diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp index 8729ecc911b..a934e0aa68e 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp @@ -530,6 +530,11 @@ Instruction *InstCombiner::narrowRotate(TruncInst &Trunc) { match(R, m_And(m_Neg(m_Specific(X)), m_SpecificInt(Mask)))) return X; + // Same as above, but the shift amount may be extended after masking: + if (match(L, m_ZExt(m_And(m_Value(X), m_SpecificInt(Mask)))) && + match(R, m_ZExt(m_And(m_Neg(m_Specific(X)), m_SpecificInt(Mask))))) + return X; + return nullptr; }; |
