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cleanup

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92790 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-05 22:07:33 +00:00
parent c0f79af143
commit 274ad68cc7
1 changed files with 15 additions and 18 deletions
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31
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -498,12 +498,6 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
if (Instruction *Result = commonCastTransforms(CI)) if (Instruction *Result = commonCastTransforms(CI))
return Result; return Result;
Value *Src = CI.getOperand(0);
const Type *SrcTy = Src->getType();
const Type *DestTy = CI.getType();
uint32_t SrcBitSize = SrcTy->getScalarSizeInBits();
uint32_t DestBitSize = DestTy->getScalarSizeInBits();
// See if we can simplify any instructions used by the LHS whose sole // See if we can simplify any instructions used by the LHS whose sole
// purpose is to compute bits we don't care about. // purpose is to compute bits we don't care about.
if (SimplifyDemandedInstructionBits(CI)) if (SimplifyDemandedInstructionBits(CI))
@ -511,18 +505,23 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
// If the source isn't an instruction or has more than one use then we // If the source isn't an instruction or has more than one use then we
// can't do anything more. // can't do anything more.
Instruction *SrcI = dyn_cast<Instruction>(Src); Instruction *Src = dyn_cast<Instruction>(CI.getOperand(0));
if (!SrcI || !Src->hasOneUse()) if (!Src || !Src->hasOneUse())
return 0; return 0;
const Type *SrcTy = Src->getType();
const Type *DestTy = CI.getType();
uint32_t SrcBitSize = SrcTy->getScalarSizeInBits();
uint32_t DestBitSize = DestTy->getScalarSizeInBits();
// Attempt to propagate the cast into the instruction for int->int casts. // Attempt to propagate the cast into the instruction for int->int casts.
int NumCastsRemoved = 0; int NumCastsRemoved = 0;
// Only do this if the dest type is a simple type, don't convert the // Only do this if the dest type is a simple type, don't convert the
// expression tree to something weird like i93 unless the source is also // expression tree to something weird like i93 unless the source is also
// strange. // strange.
if ((isa<VectorType>(DestTy) || if ((isa<VectorType>(DestTy) ||
ShouldChangeType(SrcI->getType(), DestTy)) && ShouldChangeType(Src->getType(), DestTy)) &&
CanEvaluateInDifferentType(SrcI, DestTy, CanEvaluateInDifferentType(Src, DestTy,
CI.getOpcode(), NumCastsRemoved)) { CI.getOpcode(), NumCastsRemoved)) {
// If this cast is a truncate, evaluting in a different type always // If this cast is a truncate, evaluting in a different type always
// eliminates the cast, so it is always a win. If this is a zero-extension, // eliminates the cast, so it is always a win. If this is a zero-extension,
@ -546,7 +545,7 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
if (!DoXForm && 0) { if (!DoXForm && 0) {
// If it's unnecessary to issue an AND to clear the high bits, it's // If it's unnecessary to issue an AND to clear the high bits, it's
// always profitable to do this xform. // always profitable to do this xform.
Value *TryRes = EvaluateInDifferentType(SrcI, DestTy, false); Value *TryRes = EvaluateInDifferentType(Src, DestTy, false);
APInt Mask(APInt::getBitsSet(DestBitSize, SrcBitSize, DestBitSize)); APInt Mask(APInt::getBitsSet(DestBitSize, SrcBitSize, DestBitSize));
if (MaskedValueIsZero(TryRes, Mask)) if (MaskedValueIsZero(TryRes, Mask))
return ReplaceInstUsesWith(CI, TryRes); return ReplaceInstUsesWith(CI, TryRes);
@ -559,7 +558,7 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
} }
case Instruction::SExt: { case Instruction::SExt: {
DoXForm = NumCastsRemoved >= 2; DoXForm = NumCastsRemoved >= 2;
if (!DoXForm && !isa<TruncInst>(SrcI) && 0) { if (!DoXForm && !isa<TruncInst>(Src) && 0) {
// If we do not have to emit the truncate + sext pair, then it's always // If we do not have to emit the truncate + sext pair, then it's always
// profitable to do this xform. // profitable to do this xform.
// //
@ -569,7 +568,7 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
// t3 = sext i16 t2 to i32 // t3 = sext i16 t2 to i32
// != // !=
// i32 t1 // i32 t1
Value *TryRes = EvaluateInDifferentType(SrcI, DestTy, true); Value *TryRes = EvaluateInDifferentType(Src, DestTy, true);
unsigned NumSignBits = ComputeNumSignBits(TryRes); unsigned NumSignBits = ComputeNumSignBits(TryRes);
if (NumSignBits > (DestBitSize - SrcBitSize)) if (NumSignBits > (DestBitSize - SrcBitSize))
return ReplaceInstUsesWith(CI, TryRes); return ReplaceInstUsesWith(CI, TryRes);
@ -585,7 +584,7 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
if (DoXForm) { if (DoXForm) {
DEBUG(errs() << "ICE: EvaluateInDifferentType converting expression type" DEBUG(errs() << "ICE: EvaluateInDifferentType converting expression type"
" to avoid cast: " << CI); " to avoid cast: " << CI);
Value *Res = EvaluateInDifferentType(SrcI, DestTy, Value *Res = EvaluateInDifferentType(Src, DestTy,
CI.getOpcode() == Instruction::SExt); CI.getOpcode() == Instruction::SExt);
if (JustReplace) if (JustReplace)
// Just replace this cast with the result. // Just replace this cast with the result.
@ -634,11 +633,9 @@ Instruction *InstCombiner::visitTrunc(TruncInst &CI) {
Value *Src = CI.getOperand(0); Value *Src = CI.getOperand(0);
const Type *DestTy = CI.getType(); const Type *DestTy = CI.getType();
uint32_t DestBitWidth = DestTy->getScalarSizeInBits();
uint32_t SrcBitWidth = Src->getType()->getScalarSizeInBits();
// Canonicalize trunc x to i1 -> (icmp ne (and x, 1), 0) // Canonicalize trunc x to i1 -> (icmp ne (and x, 1), 0)
if (DestBitWidth == 1) { if (DestTy->isInteger(1)) {
Constant *One = ConstantInt::get(Src->getType(), 1); Constant *One = ConstantInt::get(Src->getType(), 1);
Src = Builder->CreateAnd(Src, One, "tmp"); Src = Builder->CreateAnd(Src, One, "tmp");
Value *Zero = Constant::getNullValue(Src->getType()); Value *Zero = Constant::getNullValue(Src->getType());