Revert "[libcxx] use __builtin_isnan in std::isnan."

hyp · hyp · commit ced7c17426ec · 2020-07-21T17:21:20.000-07:00
This reverts commit 767eadd.
diff --git a/libcxx/include/math.h b/libcxx/include/math.h
@@ -510,11 +510,7 @@ _LIBCPP_INLINE_VISIBILITY
 bool
 __libcpp_isnan(_A1 __lcpp_x) _NOEXCEPT
 {
-#if __has_builtin(__builtin_isnan)
-    return __builtin_isnan(__lcpp_x);
-#else
     return isnan(__lcpp_x);
-#endif
 }
 
 #undef isnan

Original file line number	Diff line number	Diff line change
`@@ -510,11 +510,7 @@ _LIBCPP_INLINE_VISIBILITY`
`510`	`510`	`bool`
`511`	`511`	`__libcpp_isnan(_A1 __lcpp_x) _NOEXCEPT`
`512`	`512`	`{`
`513`		`-#if __has_builtin(__builtin_isnan)`
`514`		`- return __builtin_isnan(__lcpp_x);`
`515`		`-#else`
`516`	`513`	`return isnan(__lcpp_x);`
`517`		`-#endif`
`518`	`514`	`}`
`519`	`515`
`520`	`516`	`#undef isnan`