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Add feraiseexcept optimization for x86-32

This commit is contained in:
Ulrich Drepper 2011-12-22 17:52:30 -05:00
parent db910efdbd
commit aed9d17150
2 changed files with 42 additions and 1 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2011-12-22 Ulrich Drepper <drepper@gmail.com>
* sysdeps/i386/fpu/bits/fenv.h [__SSE_MATH__]: Add feraiseexcept
optimization.
[BZ #13185]
* sysdeps/i386/fpu/fgetexcptflg.c (__fegetexceptflag): Also return
SSE flags if possible.

40
sysdeps/i386/fpu/bits/fenv.h
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@ -1,4 +1,4 @@
/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
/* Copyright (C) 1997, 1998, 1999, 2000, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -88,3 +88,41 @@ fenv_t;
/* Floating-point environment where none of the exception is masked. */
# define FE_NOMASK_ENV ((__const fenv_t *) -2)
#endif
#if defined __SSE_MATH__ && defined __USE_EXTERN_INLINES
__BEGIN_DECLS
/* Optimized versions. */
extern int __REDIRECT_NTH (__feraiseexcept_renamed, (int), feraiseexcept);
__extern_inline int
__NTH (feraiseexcept (int __excepts))
{
if (__builtin_constant_p (__excepts)
&& (__excepts & ~(FE_INVALID | FE_DIVBYZERO)) == 0)
{
if ((FE_INVALID & __excepts) != 0)
{
/* One example of a invalid operation is 0.0 / 0.0. */
float __f = 0.0;
__asm__ __volatile__ ("divss %0, %0 " : : "x" (__f));
(void) &__f;
}
if ((FE_DIVBYZERO & __excepts) != 0)
{
float __f = 1.0;
float __g = 0.0;
__asm__ __volatile__ ("divss %1, %0" : : "x" (__f), "x" (__g));
(void) &__f;
}
return 0;
}
return __feraiseexcept_renamed (__excepts);
}
__END_DECLS
#endif