mirror of
https://github.com/c64scene-ar/llvm-6502.git
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955ed73d12
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123707 91177308-0d34-0410-b5e6-96231b3b80d8
1902 lines
65 KiB
C++
1902 lines
65 KiB
C++
//===-- ARMFastISel.cpp - ARM FastISel implementation ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// 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 the ARM-specific support for the FastISel class. Some
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// of the target-specific code is generated by tablegen in the file
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// ARMGenFastISel.inc, which is #included here.
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//
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//===----------------------------------------------------------------------===//
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#include "ARM.h"
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#include "ARMBaseInstrInfo.h"
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#include "ARMCallingConv.h"
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#include "ARMRegisterInfo.h"
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#include "ARMTargetMachine.h"
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#include "ARMSubtarget.h"
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#include "ARMConstantPoolValue.h"
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#include "llvm/CallingConv.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Instructions.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/Analysis.h"
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#include "llvm/CodeGen/FastISel.h"
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#include "llvm/CodeGen/FunctionLoweringInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineMemOperand.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/PseudoSourceValue.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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using namespace llvm;
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static cl::opt<bool>
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DisableARMFastISel("disable-arm-fast-isel",
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cl::desc("Turn off experimental ARM fast-isel support"),
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cl::init(false), cl::Hidden);
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extern cl::opt<bool> EnableARMLongCalls;
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namespace {
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// All possible address modes, plus some.
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typedef struct Address {
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enum {
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RegBase,
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FrameIndexBase
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} BaseType;
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union {
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unsigned Reg;
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int FI;
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} Base;
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int Offset;
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unsigned Scale;
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unsigned PlusReg;
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// Innocuous defaults for our address.
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Address()
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: BaseType(RegBase), Offset(0), Scale(0), PlusReg(0) {
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Base.Reg = 0;
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}
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} Address;
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class ARMFastISel : public FastISel {
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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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const TargetMachine &TM;
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const TargetInstrInfo &TII;
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const TargetLowering &TLI;
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ARMFunctionInfo *AFI;
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// Convenience variables to avoid some queries.
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bool isThumb;
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LLVMContext *Context;
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public:
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explicit ARMFastISel(FunctionLoweringInfo &funcInfo)
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: FastISel(funcInfo),
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TM(funcInfo.MF->getTarget()),
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TII(*TM.getInstrInfo()),
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TLI(*TM.getTargetLowering()) {
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Subtarget = &TM.getSubtarget<ARMSubtarget>();
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AFI = funcInfo.MF->getInfo<ARMFunctionInfo>();
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isThumb = AFI->isThumbFunction();
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Context = &funcInfo.Fn->getContext();
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}
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// Code from FastISel.cpp.
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virtual unsigned FastEmitInst_(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC);
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virtual unsigned FastEmitInst_r(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill);
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virtual unsigned FastEmitInst_rr(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill,
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unsigned Op1, bool Op1IsKill);
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virtual unsigned FastEmitInst_ri(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill,
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uint64_t Imm);
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virtual unsigned FastEmitInst_rf(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill,
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const ConstantFP *FPImm);
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virtual unsigned FastEmitInst_i(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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uint64_t Imm);
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virtual unsigned FastEmitInst_rri(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill,
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unsigned Op1, bool Op1IsKill,
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uint64_t Imm);
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virtual unsigned FastEmitInst_extractsubreg(MVT RetVT,
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unsigned Op0, bool Op0IsKill,
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uint32_t Idx);
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// Backend specific FastISel code.
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virtual bool TargetSelectInstruction(const Instruction *I);
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virtual unsigned TargetMaterializeConstant(const Constant *C);
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virtual unsigned TargetMaterializeAlloca(const AllocaInst *AI);
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#include "ARMGenFastISel.inc"
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// Instruction selection routines.
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private:
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bool SelectLoad(const Instruction *I);
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bool SelectStore(const Instruction *I);
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bool SelectBranch(const Instruction *I);
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bool SelectCmp(const Instruction *I);
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bool SelectFPExt(const Instruction *I);
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bool SelectFPTrunc(const Instruction *I);
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bool SelectBinaryOp(const Instruction *I, unsigned ISDOpcode);
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bool SelectSIToFP(const Instruction *I);
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bool SelectFPToSI(const Instruction *I);
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bool SelectSDiv(const Instruction *I);
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bool SelectSRem(const Instruction *I);
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bool SelectCall(const Instruction *I);
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bool SelectSelect(const Instruction *I);
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bool SelectRet(const Instruction *I);
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// Utility routines.
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private:
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bool isTypeLegal(const Type *Ty, MVT &VT);
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bool isLoadTypeLegal(const Type *Ty, MVT &VT);
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bool ARMEmitLoad(EVT VT, unsigned &ResultReg, Address &Addr);
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bool ARMEmitStore(EVT VT, unsigned SrcReg, Address &Addr);
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bool ARMComputeAddress(const Value *Obj, Address &Addr);
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void ARMSimplifyAddress(Address &Addr, EVT VT);
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unsigned ARMMaterializeFP(const ConstantFP *CFP, EVT VT);
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unsigned ARMMaterializeInt(const Constant *C, EVT VT);
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unsigned ARMMaterializeGV(const GlobalValue *GV, EVT VT);
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unsigned ARMMoveToFPReg(EVT VT, unsigned SrcReg);
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unsigned ARMMoveToIntReg(EVT VT, unsigned SrcReg);
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// Call handling routines.
