false;
// Check the calling convention.
ImmutableCallSite CS(CI);
CallingConv::ID CC = CS.getCallingConv();
// TODO: Avoid some calling conventions?
// Let SDISel handle vararg functions.
PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
FunctionType *FTy = cast<FunctionType>(PT->getElementType());
if (FTy->isVarArg())
return false;
// Handle *simple* calls for now.
Type *RetTy = I->getType();
MVT RetVT;
if (RetTy->isVoidTy())
RetVT = MVT::isVoid;
else if (!isTypeLegal(RetTy, RetVT) && RetVT != MVT::i16 &&
RetVT != MVT::i8 && RetVT != MVT::i1)
return false;
// TODO: For now if we have long calls specified we don't handle the call.
if (EnableARMLongCalls) return false;
// Set up the argument vectors.
SmallVector<Value*, 8> Args;
SmallVector<unsigned, 8> ArgRegs;
SmallVector<MVT, 8> ArgVTs;
SmallVector<ISD::ArgFlagsTy, 8> ArgFlags;
unsigned arg_size = CS.arg_size();
Args.reserve(arg_size);
ArgRegs.reserve(arg_size);
ArgVTs.reserve(arg_size);
ArgFlags.reserve(arg_size);
for (ImmutableCallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
i != e; ++i) {
// If we're lowering a memory intrinsic instead of a regular call, skip the
// last two arguments, which shouldn't be passed to the underlying function.
if (IntrMemName && e-i <= 2)
break;
ISD::ArgFlagsTy Flags;
unsigned AttrInd = i - CS.arg_begin() + 1;
if (CS.paramHasAttr(AttrInd, Attribute::SExt))
Flags.setSExt();
if (CS.paramHasAttr(AttrInd, Attribute::ZExt))
Flags.setZExt();
// FIXME: Only handle *easy* calls for now.
if (CS.paramHasAttr(AttrInd, Attribute::InReg) ||
CS.paramHasAttr(AttrInd, Attribute::StructRet) ||
CS.paramHasAttr(AttrInd, Attribute::Nest) ||
CS.paramHasAttr(AttrInd, Attribute::ByVal))
return false;
Type *ArgTy = (*i)->getType();
MVT ArgVT;
if (!isTypeLegal(ArgTy, ArgVT) && ArgVT != MVT::i16 && ArgVT != MVT::i8 &&
ArgVT != MVT::i1)
return false;
unsigned Arg = getRegForValue(*i);
if (Arg == 0)
return false;
unsigned OriginalAlignment = TD.getABITypeAlignment(ArgTy);
Flags.setOrigAlign(OriginalAlignment);
Args.push_back(*i);
ArgRegs.push_back(Arg);
ArgVTs.push_back(ArgVT);
ArgFlags.push_back(Flags);
}
// Handle the arguments now that we've gotten them.
SmallVector<unsigned, 4> RegArgs;
unsigned NumBytes;
if (!ProcessCallArgs(Args, ArgRegs, ArgVTs, ArgFlags, RegArgs, CC, NumBytes))
return false;
// Issue the call, BLr9 for iOS, BL otherwise.
// TODO: Turn this into the table of arm call ops.
MachineInstrBuilder MIB;
unsigned CallOpc = ARMSelectCallOp(GV);
// Explicitly adding the predicate here.
if(isThumb2) {
// Explicitly adding the predicate here.
MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(CallOpc)));
if (!IntrMemName)
MIB.addGlobalAddress(GV, 0, 0);
else
MIB.addExternalSymbol(IntrMemName, 0);
} else {
if (!IntrMemName)
// Explicitly adding the predicate here.
MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(CallOpc))
.addGlobalAddress(GV, 0, 0));
else
MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(CallOpc))
.addExternalSymbol(IntrMemName, 0));
}
// Add implicit physical register uses to the call.
for (unsigned i = 0, e = RegArgs.size(); i != e; ++i)
MIB.addReg(RegArgs[i]);
// Add a register mask with the call-preserved registers.
// Proper defs for return values will be added by setPhysRegsDeadExcept().
MIB.addRegMask(TRI.getCallPreservedMask(CC));
// Finish off the call including any return values.
