[thirdparty/glibc.git] / sysdeps / i386 / fpu / ftestexcept.c

/* Test exception in current environment.
   Copyright (C) 1997-2021 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
   <https://www.gnu.org/licenses/>.  */

#include <fenv.h>
#include <unistd.h>
#include <dl-procinfo.h>
#include <ldsodefs.h>

int
fetestexcept (int excepts)
{
  short temp;
  int xtemp = 0;

  /* Get current exceptions.  */
  __asm__ ("fnstsw %0" : "=a" (temp));

  /* If the CPU supports SSE we test the MXCSR as well.  */
  if (CPU_FEATURE_USABLE (SSE))
    __asm__ ("stmxcsr %0" : "=m" (*&xtemp));

  return (temp | xtemp) & excepts & FE_ALL_EXCEPT;
}
libm_hidden_def (fetestexcept)
Commit	Line	Data
63551311	1	/* Test exception in current environment.
2b778ceb	2	Copyright (C) 1997-2021 Free Software Foundation, Inc.
63551311 UD	3	This file is part of the GNU C Library.
	4	Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
63551311 UD	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	14	Lesser General Public License for more details.
63551311	15
41bdb6e2	16	You should have received a copy of the GNU Lesser General Public
59ba27a6	17	License along with the GNU C Library; if not, see
5a82c748	18	<https://www.gnu.org/licenses/>. */
63551311 UD	19
63551311 UD	20	#include <fenv.h>
85dd1003 UD	21	#include <unistd.h>
	22	#include <dl-procinfo.h>
	23	#include <ldsodefs.h>
63551311 UD	24
	25	int
	26	fetestexcept (int excepts)
	27	{
b4b166af	28	short temp;
85dd1003	29	int xtemp = 0;
63551311 UD	30
	31	/* Get current exceptions. */
	32	__asm__ ("fnstsw %0" : "=a" (temp));
	33
85dd1003	34	/* If the CPU supports SSE we test the MXCSR as well. */
107e6a3c	35	if (CPU_FEATURE_USABLE (SSE))
85dd1003 UD	36	__asm__ ("stmxcsr %0" : "=m" (*&xtemp));
	37
	38	return (temp \| xtemp) & excepts & FE_ALL_EXCEPT;
63551311	39	}
9ff8d36f	40	libm_hidden_def (fetestexcept)