uclibc-ng/libm/csky/feupdateenv.c

/* Install given floating-point environment and raise exceptions.
   Copyright (C) 2018-2025 Free Software Foundation, Inc.

   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
   <https://www.gnu.org/licenses/>.  */

#include <fenv.h>
#include <fpu_control.h>
#include "fenv_libc.h"
#include "fenv_private.h"
#include <stdio.h>

int
feupdateenv (const fenv_t *envp)
{
  int temp;

  /* Save current exceptions.  */
  _FPU_GETFPSR (temp);
  temp = (temp >> CAUSE_SHIFT) & FE_ALL_EXCEPT;
  /* Install new environment.  */
  fesetenv (envp);

  /* Raise the saved exception.  Incidentally for us the implementation
     defined format of the values in objects of type fexcept_t is the
     same as the ones specified using the FE_* constants.  */
  feraiseexcept (temp);

  /* Success.  */
  return 0;
}