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/* Set floating-point environment exception handling.
Copyright (C) 1997,99,2000,01, 2004 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <fenv.h>
#include <math.h>
#include <unistd.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 0
/* 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));
}
#endif
/* Success. */
return 0;
}
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