mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-25 00:29:20 +00:00
The summary is that it moves the mangling earlier and replaces a few calls to .addExternalSymbol with addSym. I originally wanted to replace all the uses of addExternalSymbol with addSym, but noticed it was a lot of work and doesn't need to be done all at once. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240395 91177308-0d34-0410-b5e6-96231b3b80d8
2351 lines
81 KiB
C++
2351 lines
81 KiB
C++
//===-- PPCFastISel.cpp - PowerPC 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 PowerPC-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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// PPCGenFastISel.inc, which is #included here.
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//
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//===----------------------------------------------------------------------===//
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#include "PPC.h"
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#include "MCTargetDesc/PPCPredicates.h"
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#include "PPCCallingConv.h"
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#include "PPCISelLowering.h"
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#include "PPCMachineFunctionInfo.h"
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#include "PPCSubtarget.h"
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#include "PPCTargetMachine.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/CodeGen/CallingConvLower.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/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/IR/CallingConv.h"
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#include "llvm/IR/GetElementPtrTypeIterator.h"
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#include "llvm/IR/GlobalAlias.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Operator.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetMachine.h"
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//===----------------------------------------------------------------------===//
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//
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// TBD:
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// fastLowerArguments: Handle simple cases.
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// PPCMaterializeGV: Handle TLS.
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// SelectCall: Handle function pointers.
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// SelectCall: Handle multi-register return values.
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// SelectCall: Optimize away nops for local calls.
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// processCallArgs: Handle bit-converted arguments.
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// finishCall: Handle multi-register return values.
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// PPCComputeAddress: Handle parameter references as FrameIndex's.
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// PPCEmitCmp: Handle immediate as operand 1.
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// SelectCall: Handle small byval arguments.
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// SelectIntrinsicCall: Implement.
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// SelectSelect: Implement.
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// Consider factoring isTypeLegal into the base class.
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// Implement switches and jump tables.
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//
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//===----------------------------------------------------------------------===//
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using namespace llvm;
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#define DEBUG_TYPE "ppcfastisel"
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namespace {
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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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long Offset;
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// Innocuous defaults for our address.
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Address()
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: BaseType(RegBase), Offset(0) {
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Base.Reg = 0;
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}
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} Address;
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class PPCFastISel final : public FastISel {
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const TargetMachine &TM;
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const PPCSubtarget *PPCSubTarget;
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PPCFunctionInfo *PPCFuncInfo;
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const TargetInstrInfo &TII;
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const TargetLowering &TLI;
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LLVMContext *Context;
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public:
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explicit PPCFastISel(FunctionLoweringInfo &FuncInfo,
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const TargetLibraryInfo *LibInfo)
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: FastISel(FuncInfo, LibInfo), TM(FuncInfo.MF->getTarget()),
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PPCSubTarget(&FuncInfo.MF->getSubtarget<PPCSubtarget>()),
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PPCFuncInfo(FuncInfo.MF->getInfo<PPCFunctionInfo>()),
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TII(*PPCSubTarget->getInstrInfo()),
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TLI(*PPCSubTarget->getTargetLowering()),
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Context(&FuncInfo.Fn->getContext()) {}
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// Backend specific FastISel code.
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private:
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bool fastSelectInstruction(const Instruction *I) override;
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unsigned fastMaterializeConstant(const Constant *C) override;
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unsigned fastMaterializeAlloca(const AllocaInst *AI) override;
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bool tryToFoldLoadIntoMI(MachineInstr *MI, unsigned OpNo,
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const LoadInst *LI) override;
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bool fastLowerArguments() override;
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unsigned fastEmit_i(MVT Ty, MVT RetTy, unsigned Opc, uint64_t Imm) override;
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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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unsigned fastEmitInst_r(unsigned MachineInstOpcode,
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const TargetRegisterClass *RC,
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unsigned Op0, bool Op0IsKill);
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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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bool fastLowerCall(CallLoweringInfo &CLI) override;
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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 SelectIndirectBr(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 SelectIToFP(const Instruction *I, bool IsSigned);
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bool SelectFPToI(const Instruction *I, bool IsSigned);
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bool SelectBinaryIntOp(const Instruction *I, unsigned ISDOpcode);
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bool SelectRet(const Instruction *I);
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bool SelectTrunc(const Instruction *I);
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bool SelectIntExt(const Instruction *I);
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// Utility routines.
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private:
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bool isTypeLegal(Type *Ty, MVT &VT);
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bool isLoadTypeLegal(Type *Ty, MVT &VT);
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bool isValueAvailable(const Value *V) const;
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bool isVSFRCRegister(unsigned Register) const {
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return MRI.getRegClass(Register)->getID() == PPC::VSFRCRegClassID;
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}
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bool isVSSRCRegister(unsigned Register) const {
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return MRI.getRegClass(Register)->getID() == PPC::VSSRCRegClassID;
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}
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bool PPCEmitCmp(const Value *Src1Value, const Value *Src2Value,
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bool isZExt, unsigned DestReg);
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bool PPCEmitLoad(MVT VT, unsigned &ResultReg, Address &Addr,
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const TargetRegisterClass *RC, bool IsZExt = true,
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unsigned FP64LoadOpc = PPC::LFD);
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bool PPCEmitStore(MVT VT, unsigned SrcReg, Address &Addr);
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bool PPCComputeAddress(const Value *Obj, Address &Addr);
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void PPCSimplifyAddress(Address &Addr, MVT VT, bool &UseOffset,
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unsigned &IndexReg);
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bool PPCEmitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
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unsigned DestReg, bool IsZExt);
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unsigned PPCMaterializeFP(const ConstantFP *CFP, MVT VT);
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unsigned PPCMaterializeGV(const GlobalValue *GV, MVT VT);
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unsigned PPCMaterializeInt(const Constant *C, MVT VT, bool UseSExt = true);
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unsigned PPCMaterialize32BitInt(int64_t Imm,
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const TargetRegisterClass *RC);
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unsigned PPCMaterialize64BitInt(int64_t Imm,
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const TargetRegisterClass *RC);
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unsigned PPCMoveToIntReg(const Instruction *I, MVT VT,
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unsigned SrcReg, bool IsSigned);
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unsigned PPCMoveToFPReg(MVT VT, unsigned SrcReg, bool IsSigned);
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// Call handling routines.
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private:
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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 IsVarArg);
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bool finishCall(MVT RetVT, CallLoweringInfo &CLI, unsigned &NumBytes);
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CCAssignFn *usePPC32CCs(unsigned Flag);
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private:
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#include "PPCGenFastISel.inc"
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};
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} // end anonymous namespace
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#include "PPCGenCallingConv.inc"
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// Function whose sole purpose is to kill compiler warnings
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// stemming from unused functions included from PPCGenCallingConv.inc.
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CCAssignFn *PPCFastISel::usePPC32CCs(unsigned Flag) {
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if (Flag == 1)
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return CC_PPC32_SVR4;
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else if (Flag == 2)
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return CC_PPC32_SVR4_ByVal;
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else if (Flag == 3)
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return CC_PPC32_SVR4_VarArg;
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else
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return RetCC_PPC;
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}
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static Optional<PPC::Predicate> getComparePred(CmpInst::Predicate Pred) {
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switch (Pred) {
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// These are not representable with any single compare.
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case CmpInst::FCMP_FALSE:
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case CmpInst::FCMP_UEQ:
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case CmpInst::FCMP_UGT:
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case CmpInst::FCMP_UGE:
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case CmpInst::FCMP_ULT:
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case CmpInst::FCMP_ULE:
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case CmpInst::FCMP_UNE:
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case CmpInst::FCMP_TRUE:
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default:
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return Optional<PPC::Predicate>();
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case CmpInst::FCMP_OEQ:
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case CmpInst::ICMP_EQ:
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return PPC::PRED_EQ;
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case CmpInst::FCMP_OGT:
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case CmpInst::ICMP_UGT:
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case CmpInst::ICMP_SGT:
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return PPC::PRED_GT;
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case CmpInst::FCMP_OGE:
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case CmpInst::ICMP_UGE:
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case CmpInst::ICMP_SGE:
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return PPC::PRED_GE;
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case CmpInst::FCMP_OLT:
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case CmpInst::ICMP_ULT:
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case CmpInst::ICMP_SLT:
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return PPC::PRED_LT;
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case CmpInst::FCMP_OLE:
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case CmpInst::ICMP_ULE:
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case CmpInst::ICMP_SLE:
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return PPC::PRED_LE;
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case CmpInst::FCMP_ONE:
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case CmpInst::ICMP_NE:
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return PPC::PRED_NE;
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case CmpInst::FCMP_ORD:
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return PPC::PRED_NU;
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case CmpInst::FCMP_UNO:
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return PPC::PRED_UN;
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}
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}
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// Determine whether the type Ty is simple enough to be handled by
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// fast-isel, and return its equivalent machine type in VT.
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// FIXME: Copied directly from ARM -- factor into base class?
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bool PPCFastISel::isTypeLegal(Type *Ty, MVT &VT) {
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EVT Evt = TLI.getValueType(Ty, true);
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// Only handle simple types.
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if (Evt == MVT::Other || !Evt.isSimple()) return false;
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VT = Evt.getSimpleVT();
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// Handle all legal types, i.e. a register that will directly hold this
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// value.
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return TLI.isTypeLegal(VT);
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}
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// Determine whether the type Ty is simple enough to be handled by
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// fast-isel as a load target, and return its equivalent machine type in VT.
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bool PPCFastISel::isLoadTypeLegal(Type *Ty, MVT &VT) {
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if (isTypeLegal(Ty, VT)) return true;
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// If this is a type than can be sign or zero-extended to a basic operation
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// go ahead and accept it now.
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if (VT == MVT::i8 || VT == MVT::i16 || VT == MVT::i32) {
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return true;
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}
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return false;
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}
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bool PPCFastISel::isValueAvailable(const Value *V) const {
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if (!isa<Instruction>(V))
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return true;
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const auto *I = cast<Instruction>(V);
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if (FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB)
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return true;
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return false;
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}
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// Given a value Obj, create an Address object Addr that represents its
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// address. Return false if we can't handle it.
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bool PPCFastISel::PPCComputeAddress(const Value *Obj, Address &Addr) {
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const User *U = nullptr;
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unsigned Opcode = Instruction::UserOp1;
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if (const Instruction *I = dyn_cast<Instruction>(Obj)) {
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// Don't walk into other basic blocks unless the object is an alloca from
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// another block, otherwise it may not have a virtual register assigned.
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if (FuncInfo.StaticAllocaMap.count(static_cast<const AllocaInst *>(Obj)) ||
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FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
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Opcode = I->getOpcode();
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U = I;
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}
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} else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(Obj)) {
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Opcode = C->getOpcode();
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U = C;
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}
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switch (Opcode) {
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default:
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break;
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case Instruction::BitCast:
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// Look through bitcasts.
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return PPCComputeAddress(U->getOperand(0), Addr);
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case Instruction::IntToPtr:
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// Look past no-op inttoptrs.
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if (TLI.getValueType(U->getOperand(0)->getType()) == TLI.getPointerTy())
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return PPCComputeAddress(U->getOperand(0), Addr);
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break;
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case Instruction::PtrToInt:
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// Look past no-op ptrtoints.
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if (TLI.getValueType(U->getType()) == TLI.getPointerTy())
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return PPCComputeAddress(U->getOperand(0), Addr);
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break;
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case Instruction::GetElementPtr: {
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Address SavedAddr = Addr;
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long TmpOffset = Addr.Offset;
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// Iterate through the GEP folding the constants into offsets where
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// we can.
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gep_type_iterator GTI = gep_type_begin(U);
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for (User::const_op_iterator II = U->op_begin() + 1, IE = U->op_end();
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II != IE; ++II, ++GTI) {
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const Value *Op = *II;
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if (StructType *STy = dyn_cast<StructType>(*GTI)) {
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const StructLayout *SL = DL.getStructLayout(STy);
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unsigned Idx = cast<ConstantInt>(Op)->getZExtValue();
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TmpOffset += SL->getElementOffset(Idx);
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} else {
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uint64_t S = DL.getTypeAllocSize(GTI.getIndexedType());
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for (;;) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
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// Constant-offset addressing.
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TmpOffset += CI->getSExtValue() * S;
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break;
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}
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if (canFoldAddIntoGEP(U, Op)) {
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// A compatible add with a constant operand. Fold the constant.