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private:
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bool FastEmitExtend(ISD::NodeType Opc, EVT DstVT, unsigned Src, EVT SrcVT,
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unsigned &ResultReg);
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CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool Return);
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bool ProcessCallArgs(SmallVectorImpl<Value*> &Args,
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SmallVectorImpl<unsigned> &ArgRegs,
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SmallVectorImpl<MVT> &ArgVTs,
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SmallVectorImpl<ISD::ArgFlagsTy> &ArgFlags,
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SmallVectorImpl<unsigned> &RegArgs,
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CallingConv::ID CC,
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unsigned &NumBytes);
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bool FinishCall(MVT RetVT, SmallVectorImpl<unsigned> &UsedRegs,
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const Instruction *I, CallingConv::ID CC,
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unsigned &NumBytes);
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bool ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call);
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// OptionalDef handling routines.
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private:
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bool DefinesOptionalPredicate(MachineInstr *MI, bool *CPSR);
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const MachineInstrBuilder &AddOptionalDefs(const MachineInstrBuilder &MIB);
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void AddLoadStoreOperands(EVT VT, Address &Addr,
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const MachineInstrBuilder &MIB);
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};
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} // end anonymous namespace
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#include "ARMGenCallingConv.inc"
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// DefinesOptionalPredicate - This is different from DefinesPredicate in that
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// we don't care about implicit defs here, just places we'll need to add a
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// default CCReg argument. Sets CPSR if we're setting CPSR instead of CCR.
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bool ARMFastISel::DefinesOptionalPredicate(MachineInstr *MI, bool *CPSR) {
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const TargetInstrDesc &TID = MI->getDesc();
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if (!TID.hasOptionalDef())
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return false;
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// Look to see if our OptionalDef is defining CPSR or CCR.
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = MI->getOperand(i);
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if (!MO.isReg() || !MO.isDef()) continue;
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if (MO.getReg() == ARM::CPSR)
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*CPSR = true;
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}
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return true;
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}
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// If the machine is predicable go ahead and add the predicate operands, if
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// it needs default CC operands add those.
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// TODO: If we want to support thumb1 then we'll need to deal with optional
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// CPSR defs that need to be added before the remaining operands. See s_cc_out
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// for descriptions why.
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const MachineInstrBuilder &
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ARMFastISel::AddOptionalDefs(const MachineInstrBuilder &MIB) {
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MachineInstr *MI = &*MIB;
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// Do we use a predicate?
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if (TII.isPredicable(MI))
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AddDefaultPred(MIB);
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// Do we optionally set a predicate? Preds is size > 0 iff the predicate
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// defines CPSR. All other OptionalDefines in ARM are the CCR register.
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bool CPSR = false;
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if (DefinesOptionalPredicate(MI, &CPSR)) {
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if (CPSR)
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AddDefaultT1CC(MIB);
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else
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AddDefaultCC(MIB);
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}
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return MIB;
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}
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unsigned ARMFastISel::FastEmitInst_(unsigned MachineInstOpcode,
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const TargetRegisterClass* RC) {
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unsigned ResultReg = createResultReg(RC);
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const TargetInstrDesc &II = TII.get(MachineInstOpcode);
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg));
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return ResultReg;
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}
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unsigned ARMFastISel::FastEmitInst_r(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill) {
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unsigned ResultReg = createResultReg(RC);
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const TargetInstrDesc &II = TII.get(MachineInstOpcode);
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if (II.getNumDefs() >= 1)
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
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.addReg(Op0, Op0IsKill * RegState::Kill));
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else {
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
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.addReg(Op0, Op0IsKill * RegState::Kill));
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
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TII.get(TargetOpcode::COPY), ResultReg)
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.addReg(II.ImplicitDefs[0]));
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}
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return ResultReg;
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}
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unsigned ARMFastISel::FastEmitInst_rr(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill,
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unsigned Op1, bool Op1IsKill) {
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unsigned ResultReg = createResultReg(RC);
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const TargetInstrDesc &II = TII.get(MachineInstOpcode);
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if (II.getNumDefs() >= 1)
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
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.addReg(Op0, Op0IsKill * RegState::Kill)
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.addReg(Op1, Op1IsKill * RegState::Kill));
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else {
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
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.addReg(Op0, Op0IsKill * RegState::Kill)
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.addReg(Op1, Op1IsKill * RegState::Kill));
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
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TII.get(TargetOpcode::COPY), ResultReg)
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.addReg(II.ImplicitDefs[0]));
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}
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return ResultReg;
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}
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unsigned ARMFastISel::FastEmitInst_ri(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill,
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uint64_t Imm) {
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unsigned ResultReg = createResultReg(RC);
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const TargetInstrDesc &II = TII.get(MachineInstOpcode);
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if (II.getNumDefs() >= 1)
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
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.addReg(Op0, Op0IsKill * RegState::Kill)
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.addImm(Imm));
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else {
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
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.addReg(Op0, Op0IsKill * RegState::Kill)
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.addImm(Imm));
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
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TII.get(TargetOpcode::COPY), ResultReg)
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.addReg(II.ImplicitDefs[0]));
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}
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return ResultReg;
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}
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unsigned ARMFastISel::FastEmitInst_rf(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill,
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const ConstantFP *FPImm) {
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unsigned ResultReg = createResultReg(RC);
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const TargetInstrDesc &II = TII.get(MachineInstOpcode);
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if (II.getNumDefs() >= 1)
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
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.addReg(Op0, Op0IsKill * RegState::Kill)
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.addFPImm(FPImm));
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else {
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
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.addReg(Op0, Op0IsKill * RegState::Kill)
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.addFPImm(FPImm));
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
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TII.get(TargetOpcode::COPY), ResultReg)
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.addReg(II.ImplicitDefs[0]));
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}
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return ResultReg;
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}
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unsigned ARMFastISel::FastEmitInst_rri(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill,
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unsigned Op1, bool Op1IsKill,
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uint64_t Imm) {
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unsigned ResultReg = createResultReg(RC);
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const TargetInstrDesc &II = TII.get(MachineInstOpcode);
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if (II.getNumDefs() >= 1)
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
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.addReg(Op0, Op0IsKill * RegState::Kill)
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.addReg(Op1, Op1IsKill * RegState::Kill)
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.addImm(Imm));
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else {
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
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.addReg(Op0, Op0IsKill * RegState::Kill)
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.addReg(Op1, Op1IsKill * RegState::Kill)
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.addImm(Imm));
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
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TII.get(TargetOpcode::COPY), ResultReg)
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.addReg(II.ImplicitDefs[0]));
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}
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return ResultReg;
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}
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unsigned ARMFastISel::FastEmitInst_i(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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uint64_t Imm) {
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unsigned ResultReg = createResultReg(RC);
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const TargetInstrDesc &II = TII.get(MachineInstOpcode);
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if (II.getNumDefs() >= 1)
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
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.addImm(Imm));
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else {
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
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.addImm(Imm));
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
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TII.get(TargetOpcode::COPY), ResultReg)
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.addReg(II.ImplicitDefs[0]));
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}
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return ResultReg;
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}
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unsigned ARMFastISel::FastEmitInst_extractsubreg(MVT RetVT,
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unsigned Op0, bool Op0IsKill,
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uint32_t Idx) {
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unsigned ResultReg = createResultReg(TLI.getRegClassFor(RetVT));
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assert(TargetRegisterInfo::isVirtualRegister(Op0) &&
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"Cannot yet extract from physregs");
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
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DL, TII.get(TargetOpcode::COPY), ResultReg)
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.addReg(Op0, getKillRegState(Op0IsKill), Idx));
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return ResultReg;
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}
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// TODO: Don't worry about 64-bit now, but when this is fixed remove the
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// checks from the various callers.
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unsigned ARMFastISel::ARMMoveToFPReg(EVT VT, unsigned SrcReg) {
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if (VT == MVT::f64) return 0;
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unsigned MoveReg = createResultReg(TLI.getRegClassFor(VT));
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
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TII.get(ARM::VMOVRS), MoveReg)
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.addReg(SrcReg));
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return MoveReg;
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}
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unsigned ARMFastISel::ARMMoveToIntReg(EVT VT, unsigned SrcReg) {
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if (VT == MVT::i64) return 0;
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unsigned MoveReg = createResultReg(TLI.getRegClassFor(VT));
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
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TII.get(ARM::VMOVSR), MoveReg)
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.addReg(SrcReg));
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return MoveReg;
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}
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// For double width floating point we need to materialize two constants
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// (the high and the low) into integer registers then use a move to get
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// the combined constant into an FP reg.
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unsigned ARMFastISel::ARMMaterializeFP(const ConstantFP *CFP, EVT VT) {
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const APFloat Val = CFP->getValueAPF();
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bool is64bit = VT == MVT::f64;
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// This checks to see if we can use VFP3 instructions to materialize
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// a constant, otherwise we have to go through the constant pool.
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if (TLI.isFPImmLegal(Val, VT)) {
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unsigned Opc = is64bit ? ARM::FCONSTD : ARM::FCONSTS;
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unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
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AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
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DestReg)
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.addFPImm(CFP));
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return DestReg;
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}
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// Require VFP2 for loading fp constants.
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if (!Subtarget->hasVFP2()) return false;
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// MachineConstantPool wants an explicit alignment.
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unsigned Align = TD.getPrefTypeAlignment(CFP->getType());
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if (Align == 0) {
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// TODO: Figure out if this is correct.
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Align = TD.getTypeAllocSize(CFP->getType());
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}
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unsigned Idx = MCP.getConstantPoolIndex(cast<Constant>(CFP), Align);
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unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
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unsigned Opc = is64bit ? ARM::VLDRD : ARM::VLDRS;
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// 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) {
|
|
|
|
// For now 32-bit only.
|
|
if (VT != MVT::i32) return false;
|
|
|
|
unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
|
|
|
|
// 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->getSExtValue())) {
|
|
unsigned Opc = isThumb ? ARM::t2MOVi16 : ARM::MOVi16;
|
|
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(Opc), DestReg)
|
|
.addImm(CI->getSExtValue()));
|
|
return DestReg;
|
|
}
|
|
|
|
// 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 (isThumb)
|
|
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: No external globals for now.
|
|
if (Subtarget->GVIsIndirectSymbol(GV, RelocM)) return 0;
|
|
|
|
// TODO: Need more magic for ARM PIC.
|
|
if (!isThumb && (RelocM == Reloc::PIC_)) return 0;
|
|
|
|
// 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 = new ARMConstantPoolValue(GV, Id,
|
|
ARMCP::CPValue, PCAdj);
|
|
unsigned Idx = MCP.getConstantPoolIndex(CPV, Align);
|
|
|
|
// Load value.
