X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FX86%2FX86ISelSimple.cpp;h=a8ed6f69c0e6d74e329d4d51a954a47ab38ce472;hb=7d25589ee19747720a6cdb045ae442332f90bbcf;hp=d27041faa97f5c5c7ff5ed13bd9df60e52005864;hpb=333b2fa56063db4026809f9afaa403bf83e7a5b4;p=oota-llvm.git diff --git a/lib/Target/X86/X86ISelSimple.cpp b/lib/Target/X86/X86ISelSimple.cpp index d27041faa97..a8ed6f69c0e 100644 --- a/lib/Target/X86/X86ISelSimple.cpp +++ b/lib/Target/X86/X86ISelSimple.cpp @@ -29,16 +29,28 @@ using namespace MOTy; // Get Use, Def, UseAndDef /// BMI - A special BuildMI variant that takes an iterator to insert the /// instruction at as well as a basic block. -inline static MachineInstrBuilder BMI(MachineBasicBlock *BB, +/// this is the version for when you have a destination register in mind. +inline static MachineInstrBuilder BMI(MachineBasicBlock *MBB, MachineBasicBlock::iterator &I, MachineOpCode Opcode, unsigned NumOperands, unsigned DestReg) { MachineInstr *MI = new MachineInstr(Opcode, NumOperands+1, true, true); - I = ++BB->insert(I, MI); + I = ++MBB->insert(I, MI); return MachineInstrBuilder(MI).addReg(DestReg, MOTy::Def); } +/// BMI - A special BuildMI variant that takes an iterator to insert the +/// instruction at as well as a basic block. +inline static MachineInstrBuilder BMI(MachineBasicBlock *MBB, + MachineBasicBlock::iterator &I, + MachineOpCode Opcode, + unsigned NumOperands) { + MachineInstr *MI = new MachineInstr(Opcode, NumOperands, true, true); + I = ++MBB->insert(I, MI); + return MachineInstrBuilder(MI); +} + namespace { struct ISel : public FunctionPass, InstVisitor { @@ -107,7 +119,9 @@ namespace { void visitAdd(BinaryOperator &B) { visitSimpleBinary(B, 0); } void visitSub(BinaryOperator &B) { visitSimpleBinary(B, 1); } void doMultiply(unsigned destReg, const Type *resultType, - unsigned op0Reg, unsigned op1Reg); + unsigned op0Reg, unsigned op1Reg, + MachineBasicBlock *MBB, + MachineBasicBlock::iterator &MBBI); void visitMul(BinaryOperator &B); void visitDiv(BinaryOperator &B) { visitDivRem(B); } @@ -152,7 +166,7 @@ namespace { // emitGEPOperation - Common code shared between visitGetElementPtrInst and // constant expression GEP support. // - void emitGEPOperation(MachineBasicBlock *BB, MachineBasicBlock::iterator IP, + void emitGEPOperation(MachineBasicBlock *BB, MachineBasicBlock::iterator&IP, Value *Src, User::op_iterator IdxBegin, User::op_iterator IdxEnd, unsigned TargetReg); @@ -161,7 +175,7 @@ namespace { /// void copyConstantToRegister(Constant *C, unsigned Reg, MachineBasicBlock *MBB, - MachineBasicBlock::iterator MBBI); + MachineBasicBlock::iterator &MBBI); /// makeAnotherReg - This method returns the next register number /// we haven't yet used. @@ -176,15 +190,13 @@ namespace { /// every time it is queried. /// unsigned getReg(Value &V) { return getReg(&V); } // Allow references - unsigned getReg(Value *V, MachineBasicBlock *BB = 0) { - MachineBasicBlock::iterator IPt; - if (BB == 0) { // Should we just append to the end of the current bb? - BB = this->BB; - IPt = BB->end(); - } else { // Otherwise, insert before the branch or ret instr... - IPt = BB->end()-1; - } - + unsigned getReg(Value *V) { + // Just append to the end of the current bb. + MachineBasicBlock::iterator It = BB->end(); + return getReg(V, BB, It); + } + unsigned getReg(Value *V, MachineBasicBlock *MBB, + MachineBasicBlock::iterator &IPt) { unsigned &Reg = RegMap[V]; if (Reg == 0) { Reg = makeAnotherReg(V->getType()); @@ -198,7 +210,7 @@ namespace { copyConstantToRegister(C, Reg, BB, IPt); } else if (GlobalValue *GV = dyn_cast(V)) { // Move the address of the global into the register - BMI(BB, IPt, X86::MOVir32, 1, Reg).addReg(GV); + BMI(MBB, IPt, X86::MOVir32, 1, Reg).addReg(GV); } else if (Argument *A = dyn_cast(V)) { // Find