sysdeps/x86_64/fpu/ftestexcept.c

   1 /* Test exception in current environment.
   2    Copyright (C) 2001-2014 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv.h>
  20
  21 int
  22 fetestexcept (int excepts)
  23 {
  24   int temp;
  25   unsigned int mxscr;
  26
  27   /* Get current exceptions.  */
  28   __asm__ ("fnstsw %0\n"
  29            "stmxcsr %1" : "=m" (*&temp), "=m" (*&mxscr));
  30
  31   return (temp | mxscr) & excepts & FE_ALL_EXCEPT;
  32 }
  33 libm_hidden_def (fetestexcept)