[libcxx-commits] [libcxx] [libc++] Avoid including <cmath> in <format> (PR #186332)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 created https://github.com/llvm/llvm-project/pull/186332

None

>From 9b022ee5856f967826fe0fb208a49ad22ad4c7b2 Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <nikolasklauser at berlin.de>
Date: Fri, 13 Mar 2026 09:00:17 +0100
Subject: [PATCH] [libc++] Avoid including <cmath> in <format>

---
 libcxx/include/__format/formatter_floating_point.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libcxx/include/__format/formatter_floating_point.h b/libcxx/include/__format/formatter_floating_point.h
index b200bc58baa21..f4de8b927651a 100644
--- a/libcxx/include/__format/formatter_floating_point.h
+++ b/libcxx/include/__format/formatter_floating_point.h
@@ -32,12 +32,12 @@
 #include <__format/formatter_output.h>
 #include <__format/parser_std_format_spec.h>
 #include <__iterator/concepts.h>
+#include <__math/traits.h>
 #include <__memory/allocator.h>
 #include <__system_error/errc.h>
 #include <__type_traits/conditional.h>
 #include <__utility/move.h>
 #include <__utility/unreachable.h>
-#include <cmath>
 
 #if _LIBCPP_HAS_LOCALIZATION
 #  include <__locale>
@@ -637,10 +637,10 @@ _LIBCPP_HIDE_FROM_ABI auto __write_using_trailing_zeros(
 template <floating_point _Tp, class _CharT, class _FormatContext>
 _LIBCPP_HIDE_FROM_ABI typename _FormatContext::iterator
 __format_floating_point(_Tp __value, _FormatContext& __ctx, __format_spec::__parsed_specifications<_CharT> __specs) {
-  bool __negative = std::signbit(__value);
+  bool __negative = __math::signbit(__value);
 
-  if (!std::isfinite(__value)) [[unlikely]]
-    return __formatter::__format_floating_point_non_finite(__ctx.out(), __specs, __negative, std::isnan(__value));
+  if (!__math::isfinite(__value)) [[unlikely]]
+    return __formatter::__format_floating_point_non_finite(__ctx.out(), __specs, __negative, __math::isnan(__value));
 
   // Depending on the std-format-spec string the sign and the value
   // might not be outputted together: