From: Jonathan Wakely <jwakely@redhat.com>
Date: Mon, 24 Jul 2023 10:38:32 +0000 (+0100)
Subject: libstdc++: Reuse double overload of __convert_to_v if possible
X-Git-Tag: basepoints/gcc-15~6831
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aad83d61d2e92b168688f7b6bd00b8604d11fc9f;p=thirdparty%2Fgcc.git

libstdc++: Reuse double overload of __convert_to_v if possible

For targets where double and long double have the same representation we
can reuse the same __convert_to_v code for both types. This will
slightly reduce the size of the compiled code in the library.

libstdc++-v3/ChangeLog:

	* config/locale/generic/c_locale.cc (__convert_to_v): Reuse
	double overload for long double if possible.
---

diff --git a/libstdc++-v3/config/locale/generic/c_locale.cc b/libstdc++-v3/config/locale/generic/c_locale.cc
index 8849d78fdfac..866ba0361dc4 100644
--- a/libstdc++-v3/config/locale/generic/c_locale.cc
+++ b/libstdc++-v3/config/locale/generic/c_locale.cc
@@ -187,6 +187,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     __convert_to_v(const char* __s, long double& __v,
 		   ios_base::iostate& __err, const __c_locale&) throw()
     {
+#if __DBL_MANT_DIG__ == __LDBL_MANT_DIG__
+      double __d;
+      __convert_to_v(__s, __d, __err, __c_locale);
+      __v = __d;
+#else
       // Assumes __s formatted for "C" locale.
       const char* __sav = __set_C_locale();
       if (!__sav)
@@ -233,6 +238,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       setlocale(LC_ALL, __sav);
       delete [] __sav;
+#endif // __DBL_MANT_DIG__ == __LDBL_MANT_DIG__
     }
 
   void