================
----------------
Lancern wrote:
Not a blocker for this PR, but to ensure compile-time constant folding a better
way would be to rely on the clang constant evaluator instead:
```cpp
std::optional<Expr::EvalResult> constOrdering;
if (Expr::EvalResult eval; expr->getArg(0)->EvaluateAsInt(eval,
cgf.getContext()))
constOrdering.emplace(eval);
if (!constOrdering.has_value()) {
cgf.cgm.errorNYI("Variable atomic fence ordering");
return;
}
// ...
```
https://github.com/llvm/llvm-project/pull/171248
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