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Teach instsimplify some tricks about exact/nuw/nsw shifts.

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improve interfaces to instsimplify to take this info.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125196 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-02-09 17:15:04 +00:00
parent 6bfd77e315
commit 81a0dc9115
4 changed files with 126 additions and 47 deletions
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10
lib/Transforms/InstCombine/InstCombineShifts.cpp
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@@ -617,13 +617,16 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantInt *Op1,
}
Instruction *InstCombiner::visitShl(BinaryOperator &I) {
if (Value *V = SimplifyShlInst(I.getOperand(0), I.getOperand(1), TD))
if (Value *V = SimplifyShlInst(I.getOperand(0), I.getOperand(1),
I.hasNoSignedWrap(), I.hasNoUnsignedWrap(),
TD))
return ReplaceInstUsesWith(I, V);
return commonShiftTransforms(I);
}
Instruction *InstCombiner::visitLShr(BinaryOperator &I) {
if (Value *V = SimplifyLShrInst(I.getOperand(0), I.getOperand(1), TD))
if (Value *V = SimplifyLShrInst(I.getOperand(0), I.getOperand(1),
I.isExact(), TD))
return ReplaceInstUsesWith(I, V);
if (Instruction *R = commonShiftTransforms(I))
@@ -652,7 +655,8 @@ Instruction *InstCombiner::visitLShr(BinaryOperator &I) {
}
Instruction *InstCombiner::visitAShr(BinaryOperator &I) {
if (Value *V = SimplifyAShrInst(I.getOperand(0), I.getOperand(1), TD))
if (Value *V = SimplifyAShrInst(I.getOperand(0), I.getOperand(1),
I.isExact(), TD))
return ReplaceInstUsesWith(I, V);
if (Instruction *R = commonShiftTransforms(I))