glibc/sysdeps/i386/fpu/fegetmode.c

/* Store current floating-point control modes.  i386 version.
   Copyright (C) 2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <fenv.h>
#include <fpu_control.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <dl-procinfo.h>

int
fegetmode (femode_t *modep)
{
  _FPU_GETCW (modep->__control_word);
  if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0)
    __asm__ ("stmxcsr %0" : "=m" (modep->__mxcsr));
  return 0;
}