libgcc/config/alpha/crtfastmath.c

   1 /*
   2  * Copyright (C) 2001-2018 Free Software Foundation, Inc.
   3  * Contributed by Richard Henderson (rth@redhat.com)
   4  *
   5  * This file is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 3, or (at your option) any
   8  * later version.
   9  *
  10  * This file is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * Under Section 7 of GPL version 3, you are granted additional
  16  * permissions described in the GCC Runtime Library Exception, version
  17  * 3.1, as published by the Free Software Foundation.
  18  *
  19  * You should have received a copy of the GNU General Public License and
  20  * a copy of the GCC Runtime Library Exception along with this program;
  21  * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22  * <http://www.gnu.org/licenses/>.
  23  */
  24
  25 /* Assume OSF/1 compatible interfaces.  */
  26
  27 extern void __ieee_set_fp_control (unsigned long int);
  28
  29 #define IEEE_MAP_DMZ  (1UL<<12)       /* Map denorm inputs to zero */
  30 #define IEEE_MAP_UMZ  (1UL<<13)       /* Map underflowed outputs to zero */
  31
  32 static void __attribute__((constructor))
  33 set_fast_math (void)
  34 {
  35   __ieee_set_fp_control (IEEE_MAP_DMZ | IEEE_MAP_UMZ);
  36 }