[libcxx-commits] [PATCH] D137499: [libc++][math.h] Remove __libcpp_<func> functions and instead call builtins directly

[Nikolas Klauser via Phabricator via libcxx-commits]

philnik added inline comments.


================
Comment at: libcxx/include/math.h:532
-_LIBCPP_HIDE_FROM_ABI bool __libcpp_isgreater(_A1 __x, _A2 __y) _NOEXCEPT {
-  return isgreater(__x, __y);
-}
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Mordante wrote:
> This one and the next ones didn't call a `__builtin`. Does this work on all supported platforms?
I think the builtin just resolves to either a compiler-rt/libgcc function call or an instruction on most (all?) platforms. At least on x86, armv7 and powerpc64: https://godbolt.org/z/8cb4z98hz, so I think it's fine. In [glibc](https://github.com/bminor/glibc/blob/master/math/math.h#L1305-L1310) the normal functions are just aliases to the builtins.


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  https://reviews.llvm.org/D137499/new/

https://reviews.llvm.org/D137499