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ConstantInt *CI =
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cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
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TmpOffset += CI->getSExtValue() * S;
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// Iterate on the other operand.
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Op = cast<AddOperator>(Op)->getOperand(0);
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continue;
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}
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// Unsupported
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goto unsupported_gep;
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}
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}
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}
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// Try to grab the base operand now.
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Addr.Offset = TmpOffset;
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if (PPCComputeAddress(U->getOperand(0), Addr)) return true;
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// We failed, restore everything and try the other options.
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Addr = SavedAddr;
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unsupported_gep:
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break;
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}
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case Instruction::Alloca: {
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const AllocaInst *AI = cast<AllocaInst>(Obj);
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DenseMap<const AllocaInst*, int>::iterator SI =
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FuncInfo.StaticAllocaMap.find(AI);
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if (SI != FuncInfo.StaticAllocaMap.end()) {
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Addr.BaseType = Address::FrameIndexBase;
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Addr.Base.FI = SI->second;
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return true;
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}
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break;
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}
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}
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// FIXME: References to parameters fall through to the behavior
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// below. They should be able to reference a frame index since
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// they are stored to the stack, so we can get "ld rx, offset(r1)"
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// instead of "addi ry, r1, offset / ld rx, 0(ry)". Obj will
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// just contain the parameter. Try to handle this with a FI.
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// Try to get this in a register if nothing else has worked.
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if (Addr.Base.Reg == 0)
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Addr.Base.Reg = getRegForValue(Obj);
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// Prevent assignment of base register to X0, which is inappropriate
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// for loads and stores alike.
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if (Addr.Base.Reg != 0)
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MRI.setRegClass(Addr.Base.Reg, &PPC::G8RC_and_G8RC_NOX0RegClass);
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return Addr.Base.Reg != 0;
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}
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// Fix up some addresses that can't be used directly. For example, if
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// an offset won't fit in an instruction field, we may need to move it
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// into an index register.
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void PPCFastISel::PPCSimplifyAddress(Address &Addr, MVT VT, bool &UseOffset,
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unsigned &IndexReg) {
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// Check whether the offset fits in the instruction field.
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if (!isInt<16>(Addr.Offset))
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UseOffset = false;
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// If this is a stack pointer and the offset needs to be simplified then
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// put the alloca address into a register, set the base type back to
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// register and continue. This should almost never happen.
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if (!UseOffset && Addr.BaseType == Address::FrameIndexBase) {
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unsigned ResultReg = createResultReg(&PPC::G8RC_and_G8RC_NOX0RegClass);
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BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::ADDI8),
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ResultReg).addFrameIndex(Addr.Base.FI).addImm(0);
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Addr.Base.Reg = ResultReg;
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Addr.BaseType = Address::RegBase;
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}
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if (!UseOffset) {
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IntegerType *OffsetTy = ((VT == MVT::i32) ? Type::getInt32Ty(*Context)
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: Type::getInt64Ty(*Context));
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const ConstantInt *Offset =
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ConstantInt::getSigned(OffsetTy, (int64_t)(Addr.Offset));
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IndexReg = PPCMaterializeInt(Offset, MVT::i64);
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assert(IndexReg && "Unexpected error in PPCMaterializeInt!");
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}
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}
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// Emit a load instruction if possible, returning true if we succeeded,
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// otherwise false. See commentary below for how the register class of
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// the load is determined.
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bool PPCFastISel::PPCEmitLoad(MVT VT, unsigned &ResultReg, Address &Addr,
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const TargetRegisterClass *RC,
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bool IsZExt, unsigned FP64LoadOpc) {
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unsigned Opc;
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bool UseOffset = true;
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// If ResultReg is given, it determines the register class of the load.
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// Otherwise, RC is the register class to use. If the result of the
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// load isn't anticipated in this block, both may be zero, in which
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// case we must make a conservative guess. In particular, don't assign
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// R0 or X0 to the result register, as the result may be used in a load,
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// store, add-immediate, or isel that won't permit this. (Though
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// perhaps the spill and reload of live-exit values would handle this?)
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const TargetRegisterClass *UseRC =
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(ResultReg ? MRI.getRegClass(ResultReg) :
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(RC ? RC :
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(VT == MVT::f64 ? &PPC::F8RCRegClass :
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(VT == MVT::f32 ? &PPC::F4RCRegClass :
|
|
(VT == MVT::i64 ? &PPC::G8RC_and_G8RC_NOX0RegClass :
|
|
&PPC::GPRC_and_GPRC_NOR0RegClass)))));
|
|
|
|
bool Is32BitInt = UseRC->hasSuperClassEq(&PPC::GPRCRegClass);
|
|
|
|
switch (VT.SimpleTy) {
|
|
default: // e.g., vector types not handled
|
|
return false;
|
|
case MVT::i8:
|
|
Opc = Is32BitInt ? PPC::LBZ : PPC::LBZ8;
|
|
break;
|
|
case MVT::i16:
|
|
Opc = (IsZExt ?
|
|
(Is32BitInt ? PPC::LHZ : PPC::LHZ8) :
|
|
(Is32BitInt ? PPC::LHA : PPC::LHA8));
|
|
break;
|
|
case MVT::i32:
|
|
Opc = (IsZExt ?
|
|
(Is32BitInt ? PPC::LWZ : PPC::LWZ8) :
|
|
(Is32BitInt ? PPC::LWA_32 : PPC::LWA));
|
|
if ((Opc == PPC::LWA || Opc == PPC::LWA_32) && ((Addr.Offset & 3) != 0))
|
|
UseOffset = false;
|
|
break;
|
|
case MVT::i64:
|
|
Opc = PPC::LD;
|
|
assert(UseRC->hasSuperClassEq(&PPC::G8RCRegClass) &&
|
|
"64-bit load with 32-bit target??");
|
|
UseOffset = ((Addr.Offset & 3) == 0);
|
|
break;
|
|
case MVT::f32:
|
|
Opc = PPC::LFS;
|
|
break;
|
|
case MVT::f64:
|
|
Opc = FP64LoadOpc;
|
|
break;
|
|
}
|
|
|
|
// If necessary, materialize the offset into a register and use
|
|
// the indexed form. Also handle stack pointers with special needs.
|
|
unsigned IndexReg = 0;
|
|
PPCSimplifyAddress(Addr, VT, UseOffset, IndexReg);
|
|
|
|
// If this is a potential VSX load with an offset of 0, a VSX indexed load can
|
|
// be used.
|
|
bool IsVSSRC = (ResultReg != 0) && isVSSRCRegister(ResultReg);
|
|
bool IsVSFRC = (ResultReg != 0) && isVSFRCRegister(ResultReg);
|
|
bool Is32VSXLoad = IsVSSRC && Opc == PPC::LFS;
|
|
bool Is64VSXLoad = IsVSSRC && Opc == PPC::LFD;
|
|
if ((Is32VSXLoad || Is64VSXLoad) &&
|
|
(Addr.BaseType != Address::FrameIndexBase) && UseOffset &&
|
|
(Addr.Offset == 0)) {
|
|
UseOffset = false;
|
|
}
|
|
|
|
if (ResultReg == 0)
|
|
ResultReg = createResultReg(UseRC);
|
|
|
|
// Note: If we still have a frame index here, we know the offset is
|
|
// in range, as otherwise PPCSimplifyAddress would have converted it
|
|
// into a RegBase.
|
|
if (Addr.BaseType == Address::FrameIndexBase) {
|
|
// VSX only provides an indexed load.
|
|
if (Is32VSXLoad || Is64VSXLoad) return false;
|
|
|
|
MachineMemOperand *MMO =
|
|
FuncInfo.MF->getMachineMemOperand(
|
|
MachinePointerInfo::getFixedStack(Addr.Base.FI, Addr.Offset),
|
|
MachineMemOperand::MOLoad, MFI.getObjectSize(Addr.Base.FI),
|
|
MFI.getObjectAlignment(Addr.Base.FI));
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
|
|
.addImm(Addr.Offset).addFrameIndex(Addr.Base.FI).addMemOperand(MMO);
|
|
|
|
// Base reg with offset in range.
|
|
} else if (UseOffset) {
|
|
// VSX only provides an indexed load.
|
|
if (Is32VSXLoad || Is64VSXLoad) return false;
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
|
|
.addImm(Addr.Offset).addReg(Addr.Base.Reg);
|
|
|
|
// Indexed form.
|
|
} else {
|
|
// Get the RR opcode corresponding to the RI one. FIXME: It would be
|
|
// preferable to use the ImmToIdxMap from PPCRegisterInfo.cpp, but it
|
|
// is hard to get at.
|
|
switch (Opc) {
|
|
default: llvm_unreachable("Unexpected opcode!");
|
|
case PPC::LBZ: Opc = PPC::LBZX; break;
|
|
case PPC::LBZ8: Opc = PPC::LBZX8; break;
|
|
case PPC::LHZ: Opc = PPC::LHZX; break;
|
|
case PPC::LHZ8: Opc = PPC::LHZX8; break;
|
|
case PPC::LHA: Opc = PPC::LHAX; break;
|
|
case PPC::LHA8: Opc = PPC::LHAX8; break;
|
|
case PPC::LWZ: Opc = PPC::LWZX; break;
|
|
case PPC::LWZ8: Opc = PPC::LWZX8; break;
|
|
case PPC::LWA: Opc = PPC::LWAX; break;
|
|
case PPC::LWA_32: Opc = PPC::LWAX_32; break;
|
|
case PPC::LD: Opc = PPC::LDX; break;
|
|
case PPC::LFS: Opc = IsVSSRC ? PPC::LXSSPX : PPC::LFSX; break;
|
|
case PPC::LFD: Opc = IsVSFRC ? PPC::LXSDX : PPC::LFDX; break;
|
|
}
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
|
|
.addReg(Addr.Base.Reg).addReg(IndexReg);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select a load instruction.
|
|
bool PPCFastISel::SelectLoad(const Instruction *I) {
|
|
// FIXME: No atomic loads are supported.
|
|
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 (!PPCComputeAddress(I->getOperand(0), Addr))
|
|
return false;
|
|
|
|
// Look at the currently assigned register for this instruction
|
|
// to determine the required register class. This is necessary
|
|
// to constrain RA from using R0/X0 when this is not legal.
|
|
unsigned AssignedReg = FuncInfo.ValueMap[I];
|
|
const TargetRegisterClass *RC =
|
|
AssignedReg ? MRI.getRegClass(AssignedReg) : nullptr;
|
|
|
|
unsigned ResultReg = 0;
|
|
if (!PPCEmitLoad(VT, ResultReg, Addr, RC))
|
|
return false;
|
|
updateValueMap(I, ResultReg);
|
|
return true;
|
|
}
|
|
|
|
// Emit a store instruction to store SrcReg at Addr.
|
|
bool PPCFastISel::PPCEmitStore(MVT VT, unsigned SrcReg, Address &Addr) {
|
|
assert(SrcReg && "Nothing to store!");
|
|
unsigned Opc;
|
|
bool UseOffset = true;
|
|
|
|
const TargetRegisterClass *RC = MRI.getRegClass(SrcReg);
|
|
bool Is32BitInt = RC->hasSuperClassEq(&PPC::GPRCRegClass);
|
|
|
|
switch (VT.SimpleTy) {
|
|
default: // e.g., vector types not handled
|
|
return false;
|
|
case MVT::i8:
|
|
Opc = Is32BitInt ? PPC::STB : PPC::STB8;
|
|
break;
|
|
case MVT::i16:
|
|
Opc = Is32BitInt ? PPC::STH : PPC::STH8;
|
|
break;
|
|
case MVT::i32:
|
|
assert(Is32BitInt && "Not GPRC for i32??");
|
|
Opc = PPC::STW;
|
|
break;
|
|
case MVT::i64:
|
|
Opc = PPC::STD;
|
|
UseOffset = ((Addr.Offset & 3) == 0);
|
|
break;
|
|
case MVT::f32:
|
|
Opc = PPC::STFS;
|
|
break;
|
|
case MVT::f64:
|
|
Opc = PPC::STFD;
|
|
break;
|
|
}
|
|
|
|
// If necessary, materialize the offset into a register and use
|
|
// the indexed form. Also handle stack pointers with special needs.
