diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp index 1e4c38c4c84..97ad92d2aad 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp @@ -1795,8 +1795,10 @@ Instruction *InstCombiner::visitFSub(BinaryOperator &I) { return NV; // X - C --> X + (-C) + // But don't transform constant expressions because there's an inverse fold + // for X + (-Y) --> X - Y. Constant *C; - if (match(Op1, m_Constant(C))) + if (match(Op1, m_Constant(C)) && !isa<ConstantExpr>(Op1)) return BinaryOperator::CreateFAddFMF(Op0, ConstantExpr::getFNeg(C), &I); // X - (-Y) --> X + Y |
