sysdeps/ia64/fpu/fesetround.c

   1 /* Set current rounding direction.
   2    Copyright (C) 1999-2024 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
  21 int
  22 __fesetround (int round)
  23 {
  24   fenv_t fpsr;
  25
  26   if (round & ~3)
  27     return 1;
  28
  29   /* Get the current state.  */
  30   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (fpsr));
  31
  32   /* Set the relevant bits.  */
  33   fpsr = (fpsr & ~(3UL << 10)) | ((fenv_t) round << 10);
  34
  35   /* Put the new state in effect.  */
  36   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (fpsr) : "memory");
  37
  38   return 0;
  39 }
  40 libm_hidden_def (__fesetround)
  41 weak_alias (__fesetround, fesetround)
  42 libm_hidden_weak (fesetround)