sysdeps/i386/fpu/ftestexcept.c

   1 /* Test exception in current environment.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   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
   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.
  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
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21 #include <unistd.h>
  22 #include <dl-procinfo.h>
  23 #include <ldsodefs.h>
  24
  25 int
  26 fetestexcept (int excepts)
  27 {
  28   short temp;
  29   int xtemp = 0;
  30
  31   /* Get current exceptions.  */
  32   __asm__ ("fnstsw %0" : "=a" (temp));
  33
  34   /* If the CPU supports SSE we test the MXCSR as well.  */
  35   if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
  36     __asm__ ("stmxcsr %0" : "=m" (*&xtemp));
  37
  38   return (temp | xtemp) & excepts & FE_ALL_EXCEPT;
  39 }
  40 libm_hidden_def (fetestexcept)