diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp index 1b2615d4..d2c6ffe 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp @@ -1223,7 +1223,9 @@ Instruction *InstCombinerImpl::visitZExt(ZExtInst &Zext) { if (!Zext.hasNonNeg()) { // If this zero extend is only used by a shift, add nneg flag. - if (Zext.hasOneUse() && SrcTy->getScalarSizeInBits() > 2 && + if (Zext.hasOneUse() && + SrcTy->getScalarSizeInBits() > + Log2_64_Ceil(DestTy->getScalarSizeInBits()) && match(Zext.user_back(), m_Shift(m_Value(), m_Specific(&Zext)))) { Zext.setNonNeg(); return &Zext; |