[libcxx-commits] [libcxx] [libc++] Check explicit values in the partial_ordering comparators for better code gen (PR #81366)

[Louis Dionne via libcxx-commits]

================
@@ -62,39 +58,39 @@ class partial_ordering {
   _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(partial_ordering, partial_ordering) noexcept = default;
 
   _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
-    return __v.__is_ordered() && __v.__value_ == 0;
+    return __v.__value_ == 0;
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ldionne wrote:

Why don't we write these comparisons this way instead?

```c++
__v.__value_ == _OrdResult::__equiv
__v.__value_ == _OrdResult::__equiv || __v.__value_ == _OrdResult::__less
__v.__value_ == _OrdResult::__greater

// etc...
```



https://github.com/llvm/llvm-project/pull/81366