diff options
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index fa615cfc51..7fed5aa8c6 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -1872,6 +1872,13 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) { A = 0; } + if (match(Op0, m_And(m_Value(A), m_Value(B)))) + if (A == Op1 || B == Op1) // (A & ?) | A --> A + return ReplaceInstUsesWith(I, Op1); + if (match(Op1, m_And(m_Value(A), m_Value(B)))) + if (A == Op0 || B == Op0) // A | (A & ?) --> A + return ReplaceInstUsesWith(I, Op0); + if (match(Op1, m_Not(m_Value(B)))) { // Op0 | ~B if (Op0 == B) return ReplaceInstUsesWith(I, |