|
|
MachineInstrBuilder MIB;
|
|
unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
|
|
if (isThumb) {
|
|
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);
|
|
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;
|
|
}
|
|
|
|
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()) {
|
|
TargetRegisterClass* RC = TLI.getRegClassFor(VT);
|
|
unsigned ResultReg = createResultReg(RC);
|
|
unsigned Opc = isThumb ? 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(const 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(const 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::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 (const 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 (const 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());
|
|
SmallVector<const Value *, 4> Worklist;
|
|
Worklist.push_back(Op);
|
|
do {
|
|
Op = Worklist.pop_back_val();
|
|
if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
|
|
// Constant-offset addressing.
|
|
TmpOffset += CI->getSExtValue() * S;
|
|
} else if (isa<AddOperator>(Op) &&
|
|
isa<ConstantInt>(cast<AddOperator>(Op)->getOperand(1))) {
|
|
// An add with a constant operand. Fold the constant.
|
|
ConstantInt *CI =
|
|
cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
|
|
TmpOffset += CI->getSExtValue() * S;
|
|
// Add the other operand back to the work list.
|
|
Worklist.push_back(cast<AddOperator>(Op)->getOperand(0));
|
|
} else
|
|
goto unsupported_gep;
|
|
} while (!Worklist.empty());
|
|
}
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
}
|
|
|
|
// Materialize the global variable's address into a reg which can
|
|
// then be used later to load the variable.
|
|
if (const GlobalValue *GV = dyn_cast<GlobalValue>(Obj)) {
|
|
unsigned Tmp = ARMMaterializeGV(GV, TLI.getValueType(Obj->getType()));
|
|
if (Tmp == 0) return false;
|
|
|
|
Addr.Base.Reg = Tmp;
|
|
return true;
|
|
}
|
|
|
|
// 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) {
|
|
|
|
assert(VT.isSimple() && "Non-simple types are invalid here!");
|
|
|
|
bool needsLowering = false;
|
|
switch (VT.getSimpleVT().SimpleTy) {
|
|
default:
|
|
assert(false && "Unhandled load/store type!");
|
|
case MVT::i1:
|
|
case MVT::i8:
|
|
case MVT::i16:
|
|
case MVT::i32:
|
|
// Integer loads/stores handle 12-bit offsets.
|
|
needsLowering = ((Addr.Offset & 0xfff) != Addr.Offset);
|
|
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) {
|
|
TargetRegisterClass *RC = isThumb ? ARM::tGPRRegisterClass :
|
|
ARM::GPRRegisterClass;
|
|
unsigned ResultReg = createResultReg(RC);
|
|
unsigned Opc = isThumb ? 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) {
|
|
ARMCC::CondCodes Pred = ARMCC::AL;
|
|
unsigned PredReg = 0;
|
|
|
|
TargetRegisterClass *RC = isThumb ? ARM::tGPRRegisterClass :
|
|
ARM::GPRRegisterClass;
|
|
unsigned BaseReg = createResultReg(RC);
|
|
|
|
if (!isThumb)
|
|
emitARMRegPlusImmediate(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
BaseReg, Addr.Base.Reg, Addr.Offset,
|
|
Pred, PredReg,
|
|
static_cast<const ARMBaseInstrInfo&>(TII));
|
|
else {
|
|
assert(AFI->isThumb2Function());
|
|
emitT2RegPlusImmediate(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
BaseReg, Addr.Base.Reg, Addr.Offset, Pred, PredReg,
|
|
static_cast<const ARMBaseInstrInfo&>(TII));
|
|
}
|
|
Addr.Offset = 0;
|
|
Addr.Base.Reg = BaseReg;
|
|
}
|
|
}
|
|
|
|
void ARMFastISel::AddLoadStoreOperands(EVT VT, Address &Addr,
|
|
const MachineInstrBuilder &MIB) {
|
|
// 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),
|
|
MachineMemOperand::MOLoad,
|
|
MFI.getObjectSize(FI),
|
|
MFI.getObjectAlignment(FI));
|
|
// Now add the rest of the operands.
|
|
MIB.addFrameIndex(FI);
|
|
|
|
// ARM halfword load/stores need an additional operand.
|
|
if (!isThumb && VT.getSimpleVT().SimpleTy == MVT::i16) MIB.addReg(0);
|
|
|
|
MIB.addImm(Addr.Offset);
|
|
MIB.addMemOperand(MMO);
|
|
} else {
|
|
// Now add the rest of the operands.
|
|
MIB.addReg(Addr.Base.Reg);
|
|
|
|
// ARM halfword load/stores need an additional operand.
|
|
if (!isThumb && VT.getSimpleVT().SimpleTy == MVT::i16) MIB.addReg(0);
|
|
|
|
MIB.addImm(Addr.Offset);
|
|
}
|
|
AddOptionalDefs(MIB);
|
|
}
|
|
|
|
bool ARMFastISel::ARMEmitLoad(EVT VT, unsigned &ResultReg, Address &Addr) {
|
|
|
|
assert(VT.isSimple() && "Non-simple types are invalid here!");
|
|
unsigned Opc;
|
|
TargetRegisterClass *RC;
|
|
switch (VT.getSimpleVT().SimpleTy) {
|
|
// This is mostly going to be Neon/vector support.
|
|
default: return false;
|
|
case MVT::i16:
|
|
Opc = isThumb ? ARM::t2LDRHi12 : ARM::LDRH;
|
|
RC = ARM::GPRRegisterClass;
|
|
break;
|
|
case MVT::i8:
|
|
Opc = isThumb ? ARM::t2LDRBi12 : ARM::LDRBi12;
|
|
RC = ARM::GPRRegisterClass;
|
|
break;
|
|
case MVT::i32:
|
|
Opc = isThumb ? ARM::t2LDRi12 : ARM::LDRi12;
|
|
RC = ARM::GPRRegisterClass;
|
|
break;
|
|
case MVT::f32:
|
|
Opc = ARM::VLDRS;
|
|
RC = TLI.getRegClassFor(VT);
|
|
break;
|
|
case MVT::f64:
|
|
Opc = ARM::VLDRD;
|
|
RC = TLI.getRegClassFor(VT);
|
|
break;
|
|
}
|
|
// Simplify this down to something we can handle.
