1  /* Set current rounding direction.
       2     Copyright (C) 2022-2023 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     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <fenv.h>
      20  #include <fpu_control.h>
      21  
      22  int
      23  __fesetround (int round)
      24  {
      25    fpu_control_t cw;
      26  
      27    if ((round & ~_FPU_RC_MASK) != 0)
      28      /* ROUND is no valid rounding mode.  */
      29      return 1;
      30  
      31    /* Get current state.  */
      32    _FPU_GETCW (cw);
      33  
      34    /* Set rounding bits.  */
      35    cw &= ~_FPU_RC_MASK;
      36    cw |= round;
      37    /* Set new state.  */
      38    _FPU_SETCW (cw);
      39  
      40    return 0;
      41  }
      42  
      43  libm_hidden_def (__fesetround) weak_alias (__fesetround, fesetround)
      44  libm_hidden_weak (fesetround)