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* [PATCH] libstdc++: Reuse double overload of __convert_to_v if possible
@ 2023-07-24 20:05 Jonathan Wakely
  0 siblings, 0 replies; only message in thread
From: Jonathan Wakely @ 2023-07-24 20:05 UTC (permalink / raw)
  To: libstdc++, gcc-patches

This seems like a worthwhile change. In theory we could make it even
smaller by using a symbol alias, but I'm not sure that's supported on
the targets where this will actually help.

Any objections?

-- >8 --

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.


	* config/locale/generic/ (__convert_to_v): Reuse
	double overload for long double if possible.
 libstdc++-v3/config/locale/generic/ | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libstdc++-v3/config/locale/generic/ b/libstdc++-v3/config/locale/generic/
index 8849d78fdfa..866ba0361dc 100644
--- a/libstdc++-v3/config/locale/generic/
+++ b/libstdc++-v3/config/locale/generic/
     __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;
       // Assumes __s formatted for "C" locale.
       const char* __sav = __set_C_locale();
       if (!__sav)
       setlocale(LC_ALL, __sav);
       delete [] __sav;
+#endif // __DBL_MANT_DIG__ == __LDBL_MANT_DIG__

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2023-07-24 20:05 [PATCH] libstdc++: Reuse double overload of __convert_to_v if possible Jonathan Wakely

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