|
|
ARMSimplifyAddress(Addr, VT);
|
|
|
|
// Create the base instruction, then add the operands.
|
|
ResultReg = createResultReg(RC);
|
|
MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(Opc), ResultReg);
|
|
AddLoadStoreOperands(VT, Addr, MIB);
|
|
return true;
|
|
}
|
|
|
|
bool ARMFastISel::SelectLoad(const Instruction *I) {
|
|
// 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)) return false;
|
|
UpdateValueMap(I, ResultReg);
|
|
return true;
|
|
}
|
|
|
|
bool ARMFastISel::ARMEmitStore(EVT VT, unsigned SrcReg, Address &Addr) {
|
|
unsigned StrOpc;
|
|
switch (VT.getSimpleVT().SimpleTy) {
|
|
// This is mostly going to be Neon/vector support.
|
|
default: return false;
|
|
case MVT::i1: {
|
|
unsigned Res = createResultReg(isThumb ? ARM::tGPRRegisterClass :
|
|
ARM::GPRRegisterClass);
|
|
unsigned Opc = isThumb ? 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:
|
|
StrOpc = isThumb ? ARM::t2STRBi12 : ARM::STRBi12;
|
|
break;
|
|
case MVT::i16:
|
|
StrOpc = isThumb ? ARM::t2STRHi12 : ARM::STRH;
|
|
break;
|
|
case MVT::i32:
|
|
StrOpc = isThumb ? ARM::t2STRi12 : ARM::STRi12;
|
|
break;
|
|
case MVT::f32:
|
|
if (!Subtarget->hasVFP2()) return false;
|
|
StrOpc = ARM::VSTRS;
|
|
break;
|
|
case MVT::f64:
|
|
if (!Subtarget->hasVFP2()) return false;
|
|
StrOpc = ARM::VSTRD;
|
|
break;
|
|
}
|
|
// Simplify this down to something we can handle.
|
|
ARMSimplifyAddress(Addr, VT);
|
|
|
|
// Create the base instruction, then add the operands.
|
|
MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(StrOpc))
|
|
.addReg(SrcReg, getKillRegState(true));
|
|
AddLoadStoreOperands(VT, Addr, MIB);
|
|
return true;
|
|
}
|
|
|
|
bool ARMFastISel::SelectStore(const Instruction *I) {
|
|
Value *Op0 = I->getOperand(0);
|
|
unsigned SrcReg = 0;
|
|
|
|
// 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)) 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.
|
|
// TODO: Factor this out.
|
|
if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
|
|
if (CI->hasOneUse() && (CI->getParent() == I->getParent())) {
|
|
MVT VT;
|
|
const Type *Ty = CI->getOperand(0)->getType();
|
|
if (!isTypeLegal(Ty, VT))
|
|
return false;
|
|
|
|
bool isFloat = (Ty->isDoubleTy() || Ty->isFloatTy());
|
|
if (isFloat && !Subtarget->hasVFP2())
|
|
return false;
|
|
|
|
unsigned CmpOpc;
|
|
switch (VT.SimpleTy) {
|
|
default: return false;
|
|
// TODO: Verify compares.
|
|
case MVT::f32:
|
|
CmpOpc = ARM::VCMPES;
|
|
break;
|
|
case MVT::f64:
|
|
CmpOpc = ARM::VCMPED;
|
|
break;
|
|
case MVT::i32:
|
|
CmpOpc = isThumb ? ARM::t2CMPrr : ARM::CMPrr;
|
|
break;
|
|
}
|
|
|
|
// Get the compare predicate.
|
|
ARMCC::CondCodes ARMPred = getComparePred(CI->getPredicate());
|
|
|
|
// We may not handle every CC for now.
|
|
if (ARMPred == ARMCC::AL) return false;
|
|
|
|
unsigned Arg1 = getRegForValue(CI->getOperand(0));
|
|
if (Arg1 == 0) return false;
|
|
|
|
unsigned Arg2 = getRegForValue(CI->getOperand(1));
|
|
if (Arg2 == 0) return false;
|
|
|
|
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(CmpOpc))
|
|
.addReg(Arg1).addReg(Arg2));
|
|
|
|
// For floating point we need to move the result to a comparison register
|
|
// that we can then use for branches.
|
|
if (isFloat)
|
|
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(ARM::FMSTAT)));
|
|
|
|
unsigned BrOpc = isThumb ? 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;
|
|
}
|
|
}
|
|
|
|
unsigned CmpReg = getRegForValue(BI->getCondition());
|
|
if (CmpReg == 0) return false;
|
|
|
|
// Re-set the flags just in case.