|
|
unsigned IndexReg = 0;
|
|
PPCSimplifyAddress(Addr, VT, UseOffset, IndexReg);
|
|
|
|
// If this is a potential VSX store with an offset of 0, a VSX indexed store
|
|
// can be used.
|
|
bool IsVSSRC = isVSSRCRegister(SrcReg);
|
|
bool IsVSFRC = isVSFRCRegister(SrcReg);
|
|
bool Is32VSXStore = IsVSSRC && Opc == PPC::STFS;
|
|
bool Is64VSXStore = IsVSFRC && Opc == PPC::STFD;
|
|
if ((Is32VSXStore || Is64VSXStore) &&
|
|
(Addr.BaseType != Address::FrameIndexBase) && UseOffset &&
|
|
(Addr.Offset == 0)) {
|
|
UseOffset = false;
|
|
}
|
|
|
|
// Note: If we still have a frame index here, we know the offset is
|
|
// in range, as otherwise PPCSimplifyAddress would have converted it
|
|
// into a RegBase.
|
|
if (Addr.BaseType == Address::FrameIndexBase) {
|
|
// VSX only provides an indexed store.
|
|
if (Is32VSXStore || Is64VSXStore) return false;
|
|
|
|
MachineMemOperand *MMO =
|
|
FuncInfo.MF->getMachineMemOperand(
|
|
MachinePointerInfo::getFixedStack(Addr.Base.FI, Addr.Offset),
|
|
MachineMemOperand::MOStore, MFI.getObjectSize(Addr.Base.FI),
|
|
MFI.getObjectAlignment(Addr.Base.FI));
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
|
|
.addReg(SrcReg)
|
|
.addImm(Addr.Offset)
|
|
.addFrameIndex(Addr.Base.FI)
|
|
.addMemOperand(MMO);
|
|
|
|
// Base reg with offset in range.
|
|
} else if (UseOffset) {
|
|
// VSX only provides an indexed store.
|
|
if (Is32VSXStore || Is64VSXStore) return false;
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
|
|
.addReg(SrcReg).addImm(Addr.Offset).addReg(Addr.Base.Reg);
|
|
|
|
// Indexed form.
|
|
} else {
|
|
// Get the RR opcode corresponding to the RI one. FIXME: It would be
|
|
// preferable to use the ImmToIdxMap from PPCRegisterInfo.cpp, but it
|
|
// is hard to get at.
|
|
switch (Opc) {
|
|
default: llvm_unreachable("Unexpected opcode!");
|
|
case PPC::STB: Opc = PPC::STBX; break;
|
|
case PPC::STH : Opc = PPC::STHX; break;
|
|
case PPC::STW : Opc = PPC::STWX; break;
|
|
case PPC::STB8: Opc = PPC::STBX8; break;
|
|
case PPC::STH8: Opc = PPC::STHX8; break;
|
|
case PPC::STW8: Opc = PPC::STWX8; break;
|
|
case PPC::STD: Opc = PPC::STDX; break;
|
|
case PPC::STFS: Opc = IsVSSRC ? PPC::STXSSPX : PPC::STFSX; break;
|
|
case PPC::STFD: Opc = IsVSFRC ? PPC::STXSDX : PPC::STFDX; break;
|
|
}
|
|
|
|
auto MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
|
|
.addReg(SrcReg);
|
|
|
|
// If we have an index register defined we use it in the store inst,
|
|
// otherwise we use X0 as base as it makes the vector instructions to
|
|
// use zero in the computation of the effective address regardless the
|
|
// content of the register.
|
|
if (IndexReg)
|
|
MIB.addReg(Addr.Base.Reg).addReg(IndexReg);
|
|
else
|
|
MIB.addReg(PPC::ZERO8).addReg(Addr.Base.Reg);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select a store instruction.
|
|
bool PPCFastISel::SelectStore(const Instruction *I) {
|
|
Value *Op0 = I->getOperand(0);
|
|
unsigned SrcReg = 0;
|
|
|
|
// FIXME: No atomics loads are supported.
|
|
if (cast<StoreInst>(I)->isAtomic())
|
|
return false;
|
|
|
|
// Verify we have a legal type before going any further.
|
|
MVT VT;
|
|
if (!isLoadTypeLegal(Op0->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 (!PPCComputeAddress(I->getOperand(1), Addr))
|
|
return false;
|
|
|
|
if (!PPCEmitStore(VT, SrcReg, Addr))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select a branch instruction.
|
|
bool PPCFastISel::SelectBranch(const Instruction *I) {
|
|
const BranchInst *BI = cast<BranchInst>(I);
|
|
MachineBasicBlock *BrBB = FuncInfo.MBB;
|
|
MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
|
|
MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
|
|
|
|
// For now, just try the simplest case where it's fed by a compare.
|
|
if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
|
|
if (isValueAvailable(CI)) {
|
|
Optional<PPC::Predicate> OptPPCPred = getComparePred(CI->getPredicate());
|
|
if (!OptPPCPred)
|
|
return false;
|
|
|
|
PPC::Predicate PPCPred = OptPPCPred.getValue();
|
|
|
|
// Take advantage of fall-through opportunities.
|
|
if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
|
|
std::swap(TBB, FBB);
|
|
PPCPred = PPC::InvertPredicate(PPCPred);
|
|
}
|
|
|
|
unsigned CondReg = createResultReg(&PPC::CRRCRegClass);
|
|
|
|
if (!PPCEmitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned(),
|
|
CondReg))
|
|
return false;
|
|
|
|
BuildMI(*BrBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::BCC))
|
|
.addImm(PPCPred).addReg(CondReg).addMBB(TBB);
|
|
fastEmitBranch(FBB, DbgLoc);
|
|
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, DbgLoc);
|
|
return true;
|
|
}
|
|
|
|
// FIXME: ARM looks for a case where the block containing the compare
|
|
// has been split from the block containing the branch. If this happens,
|
|
// there is a vreg available containing the result of the compare. I'm
|
|
// not sure we can do much, as we've lost the predicate information with
|
|
// the compare instruction -- we have a 4-bit CR but don't know which bit
|
|
// to test here.
|
|
return false;
|
|
}
|
|
|
|
// Attempt to emit a compare of the two source values. Signed and unsigned
|
|
// comparisons are supported. Return false if we can't handle it.
|
|
bool PPCFastISel::PPCEmitCmp(const Value *SrcValue1, const Value *SrcValue2,
|
|
bool IsZExt, unsigned DestReg) {
|
|
Type *Ty = SrcValue1->getType();
|
|
EVT SrcEVT = TLI.getValueType(Ty, true);
|
|
if (!SrcEVT.isSimple())
|
|
return false;
|
|
MVT SrcVT = SrcEVT.getSimpleVT();
|
|
|
|
if (SrcVT == MVT::i1 && PPCSubTarget->useCRBits())
|
|
return false;
|
|
|
|
// See if operand 2 is an immediate encodeable in the compare.
|
|
// FIXME: Operands are not in canonical order at -O0, so an immediate
|
|
// operand in position 1 is a lost opportunity for now. We are
|
|
// similar to ARM in this regard.
|
|
long Imm = 0;
|
|
bool UseImm = false;
|
|
|
|
// Only 16-bit integer constants can be represented in compares for
|
|
// PowerPC. Others will be materialized into a register.
|
|
if (const ConstantInt *ConstInt = dyn_cast<ConstantInt>(SrcValue2)) {
|
|
if (SrcVT == MVT::i64 || SrcVT == MVT::i32 || SrcVT == MVT::i16 ||
|
|
SrcVT == MVT::i8 || SrcVT == MVT::i1) {
|
|
const APInt &CIVal = ConstInt->getValue();
|
|
Imm = (IsZExt) ? (long)CIVal.getZExtValue() : (long)CIVal.getSExtValue();
|
|
if ((IsZExt && isUInt<16>(Imm)) || (!IsZExt && isInt<16>(Imm)))
|
|
UseImm = true;
|
|
}
|
|
}
|
|
|
|
unsigned CmpOpc;
|
|
bool NeedsExt = false;
|
|
switch (SrcVT.SimpleTy) {
|
|
default: return false;
|
|
case MVT::f32:
|
|
CmpOpc = PPC::FCMPUS;
|
|
break;
|
|
case MVT::f64:
|
|
CmpOpc = PPC::FCMPUD;
|
|
break;
|
|
case MVT::i1:
|
|
case MVT::i8:
|
|
case MVT::i16:
|
|
NeedsExt = true;
|
|
// Intentional fall-through.
|
|
case MVT::i32:
|
|
if (!UseImm)
|
|
CmpOpc = IsZExt ? PPC::CMPLW : PPC::CMPW;
|
|
else
|
|
CmpOpc = IsZExt ? PPC::CMPLWI : PPC::CMPWI;
|
|
break;
|
|
case MVT::i64:
|
|
if (!UseImm)
|
|
CmpOpc = IsZExt ? PPC::CMPLD : PPC::CMPD;
|
|
else
|
|
CmpOpc = IsZExt ? PPC::CMPLDI : PPC::CMPDI;
|
|
break;
|
|
}
|
|
|
|
unsigned SrcReg1 = getRegForValue(SrcValue1);
|
|
if (SrcReg1 == 0)
|
|
return false;
|
|
|
|
unsigned SrcReg2 = 0;
|
|
if (!UseImm) {
|
|
SrcReg2 = getRegForValue(SrcValue2);
|
|
if (SrcReg2 == 0)
|
|
return false;
|
|
}
|
|
|
|
if (NeedsExt) {
|
|
unsigned ExtReg = createResultReg(&PPC::GPRCRegClass);
|
|
if (!PPCEmitIntExt(SrcVT, SrcReg1, MVT::i32, ExtReg, IsZExt))
|
|
return false;
|
|
SrcReg1 = ExtReg;
|
|
|
|
if (!UseImm) {
|
|
unsigned ExtReg = createResultReg(&PPC::GPRCRegClass);
|
|
if (!PPCEmitIntExt(SrcVT, SrcReg2, MVT::i32, ExtReg, IsZExt))
|
|
return false;
|
|
SrcReg2 = ExtReg;
|
|
}
|
|
}
|
|
|
|
if (!UseImm)
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CmpOpc), DestReg)
|
|
.addReg(SrcReg1).addReg(SrcReg2);
|
|
else
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CmpOpc), DestReg)
|
|
.addReg(SrcReg1).addImm(Imm);
|
|
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select a floating-point extend instruction.
|
|
bool PPCFastISel::SelectFPExt(const Instruction *I) {
|
|
Value *Src = I->getOperand(0);
|
|
EVT SrcVT = TLI.getValueType(Src->getType(), true);
|
|
EVT DestVT = TLI.getValueType(I->getType(), true);
|
|
|
|
if (SrcVT != MVT::f32 || DestVT != MVT::f64)
|
|
return false;
|
|
|
|
unsigned SrcReg = getRegForValue(Src);
|
|
if (!SrcReg)
|
|
return false;
|
|
|
|
// No code is generated for a FP extend.
|
|
updateValueMap(I, SrcReg);
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select a floating-point truncate instruction.
|
|
bool PPCFastISel::SelectFPTrunc(const Instruction *I) {
|
|
Value *Src = I->getOperand(0);
|
|
EVT SrcVT = TLI.getValueType(Src->getType(), true);
|
|
EVT DestVT = TLI.getValueType(I->getType(), true);
|
|
|
|
if (SrcVT != MVT::f64 || DestVT != MVT::f32)
|
|
return false;
|
|
|
|
unsigned SrcReg = getRegForValue(Src);
|
|
if (!SrcReg)
|
|
return false;
|
|
|
|
// Round the result to single precision.
|
|
unsigned DestReg = createResultReg(&PPC::F4RCRegClass);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::FRSP), DestReg)
|
|
.addReg(SrcReg);
|
|
|
|
updateValueMap(I, DestReg);
|
|
return true;
|
|
}
|
|
|
|
// Move an i32 or i64 value in a GPR to an f64 value in an FPR.
|
|
// FIXME: When direct register moves are implemented (see PowerISA 2.07),
|
|
// those should be used instead of moving via a stack slot when the
|
|
// subtarget permits.
|
|
// FIXME: The code here is sloppy for the 4-byte case. Can use a 4-byte
|
|
// stack slot and 4-byte store/load sequence. Or just sext the 4-byte
|
|
// case to 8 bytes which produces tighter code but wastes stack space.
