sysdeps/x86_64/fpu/fgetexcptflg.c

   1 /* Store current representation for exceptions.
   2    Copyright (C) 2001 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <fenv.h>
  21
  22 int
  23 fegetexceptflag (fexcept_t *flagp, int excepts)
  24 {
  25   fexcept_t temp;
  26   unsigned int mxscr;
  27
  28   /* Get the current exceptions for the x87 FPU and SSE unit.  */
  29   __asm__ ("fnstsw %0\n"
  30            "stmxcsr %1" : "=m" (*&temp), "=m" (*&mxscr));
  31
  32   *flagp = (temp | mxscr) & FE_ALL_EXCEPT & excepts;
  33
  34   /* Success.  */
  35   return 0;
  36 }