SmallVector<unsigned, 4> UsedRegs;
if (!FinishCall(RetVT, UsedRegs, I, CC, NumBytes)) return false;
// Set all unused physreg defs as dead.
static_cast<MachineInstr *>(MIB)->setPhysRegsDeadExcept(UsedRegs, TRI);
return true;
}
bool ARMFastISel::ARMIsMemCpySmall(uint64_t Len) {
return Len <= 16;
}
bool ARMFastISel::ARMTryEmitSmallMemCpy(Address Dest, Address Src, uint64_t Len) {
// Make sure we don't bloat code by inlining very large memcpy's.
if (!ARMIsMemCpySmall(Len))
return false;
// We don't care about alignment here since we just emit integer accesses.
while (Len) {
MVT VT;
if (Len >= 4)
VT = MVT::i32;
else if (Len >= 2)
VT = MVT::i16;
else {
assert(Len == 1);
VT = MVT::i8;
}
bool RV;
unsigned ResultReg;
RV = ARMEmitLoad(VT, ResultReg, Src);
assert (RV == true && "Should be able to handle this load.");
RV = ARMEmitStore(VT, ResultReg, Dest);
assert (RV == true && "Should be able to handle this store.");
(void)RV;
unsigned Size = VT.getSizeInBits()/8;
Len -= Size;
Dest.Offset += Size;
Src.Offset += Size;
}
return true;
}
bool ARMFastISel::SelectIntrinsicCall(const IntrinsicInst &I) {
// FIXME: Handle more intrinsics.
switch (I.getIntrinsicID()) {
default: return false;
case Intrinsic::memcpy:
case Intrinsic::memmove: {
const MemTransferInst &MTI = cast<MemTransferInst>(I);
// Don't handle volatile.
if (MTI.isVolatile())
return false;
// Disable inlining for memmove before calls to ComputeAddress. Otherwise,
// we would emit dead code because we don't currently handle memmoves.
bool isMemCpy = (I.getIntrinsicID() == Intrinsic::memcpy);
if (isa<ConstantInt>(MTI.getLength()) && isMemCpy) {
// Small memcpy's are common enough that we want to do them without a call
// if possible.
uint64_t Len = cast<ConstantInt>(MTI.getLength())->getZExtValue();
if (ARMIsMemCpySmall(Len)) {
Address Dest, Src;
if (!ARMComputeAddress(MTI.getRawDest(), Dest) ||
!ARMComputeAddress(MTI.getRawSource(), Src))
return false;
if (ARMTryEmitSmallMemCpy(Dest, Src, Len))
return true;
}
}
if (!MTI.getLength()->getType()->isIntegerTy(32))
return false;
if (MTI.getSourceAddressSpace() > 255 || MTI.getDestAddressSpace() > 255)
return false;
const char *IntrMemName = isa<MemCpyInst>(I) ? "memcpy" : "memmove";
return SelectCall(&I, IntrMemName);
}
case Intrinsic::memset: {
const MemSetInst &MSI = cast<MemSetInst>(I);
// Don't handle volatile.
if (MSI.isVolatile())
return false;
if (!MSI.getLength()->getType()->isIntegerTy(32))
return false;
if (MSI.getDestAddressSpace() > 255)
return false;
return SelectCall(&I, "memset");
}
}
}
bool ARMFastISel::SelectTrunc(const Instruction *I) {
// The high bits for a type smaller than the register size are assumed to be
// undefined.
Value *Op = I->getOperand(0);
EVT SrcVT, DestVT;
SrcVT = TLI.getValueType(Op->getType(), true);
DestVT = TLI.getValueType(I->getType(), true);
if (SrcVT != MVT::i32 && SrcVT != MVT::i16 && SrcVT != MVT::i8)
return false;
if (DestVT != MVT::i16 && DestVT != MVT::i8 && DestVT != MVT::i1)
return false;
unsigned SrcReg = getRegForValue(Op);
if (!SrcReg) return false;
// Because the high bits are undefined, a truncate doesn't generate
// any code.
UpdateValueMap(I, SrcReg);
return true;
}
unsigned ARMFastISel::ARMEmitIntExt(EVT SrcVT, unsigned SrcReg, EVT DestVT,
bool isZExt) {
if (DestVT != MVT::i32 && DestVT != MVT::i16 && DestVT != MVT::i8)
return 0;
unsigned Opc;
bool isBoolZext = false;
if (!SrcVT.isSimple()) return 0;
switch (SrcVT.getSimpleVT().SimpleTy) {
default: return 0;
case MVT::i16:
if (!Subtarget->hasV6Ops()) return 0;
if (isZExt)
Opc = isThumb2 ? ARM::t2UXTH : ARM::UXTH;
else
Opc = isThumb2 ? ARM::t2SXTH : ARM::SXTH;
break;
case MVT::i8:
if (!Subtarget->hasV6Ops()) return 0;
if (isZExt)
Opc = isThumb2 ? ARM::t2UXTB : ARM::UXTB;
else
Opc = isThumb2 ? ARM::t2SXTB : ARM::SXTB;
break;
case MVT::i1:
if (isZExt) {
Opc = isThumb2 ? ARM::t2ANDri : ARM::ANDri;
isBoolZext = true;
break;
}
return 0;
}
unsigned ResultReg = createResultReg(TLI.getRegClassFor(MVT::i32));
MachineInstrBuilder MIB;
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc), ResultReg)
.addReg(SrcReg);
if (isBoolZext)
MIB.addImm(1);
else
MIB.addImm(0);
AddOptionalDefs(MIB);
return ResultReg;
}
bool ARMFastISel::SelectIntExt(const Instruction *I) {
// On ARM, in general, integer casts don't involve legal types; this code
// handles promotable integers.
