diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 792d615363..564b98165d 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -3872,7 +3872,9 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) { } // (V1 & V3)|(V2 & ~V3) -> ((V1 ^ V2) & V3) ^ V2 - if (isOnlyUse(Op0) && isOnlyUse(Op1)) { + // Disable this transformations temporarily. This causes + // mis-compilation when V2 is undefined. + if (0 && isOnlyUse(Op0) && isOnlyUse(Op1)) { // Try all combination of terms to find V3 and ~V3. if (A->hasOneUse() && match(A, m_Not(m_Value(V3)))) { if (V3 == B) |