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Use GCC builtins for copysign functions if desired.

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This patch is always using the corresponding GCC builtin for copysignf, copysign,
and is using the builtin for copysignl, copysignf128 if the USE_FUNCTION_BUILTIN
macros are defined to one in math-use-builtins.h.

Altough the long double version is enabled by default we still need
the macro and the alternative implementation as the _Float128 version
of the builtin is not available with all supported GCC versions.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Stefan Liebler
2019-12-11 15:09:24 +01:00
parent f82996f815
commit f818afdd3b
6 changed files with 31 additions and 15 deletions
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9
sysdeps/generic/math-use-builtins.h
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@ -19,6 +19,8 @@
#ifndef MATH_USE_BUILTINS_H
#define MATH_USE_BUILTINS_H 1
#include <features.h> /* For __GNUC_PREREQ. */
/* Define these macros to 1 to use __builtin_xyz instead of the
generic implementation. */
#define USE_NEARBYINT_BUILTIN 0
@ -51,4 +53,11 @@
#define USE_ROUNDL_BUILTIN 0
#define USE_ROUNDF128_BUILTIN 0
#define USE_COPYSIGNL_BUILTIN 1
#if __GNUC_PREREQ (7, 0)
# define USE_COPYSIGNF128_BUILTIN 1
#else
# define USE_COPYSIGNF128_BUILTIN 0
#endif
#endif /* math-use-builtins.h */