Type *DestTy = I->getType();
Value *Src = I->getOperand(0);
Type *SrcTy = Src->getType();
EVT SrcVT, DestVT;
SrcVT = TLI.getValueType(SrcTy, true);
DestVT = TLI.getValueType(DestTy, true);
bool isZExt = isa<ZExtInst>(I);
unsigned SrcReg = getRegForValue(Src);
if (!SrcReg) return false;
unsigned ResultReg = ARMEmitIntExt(SrcVT, SrcReg, DestVT, isZExt);
if (ResultReg == 0) return false;
UpdateValueMap(I, ResultReg);
return true;
}
// TODO: SoftFP support.
bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
switch (I->getOpcode()) {
case Instruction::Load:
return SelectLoad(I);
case Instruction::Store:
return SelectStore(I);
case Instruction::Br:
return SelectBranch(I);
case Instruction::IndirectBr:
return SelectIndirectBr(I);
case Instruction::ICmp:
case Instruction::FCmp:
return SelectCmp(I);
case Instruction::FPExt:
return SelectFPExt(I);
case Instruction::FPTrunc:
return SelectFPTrunc(I);
case Instruction::SIToFP:
return SelectIToFP(I, /*isSigned*/ true);
case Instruction::UIToFP:
return SelectIToFP(I, /*isSigned*/ false);
case Instruction::FPToSI:
return SelectFPToI(I, /*isSigned*/ true);
case Instruction::FPToUI:
return SelectFPToI(I, /*isSigned*/ false);
case Instruction::Add:
return SelectBinaryIntOp(I, ISD::ADD);
case Instruction::Or:
return SelectBinaryIntOp(I, ISD::OR);
case Instruction::Sub:
return SelectBinaryIntOp(I, ISD::SUB);
case Instruction::FAdd:
return SelectBinaryFPOp(I, ISD::FADD);
case Instruction::FSub:
return SelectBinaryFPOp(I, ISD::FSUB);
case Instruction::FMul:
return SelectBinaryFPOp(I, ISD::FMUL);
case Instruction::SDiv:
return SelectDiv(I, /*isSigned*/ true);
case Instruction::UDiv:
return SelectDiv(I, /*isSigned*/ false);
case Instruction::SRem:
return SelectRem(I, /*isSigned*/ true);
case Instruction::URem:
return SelectRem(I, /*isSigned*/ false);
case Instruction::Call:
if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(I))
return SelectIntrinsicCall(*II);
return SelectCall(I);
case Instruction::Select:
return SelectSelect(I);
case Instruction::Ret:
return SelectRet(I);
case Instruction::Trunc:
return SelectTrunc(I);
case Instruction::ZExt:
case Instruction::SExt:
return SelectIntExt(I);
default: break;
}
return false;
}
/// TryToFoldLoad - The specified machine instr operand is a vreg, and that
/// vreg is being provided by the specified load instruction. If possible,
/// try to fold the load as an operand to the instruction, returning true if
/// successful.
bool ARMFastISel::TryToFoldLoad(MachineInstr *MI, unsigned OpNo,
const LoadInst *LI) {
// Verify we have a legal type before going any further.
MVT VT;
if (!isLoadTypeLegal(LI->getType(), VT))
return false;
// Combine load followed by zero- or sign-extend.
// ldrb r1, [r0] ldrb r1, [r0]
// uxtb r2, r1 =>
// mov r3, r2 mov r3, r1
bool isZExt = true;
switch(MI->getOpcode()) {
default: return false;
case ARM::SXTH:
case ARM::t2SXTH:
isZExt = false;
case ARM::UXTH:
case ARM::t2UXTH:
if (VT != MVT::i16)
return false;
break;
case ARM::SXTB:
case ARM::t2SXTB:
isZExt = false;
case ARM::UXTB:
case ARM::t2UXTB:
if (VT != MVT::i8)
return false;
break;
}
// See if we can handle this address.
Address Addr;
if (!ARMComputeAddress(LI->getOperand(0), Addr)) return false;
unsigned ResultReg = MI->getOperand(0).getReg();
if (!ARMEmitLoad(VT, ResultReg, Addr, LI->getAlignment(), isZExt, false))
return false;
MI->eraseFromParent();
return true;
}
namespace llvm {
llvm::FastISel *ARM::createFastISel(FunctionLoweringInfo &funcInfo) {
// Completely untested on non-iOS.
const TargetMachine &TM = funcInfo.MF->getTarget();
// Darwin and thumb1 only for now.
const ARMSubtarget *Subtarget = &TM.getSubtarget<ARMSubtarget>();
if (Subtarget->isTargetIOS() && !Subtarget->isThumb1Only() &&
!DisableARMFastISel)
return new ARMFastISel(funcInfo);
return 0;
}
}
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