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eliminate InsertCastBefore, use the builder instead.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80505 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-08-30 20:01:10 +00:00
parent 08142f2560
commit 2345d1d22e
1 changed files with 19 additions and 50 deletions
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69
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -303,21 +303,6 @@ namespace {
Worklist.Add(New);
return New;
}
/// InsertCastBefore - Insert a cast of V to TY before the instruction POS.
/// This also adds the cast to the worklist. Finally, this returns the
/// cast.
Value *InsertCastBefore(Instruction::CastOps opc, Value *V, const Type *Ty,
Instruction &Pos) {
if (V->getType() == Ty) return V;
if (Constant *CV = dyn_cast<Constant>(V))
return ConstantExpr::getCast(opc, CV, Ty);
Instruction *C = CastInst::Create(opc, V, Ty, V->getName(), &Pos);
Worklist.Add(C);
return C;
}
// ReplaceInstUsesWith - This method is to be used when an instruction is
// found to be dead, replacable with another preexisting expression. Here
@ -1892,7 +1877,7 @@ struct AddMaskingAnd {
static Value *FoldOperationIntoSelectOperand(Instruction &I, Value *SO,
InstCombiner *IC) {
if (CastInst *CI = dyn_cast<CastInst>(&I))
return IC->InsertCastBefore(CI->getOpcode(), SO, I.getType(), I);
return IC->Builder->CreateCast(CI->getOpcode(), SO, I.getType());
// Figure out if the constant is the left or the right argument.
bool ConstIsRHS = isa<Constant>(I.getOperand(1));
@ -2764,14 +2749,8 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
// If the multiply type is not the same as the source type, sign extend
// or truncate to the multiply type.
if (I.getType() != V->getType()) {
uint32_t SrcBits = V->getType()->getPrimitiveSizeInBits();
uint32_t DstBits = I.getType()->getPrimitiveSizeInBits();
Instruction::CastOps opcode =
(SrcBits == DstBits ? Instruction::BitCast :
(SrcBits < DstBits ? Instruction::SExt : Instruction::Trunc));
V = InsertCastBefore(opcode, V, I.getType(), I);
}
if (I.getType() != V->getType())
V = Builder->CreateIntCast(V, I.getType(), true);
Value *OtherOp = Op0 == BoolCast ? I.getOperand(1) : Op0;
return BinaryOperator::CreateAnd(V, OtherOp);
@ -8262,9 +8241,7 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
return ReplaceInstUsesWith(CI, Res);
// We need to emit a cast to truncate, then a cast to sext.
return CastInst::Create(Instruction::SExt,
InsertCastBefore(Instruction::Trunc, Res, Src->getType(),
CI), DestTy);
return new SExtInst(Builder->CreateTrunc(Res, Src->getType()), DestTy);
}
}
}
@ -8284,8 +8261,8 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
// Don't insert two casts unless at least one can be eliminated.
if (!ValueRequiresCast(CI.getOpcode(), Op1, DestTy, TD) ||
!ValueRequiresCast(CI.getOpcode(), Op0, DestTy, TD)) {
Value *Op0c = InsertCastBefore(Instruction::Trunc, Op0, DestTy, *SrcI);
Value *Op1c = InsertCastBefore(Instruction::Trunc, Op1, DestTy, *SrcI);
Value *Op0c = Builder->CreateTrunc(Op0, DestTy, Op0->getName());
Value *Op1c = Builder->CreateTrunc(Op1, DestTy, Op1->getName());
return BinaryOperator::Create(
cast<BinaryOperator>(SrcI)->getOpcode(), Op0c, Op1c);
}
@ -8296,7 +8273,7 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
SrcI->getOpcode() == Instruction::Xor &&
Op1 == ConstantInt::getTrue(*Context) &&
(!Op0->hasOneUse() || !isa<CmpInst>(Op0))) {
Value *New = InsertCastBefore(Instruction::ZExt, Op0, DestTy, CI);
Value *New = Builder->CreateZExt(Op0, DestTy, Op0->getName());
return BinaryOperator::CreateXor(New,
ConstantInt::get(CI.getType(), 1));
}
@ -8307,8 +8284,8 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
ConstantInt *CI = dyn_cast<ConstantInt>(Op1);
if (CI && DestBitSize < SrcBitSize &&
CI->getLimitedValue(DestBitSize) < DestBitSize) {
Value *Op0c = InsertCastBefore(Instruction::Trunc, Op0, DestTy, *SrcI);
Value *Op1c = InsertCastBefore(Instruction::Trunc, Op1, DestTy, *SrcI);
Value *Op0c = Builder->CreateTrunc(Op0, DestTy, Op0->getName());
Value *Op1c = Builder->CreateTrunc(Op1, DestTy, Op1->getName());
return BinaryOperator::CreateShl(Op0c, Op1c);
}
break;
@ -8349,7 +8326,7 @@ Instruction *InstCombiner::visitTrunc(TruncInst &CI) {
// Okay, we can shrink this. Truncate the input, then return a new
// shift.
