mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/* Set floating-point environment exception handling.
|
|
Copyright (C) 1997-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <fenv.h>
|
|
#include <math.h>
|
|
#include <unistd.h>
|
|
#include <ldsodefs.h>
|
|
#include <dl-procinfo.h>
|
|
|
|
int
|
|
__fesetexceptflag (const fexcept_t *flagp, int excepts)
|
|
{
|
|
fenv_t temp;
|
|
|
|
/* Get the current environment. We have to do this since we cannot
|
|
separately set the status word. */
|
|
__asm__ ("fnstenv %0" : "=m" (*&temp));
|
|
|
|
temp.__status_word &= ~(excepts & FE_ALL_EXCEPT);
|
|
temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT;
|
|
|
|
/* Store the new status word (along with the rest of the environment.
|
|
Possibly new exceptions are set but they won't get executed unless
|
|
the next floating-point instruction. */
|
|
__asm__ ("fldenv %0" : : "m" (*&temp));
|
|
|
|
/* If the CPU supports SSE, we set the MXCSR as well. */
|
|
if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
|
|
{
|
|
unsigned int xnew_exc;
|
|
|
|
/* Get the current MXCSR. */
|
|
__asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
|
|
|
|
/* Set the relevant bits. */
|
|
xnew_exc &= ~(excepts & FE_ALL_EXCEPT);
|
|
xnew_exc |= *flagp & excepts & FE_ALL_EXCEPT;
|
|
|
|
/* Put the new data in effect. */
|
|
__asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));
|
|
}
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|
|
|
|
#include <shlib-compat.h>
|
|
#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
|
|
strong_alias (__fesetexceptflag, __old_fesetexceptflag)
|
|
compat_symbol (libm, __old_fesetexceptflag, fesetexceptflag, GLIBC_2_1);
|
|
#endif
|
|
|
|
versioned_symbol (libm, __fesetexceptflag, fesetexceptflag, GLIBC_2_2);
|