[libcxx-commits] [libcxx] [libc++][C++03] cherry-pick #104773 (PR #158244)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 updated https://github.com/llvm/llvm-project/pull/158244

>From 50d7645cad8518f99d8c4f79751cd743ea136835 Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <nikolasklauser at berlin.de>
Date: Fri, 12 Sep 2025 10:42:27 +0200
Subject: [PATCH] [libc++][C++03] cherry-pick  #104773

---
 libcxx/include/__cxx03/__math/traits.h            | 13 ++++++++-----
 libcxx/test/std/numerics/c.math/isnormal.pass.cpp |  2 --
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/libcxx/include/__cxx03/__math/traits.h b/libcxx/include/__cxx03/__math/traits.h
index 0d27680d579a4..f9d11aebe4ed6 100644
--- a/libcxx/include/__cxx03/__math/traits.h
+++ b/libcxx/include/__cxx03/__math/traits.h
@@ -109,16 +109,19 @@ _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI bool isnan(long double __x) _NOEX
 
 // isnormal
 
-template <class _A1, __enable_if_t<is_floating_point<_A1>::value, int> = 0>
-_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI bool isnormal(_A1 __x) _NOEXCEPT {
-  return __builtin_isnormal(__x);
-}
-
 template <class _A1, __enable_if_t<is_integral<_A1>::value, int> = 0>
 _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI bool isnormal(_A1 __x) _NOEXCEPT {
   return __x != 0;
 }
 
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI bool isnormal(float __x) _NOEXCEPT { return __builtin_isnormal(__x); }
+
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI bool isnormal(double __x) _NOEXCEPT { return __builtin_isnormal(__x); }
+
+_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI bool isnormal(long double __x) _NOEXCEPT {
+  return __builtin_isnormal(__x);
+}
+
 // isgreater
 
 template <class _A1, class _A2, __enable_if_t<is_arithmetic<_A1>::value && is_arithmetic<_A2>::value, int> = 0>
diff --git a/libcxx/test/std/numerics/c.math/isnormal.pass.cpp b/libcxx/test/std/numerics/c.math/isnormal.pass.cpp
index 03b086fa3f48e..76c3d13520d99 100644
--- a/libcxx/test/std/numerics/c.math/isnormal.pass.cpp
+++ b/libcxx/test/std/numerics/c.math/isnormal.pass.cpp
@@ -11,8 +11,6 @@
 // We don't control the implementation on windows
 // UNSUPPORTED: windows
 
-// XFAIL: FROZEN-CXX03-HEADERS-FIXME
-
 #include <cassert>
 #include <cmath>
 #include <limits>