|
|
unsigned CmpOpc = isThumb ? ARM::t2CMPri : ARM::CMPri;
|
|
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
|
|
.addReg(CmpReg).addImm(0));
|
|
|
|
unsigned BrOpc = isThumb ? ARM::t2Bcc : ARM::Bcc;
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
|
|
.addMBB(TBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
|
|
FastEmitBranch(FBB, DL);
|
|
FuncInfo.MBB->addSuccessor(TBB);
|
|
return true;
|
|
}
|
|
|
|
bool ARMFastISel::SelectCmp(const Instruction *I) {
|
|
const CmpInst *CI = cast<CmpInst>(I);
|
|
|
|
MVT VT;
|
|
const Type *Ty = CI->getOperand(0)->getType();
|
|
if (!isTypeLegal(Ty, VT))
|
|
return false;
|
|
|
|
bool isFloat = (Ty->isDoubleTy() || Ty->isFloatTy());
|
|
if (isFloat && !Subtarget->hasVFP2())
|
|
return false;
|
|
|
|
unsigned CmpOpc;
|
|
unsigned CondReg;
|
|
switch (VT.SimpleTy) {
|
|
default: return false;
|
|
// TODO: Verify compares.
|
|
case MVT::f32:
|
|
CmpOpc = ARM::VCMPES;
|
|
CondReg = ARM::FPSCR;
|
|
break;
|
|
case MVT::f64:
|
|
CmpOpc = ARM::VCMPED;
|
|
CondReg = ARM::FPSCR;
|
|
break;
|
|
case MVT::i32:
|
|
CmpOpc = isThumb ? ARM::t2CMPrr : ARM::CMPrr;
|
|
CondReg = ARM::CPSR;
|
|
break;
|
|
}
|
|
|
|
// Get the compare predicate.
|
|
ARMCC::CondCodes ARMPred = getComparePred(CI->getPredicate());
|
|
|
|
// We may not handle every CC for now.
|
|
if (ARMPred == ARMCC::AL) return false;
|
|
|
|
unsigned Arg1 = getRegForValue(CI->getOperand(0));
|
|
if (Arg1 == 0) return false;
|
|
|
|
unsigned Arg2 = getRegForValue(CI->getOperand(1));
|
|
if (Arg2 == 0) return false;
|
|
|
|
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
|
|
.addReg(Arg1).addReg(Arg2));
|
|
|
|
// For floating point we need to move the result to a comparison register
|
|
// that we can then use for branches.
|
|
if (isFloat)
|
|
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(ARM::FMSTAT)));
|
|
|
|
// Now set a register based on the comparison. Explicitly set the predicates
|
|
// here.
|
|
unsigned MovCCOpc = isThumb ? ARM::t2MOVCCi : ARM::MOVCCi;
|
|
TargetRegisterClass *RC = isThumb ? ARM::rGPRRegisterClass
|
|
: ARM::GPRRegisterClass;
|
|
unsigned DestReg = createResultReg(RC);
|
|
Constant *Zero
|
|
= ConstantInt::get(Type::getInt32Ty(*Context), 0);
|
|
unsigned ZeroReg = TargetMaterializeConstant(Zero);
|
|
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::SelectSIToFP(const Instruction *I) {
|
|
// Make sure we have VFP.
|
|
if (!Subtarget->hasVFP2()) return false;
|
|
|
|
MVT DstVT;
|
|
const Type *Ty = I->getType();
|
|
if (!isTypeLegal(Ty, DstVT))
|
|
return false;
|
|
|
|
unsigned Op = getRegForValue(I->getOperand(0));
|
|
if (Op == 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, Op);
|
|
if (FP == 0) return false;
|
|
|
|
unsigned Opc;
|
|
if (Ty->isFloatTy()) Opc = ARM::VSITOS;
|
|
else if (Ty->isDoubleTy()) Opc = ARM::VSITOD;
|
|
else return 0;
|
|
|
|
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::SelectFPToSI(const Instruction *I) {
|
|
// Make sure we have VFP.
|
|
if (!Subtarget->hasVFP2()) return false;
|
|
|
|
MVT DstVT;
|
|
const Type *RetTy = I->getType();
|
|
if (!isTypeLegal(RetTy, DstVT))
|
|
return false;
|
|
|
|
unsigned Op = getRegForValue(I->getOperand(0));
|
|
if (Op == 0) return false;
|
|
|
|
unsigned Opc;
|
|
const Type *OpTy = I->getOperand(0)->getType();
|
|
if (OpTy->isFloatTy()) Opc = ARM::VTOSIZS;
|
|
else if (OpTy->isDoubleTy()) Opc = ARM::VTOSIZD;
|
|
else return 0;
|
|
|
|
// f64->s32 or f32->s32 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;
|
|
unsigned Op2Reg = getRegForValue(I->getOperand(2));
|
|
if (Op2Reg == 0) return false;
|
|
|
|
unsigned CmpOpc = isThumb ? ARM::t2TSTri : ARM::TSTri;
|
|
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
|
|
.addReg(CondReg).addImm(1));
|
|
unsigned ResultReg = createResultReg(RC);
|
|
unsigned MovCCOpc = isThumb ? ARM::t2MOVCCr : ARM::MOVCCr;
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), ResultReg)
|
|
.addReg(Op1Reg).addReg(Op2Reg)
|
|
.addImm(ARMCC::EQ).addReg(ARM::CPSR);
|
|
UpdateValueMap(I, ResultReg);
|
|
return true;
|
|
}
|
|
|
|
bool ARMFastISel::SelectSDiv(const Instruction *I) {
|
|
MVT VT;
|
|
const 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 = RTLIB::SDIV_I8;
|
|
else if (VT == MVT::i16)
|
|
LC = RTLIB::SDIV_I16;
|
|
else if (VT == MVT::i32)
|
|
LC = RTLIB::SDIV_I32;
|
|
else if (VT == MVT::i64)
|
|
LC = RTLIB::SDIV_I64;
|
|
else if (VT == MVT::i128)
|
|
LC = RTLIB::SDIV_I128;
|
|
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SDIV!");
|
|
|
|
return ARMEmitLibcall(I, LC);
|
|
}
|
|
|
|
bool ARMFastISel::SelectSRem(const Instruction *I) {
|
|
MVT VT;
|
|
const Type *Ty = I->getType();
|
|
if (!isTypeLegal(Ty, VT))
|
|
return false;
|
|
|
|
RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
|
|
if (VT == MVT::i8)
|
|
LC = RTLIB::SREM_I8;
|
|
else if (VT == MVT::i16)
|
|
LC = RTLIB::SREM_I16;
|
|
else if (VT == MVT::i32)
|
|
LC = RTLIB::SREM_I32;
|
|
else if (VT == MVT::i64)
|
|
LC = RTLIB::SREM_I64;
|
|
else if (VT == MVT::i128)
|
|
LC = RTLIB::SREM_I128;
|
|
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SREM!");
|
|
|
|
return ARMEmitLibcall(I, LC);
|
|
}
|
|
|
|
bool ARMFastISel::SelectBinaryOp(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.