|
|
unsigned PPCFastISel::PPCMoveToFPReg(MVT SrcVT, unsigned SrcReg,
|
|
bool IsSigned) {
|
|
|
|
// If necessary, extend 32-bit int to 64-bit.
|
|
if (SrcVT == MVT::i32) {
|
|
unsigned TmpReg = createResultReg(&PPC::G8RCRegClass);
|
|
if (!PPCEmitIntExt(MVT::i32, SrcReg, MVT::i64, TmpReg, !IsSigned))
|
|
return 0;
|
|
SrcReg = TmpReg;
|
|
}
|
|
|
|
// Get a stack slot 8 bytes wide, aligned on an 8-byte boundary.
|
|
Address Addr;
|
|
Addr.BaseType = Address::FrameIndexBase;
|
|
Addr.Base.FI = MFI.CreateStackObject(8, 8, false);
|
|
|
|
// Store the value from the GPR.
|
|
if (!PPCEmitStore(MVT::i64, SrcReg, Addr))
|
|
return 0;
|
|
|
|
// Load the integer value into an FPR. The kind of load used depends
|
|
// on a number of conditions.
|
|
unsigned LoadOpc = PPC::LFD;
|
|
|
|
if (SrcVT == MVT::i32) {
|
|
if (!IsSigned) {
|
|
LoadOpc = PPC::LFIWZX;
|
|
Addr.Offset = (PPCSubTarget->isLittleEndian()) ? 0 : 4;
|
|
} else if (PPCSubTarget->hasLFIWAX()) {
|
|
LoadOpc = PPC::LFIWAX;
|
|
Addr.Offset = (PPCSubTarget->isLittleEndian()) ? 0 : 4;
|
|
}
|
|
}
|
|
|
|
const TargetRegisterClass *RC = &PPC::F8RCRegClass;
|
|
unsigned ResultReg = 0;
|
|
if (!PPCEmitLoad(MVT::f64, ResultReg, Addr, RC, !IsSigned, LoadOpc))
|
|
return 0;
|
|
|
|
return ResultReg;
|
|
}
|
|
|
|
// Attempt to fast-select an integer-to-floating-point conversion.
|
|
// FIXME: Once fast-isel has better support for VSX, conversions using
|
|
// direct moves should be implemented.
|
|
bool PPCFastISel::SelectIToFP(const Instruction *I, bool IsSigned) {
|
|
MVT DstVT;
|
|
Type *DstTy = I->getType();
|
|
if (!isTypeLegal(DstTy, DstVT))
|
|
return false;
|
|
|
|
if (DstVT != MVT::f32 && DstVT != MVT::f64)
|
|
return false;
|
|
|
|
Value *Src = I->getOperand(0);
|
|
EVT SrcEVT = TLI.getValueType(Src->getType(), true);
|
|
if (!SrcEVT.isSimple())
|
|
return false;
|
|
|
|
MVT SrcVT = SrcEVT.getSimpleVT();
|
|
|
|
if (SrcVT != MVT::i8 && SrcVT != MVT::i16 &&
|
|
SrcVT != MVT::i32 && SrcVT != MVT::i64)
|
|
return false;
|
|
|
|
unsigned SrcReg = getRegForValue(Src);
|
|
if (SrcReg == 0)
|
|
return false;
|
|
|
|
// We can only lower an unsigned convert if we have the newer
|
|
// floating-point conversion operations.
|
|
if (!IsSigned && !PPCSubTarget->hasFPCVT())
|
|
return false;
|
|
|
|
// FIXME: For now we require the newer floating-point conversion operations
|
|
// (which are present only on P7 and A2 server models) when converting
|
|
// to single-precision float. Otherwise we have to generate a lot of
|
|
// fiddly code to avoid double rounding. If necessary, the fiddly code
|
|
// can be found in PPCTargetLowering::LowerINT_TO_FP().
|
|
if (DstVT == MVT::f32 && !PPCSubTarget->hasFPCVT())
|
|
return false;
|
|
|
|
// Extend the input if necessary.
|
|
if (SrcVT == MVT::i8 || SrcVT == MVT::i16) {
|
|
unsigned TmpReg = createResultReg(&PPC::G8RCRegClass);
|
|
if (!PPCEmitIntExt(SrcVT, SrcReg, MVT::i64, TmpReg, !IsSigned))
|
|
return false;
|
|
SrcVT = MVT::i64;
|
|
SrcReg = TmpReg;
|
|
}
|
|
|
|
// Move the integer value to an FPR.
|
|
unsigned FPReg = PPCMoveToFPReg(SrcVT, SrcReg, IsSigned);
|
|
if (FPReg == 0)
|
|
return false;
|
|
|
|
// Determine the opcode for the conversion.
|
|
const TargetRegisterClass *RC = &PPC::F8RCRegClass;
|
|
unsigned DestReg = createResultReg(RC);
|
|
unsigned Opc;
|
|
|
|
if (DstVT == MVT::f32)
|
|
Opc = IsSigned ? PPC::FCFIDS : PPC::FCFIDUS;
|
|
else
|
|
Opc = IsSigned ? PPC::FCFID : PPC::FCFIDU;
|
|
|
|
// Generate the convert.
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), DestReg)
|
|
.addReg(FPReg);
|
|
|
|
updateValueMap(I, DestReg);
|
|
return true;
|
|
}
|
|
|
|
// Move the floating-point value in SrcReg into an integer destination
|
|
// register, and return the register (or zero if we can't handle it).
|
|
// FIXME: When direct register moves are implemented (see PowerISA 2.07),
|
|
// those should be used instead of moving via a stack slot when the
|
|
// subtarget permits.
|
|
unsigned PPCFastISel::PPCMoveToIntReg(const Instruction *I, MVT VT,
|
|
unsigned SrcReg, bool IsSigned) {
|
|
// Get a stack slot 8 bytes wide, aligned on an 8-byte boundary.
|
|
// Note that if have STFIWX available, we could use a 4-byte stack
|
|
// slot for i32, but this being fast-isel we'll just go with the
|
|
// easiest code gen possible.
|
|
Address Addr;
|
|
Addr.BaseType = Address::FrameIndexBase;
|
|
Addr.Base.FI = MFI.CreateStackObject(8, 8, false);
|
|
|
|
// Store the value from the FPR.
|
|
if (!PPCEmitStore(MVT::f64, SrcReg, Addr))
|
|
return 0;
|
|
|
|
// Reload it into a GPR. If we want an i32, modify the address
|
|
// to have a 4-byte offset so we load from the right place.
|
|
if (VT == MVT::i32)
|
|
Addr.Offset = 4;
|
|
|
|
// Look at the currently assigned register for this instruction
|
|
// to determine the required register class.
|
|
unsigned AssignedReg = FuncInfo.ValueMap[I];
|
|
const TargetRegisterClass *RC =
|
|
AssignedReg ? MRI.getRegClass(AssignedReg) : nullptr;
|
|
|
|
unsigned ResultReg = 0;
|
|
if (!PPCEmitLoad(VT, ResultReg, Addr, RC, !IsSigned))
|
|
return 0;
|
|
|
|
return ResultReg;
|
|
}
|
|
|
|
// Attempt to fast-select a floating-point-to-integer conversion.
|
|
// FIXME: Once fast-isel has better support for VSX, conversions using
|
|
// direct moves should be implemented.
|
|
bool PPCFastISel::SelectFPToI(const Instruction *I, bool IsSigned) {
|
|
MVT DstVT, SrcVT;
|
|
Type *DstTy = I->getType();
|
|
if (!isTypeLegal(DstTy, DstVT))
|
|
return false;
|
|
|
|
if (DstVT != MVT::i32 && DstVT != MVT::i64)
|
|
return false;
|
|
|
|
// If we don't have FCTIDUZ and we need it, punt to SelectionDAG.
|
|
if (DstVT == MVT::i64 && !IsSigned && !PPCSubTarget->hasFPCVT())
|
|
return false;
|
|
|
|
Value *Src = I->getOperand(0);
|
|
Type *SrcTy = Src->getType();
|
|
if (!isTypeLegal(SrcTy, SrcVT))
|
|
return false;
|
|
|
|
if (SrcVT != MVT::f32 && SrcVT != MVT::f64)
|
|
return false;
|
|
|
|
unsigned SrcReg = getRegForValue(Src);
|
|
if (SrcReg == 0)
|
|
return false;
|
|
|
|
// Convert f32 to f64 if necessary. This is just a meaningless copy
|
|
// to get the register class right. COPY_TO_REGCLASS is needed since
|
|
// a COPY from F4RC to F8RC is converted to a F4RC-F4RC copy downstream.
|
|
const TargetRegisterClass *InRC = MRI.getRegClass(SrcReg);
|
|
if (InRC == &PPC::F4RCRegClass) {
|
|
unsigned TmpReg = createResultReg(&PPC::F8RCRegClass);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(TargetOpcode::COPY_TO_REGCLASS), TmpReg)
|
|
.addReg(SrcReg).addImm(PPC::F8RCRegClassID);
|
|
SrcReg = TmpReg;
|
|
}
|
|
|
|
// Determine the opcode for the conversion, which takes place
|
|
// entirely within FPRs.
|
|
unsigned DestReg = createResultReg(&PPC::F8RCRegClass);
|
|
unsigned Opc;
|
|
|
|
if (DstVT == MVT::i32)
|
|
if (IsSigned)
|
|
Opc = PPC::FCTIWZ;
|
|
else
|
|
Opc = PPCSubTarget->hasFPCVT() ? PPC::FCTIWUZ : PPC::FCTIDZ;
|
|
else
|
|
Opc = IsSigned ? PPC::FCTIDZ : PPC::FCTIDUZ;
|
|
|
|
// Generate the convert.
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), DestReg)
|
|
.addReg(SrcReg);
|
|
|
|
// Now move the integer value from a float register to an integer register.
|
|
unsigned IntReg = PPCMoveToIntReg(I, DstVT, DestReg, IsSigned);
|
|
if (IntReg == 0)
|
|
return false;
|
|
|
|
updateValueMap(I, IntReg);
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select a binary integer operation that isn't already
|
|
// handled automatically.
|
|
bool PPCFastISel::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)
|
|
return false;
|
|
|
|
// Look at the currently assigned register for this instruction
|
|
// to determine the required register class. If there is no register,
|
|
// make a conservative choice (don't assign R0).
|
|
unsigned AssignedReg = FuncInfo.ValueMap[I];
|
|
const TargetRegisterClass *RC =
|
|
(AssignedReg ? MRI.getRegClass(AssignedReg) :
|
|
&PPC::GPRC_and_GPRC_NOR0RegClass);
|
|
bool IsGPRC = RC->hasSuperClassEq(&PPC::GPRCRegClass);
|
|
|
|
unsigned Opc;
|
|
switch (ISDOpcode) {
|
|
default: return false;
|
|
case ISD::ADD:
|
|
Opc = IsGPRC ? PPC::ADD4 : PPC::ADD8;
|
|
break;
|
|
case ISD::OR:
|
|
Opc = IsGPRC ? PPC::OR : PPC::OR8;
|
|
break;
|
|
case ISD::SUB:
|
|
Opc = IsGPRC ? PPC::SUBF : PPC::SUBF8;
|
|
break;
|
|
}
|
|
|
|
unsigned ResultReg = createResultReg(RC ? RC : &PPC::G8RCRegClass);
|
|
unsigned SrcReg1 = getRegForValue(I->getOperand(0));
|
|
if (SrcReg1 == 0) return false;
|
|
|
|
// Handle case of small immediate operand.
