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| author | Chris Lattner <sabre@nondot.org> | 2011-02-09 17:15:04 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2011-02-09 17:15:04 +0000 |
| commit | 81a0dc911586c77421c2255aa417dc9b350b9e20 (patch) | |
| tree | f6a7b1c0a47ed7fa813cb89a3c0f5d48923bbdf5 /lib/Transforms/InstCombine/InstCombineShifts.cpp | |
| parent | 6bfd77e3158b10861c76529492eae24a573390a8 (diff) | |
| download | llvm-81a0dc911586c77421c2255aa417dc9b350b9e20.tar.gz llvm-81a0dc911586c77421c2255aa417dc9b350b9e20.tar.bz2 llvm-81a0dc911586c77421c2255aa417dc9b350b9e20.tar.xz | |
Teach instsimplify some tricks about exact/nuw/nsw shifts.
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
Diffstat (limited to 'lib/Transforms/InstCombine/InstCombineShifts.cpp')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineShifts.cpp | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineShifts.cpp b/lib/Transforms/InstCombine/InstCombineShifts.cpp index 988f29e16a..395d79d5a7 100644 --- a/lib/Transforms/InstCombine/InstCombineShifts.cpp +++ b/lib/Transforms/InstCombine/InstCombineShifts.cpp @@ -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)) |