|
|
const Type *Ty = I->getType();
|
|
bool isFloat = (Ty->isDoubleTy() || Ty->isFloatTy());
|
|
if (isFloat && !Subtarget->hasVFP2())
|
|
return false;
|
|
|
|
unsigned Op1 = getRegForValue(I->getOperand(0));
|
|
if (Op1 == 0) return false;
|
|
|
|
unsigned Op2 = getRegForValue(I->getOperand(1));
|
|
if (Op2 == 0) 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 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
|
|
|
|
bool ARMFastISel::FastEmitExtend(ISD::NodeType Opc, EVT DstVT, unsigned Src,
|
|
EVT SrcVT, unsigned &ResultReg) {
|
|
unsigned RR = FastEmit_r(SrcVT.getSimpleVT(), DstVT.getSimpleVT(), Opc,
|
|
Src, /*TODO: Kill=*/false);
|
|
|
|
if (RR != 0) {
|
|
ResultReg = RR;
|
|
return true;
|
|
} else
|
|
return false;
|
|
}
|
|
|
|
// 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() &&
|
|
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, 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 = TM.getRegisterInfo()->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 parameters yet.
|
|
if (VA.getLocVT().isVector() && VA.getLocVT().getSizeInBits() > 64)
|
|
return false;
|
|
|
|
// Handle arg promotion, etc.
|
|
switch (VA.getLocInfo()) {
|
|
case CCValAssign::Full: break;
|
|
case CCValAssign::SExt: {
|
|
bool Emitted = FastEmitExtend(ISD::SIGN_EXTEND, VA.getLocVT(),
|
|
Arg, ArgVT, Arg);
|
|
assert(Emitted && "Failed to emit a sext!"); (void)Emitted;
|
|
Emitted = true;
|
|
ArgVT = VA.getLocVT();
|
|
break;
|
|
}
|
|
case CCValAssign::ZExt: {
|
|
bool Emitted = FastEmitExtend(ISD::ZERO_EXTEND, VA.getLocVT(),
|
|
Arg, ArgVT, Arg);
|
|
assert(Emitted && "Failed to emit a zext!"); (void)Emitted;
|
|
Emitted = true;
|
|
ArgVT = VA.getLocVT();
|
|
break;
|
|
}
|
|
case CCValAssign::AExt: {
|
|
bool Emitted = FastEmitExtend(ISD::ANY_EXTEND, VA.getLocVT(),
|
|
Arg, ArgVT, Arg);
|
|
if (!Emitted)
|
|
Emitted = FastEmitExtend(ISD::ZERO_EXTEND, VA.getLocVT(),
|
|
Arg, ArgVT, Arg);
|
|
if (!Emitted)
|
|
Emitted = FastEmitExtend(ISD::SIGN_EXTEND, VA.getLocVT(),
|
|
Arg, ArgVT, Arg);
|
|
|
|
assert(Emitted && "Failed to emit a aext!"); (void)Emitted;
|
|
ArgVT = VA.getLocVT();
|
|
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 = TM.getRegisterInfo()->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, 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();
|
|
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();
|
|
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(), 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;
|
|
// TODO: For now, don't try to handle cases where getLocInfo()
|
|
// says Full but the types don't match.
|
|
if (TLI.getValueType(RV->getType()) != VA.getValVT())
|
|
return false;
|
|
|
|
// Make the copy.
|
|
unsigned SrcReg = Reg + VA.getValNo();
|
|
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 = isThumb ? ARM::tBX_RET : ARM::BX_RET;
|
|
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(RetOpc)));
|
|
return true;
|
|
}
|
|
|
|
// 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.
|
|
const Type *RetTy = I->getType();
|
|
MVT RetVT;
|
|
if (RetTy->isVoidTy())
|
|
RetVT = MVT::isVoid;
|
|
else if (!isTypeLegal(RetTy, RetVT))
|
|
return false;
|
|
|
|
// For now we're using BLX etc on the assumption that we have v5t ops.
|
|
if (!Subtarget->hasV5TOps()) 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;
|
|
|
|
const 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, BLXr9 for darwin, BLX otherwise. This uses V5 ops.
|
|
// TODO: Turn this into the table of arm call ops.
|
|
MachineInstrBuilder MIB;
|
|
unsigned CallOpc;
|
|
if(isThumb) {
|
|
CallOpc = Subtarget->isTargetDarwin() ? ARM::tBLXi_r9 : ARM::tBLXi;
|
|
// Explicitly adding the predicate here.