|
|
if (const ConstantInt *ConstInt = dyn_cast<ConstantInt>(I->getOperand(1))) {
|
|
const APInt &CIVal = ConstInt->getValue();
|
|
int Imm = (int)CIVal.getSExtValue();
|
|
bool UseImm = true;
|
|
if (isInt<16>(Imm)) {
|
|
switch (Opc) {
|
|
default:
|
|
llvm_unreachable("Missing case!");
|
|
case PPC::ADD4:
|
|
Opc = PPC::ADDI;
|
|
MRI.setRegClass(SrcReg1, &PPC::GPRC_and_GPRC_NOR0RegClass);
|
|
break;
|
|
case PPC::ADD8:
|
|
Opc = PPC::ADDI8;
|
|
MRI.setRegClass(SrcReg1, &PPC::G8RC_and_G8RC_NOX0RegClass);
|
|
break;
|
|
case PPC::OR:
|
|
Opc = PPC::ORI;
|
|
break;
|
|
case PPC::OR8:
|
|
Opc = PPC::ORI8;
|
|
break;
|
|
case PPC::SUBF:
|
|
if (Imm == -32768)
|
|
UseImm = false;
|
|
else {
|
|
Opc = PPC::ADDI;
|
|
MRI.setRegClass(SrcReg1, &PPC::GPRC_and_GPRC_NOR0RegClass);
|
|
Imm = -Imm;
|
|
}
|
|
break;
|
|
case PPC::SUBF8:
|
|
if (Imm == -32768)
|
|
UseImm = false;
|
|
else {
|
|
Opc = PPC::ADDI8;
|
|
MRI.setRegClass(SrcReg1, &PPC::G8RC_and_G8RC_NOX0RegClass);
|
|
Imm = -Imm;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (UseImm) {
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc),
|
|
ResultReg)
|
|
.addReg(SrcReg1)
|
|
.addImm(Imm);
|
|
updateValueMap(I, ResultReg);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Reg-reg case.
|
|
unsigned SrcReg2 = getRegForValue(I->getOperand(1));
|
|
if (SrcReg2 == 0) return false;
|
|
|
|
// Reverse operands for subtract-from.
|
|
if (ISDOpcode == ISD::SUB)
|
|
std::swap(SrcReg1, SrcReg2);
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
|
|
.addReg(SrcReg1).addReg(SrcReg2);
|
|
updateValueMap(I, ResultReg);
|
|
return true;
|
|
}
|
|
|
|
// Handle arguments to a call that we're attempting to fast-select.
|
|
// Return false if the arguments are too complex for us at the moment.
|
|
bool PPCFastISel::processCallArgs(SmallVectorImpl<Value*> &Args,
|
|
SmallVectorImpl<unsigned> &ArgRegs,
|
|
SmallVectorImpl<MVT> &ArgVTs,
|
|
SmallVectorImpl<ISD::ArgFlagsTy> &ArgFlags,
|
|
SmallVectorImpl<unsigned> &RegArgs,
|
|
CallingConv::ID CC,
|
|
unsigned &NumBytes,
|
|
bool IsVarArg) {
|
|
SmallVector<CCValAssign, 16> ArgLocs;
|
|
CCState CCInfo(CC, IsVarArg, *FuncInfo.MF, ArgLocs, *Context);
|
|
|
|
// Reserve space for the linkage area on the stack.
|
|
unsigned LinkageSize = PPCSubTarget->getFrameLowering()->getLinkageSize();
|
|
CCInfo.AllocateStack(LinkageSize, 8);
|
|
|
|
CCInfo.AnalyzeCallOperands(ArgVTs, ArgFlags, CC_PPC64_ELF_FIS);
|
|
|
|
// Bail out if we can't handle any of the arguments.
|
|
for (unsigned I = 0, E = ArgLocs.size(); I != E; ++I) {
|
|
CCValAssign &VA = ArgLocs[I];
|
|
MVT ArgVT = ArgVTs[VA.getValNo()];
|
|
|
|
// Skip vector arguments for now, as well as long double and
|
|
// uint128_t, and anything that isn't passed in a register.
|
|
if (ArgVT.isVector() || ArgVT.getSizeInBits() > 64 || ArgVT == MVT::i1 ||
|
|
!VA.isRegLoc() || VA.needsCustom())
|
|
return false;
|
|
|
|
// Skip bit-converted arguments for now.
|
|
if (VA.getLocInfo() == CCValAssign::BCvt)
|
|
return false;
|
|
}
|
|
|
|
// Get a count of how many bytes are to be pushed onto the stack.
|
|
NumBytes = CCInfo.getNextStackOffset();
|
|
|
|
// The prolog code of the callee may store up to 8 GPR argument registers to
|
|
// the stack, allowing va_start to index over them in memory if its varargs.
|
|
// Because we cannot tell if this is needed on the caller side, we have to
|
|
// conservatively assume that it is needed. As such, make sure we have at
|
|
// least enough stack space for the caller to store the 8 GPRs.
|
|
// FIXME: On ELFv2, it may be unnecessary to allocate the parameter area.
|
|
NumBytes = std::max(NumBytes, LinkageSize + 64);
|
|
|
|
// Issue CALLSEQ_START.
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(TII.getCallFrameSetupOpcode()))
|
|
.addImm(NumBytes);
|
|
|
|
// Prepare to assign register arguments. Every argument uses up a
|
|
// GPR protocol register even if it's passed in a floating-point
|
|
// register (unless we're using the fast calling convention).
|
|
unsigned NextGPR = PPC::X3;
|
|
unsigned NextFPR = PPC::F1;
|
|
|
|
// Process arguments.
|
|
for (unsigned I = 0, E = ArgLocs.size(); I != E; ++I) {
|
|
CCValAssign &VA = ArgLocs[I];
|
|
unsigned Arg = ArgRegs[VA.getValNo()];
|
|
MVT ArgVT = ArgVTs[VA.getValNo()];
|
|
|
|
// Handle argument promotion and bitcasts.
|
|
switch (VA.getLocInfo()) {
|
|
default:
|
|
llvm_unreachable("Unknown loc info!");
|
|
case CCValAssign::Full:
|
|
break;
|
|
case CCValAssign::SExt: {
|
|
MVT DestVT = VA.getLocVT();
|
|
const TargetRegisterClass *RC =
|
|
(DestVT == MVT::i64) ? &PPC::G8RCRegClass : &PPC::GPRCRegClass;
|
|
unsigned TmpReg = createResultReg(RC);
|
|
if (!PPCEmitIntExt(ArgVT, Arg, DestVT, TmpReg, /*IsZExt*/false))
|
|
llvm_unreachable("Failed to emit a sext!");
|
|
ArgVT = DestVT;
|
|
Arg = TmpReg;
|
|
break;
|
|
}
|
|
case CCValAssign::AExt:
|
|
case CCValAssign::ZExt: {
|
|
MVT DestVT = VA.getLocVT();
|
|
const TargetRegisterClass *RC =
|
|
(DestVT == MVT::i64) ? &PPC::G8RCRegClass : &PPC::GPRCRegClass;
|
|
unsigned TmpReg = createResultReg(RC);
|
|
if (!PPCEmitIntExt(ArgVT, Arg, DestVT, TmpReg, /*IsZExt*/true))
|
|
llvm_unreachable("Failed to emit a zext!");
|
|
ArgVT = DestVT;
|
|
Arg = TmpReg;
|
|
break;
|
|
}
|
|
case CCValAssign::BCvt: {
|
|
// FIXME: Not yet handled.
|
|
llvm_unreachable("Should have bailed before getting here!");
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Copy this argument to the appropriate register.
|
|
unsigned ArgReg;
|
|
if (ArgVT == MVT::f32 || ArgVT == MVT::f64) {
|
|
ArgReg = NextFPR++;
|
|
if (CC != CallingConv::Fast)
|
|
++NextGPR;
|
|
} else
|
|
ArgReg = NextGPR++;
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(TargetOpcode::COPY), ArgReg).addReg(Arg);
|
|
RegArgs.push_back(ArgReg);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// For a call that we've determined we can fast-select, finish the
|
|
// call sequence and generate a copy to obtain the return value (if any).
|
|
bool PPCFastISel::finishCall(MVT RetVT, CallLoweringInfo &CLI, unsigned &NumBytes) {
|
|
CallingConv::ID CC = CLI.CallConv;
|
|
|
|
// Issue CallSEQ_END.
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(TII.getCallFrameDestroyOpcode()))
|
|
.addImm(NumBytes).addImm(0);
|
|
|
|
// Next, generate a copy to obtain the return value.
|
|
// FIXME: No multi-register return values yet, though I don't foresee
|
|
// any real difficulties there.
|
|
if (RetVT != MVT::isVoid) {
|
|
SmallVector<CCValAssign, 16> RVLocs;
|
|
CCState CCInfo(CC, false, *FuncInfo.MF, RVLocs, *Context);
|
|
CCInfo.AnalyzeCallResult(RetVT, RetCC_PPC64_ELF_FIS);
|
|
CCValAssign &VA = RVLocs[0];
|
|
assert(RVLocs.size() == 1 && "No support for multi-reg return values!");
|
|
assert(VA.isRegLoc() && "Can only return in registers!");
|
|
|
|
MVT DestVT = VA.getValVT();
|
|
MVT CopyVT = DestVT;
|
|
|
|
// Ints smaller than a register still arrive in a full 64-bit
|
|
// register, so make sure we recognize this.
|
|
if (RetVT == MVT::i8 || RetVT == MVT::i16 || RetVT == MVT::i32)
|
|
CopyVT = MVT::i64;
|
|
|
|
unsigned SourcePhysReg = VA.getLocReg();
|
|
unsigned ResultReg = 0;
|
|
|
|
if (RetVT == CopyVT) {
|
|
const TargetRegisterClass *CpyRC = TLI.getRegClassFor(CopyVT);
|
|
ResultReg = createResultReg(CpyRC);
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(TargetOpcode::COPY), ResultReg)
|
|
.addReg(SourcePhysReg);
|
|
|
|
// If necessary, round the floating result to single precision.
|
|
} else if (CopyVT == MVT::f64) {
|
|
ResultReg = createResultReg(TLI.getRegClassFor(RetVT));
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::FRSP),
|
|
ResultReg).addReg(SourcePhysReg);
|
|
|
|
// If only the low half of a general register is needed, generate
|
|
// a GPRC copy instead of a G8RC copy. (EXTRACT_SUBREG can't be
|
|
// used along the fast-isel path (not lowered), and downstream logic
|
|
// also doesn't like a direct subreg copy on a physical reg.)
|
|
} else if (RetVT == MVT::i8 || RetVT == MVT::i16 || RetVT == MVT::i32) {
|
|
ResultReg = createResultReg(&PPC::GPRCRegClass);
|
|
// Convert physical register from G8RC to GPRC.
|
|
SourcePhysReg -= PPC::X0 - PPC::R0;
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(TargetOpcode::COPY), ResultReg)
|
|
.addReg(SourcePhysReg);
|
|
}
|
|
|
|
assert(ResultReg && "ResultReg unset!");
|
|
CLI.InRegs.push_back(SourcePhysReg);
|
|
CLI.ResultReg = ResultReg;
|
|
CLI.NumResultRegs = 1;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool PPCFastISel::fastLowerCall(CallLoweringInfo &CLI) {
|
|
CallingConv::ID CC = CLI.CallConv;
|
|
bool IsTailCall = CLI.IsTailCall;
|
|
bool IsVarArg = CLI.IsVarArg;
|
|
const Value *Callee = CLI.Callee;
|
|
const MCSymbol *Symbol = CLI.Symbol;
|
|
|
|
if (!Callee && !Symbol)
|
|
return false;
|
|
|
|
// Allow SelectionDAG isel to handle tail calls.
|
|
if (IsTailCall)
|
|
return false;
|
|
|
|
// Let SDISel handle vararg functions.
|
|
if (IsVarArg)
|
|
return false;
|
|
|
|
// Handle simple calls for now, with legal return types and
|
|
// those that can be extended.
|
|
Type *RetTy = CLI.RetTy;
|
|
MVT RetVT;
|
|
if (RetTy->isVoidTy())
|
|
RetVT = MVT::isVoid;
|
|
else if (!isTypeLegal(RetTy, RetVT) && RetVT != MVT::i16 &&
|
|
RetVT != MVT::i8)
|
|
return false;
|
|
else if (RetVT == MVT::i1 && PPCSubTarget->useCRBits())
|
|
// We can't handle boolean returns when CR bits are in use.
|
|
return false;
|
|
|
|
// FIXME: No multi-register return values yet.
|
|
if (RetVT != MVT::isVoid && RetVT != MVT::i8 && RetVT != MVT::i16 &&
|
|
RetVT != MVT::i32 && RetVT != MVT::i64 && RetVT != MVT::f32 &&
|
|
RetVT != MVT::f64) {
|
|
SmallVector<CCValAssign, 16> RVLocs;
|
|
CCState CCInfo(CC, IsVarArg, *FuncInfo.MF, RVLocs, *Context);
|
|
CCInfo.AnalyzeCallResult(RetVT, RetCC_PPC64_ELF_FIS);
|
|
if (RVLocs.size() > 1)
|
|
return false;
|
|
}
|
|
|
|
// Bail early if more than 8 arguments, as we only currently
|
|
// handle arguments passed in registers.
