diff options
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineSelect.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineSelect.cpp b/lib/Transforms/InstCombine/InstCombineSelect.cpp index 84f80f0d74..f1ea8ead1f 100644 --- a/lib/Transforms/InstCombine/InstCombineSelect.cpp +++ b/lib/Transforms/InstCombine/InstCombineSelect.cpp @@ -682,6 +682,13 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) { return BinaryOperator::CreateOr(CondVal, FalseVal); else if (CondVal == FalseVal) return BinaryOperator::CreateAnd(CondVal, TrueVal); + + // select a, ~a, b -> (~a)&b + // select a, b, ~a -> (~a)|b + if (match(TrueVal, m_Not(m_Specific(CondVal)))) + return BinaryOperator::CreateAnd(TrueVal, FalseVal); + else if (match(FalseVal, m_Not(m_Specific(CondVal)))) + return BinaryOperator::CreateOr(TrueVal, FalseVal); } // Selecting between two integer constants? |