sysdeps/i386/fpu/ftestexcept.c

   1 /* Test exception in current environment.
   2    Copyright (C) 1997-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv.h>
  20 #include <unistd.h>
  21 #include <dl-procinfo.h>
  22 #include <ldsodefs.h>
  23
  24 int
  25 fetestexcept (int excepts)
  26 {
  27   short temp;
  28   int xtemp = 0;
  29
  30   /* Get current exceptions.  */
  31   __asm__ ("fnstsw %0" : "=a" (temp));
  32
  33   /* If the CPU supports SSE we test the MXCSR as well.  */
  34   if (CPU_FEATURE_USABLE (SSE))
  35     __asm__ ("stmxcsr %0" : "=m" (*&xtemp));
  36
  37   return (temp | xtemp) & excepts & FE_ALL_EXCEPT;
  38 }
  39 libm_hidden_def (fetestexcept)