sysdeps/i386/fpu/fgetexcptflg.c

   1 /* Store current representation for exceptions.
   2    Copyright (C) 1997,99,2000,01,11 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 <ldsodefs.h>
  23 #include <dl-procinfo.h>
  24
  25
  26 int
  27 __fegetexceptflag (fexcept_t *flagp, int excepts)
  28 {
  29   fexcept_t temp;
  30
  31   /* Get the current exceptions.  */
  32   __asm__ ("fnstsw %0" : "=m" (*&temp));
  33
  34   *flagp = temp & excepts & FE_ALL_EXCEPT;
  35
  36   /* If the CPU supports SSE, we clear the MXCSR as well.  */
  37   if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
  38     {
  39       unsigned int sse_exc;
  40
  41       /* Get the current MXCSR.  */
  42       __asm__ ("stmxcsr %0" : "=m" (*&sse_exc));
  43
  44       *flagp |= sse_exc & excepts & FE_ALL_EXCEPT;
  45     }
  46
  47   /* Success.  */
  48   return 0;
  49 }
  50
  51 #include <shlib-compat.h>
  52 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  53 strong_alias (__fegetexceptflag, __old_fegetexceptflag)
  54 compat_symbol (libm, __old_fegetexceptflag, fegetexceptflag, GLIBC_2_1);
  55 #endif
  56
  57 versioned_symbol (libm, __fegetexceptflag, fegetexceptflag, GLIBC_2_2);