|
|
unsigned NumArgs = CLI.OutVals.size();
|
|
if (NumArgs > 8)
|
|
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(NumArgs);
|
|
ArgRegs.reserve(NumArgs);
|
|
ArgVTs.reserve(NumArgs);
|
|
ArgFlags.reserve(NumArgs);
|
|
|
|
for (unsigned i = 0, ie = NumArgs; i != ie; ++i) {
|
|
// Only handle easy calls for now. It would be reasonably easy
|
|
// to handle <= 8-byte structures passed ByVal in registers, but we
|
|
// have to ensure they are right-justified in the register.
|
|
ISD::ArgFlagsTy Flags = CLI.OutFlags[i];
|
|
if (Flags.isInReg() || Flags.isSRet() || Flags.isNest() || Flags.isByVal())
|
|
return false;
|
|
|
|
Value *ArgValue = CLI.OutVals[i];
|
|
Type *ArgTy = ArgValue->getType();
|
|
MVT ArgVT;
|
|
if (!isTypeLegal(ArgTy, ArgVT) && ArgVT != MVT::i16 && ArgVT != MVT::i8)
|
|
return false;
|
|
|
|
if (ArgVT.isVector())
|
|
return false;
|
|
|
|
unsigned Arg = getRegForValue(ArgValue);
|
|
if (Arg == 0)
|
|
return false;
|
|
|
|
Args.push_back(ArgValue);
|
|
ArgRegs.push_back(Arg);
|
|
ArgVTs.push_back(ArgVT);
|
|
ArgFlags.push_back(Flags);
|
|
}
|
|
|
|
// Process the arguments.
|
|
SmallVector<unsigned, 8> RegArgs;
|
|
unsigned NumBytes;
|
|
|
|
if (!processCallArgs(Args, ArgRegs, ArgVTs, ArgFlags,
|
|
RegArgs, CC, NumBytes, IsVarArg))
|
|
return false;
|
|
|
|
MachineInstrBuilder MIB;
|
|
// FIXME: No handling for function pointers yet. This requires
|
|
// implementing the function descriptor (OPD) setup.
|
|
const GlobalValue *GV = dyn_cast<GlobalValue>(Callee);
|
|
if (!GV) {
|
|
// patchpoints are a special case; they always dispatch to a pointer value.
|
|
// However, we don't actually want to generate the indirect call sequence
|
|
// here (that will be generated, as necessary, during asm printing), and
|
|
// the call we generate here will be erased by FastISel::selectPatchpoint,
|
|
// so don't try very hard...
|
|
if (CLI.IsPatchPoint)
|
|
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::NOP));
|
|
else
|
|
return false;
|
|
} else {
|
|
// Build direct call with NOP for TOC restore.
|
|
// FIXME: We can and should optimize away the NOP for local calls.
|
|
MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(PPC::BL8_NOP));
|
|
// Add callee.
|
|
MIB.addGlobalAddress(GV);
|
|
}
|
|
|
|
// Add implicit physical register uses to the call.
|
|
for (unsigned II = 0, IE = RegArgs.size(); II != IE; ++II)
|
|
MIB.addReg(RegArgs[II], RegState::Implicit);
|
|
|
|
// Direct calls, in both the ELF V1 and V2 ABIs, need the TOC register live
|
|
// into the call.
|
|
PPCFuncInfo->setUsesTOCBasePtr();
|
|
MIB.addReg(PPC::X2, RegState::Implicit);
|
|
|
|
// Add a register mask with the call-preserved registers. Proper
|
|
// defs for return values will be added by setPhysRegsDeadExcept().
|
|
MIB.addRegMask(TRI.getCallPreservedMask(*FuncInfo.MF, CC));
|
|
|
|
CLI.Call = MIB;
|
|
|
|
// Finish off the call including any return values.
|
|
return finishCall(RetVT, CLI, NumBytes);
|
|
}
|
|
|
|
// Attempt to fast-select a return instruction.
|
|
bool PPCFastISel::SelectRet(const Instruction *I) {
|
|
|
|
if (!FuncInfo.CanLowerReturn)
|
|
return false;
|
|
|
|
const ReturnInst *Ret = cast<ReturnInst>(I);
|
|
const Function &F = *I->getParent()->getParent();
|
|
|
|
// Build a list of return value registers.
|
|
SmallVector<unsigned, 4> RetRegs;
|
|
CallingConv::ID CC = F.getCallingConv();
|
|
|
|
if (Ret->getNumOperands() > 0) {
|
|
SmallVector<ISD::OutputArg, 4> Outs;
|
|
GetReturnInfo(F.getReturnType(), F.getAttributes(), Outs, TLI);
|
|
|
|
// Analyze operands of the call, assigning locations to each operand.
|
|
SmallVector<CCValAssign, 16> ValLocs;
|
|
CCState CCInfo(CC, F.isVarArg(), *FuncInfo.MF, ValLocs, *Context);
|
|
CCInfo.AnalyzeReturn(Outs, RetCC_PPC64_ELF_FIS);
|
|
const Value *RV = Ret->getOperand(0);
|
|
|
|
// FIXME: Only one output register for now.
|
|
if (ValLocs.size() > 1)
|
|
return false;
|
|
|
|
// Special case for returning a constant integer of any size.
|
|
// Materialize the constant as an i64 and copy it to the return
|
|
// register. We still need to worry about properly extending the sign. E.g:
|
|
// If the constant has only one bit, it means it is a boolean. Therefore
|
|
// we can't use PPCMaterializeInt because it extends the sign which will
|
|
// cause negations of the returned value to be incorrect as they are
|
|
// implemented as the flip of the least significant bit.
|
|
if (isa<ConstantInt>(*RV)) {
|
|
const Constant *C = cast<Constant>(RV);
|
|
|
|
CCValAssign &VA = ValLocs[0];
|
|
|
|
unsigned RetReg = VA.getLocReg();
|
|
unsigned SrcReg = PPCMaterializeInt(C, MVT::i64,
|
|
VA.getLocInfo() == CCValAssign::SExt);
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(TargetOpcode::COPY), RetReg).addReg(SrcReg);
|
|
|
|
RetRegs.push_back(RetReg);
|
|
|
|
} else {
|
|
unsigned Reg = getRegForValue(RV);
|
|
|
|
if (Reg == 0)
|
|
return false;
|
|
|
|
// Copy the result values into the output registers.
|
|
for (unsigned i = 0; i < ValLocs.size(); ++i) {
|
|
|
|
CCValAssign &VA = ValLocs[i];
|
|
assert(VA.isRegLoc() && "Can only return in registers!");
|
|
RetRegs.push_back(VA.getLocReg());
|
|
unsigned SrcReg = Reg + VA.getValNo();
|
|
|
|
EVT RVEVT = TLI.getValueType(RV->getType());
|
|
if (!RVEVT.isSimple())
|
|
return false;
|
|
MVT RVVT = RVEVT.getSimpleVT();
|
|
MVT DestVT = VA.getLocVT();
|
|
|
|
if (RVVT != DestVT && RVVT != MVT::i8 &&
|
|
RVVT != MVT::i16 && RVVT != MVT::i32)
|
|
return false;
|
|
|
|
if (RVVT != DestVT) {
|
|
switch (VA.getLocInfo()) {
|
|
default:
|
|
llvm_unreachable("Unknown loc info!");
|
|
case CCValAssign::Full:
|
|
llvm_unreachable("Full value assign but types don't match?");
|
|
case CCValAssign::AExt:
|
|
case CCValAssign::ZExt: {
|
|
const TargetRegisterClass *RC =
|
|
(DestVT == MVT::i64) ? &PPC::G8RCRegClass : &PPC::GPRCRegClass;
|
|
unsigned TmpReg = createResultReg(RC);
|
|
if (!PPCEmitIntExt(RVVT, SrcReg, DestVT, TmpReg, true))
|
|
return false;
|
|
SrcReg = TmpReg;
|
|
break;
|
|
}
|
|
case CCValAssign::SExt: {
|
|
const TargetRegisterClass *RC =
|
|
(DestVT == MVT::i64) ? &PPC::G8RCRegClass : &PPC::GPRCRegClass;
|
|
unsigned TmpReg = createResultReg(RC);
|
|
if (!PPCEmitIntExt(RVVT, SrcReg, DestVT, TmpReg, false))
|
|
return false;
|
|
SrcReg = TmpReg;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(TargetOpcode::COPY), RetRegs[i])
|
|
.addReg(SrcReg);
|
|
}
|
|
}
|
|
}
|
|
|
|
MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(PPC::BLR8));
|
|
|
|
for (unsigned i = 0, e = RetRegs.size(); i != e; ++i)
|
|
MIB.addReg(RetRegs[i], RegState::Implicit);
|
|
|
|
return true;
|
|
}
|
|
|
|
// Attempt to emit an integer extend of SrcReg into DestReg. Both
|
|
// signed and zero extensions are supported. Return false if we
|
|
// can't handle it.
|
|
bool PPCFastISel::PPCEmitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
|
|
unsigned DestReg, bool IsZExt) {
|
|
if (DestVT != MVT::i32 && DestVT != MVT::i64)
|
|
return false;
|
|
if (SrcVT != MVT::i8 && SrcVT != MVT::i16 && SrcVT != MVT::i32)
|
|
return false;
|
|
|
|
// Signed extensions use EXTSB, EXTSH, EXTSW.
|
|
if (!IsZExt) {
|
|
unsigned Opc;
|
|
if (SrcVT == MVT::i8)
|
|
Opc = (DestVT == MVT::i32) ? PPC::EXTSB : PPC::EXTSB8_32_64;
|
|
else if (SrcVT == MVT::i16)
|
|
Opc = (DestVT == MVT::i32) ? PPC::EXTSH : PPC::EXTSH8_32_64;
|
|
else {
|
|
assert(DestVT == MVT::i64 && "Signed extend from i32 to i32??");
|
|
Opc = PPC::EXTSW_32_64;
|
|
}
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), DestReg)
|
|
.addReg(SrcReg);
|
|
|
|
// Unsigned 32-bit extensions use RLWINM.
|
|
} else if (DestVT == MVT::i32) {
|
|
unsigned MB;
|
|
if (SrcVT == MVT::i8)
|
|
MB = 24;
|
|
else {
|
|
assert(SrcVT == MVT::i16 && "Unsigned extend from i32 to i32??");
|
|
MB = 16;
|
|
}
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::RLWINM),
|
|
DestReg)
|
|
.addReg(SrcReg).addImm(/*SH=*/0).addImm(MB).addImm(/*ME=*/31);
|
|
|
|
// Unsigned 64-bit extensions use RLDICL (with a 32-bit source).
|
|
} else {
|
|
unsigned MB;
|
|
if (SrcVT == MVT::i8)
|
|
MB = 56;
|
|
else if (SrcVT == MVT::i16)
|
|
MB = 48;
|
|
else
|
|
MB = 32;
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(PPC::RLDICL_32_64), DestReg)
|
|
.addReg(SrcReg).addImm(/*SH=*/0).addImm(MB);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select an indirect branch instruction.
|
|
bool PPCFastISel::SelectIndirectBr(const Instruction *I) {
|
|
unsigned AddrReg = getRegForValue(I->getOperand(0));
|
|
if (AddrReg == 0)
|
|
return false;
|
|
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::MTCTR8))
|
|
.addReg(AddrReg);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::BCTR8));
|
|
|
|
const IndirectBrInst *IB = cast<IndirectBrInst>(I);
|
|
for (unsigned i = 0, e = IB->getNumSuccessors(); i != e; ++i)
|
|
FuncInfo.MBB->addSuccessor(FuncInfo.MBBMap[IB->getSuccessor(i)]);
|
|
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select an integer truncate instruction.
|
|
bool PPCFastISel::SelectTrunc(const Instruction *I) {
|
|
Value *Src = I->getOperand(0);
|
|
EVT SrcVT = TLI.getValueType(Src->getType(), true);
|
|
EVT DestVT = TLI.getValueType(I->getType(), true);
|
|
|
|
if (SrcVT != MVT::i64 && SrcVT != MVT::i32 && SrcVT != MVT::i16)
|
|
return false;
|
|
|
|
if (DestVT != MVT::i32 && DestVT != MVT::i16 && DestVT != MVT::i8)
|
|
return false;
|
|
|
|
unsigned SrcReg = getRegForValue(Src);
|
|
if (!SrcReg)
|
|
return false;
|
|
|
|
// The only interesting case is when we need to switch register classes.
