sysdeps/x86_64/fpu/fegetenv.c

   1 /* Store current floating-point environment.
   2    Copyright (C) 2001-2019 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 __fegetenv (fenv_t *envp)
  23 {
  24   __asm__ ("fnstenv %0\n"
  25            /* fnstenv changes the exception mask, so load back the
  26               stored environment.  */
  27            "fldenv %0\n"
  28            "stmxcsr %1" : "=m" (*envp), "=m" (envp->__mxcsr));
  29
  30   /* Success.  */
  31   return 0;
  32 }
  33 libm_hidden_def (__fegetenv)
  34 weak_alias (__fegetenv, fegetenv)
  35 libm_hidden_weak (fegetenv)