================
@@ -1523,13 +1523,37 @@ mlir::Value CIRGenFunction::emitX86BuiltinExpr(unsigned
builtinID,
case X86::BI__mulh:
case X86::BI__umulh:
case X86::BI_mul128:
- case X86::BI_umul128:
- case X86::BI__faststorefence:
+ case X86::BI_umul128: {
+ cgm.errorNYI(expr->getSourceRange(),
+ std::string("unimplemented X86 builtin call: ") +
+ getContext().BuiltinInfo.getName(builtinID));
+ return std::nullopt;
+ }
+ case X86::BI__faststorefence: {
+ cir::AtomicFenceOp::create(
+ builder, getLoc(expr->getExprLoc()),
+ cir::MemOrder::SequentiallyConsistent,
+ cir::SyncScopeKindAttr::get(&getMLIRContext(),
+ cir::SyncScopeKind::System));
+ return mlir::Value{};
----------------
Luhaocong wrote:
It seems not correct if return type of this function is
`std::optional<mlir::Value>` ?
```
std::optional<mlir::Value> func() {
return {}; // equal to `return std::nullopt` ?
}
```
https://github.com/llvm/llvm-project/pull/171094
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