uclibc-ng/libm/mips/fesetround.c

/* Set current rounding direction.
   Copyright (C) 1998-2025 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>

int
fesetround (int round)
{
  fpu_control_t cw;

  if ((round & ~_FPU_RC_MASK) != 0)
    /* ROUND is no valid rounding mode.  */
    return 1;

  /* Get current state.  */
  _FPU_GETCW (cw);

  /* Set rounding bits.  */
  cw &= ~_FPU_RC_MASK;
  cw |= round;
  /* Set new state.  */
  _FPU_SETCW (cw);

  return 0;
}