|
|
MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(CallOpc)))
|
|
.addExternalSymbol(TLI.getLibcallName(Call));
|
|
} else {
|
|
CallOpc = Subtarget->isTargetDarwin() ? ARM::BLr9 : ARM::BL;
|
|
// 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]);
|
|
|
|
// 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 CallInst *CI = cast<CallInst>(I);
|
|
const Value *Callee = CI->getCalledValue();
|
|
|
|
// Can't handle inline asm or worry about intrinsics yet.
|
|
if (isa<InlineAsm>(Callee) || isa<IntrinsicInst>(CI)) return false;
|
|
|
|
// Only handle global variable Callees that are direct calls.
|
|
const GlobalValue *GV = dyn_cast<GlobalValue>(Callee);
|
|
if (!GV || Subtarget->GVIsIndirectSymbol(GV, TM.getRelocationModel()))
|
|
return false;
|
|
|
|
// Check the calling convention.
|
|
ImmutableCallSite CS(CI);
|
|
CallingConv::ID CC = CS.getCallingConv();
|
|
|
|
// TODO: Avoid some calling conventions?
|
|
|
|
// Let SDISel handle vararg functions.
|
|
const PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
|
|
const FunctionType *FTy = cast<FunctionType>(PT->getElementType());
|
|
if (FTy->isVarArg())
|
|
return false;
|
|
|
|
// Handle *simple* calls for now.
|
|
const Type *RetTy = I->getType();
|
|
MVT RetVT;
|
|
if (RetTy->isVoidTy())
|
|
RetVT = MVT::isVoid;
|
|
else if (!isTypeLegal(RetTy, RetVT))
|
|
return false;
|
|
|
|
// For now we're using BLX etc on the assumption that we have v5t ops.
|
|
// TODO: Maybe?
|
|
if (!Subtarget->hasV5TOps()) 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(CS.arg_size());
|
|
ArgRegs.reserve(CS.arg_size());
|
|
ArgVTs.reserve(CS.arg_size());
|
|
ArgFlags.reserve(CS.arg_size());
|
|
for (ImmutableCallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
|
|
i != e; ++i) {
|
|
unsigned Arg = getRegForValue(*i);
|
|
|
|
if (Arg == 0)
|
|
return false;
|
|
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;
|
|
|
|
const Type *ArgTy = (*i)->getType();
|
|
MVT ArgVT;
|
|
if (!isTypeLegal(ArgTy, ArgVT))
|
|
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, BLXr9 for darwin, BLX otherwise. This uses V5 ops.
|
|
// TODO: Turn this into the table of arm call ops.
|
|
MachineInstrBuilder MIB;
|
|
unsigned CallOpc;
|
|
// Explicitly adding the predicate here.
|
|
if(isThumb) {
|
|
CallOpc = Subtarget->isTargetDarwin() ? ARM::tBLXi_r9 : ARM::tBLXi;
|
|
// Explicitly adding the predicate here.
|
|
MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(CallOpc)))
|
|
.addGlobalAddress(GV, 0, 0);
|
|
} else {
|
|
CallOpc = Subtarget->isTargetDarwin() ? ARM::BLr9 : ARM::BL;
|
|
// Explicitly adding the predicate here.
|
|
MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
|
|
TII.get(CallOpc))
|
|
.addGlobalAddress(GV, 0, 0));
|
|
}
|
|
|
|
// Add implicit physical register uses to the call.
|
|
for (unsigned i = 0, e = RegArgs.size(); i != e; ++i)
|
|
MIB.addReg(RegArgs[i]);
|
|
|
|
// 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;
|
|
|
|
}
|
|
|
|
// 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::ICmp:
|
|
case Instruction::FCmp:
|
|
return SelectCmp(I);
|
|
case Instruction::FPExt:
|
|
return SelectFPExt(I);
|
|
case Instruction::FPTrunc:
|
|
return SelectFPTrunc(I);
|
|
case Instruction::SIToFP:
|
|
return SelectSIToFP(I);
|
|
case Instruction::FPToSI:
|
|
return SelectFPToSI(I);
|
|
case Instruction::FAdd:
|
|
return SelectBinaryOp(I, ISD::FADD);
|
|
case Instruction::FSub:
|
|
return SelectBinaryOp(I, ISD::FSUB);
|
|
case Instruction::FMul:
|
|
return SelectBinaryOp(I, ISD::FMUL);
|
|
case Instruction::SDiv:
|
|
return SelectSDiv(I);
|
|
case Instruction::SRem:
|
|
return SelectSRem(I);
|
|
case Instruction::Call:
|
|
return SelectCall(I);
|
|
case Instruction::Select:
|
|
return SelectSelect(I);
|
|
case Instruction::Ret:
|
|
return SelectRet(I);
|
|
default: break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
namespace llvm {
|
|
llvm::FastISel *ARM::createFastISel(FunctionLoweringInfo &funcInfo) {
|
|
// Completely untested on non-darwin.
|
|
const TargetMachine &TM = funcInfo.MF->getTarget();
|
|
|
|
// Darwin and thumb1 only for now.
|
|
const ARMSubtarget *Subtarget = &TM.getSubtarget<ARMSubtarget>();
|
|
if (Subtarget->isTargetDarwin() && !Subtarget->isThumb1Only() &&
|
|
!DisableARMFastISel)
|
|
return new ARMFastISel(funcInfo);
|
|
return 0;
|
|
}
|
|
}
|