the position of the argument in the argument list. const Function *f = F->getFunction (); @@ -219,7 +231,7 @@ namespace { assert (argPos != -1 && "Argument not found in current function's argument list"); // Load it out of the stack frame at EBP + 4*argPos. - addRegOffset(BMI(BB, IPt, X86::MOVmr32, 4, Reg), X86::EBP, 4*argPos); + addRegOffset(BMI(MBB, IPt, X86::MOVmr32, 4, Reg), X86::EBP, 4*argPos); } return Reg; @@ -264,8 +276,8 @@ static inline TypeClass getClass(const Type *Ty) { /// specified constant into the specified register. /// void ISel::copyConstantToRegister(Constant *C, unsigned R, - MachineBasicBlock *BB, - MachineBasicBlock::iterator IP) { + MachineBasicBlock *MBB, + MachineBasicBlock::iterator &IP) { if (ConstantExpr *CE = dyn_cast(C)) { if (CE->getOpcode() == Instruction::GetElementPtr) { emitGEPOperation(BB, IP, CE->getOperand(0), @@ -287,17 +299,17 @@ void ISel::copyConstantToRegister(Constant *C, unsigned R, if (C->getType()->isSigned()) { ConstantSInt *CSI = cast(C); - BMI(BB, IP, IntegralOpcodeTab[Class], 1, R).addSImm(CSI->getValue()); + BMI(MBB, IP, IntegralOpcodeTab[Class], 1, R).addSImm(CSI->getValue()); } else { ConstantUInt *CUI = cast(C); - BMI(BB, IP, IntegralOpcodeTab[Class], 1, R).addZImm(CUI->getValue()); + BMI(MBB, IP, IntegralOpcodeTab[Class], 1, R).addZImm(CUI->getValue()); } - } else if (isa (C)) { + } else if (isa(C)) { // Copy zero (null pointer) to the register. - BMI(BB, IP, X86::MOVir32, 1, R).addZImm(0); + BMI(MBB, IP, X86::MOVir32, 1, R).addZImm(0); } else if (ConstantPointerRef *CPR = dyn_cast(C)) { - unsigned SrcReg = getReg(CPR->getValue()); - BMI(BB, IP, X86::MOVrr32, 1, R).addReg(SrcReg); + unsigned SrcReg = getReg(CPR->getValue(), BB, IP); + BMI(MBB, IP, X86::MOVrr32, 1, R).addReg(SrcReg); } else { std::cerr << "Offending constant: " << C << "\n"; assert(0 && "Type not handled yet!"); @@ -328,7 +340,9 @@ void ISel::SelectPHINodes() { // Get the incoming value into a virtual register. If it is not already // available in a virtual register, insert the computation code into // PredMBB - MI->addRegOperand(getReg(PN->getIncomingValue(i), PredMBB)); + MachineBasicBlock::iterator PI = PredMBB->end()-1; + MI->addRegOperand(getReg(PN->getIncomingValue(i), PredMBB, PI)); + // FIXME: Pass in the MachineBasicBlocks instead of the basic blocks... MI->addPCDispOperand(PN->getIncomingBlock(i)); // PredMBB @@ -636,7 +650,8 @@ void ISel::visitSimpleBinary(BinaryOperator &B, unsigned OperatorClass) { /// The type of the result should be given as resultType. void ISel::doMultiply(unsigned destReg, const Type *resultType, - unsigned op0Reg, unsigned op1Reg) + unsigned op0Reg, unsigned op1Reg, + MachineBasicBlock *MBB, MachineBasicBlock::iterator &MBBI) { unsigned Class = getClass (resultType); @@ -651,21 +666,23 @@ ISel::doMultiply(unsigned destReg, const Type *resultType, // Emit a MOV to put the first operand into the appropriately-sized // subreg of EAX. - BuildMI (BB, MovOpcode[Class], 1, Reg).addReg (op0Reg); + BMI(MBB, MBBI, MovOpcode[Class], 1, Reg).addReg (op0Reg); // Emit the appropriate multiply instruction. - BuildMI (BB, MulOpcode[Class], 1).addReg (op1Reg); + BMI(MBB, MBBI, MulOpcode[Class], 1).addReg (op1Reg); // Emit another MOV to put the result into the destination register. - BuildMI (BB, MovOpcode[Class], 1, destReg).addReg (Reg); + BMI(MBB, MBBI, MovOpcode[Class], 1, destReg).addReg (Reg); } /// visitMul - Multiplies are not simple binary operators because they must deal /// with the EAX register explicitly. /// void ISel::visitMul(BinaryOperator &I) { + MachineBasicBlock::iterator MBBI = BB->end(); doMultiply (getReg (I), I.getType (), - getReg (I.getOperand (0)), getReg (I.getOperand (1))); + getReg (I.getOperand (0)), getReg (I.getOperand (1)), + BB, MBBI); } @@ -837,7 +854,7 @@ ISel::visitCastInst (CastInst &CI) // 4) cast {int, uint, ptr} to {short, ushort} // cast {int, uint, ptr} to {sbyte, ubyte} // cast {short, ushort} to {sbyte, ubyte} - // + // 1) Implement casts to bool by using compare on the operand followed // by set if not zero on the result. if (targetType == Type::BoolTy) @@ -846,10 +863,11 @@ ISel::visitCastInst (CastInst &CI) BuildMI (BB, X86::SETNEr, 1, destReg); return; } + // 2) Implement casts between values of the same type class (as determined // by getClass) by using a register-to-register move. - unsigned int srcClass = getClass (sourceType); - unsigned int targClass = getClass (targetType); + unsigned srcClass = sourceType == Type::BoolTy ? cByte : getClass(sourceType); + unsigned targClass = getClass (targetType); static const unsigned regRegMove[] = { X86::MOVrr8, X86::MOVrr16, X86::MOVrr32 }; @@ -903,17 +921,18 @@ ISel::visitCastInst (CastInst &CI) void ISel::visitGetElementPtrInst (GetElementPtrInst &I) { - emitGEPOperation(BB, BB->end(), I.getOperand(0), + MachineBasicBlock::iterator MI = BB->end(); + emitGEPOperation(BB, MI, I.getOperand(0), I.op_begin()+1, I.op_end(), getReg(I)); } -void ISel::emitGEPOperation(MachineBasicBlock *BB, - MachineBasicBlock::iterator IP, +void ISel::emitGEPOperation(MachineBasicBlock *MBB, + MachineBasicBlock::iterator &IP, Value *Src, User::op_iterator IdxBegin, User::op_iterator IdxEnd, unsigned TargetReg) { const TargetData &TD = TM.getTargetData(); const Type *Ty = Src->getType(); - unsigned basePtrReg = getReg(Src); + unsigned basePtrReg = getReg(Src, BB, IP); // GEPs have zero or more indices; we must perform a struct access // or array access for each one. @@ -936,8 +955,8 @@ void ISel::emitGEPOperation(MachineBasicBlock *BB, unsigned memberOffset = TD.getStructLayout (StTy)->MemberOffsets[idxValue]; // Emit an ADD to add memberOffset to the basePtr. - BuildMI (BB, X86::ADDri32, 2, - nextBasePtrReg).addReg (basePtrReg).addZImm (memberOffset); + BMI(MBB, IP, X86::ADDri32, 2, + nextBasePtrReg).addReg (basePtrReg).addZImm (memberOffset); // The next type is the member of the structure selected by the // index. Ty = StTy->getElementTypes ()[idxValue]; @@ -955,20 +974,20 @@ void ISel::emitGEPOperation(MachineBasicBlock *BB, // elements in the array.) Ty = SqTy->getElementType (); unsigned elementSize = TD.getTypeSize (Ty); - unsigned elementSizeReg = makeAnotherReg(Type::UIntTy); - copyConstantToRegister(ConstantInt::get(typeOfSequentialTypeIndex, + unsigned elementSizeReg = makeAnotherReg(typeOfSequentialTypeIndex); + copyConstantToRegister(ConstantSInt::get(typeOfSequentialTypeIndex, elementSize), elementSizeReg, - BB, BB->end()); + BB, IP); - unsigned idxReg = getReg (idx); + unsigned idxReg = getReg(idx, BB, IP); // Emit a MUL to multiply the register holding the index by // elementSize, putting the result in memberOffsetReg. unsigned memberOffsetReg = makeAnotherReg(Type::UIntTy); doMultiply (memberOffsetReg, typeOfSequentialTypeIndex, - elementSizeReg, idxReg); + elementSizeReg, idxReg, BB, IP); // Emit an ADD to add memberOffsetReg to the basePtr. - BuildMI (BB, X86::ADDrr32, 2, - nextBasePtrReg).addReg (basePtrReg).addReg (memberOffsetReg); + BMI(MBB, IP, X86::ADDrr32, 2, + nextBasePtrReg).addReg (basePtrReg).addReg (memberOffsetReg); } // Now that we are here, further indices refer to subtypes of this // one, so we don't need to worry about basePtrReg itself, anymore. @@ -978,7 +997,7 @@ void ISel::emitGEPOperation(MachineBasicBlock *BB, // basePtrReg. Move it to the register where we were expected to // put the answer. A 32-bit move should do it, because we are in // ILP32 land. - BuildMI (BB, X86::MOVrr32, 1, TargetReg).addReg (basePtrReg); + BMI(MBB, IP, X86::MOVrr32, 1, TargetReg).addReg (basePtrReg); }