|
|
if (SrcVT == MVT::i64) {
|
|
unsigned ResultReg = createResultReg(&PPC::GPRCRegClass);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(TargetOpcode::COPY),
|
|
ResultReg).addReg(SrcReg, 0, PPC::sub_32);
|
|
SrcReg = ResultReg;
|
|
}
|
|
|
|
updateValueMap(I, SrcReg);
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select an integer extend instruction.
|
|
bool PPCFastISel::SelectIntExt(const Instruction *I) {
|
|
Type *DestTy = I->getType();
|
|
Value *Src = I->getOperand(0);
|
|
Type *SrcTy = Src->getType();
|
|
|
|
bool IsZExt = isa<ZExtInst>(I);
|
|
unsigned SrcReg = getRegForValue(Src);
|
|
if (!SrcReg) return false;
|
|
|
|
EVT SrcEVT, DestEVT;
|
|
SrcEVT = TLI.getValueType(SrcTy, true);
|
|
DestEVT = TLI.getValueType(DestTy, true);
|
|
if (!SrcEVT.isSimple())
|
|
return false;
|
|
if (!DestEVT.isSimple())
|
|
return false;
|
|
|
|
MVT SrcVT = SrcEVT.getSimpleVT();
|
|
MVT DestVT = DestEVT.getSimpleVT();
|
|
|
|
// If we know the register class needed for the result of this
|
|
// instruction, use it. Otherwise pick the register class of the
|
|
// correct size that does not contain X0/R0, since we don't know
|
|
// whether downstream uses permit that assignment.
|
|
unsigned AssignedReg = FuncInfo.ValueMap[I];
|
|
const TargetRegisterClass *RC =
|
|
(AssignedReg ? MRI.getRegClass(AssignedReg) :
|
|
(DestVT == MVT::i64 ? &PPC::G8RC_and_G8RC_NOX0RegClass :
|
|
&PPC::GPRC_and_GPRC_NOR0RegClass));
|
|
unsigned ResultReg = createResultReg(RC);
|
|
|
|
if (!PPCEmitIntExt(SrcVT, SrcReg, DestVT, ResultReg, IsZExt))
|
|
return false;
|
|
|
|
updateValueMap(I, ResultReg);
|
|
return true;
|
|
}
|
|
|
|
// Attempt to fast-select an instruction that wasn't handled by
|
|
// the table-generated machinery.
|
|
bool PPCFastISel::fastSelectInstruction(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::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::Call:
|
|
return selectCall(I);
|
|
case Instruction::Ret:
|
|
return SelectRet(I);
|
|
case Instruction::Trunc:
|
|
return SelectTrunc(I);
|
|
case Instruction::ZExt:
|
|
case Instruction::SExt:
|
|
return SelectIntExt(I);
|
|
// Here add other flavors of Instruction::XXX that automated
|
|
// cases don't catch. For example, switches are terminators
|
|
// that aren't yet handled.
|
|
default:
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// Materialize a floating-point constant into a register, and return
|
|
// the register number (or zero if we failed to handle it).
|
|
unsigned PPCFastISel::PPCMaterializeFP(const ConstantFP *CFP, MVT VT) {
|
|
// No plans to handle long double here.
|
|
if (VT != MVT::f32 && VT != MVT::f64)
|
|
return 0;
|
|
|
|
// All FP constants are loaded from the constant pool.
|
|
unsigned Align = DL.getPrefTypeAlignment(CFP->getType());
|
|
assert(Align > 0 && "Unexpectedly missing alignment information!");
|
|
unsigned Idx = MCP.getConstantPoolIndex(cast<Constant>(CFP), Align);
|
|
unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
|
|
CodeModel::Model CModel = TM.getCodeModel();
|
|
|
|
MachineMemOperand *MMO =
|
|
FuncInfo.MF->getMachineMemOperand(
|
|
MachinePointerInfo::getConstantPool(), MachineMemOperand::MOLoad,
|
|
(VT == MVT::f32) ? 4 : 8, Align);
|
|
|
|
unsigned Opc = (VT == MVT::f32) ? PPC::LFS : PPC::LFD;
|
|
unsigned TmpReg = createResultReg(&PPC::G8RC_and_G8RC_NOX0RegClass);
|
|
|
|
PPCFuncInfo->setUsesTOCBasePtr();
|
|
// For small code model, generate a LF[SD](0, LDtocCPT(Idx, X2)).
|
|
if (CModel == CodeModel::Small || CModel == CodeModel::JITDefault) {
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::LDtocCPT),
|
|
TmpReg)
|
|
.addConstantPoolIndex(Idx).addReg(PPC::X2);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), DestReg)
|
|
.addImm(0).addReg(TmpReg).addMemOperand(MMO);
|
|
} else {
|
|
// Otherwise we generate LF[SD](Idx[lo], ADDIStocHA(X2, Idx)).
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::ADDIStocHA),
|
|
TmpReg).addReg(PPC::X2).addConstantPoolIndex(Idx);
|
|
// But for large code model, we must generate a LDtocL followed
|
|
// by the LF[SD].
|
|
if (CModel == CodeModel::Large) {
|
|
unsigned TmpReg2 = createResultReg(&PPC::G8RC_and_G8RC_NOX0RegClass);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::LDtocL),
|
|
TmpReg2).addConstantPoolIndex(Idx).addReg(TmpReg);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), DestReg)
|
|
.addImm(0).addReg(TmpReg2);
|
|
} else
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), DestReg)
|
|
.addConstantPoolIndex(Idx, 0, PPCII::MO_TOC_LO)
|
|
.addReg(TmpReg)
|
|
.addMemOperand(MMO);
|
|
}
|
|
|
|
return DestReg;
|
|
}
|
|
|
|
// Materialize the address of a global value into a register, and return
|
|
// the register number (or zero if we failed to handle it).
|
|
unsigned PPCFastISel::PPCMaterializeGV(const GlobalValue *GV, MVT VT) {
|
|
assert(VT == MVT::i64 && "Non-address!");
|
|
const TargetRegisterClass *RC = &PPC::G8RC_and_G8RC_NOX0RegClass;
|
|
unsigned DestReg = createResultReg(RC);
|
|
|
|
// Global values may be plain old object addresses, TLS object
|
|
// addresses, constant pool entries, or jump tables. How we generate
|
|
// code for these may depend on small, medium, or large code model.
|
|
CodeModel::Model CModel = TM.getCodeModel();
|
|
|
|
// FIXME: Jump tables are not yet required because fast-isel doesn't
|
|
// handle switches; if that changes, we need them as well. For now,
|
|
// what follows assumes everything's a generic (or TLS) global address.
|
|
|
|
// FIXME: We don't yet handle the complexity of TLS.
|
|
if (GV->isThreadLocal())
|
|
return 0;
|
|
|
|
PPCFuncInfo->setUsesTOCBasePtr();
|
|
// For small code model, generate a simple TOC load.
|
|
if (CModel == CodeModel::Small || CModel == CodeModel::JITDefault)
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::LDtoc),
|
|
DestReg)
|
|
.addGlobalAddress(GV)
|
|
.addReg(PPC::X2);
|
|
else {
|
|
// If the address is an externally defined symbol, a symbol with common
|
|
// or externally available linkage, a non-local function address, or a
|
|
// jump table address (not yet needed), or if we are generating code
|
|
// for large code model, we generate:
|
|
// LDtocL(GV, ADDIStocHA(%X2, GV))
|
|
// Otherwise we generate:
|
|
// ADDItocL(ADDIStocHA(%X2, GV), GV)
|
|
// Either way, start with the ADDIStocHA:
|
|
unsigned HighPartReg = createResultReg(RC);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::ADDIStocHA),
|
|
HighPartReg).addReg(PPC::X2).addGlobalAddress(GV);
|
|
|
|
// If/when switches are implemented, jump tables should be handled
|
|
// on the "if" path here.
|
|
if (CModel == CodeModel::Large ||
|
|
(GV->getType()->getElementType()->isFunctionTy() &&
|
|
(GV->isDeclaration() || GV->isWeakForLinker())) ||
|
|
GV->isDeclaration() || GV->hasCommonLinkage() ||
|
|
GV->hasAvailableExternallyLinkage())
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::LDtocL),
|
|
DestReg).addGlobalAddress(GV).addReg(HighPartReg);
|
|
else
|
|
// Otherwise generate the ADDItocL.
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::ADDItocL),
|
|
DestReg).addReg(HighPartReg).addGlobalAddress(GV);
|
|
}
|
|
|
|
return DestReg;
|
|
}
|
|
|
|
// Materialize a 32-bit integer constant into a register, and return
|
|
// the register number (or zero if we failed to handle it).
|
|
unsigned PPCFastISel::PPCMaterialize32BitInt(int64_t Imm,
|
|
const TargetRegisterClass *RC) {
|
|
unsigned Lo = Imm & 0xFFFF;
|
|
unsigned Hi = (Imm >> 16) & 0xFFFF;
|
|
|
|
unsigned ResultReg = createResultReg(RC);
|
|
bool IsGPRC = RC->hasSuperClassEq(&PPC::GPRCRegClass);
|
|
|
|
if (isInt<16>(Imm))
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(IsGPRC ? PPC::LI : PPC::LI8), ResultReg)
|
|
.addImm(Imm);
|
|
else if (Lo) {
|
|
// Both Lo and Hi have nonzero bits.
|
|
unsigned TmpReg = createResultReg(RC);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(IsGPRC ? PPC::LIS : PPC::LIS8), TmpReg)
|
|
.addImm(Hi);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(IsGPRC ? PPC::ORI : PPC::ORI8), ResultReg)
|
|
.addReg(TmpReg).addImm(Lo);
|
|
} else
|
|
// Just Hi bits.
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(IsGPRC ? PPC::LIS : PPC::LIS8), ResultReg)
|
|
.addImm(Hi);
|
|
|
|
return ResultReg;
|
|
}
|
|
|
|
// Materialize a 64-bit integer constant into a register, and return
|
|
// the register number (or zero if we failed to handle it).
|
|
unsigned PPCFastISel::PPCMaterialize64BitInt(int64_t Imm,
|
|
const TargetRegisterClass *RC) {
|
|
unsigned Remainder = 0;
|
|
unsigned Shift = 0;
|
|
|
|
// If the value doesn't fit in 32 bits, see if we can shift it
|
|
// so that it fits in 32 bits.
|
|
if (!isInt<32>(Imm)) {
|
|
Shift = countTrailingZeros<uint64_t>(Imm);
|
|
int64_t ImmSh = static_cast<uint64_t>(Imm) >> Shift;
|
|
|
|
if (isInt<32>(ImmSh))
|
|
Imm = ImmSh;
|
|
else {
|
|
Remainder = Imm;
|
|
Shift = 32;
|
|
Imm >>= 32;
|
|
}
|
|
}
|
|
|
|
// Handle the high-order 32 bits (if shifted) or the whole 32 bits
|
|
// (if not shifted).
|
|
unsigned TmpReg1 = PPCMaterialize32BitInt(Imm, RC);
|
|
if (!Shift)
|
|
return TmpReg1;
|
|
|
|
// If upper 32 bits were not zero, we've built them and need to shift
|
|
// them into place.
|
|
unsigned TmpReg2;
|
|
if (Imm) {
|
|
TmpReg2 = createResultReg(RC);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::RLDICR),
|
|
TmpReg2).addReg(TmpReg1).addImm(Shift).addImm(63 - Shift);
|
|
} else
|
|
TmpReg2 = TmpReg1;
|
|
|
|
unsigned TmpReg3, Hi, Lo;
|
|
if ((Hi = (Remainder >> 16) & 0xFFFF)) {
|
|
TmpReg3 = createResultReg(RC);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::ORIS8),
|
|
TmpReg3).addReg(TmpReg2).addImm(Hi);
|
|
} else
|
|
TmpReg3 = TmpReg2;
|
|
|
|
if ((Lo = Remainder & 0xFFFF)) {
|
|
unsigned ResultReg = createResultReg(RC);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::ORI8),
|
|
ResultReg).addReg(TmpReg3).addImm(Lo);
|
|
return ResultReg;
|
|
}
|
|
|
|
return TmpReg3;
|
|
}
|
|
|
|
|
|
// Materialize an integer constant into a register, and return
|
|
// the register number (or zero if we failed to handle it).
