/// 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<ISel> {
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); }
// 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);
///
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.
/// 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());
copyConstantToRegister(C, Reg, BB, IPt);
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(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<Argument>(V)) {
// Find the position of the argument in the argument list.
const Function *f = F->getFunction ();
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;
/// 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<ConstantExpr>(C)) {
if (CE->getOpcode() == Instruction::GetElementPtr) {
emitGEPOperation(BB, IP, CE->getOperand(0),
if (C->getType()->isSigned()) {
ConstantSInt *CSI = cast<ConstantSInt>(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<ConstantUInt>(C);
- BMI(BB, IP, IntegralOpcodeTab[Class], 1, R).addZImm(CUI->getValue());
+ BMI(MBB, IP, IntegralOpcodeTab[Class], 1, R).addZImm(CUI->getValue());
}
- } else if (isa <ConstantPointerNull> (C)) {
+ } else if (isa<ConstantPointerNull>(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<ConstantPointerRef>(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!");
// 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
/// 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);
// 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);
}
// 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)
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
};
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.
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];
// 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.
// 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);
}
projects / oota-llvm.git / blobdiff