Value *V1 = InsertCastBefore(Instruction::Trunc, ShiftOp, Ty, CI);
Value *V1 = Builder->CreateTrunc(ShiftOp, Ty, ShiftOp->getName());
Value *V2 = ConstantExpr::getTrunc(ShAmtV, Ty);
return BinaryOperator::CreateLShr(V1, V2);
}
@ -8500,8 +8477,8 @@ Instruction *InstCombiner::visitZExt(ZExtInst &CI) {
if (LHS && RHS && LHS->hasOneUse() && RHS->hasOneUse() &&
(transformZExtICmp(LHS, CI, false) ||
transformZExtICmp(RHS, CI, false))) {
Value *LCast = InsertCastBefore(Instruction::ZExt, LHS, CI.getType(), CI);
Value *RCast = InsertCastBefore(Instruction::ZExt, RHS, CI.getType(), CI);
Value *LCast = Builder->CreateZExt(LHS, CI.getType(), LHS->getName());
Value *RCast = Builder->CreateZExt(RHS, CI.getType(), RHS->getName());
return BinaryOperator::Create(Instruction::Or, LCast, RCast);
}
}
@ -8671,10 +8648,8 @@ Instruction *InstCombiner::visitFPTrunc(FPTruncInst &CI) {
// the cast, do this xform.
if (LHSTrunc->getType()->getScalarSizeInBits() <= DstSize &&
RHSTrunc->getType()->getScalarSizeInBits() <= DstSize) {
LHSTrunc = InsertCastBefore(Instruction::FPExt, LHSTrunc,
CI.getType(), CI);
RHSTrunc = InsertCastBefore(Instruction::FPExt, RHSTrunc,
CI.getType(), CI);
LHSTrunc = Builder->CreateFPExt(LHSTrunc, CI.getType());
RHSTrunc = Builder->CreateFPExt(RHSTrunc, CI.getType());
return BinaryOperator::Create(OpI->getOpcode(), LHSTrunc, RHSTrunc);
}
}
@ -8835,10 +8810,9 @@ Instruction *InstCombiner::visitBitCast(BitCastInst &CI) {
if (const VectorType *DestVTy = dyn_cast<VectorType>(DestTy)) {
if (DestVTy->getNumElements() == 1) {
if (!isa<VectorType>(SrcTy)) {
Value *Elem = InsertCastBefore(Instruction::BitCast, Src,
DestVTy->getElementType(), CI);
Value *Elem = Builder->CreateBitCast(Src, DestVTy->getElementType());
return InsertElementInst::Create(UndefValue::get(DestTy), Elem,
Constant::getNullValue(Type::getInt32Ty(*Context)));
Constant::getNullValue(Type::getInt32Ty(*Context)));
}
// FIXME: Canonicalize bitcast(insertelement) -> insertelement(bitcast)
}
@ -8872,10 +8846,8 @@ Instruction *InstCombiner::visitBitCast(BitCastInst &CI) {
Tmp->getOperand(0)->getType() == DestTy) ||
((Tmp = dyn_cast<CastInst>(SVI->getOperand(1))) &&
Tmp->getOperand(0)->getType() == DestTy)) {
Value *LHS = InsertCastBefore(Instruction::BitCast,
SVI->getOperand(0), DestTy, CI);
Value *RHS = InsertCastBefore(Instruction::BitCast,
SVI->getOperand(1), DestTy, CI);
Value *LHS = Builder->CreateBitCast(SVI->getOperand(0), DestTy);
Value *RHS = Builder->CreateBitCast(SVI->getOperand(1), DestTy);
// Return a new shuffle vector. Use the same element ID's, as we
// know the vector types match #elts.
return new ShuffleVectorInst(LHS, RHS, SVI->getOperand(2));
@ -10841,13 +10813,10 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// to what we need. If narrower, sign-extend it to what we need. This
// explicit cast can make subsequent optimizations more obvious.
unsigned OpBits = cast<IntegerType>((*I)->getType())->getBitWidth();
if (OpBits == PtrSize)
continue;
Instruction::CastOps Opc =
OpBits > PtrSize ? Instruction::Trunc : Instruction::SExt;
*I = InsertCastBefore(Opc, *I, TD->getIntPtrType(GEP.getContext()), GEP);
*I = Builder->CreateIntCast(*I, TD->getIntPtrType(GEP.getContext()),true);
MadeChange = true;
}
if (MadeChange) return &GEP;