diff options
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineAtomicRMW.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAtomicRMW.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAtomicRMW.cpp index b607c6dd608..37c43977d90 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineAtomicRMW.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineAtomicRMW.cpp @@ -51,6 +51,12 @@ bool isIdempotentRMW(AtomicRMWInst& RMWI) { Instruction *InstCombiner::visitAtomicRMWInst(AtomicRMWInst &RMWI) { + // TODO: Any atomicrmw op which produces a known result in memory can be + // replaced w/an atomicrmw xchg. (see getBinOpAbsorber) + + // TODO: Any atomicrmw xchg with no uses can be converted to a atomic store + // if the ordering is compatible. + if (!isIdempotentRMW(RMWI)) return nullptr; |
