================
@@ -457,8 +500,11 @@ bool AtomicExpandImpl::processAtomicInstr(Instruction *I) {
bool AtomicExpandImpl::run(Function &F,
const ModuleLibcallLoweringInfo &LibcallResult,
const TargetMachine *TM) {
+ SingleThreaded = F.getParent()->getThreadModel() == ThreadModel::Single;
+
const auto *Subtarget = TM->getSubtargetImpl(F);
- if (!Subtarget->enableAtomicExpand())
+ // In a single-threaded environment atomics are lowered to non-atomic form
+ if (!SingleThreaded && !Subtarget->enableAtomicExpand())
----------------
arsenm wrote:
IMO we should just delete enableAtomicExpand, and add it to the default
pipeline. We have the worst of both worlds where targets need to both implement
enableAtomicExpand, and add it to the pass config
https://github.com/llvm/llvm-project/pull/223157
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