diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineAndOrXor.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp b/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp index 1cb18e12ee..6cf405328a 100644 --- a/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp +++ b/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp @@ -2003,7 +2003,14 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) { } } } - + + // or(sext(A), B) -> A ? -1 : B where A is an i1 + // or(A, sext(B)) -> B ? -1 : A where B is an i1 + if (match(Op0, m_SExt(m_Value(A))) && A->getType()->isIntegerTy(1)) + return SelectInst::Create(A, ConstantInt::getSigned(I.getType(), -1), Op1); + if (match(Op1, m_SExt(m_Value(A))) && A->getType()->isIntegerTy(1)) + return SelectInst::Create(A, ConstantInt::getSigned(I.getType(), -1), Op0); + // Note: If we've gotten to the point of visiting the outer OR, then the // inner one couldn't be simplified. If it was a constant, then it won't // be simplified by a later pass either, so we try swapping the inner/outer |