libm/nds32/fesetround.c

   1 /*
   2  * Copyright (C) 2016-2017 Andes Technology, Inc.
   3  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   4  */
   5
   6 /* Set current rounding direction.
   7    Copyright (C) 2004-2013 Free Software Foundation, Inc.
   8
   9    The GNU C Library is free software; you can redistribute it and/or
  10    modify it under the terms of the GNU Lesser General Public
  11    License as published by the Free Software Foundation; either
  12    version 2.1 of the License, or (at your option) any later version.
  13
  14    The GNU C Library is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    Lesser General Public License for more details.
  18
  19    You should have received a copy of the GNU Lesser General Public
  20    License along with the GNU C Library.  If not, see
  21    <http://www.gnu.org/licenses/>.  */
  22
  23 #include <fenv.h>
  24 #include <fpu_control.h>
  25
  26 int
  27 fesetround (int round)
  28 {
  29 #ifdef __NDS32_ABI_2FP_PLUS__
  30         fpu_control_t temp;
  31         if ((round & ~0x3) != 0)
  32           /* ROUND is no valid rounding mode.  */
  33                 return 1;
  34
  35         _FPU_GETCW (temp);
  36         temp = (temp & ~0x3) | round;
  37         _FPU_SETCW (temp);
  38         return 0;
  39 #else
  40         return (round != FE_TONEAREST);
  41 #endif
  42 }