fesetenv.c

来自「Glibc 2.3.2源代码(解压后有100多M)」· C语言 代码 · 共 44 行

/* Install given floating-point environment.
   Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Andreas Jaeger <[e-mail]>, 1998.

   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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <fenv.h>
#include <fpu_control.h>

int
fesetenv (const fenv_t *envp)
{
  fpu_control_t cw;

  /* Read first current state to flush fpu pipeline.  */
  _FPU_GETCW (cw);

  if (envp == FE_DFL_ENV)
    _FPU_SETCW (_FPU_DEFAULT);
  else if (envp == FE_NOMASK_ENV)
    _FPU_SETCW (_FPU_IEEE);
  else
    _FPU_SETCW (envp->__fp_control_register);

  /* Success.  */
  return 0;
}

libm_hidden_def (fesetenv)