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Diffstat (limited to 'lib/Transforms/InstCombine/InstCombineCasts.cpp')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineCasts.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineCasts.cpp b/lib/Transforms/InstCombine/InstCombineCasts.cpp index 1372a1891f..89719bef09 100644 --- a/lib/Transforms/InstCombine/InstCombineCasts.cpp +++ b/lib/Transforms/InstCombine/InstCombineCasts.cpp @@ -396,6 +396,11 @@ static bool CanEvaluateTruncated(Value *V, const Type *Ty) { case Instruction::Trunc: // trunc(trunc(x)) -> trunc(x) return true; + case Instruction::ZExt: + case Instruction::SExt: + // trunc(ext(x)) -> ext(x) if the source type is smaller than the new dest + // trunc(ext(x)) -> trunc(x) if the source type is larger than the new dest + return true; case Instruction::Select: { SelectInst *SI = cast<SelectInst>(I); return CanEvaluateTruncated(SI->getTrueValue(), Ty) && |