|
|
unsigned PPCFastISel::PPCMaterializeInt(const Constant *C, MVT VT,
|
|
bool UseSExt) {
|
|
// If we're using CR bit registers for i1 values, handle that as a special
|
|
// case first.
|
|
if (VT == MVT::i1 && PPCSubTarget->useCRBits()) {
|
|
const ConstantInt *CI = cast<ConstantInt>(C);
|
|
unsigned ImmReg = createResultReg(&PPC::CRBITRCRegClass);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(CI->isZero() ? PPC::CRUNSET : PPC::CRSET), ImmReg);
|
|
return ImmReg;
|
|
}
|
|
|
|
if (VT != MVT::i64 && VT != MVT::i32 && VT != MVT::i16 &&
|
|
VT != MVT::i8 && VT != MVT::i1)
|
|
return 0;
|
|
|
|
const TargetRegisterClass *RC = ((VT == MVT::i64) ? &PPC::G8RCRegClass :
|
|
&PPC::GPRCRegClass);
|
|
|
|
// If the constant is in range, use a load-immediate.
|
|
const ConstantInt *CI = cast<ConstantInt>(C);
|
|
if (isInt<16>(CI->getSExtValue())) {
|
|
unsigned Opc = (VT == MVT::i64) ? PPC::LI8 : PPC::LI;
|
|
unsigned ImmReg = createResultReg(RC);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ImmReg)
|
|
.addImm( (UseSExt) ? CI->getSExtValue() : CI->getZExtValue() );
|
|
return ImmReg;
|
|
}
|
|
|
|
// Construct the constant piecewise.
|
|
int64_t Imm = CI->getZExtValue();
|
|
|
|
if (VT == MVT::i64)
|
|
return PPCMaterialize64BitInt(Imm, RC);
|
|
else if (VT == MVT::i32)
|
|
return PPCMaterialize32BitInt(Imm, RC);
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Materialize a constant into a register, and return the register
|
|
// number (or zero if we failed to handle it).
|
|
unsigned PPCFastISel::fastMaterializeConstant(const Constant *C) {
|
|
EVT CEVT = TLI.getValueType(C->getType(), true);
|
|
|
|
// Only handle simple types.
|
|
if (!CEVT.isSimple()) return 0;
|
|
MVT VT = CEVT.getSimpleVT();
|
|
|
|
if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C))
|
|
return PPCMaterializeFP(CFP, VT);
|
|
else if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
|
|
return PPCMaterializeGV(GV, VT);
|
|
else if (isa<ConstantInt>(C))
|
|
return PPCMaterializeInt(C, VT, VT != MVT::i1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Materialize the address created by an alloca into a register, and
|
|
// return the register number (or zero if we failed to handle it).
|
|
unsigned PPCFastISel::fastMaterializeAlloca(const AllocaInst *AI) {
|
|
// Don't handle dynamic allocas.
|
|
if (!FuncInfo.StaticAllocaMap.count(AI)) return 0;
|
|
|
|
MVT VT;
|
|
if (!isLoadTypeLegal(AI->getType(), VT)) return 0;
|
|
|
|
DenseMap<const AllocaInst*, int>::iterator SI =
|
|
FuncInfo.StaticAllocaMap.find(AI);
|
|
|
|
if (SI != FuncInfo.StaticAllocaMap.end()) {
|
|
unsigned ResultReg = createResultReg(&PPC::G8RC_and_G8RC_NOX0RegClass);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(PPC::ADDI8),
|
|
ResultReg).addFrameIndex(SI->second).addImm(0);
|
|
return ResultReg;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Fold loads into extends when possible.
|
|
// FIXME: We can have multiple redundant extend/trunc instructions
|
|
// following a load. The folding only picks up one. Extend this
|
|
// to check subsequent instructions for the same pattern and remove
|
|
// them. Thus ResultReg should be the def reg for the last redundant
|
|
// instruction in a chain, and all intervening instructions can be
|
|
// removed from parent. Change test/CodeGen/PowerPC/fast-isel-fold.ll
|
|
// to add ELF64-NOT: rldicl to the appropriate tests when this works.
|
|
bool PPCFastISel::tryToFoldLoadIntoMI(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.
|
|
bool IsZExt = false;
|
|
switch(MI->getOpcode()) {
|
|
default:
|
|
return false;
|
|
|
|
case PPC::RLDICL:
|
|
case PPC::RLDICL_32_64: {
|
|
IsZExt = true;
|
|
unsigned MB = MI->getOperand(3).getImm();
|
|
if ((VT == MVT::i8 && MB <= 56) ||
|
|
(VT == MVT::i16 && MB <= 48) ||
|
|
(VT == MVT::i32 && MB <= 32))
|
|
break;
|
|
return false;
|
|
}
|
|
|
|
case PPC::RLWINM:
|
|
case PPC::RLWINM8: {
|
|
IsZExt = true;
|
|
unsigned MB = MI->getOperand(3).getImm();
|
|
if ((VT == MVT::i8 && MB <= 24) ||
|
|
(VT == MVT::i16 && MB <= 16))
|
|
break;
|
|
return false;
|
|
}
|
|
|
|
case PPC::EXTSB:
|
|
case PPC::EXTSB8:
|
|
case PPC::EXTSB8_32_64:
|
|
/* There is no sign-extending load-byte instruction. */
|
|
return false;
|
|
|
|
case PPC::EXTSH:
|
|
case PPC::EXTSH8:
|
|
case PPC::EXTSH8_32_64: {
|
|
if (VT != MVT::i16 && VT != MVT::i8)
|
|
return false;
|
|
break;
|
|
}
|
|
|
|
case PPC::EXTSW:
|
|
case PPC::EXTSW_32_64: {
|
|
if (VT != MVT::i32 && VT != MVT::i16 && VT != MVT::i8)
|
|
return false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// See if we can handle this address.
|
|
Address Addr;
|
|
if (!PPCComputeAddress(LI->getOperand(0), Addr))
|
|
return false;
|
|
|
|
unsigned ResultReg = MI->getOperand(0).getReg();
|
|
|
|
if (!PPCEmitLoad(VT, ResultReg, Addr, nullptr, IsZExt))
|
|
return false;
|
|
|
|
MI->eraseFromParent();
|
|
return true;
|
|
}
|
|
|
|
// Attempt to lower call arguments in a faster way than done by
|
|
// the selection DAG code.
|
|
bool PPCFastISel::fastLowerArguments() {
|
|
// Defer to normal argument lowering for now. It's reasonably
|
|
// efficient. Consider doing something like ARM to handle the
|
|
// case where all args fit in registers, no varargs, no float
|
|
// or vector args.
|
|
return false;
|
|
}
|
|
|
|
// Handle materializing integer constants into a register. This is not
|
|
// automatically generated for PowerPC, so must be explicitly created here.
|
|
unsigned PPCFastISel::fastEmit_i(MVT Ty, MVT VT, unsigned Opc, uint64_t Imm) {
|
|
|
|
if (Opc != ISD::Constant)
|
|
return 0;
|
|
|
|
// If we're using CR bit registers for i1 values, handle that as a special
|
|
// case first.
|
|
if (VT == MVT::i1 && PPCSubTarget->useCRBits()) {
|
|
unsigned ImmReg = createResultReg(&PPC::CRBITRCRegClass);
|
|
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
|
|
TII.get(Imm == 0 ? PPC::CRUNSET : PPC::CRSET), ImmReg);
|
|
return ImmReg;
|
|
}
|
|
|
|
if (VT != MVT::i64 && VT != MVT::i32 && VT != MVT::i16 &&
|
|
VT != MVT::i8 && VT != MVT::i1)
|
|
return 0;
|
|
|
|
const TargetRegisterClass *RC = ((VT == MVT::i64) ? &PPC::G8RCRegClass :
|
|
&PPC::GPRCRegClass);
|
|
if (VT == MVT::i64)
|
|
return PPCMaterialize64BitInt(Imm, RC);
|
|
else
|
|
return PPCMaterialize32BitInt(Imm, RC);
|
|
}
|
|
|
|
// Override for ADDI and ADDI8 to set the correct register class
|
|
// on RHS operand 0. The automatic infrastructure naively assumes
|
|
// GPRC for i32 and G8RC for i64; the concept of "no R0" is lost
|
|
// for these cases. At the moment, none of the other automatically
|
|
// generated RI instructions require special treatment. However, once
|
|
// SelectSelect is implemented, "isel" requires similar handling.
|
|
//
|
|
// Also be conservative about the output register class. Avoid
|
|
// assigning R0 or X0 to the output register for GPRC and G8RC
|
|
// register classes, as any such result could be used in ADDI, etc.,
|
|
// where those regs have another meaning.
|
|
unsigned PPCFastISel::fastEmitInst_ri(unsigned MachineInstOpcode,
|
|
const TargetRegisterClass *RC,
|
|
unsigned Op0, bool Op0IsKill,
|
|
uint64_t Imm) {
|
|
if (MachineInstOpcode == PPC::ADDI)
|
|
MRI.setRegClass(Op0, &PPC::GPRC_and_GPRC_NOR0RegClass);
|
|
else if (MachineInstOpcode == PPC::ADDI8)
|
|
MRI.setRegClass(Op0, &PPC::G8RC_and_G8RC_NOX0RegClass);
|
|
|
|
const TargetRegisterClass *UseRC =
|
|
(RC == &PPC::GPRCRegClass ? &PPC::GPRC_and_GPRC_NOR0RegClass :
|
|
(RC == &PPC::G8RCRegClass ? &PPC::G8RC_and_G8RC_NOX0RegClass : RC));
|
|
|
|
return FastISel::fastEmitInst_ri(MachineInstOpcode, UseRC,
|
|
Op0, Op0IsKill, Imm);
|
|
}
|
|
|
|
// Override for instructions with one register operand to avoid use of
|
|
// R0/X0. The automatic infrastructure isn't aware of the context so
|
|
// we must be conservative.
|
|
unsigned PPCFastISel::fastEmitInst_r(unsigned MachineInstOpcode,
|
|
const TargetRegisterClass* RC,
|
|
unsigned Op0, bool Op0IsKill) {
|
|
const TargetRegisterClass *UseRC =
|
|
(RC == &PPC::GPRCRegClass ? &PPC::GPRC_and_GPRC_NOR0RegClass :
|
|
(RC == &PPC::G8RCRegClass ? &PPC::G8RC_and_G8RC_NOX0RegClass : RC));
|
|
|
|
return FastISel::fastEmitInst_r(MachineInstOpcode, UseRC, Op0, Op0IsKill);
|
|
}
|
|
|
|
// Override for instructions with two register operands to avoid use
|
|
// of R0/X0. The automatic infrastructure isn't aware of the context
|
|
// so we must be conservative.
|
|
unsigned PPCFastISel::fastEmitInst_rr(unsigned MachineInstOpcode,
|
|
const TargetRegisterClass* RC,
|
|
unsigned Op0, bool Op0IsKill,
|
|
unsigned Op1, bool Op1IsKill) {
|
|
const TargetRegisterClass *UseRC =
|
|
(RC == &PPC::GPRCRegClass ? &PPC::GPRC_and_GPRC_NOR0RegClass :
|
|
(RC == &PPC::G8RCRegClass ? &PPC::G8RC_and_G8RC_NOX0RegClass : RC));
|
|
|
|
return FastISel::fastEmitInst_rr(MachineInstOpcode, UseRC, Op0, Op0IsKill,
|
|
Op1, Op1IsKill);
|
|
}
|
|
|
|
namespace llvm {
|
|
// Create the fast instruction selector for PowerPC64 ELF.
|
|
FastISel *PPC::createFastISel(FunctionLoweringInfo &FuncInfo,
|
|
const TargetLibraryInfo *LibInfo) {
|
|
// Only available on 64-bit ELF for now.
|
|
const PPCSubtarget &Subtarget = FuncInfo.MF->getSubtarget<PPCSubtarget>();
|
|
if (Subtarget.isPPC64() && Subtarget.isSVR4ABI())
|
|
return new PPCFastISel(FuncInfo, LibInfo);
|
|
return nullptr;
|
|
}
|
|
}
|