gcc/config/alpha/crtfastmath.c

   1 /*
   2  * Copyright (C) 2001 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 2, or (at your option) any
   8  * later version.
   9  *
  10  * In addition to the permissions in the GNU General Public License, the
  11  * Free Software Foundation gives you unlimited permission to link the
  12  * compiled version of this file with other programs, and to distribute
  13  * those programs without any restriction coming from the use of this
  14  * file.  (The General Public License restrictions do apply in other
  15  * respects; for example, they cover modification of the file, and
  16  * distribution when not linked into another program.)
  17  *
  18  * This file is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; see the file COPYING.  If not, write to
  25  * the Free Software Foundation, 59 Temple Place - Suite 330,
  26  * Boston, MA 02111-1307, USA.
  27  *
  28  *    As a special exception, if you link this library with files
  29  *    compiled with GCC to produce an executable, this does not cause
  30  *    the resulting executable to be covered by the GNU General Public License.
  31  *    This exception does not however invalidate any other reasons why
  32  *    the executable file might be covered by the GNU General Public License.
  33  */
  34
  35 /* Assume OSF/1 compatible interfaces.  */
  36
  37 extern void __ieee_set_fp_control (unsigned long int);
  38
  39 #define IEEE_MAP_DMZ  (1UL<<12)       /* Map denorm inputs to zero */
  40 #define IEEE_MAP_UMZ  (1UL<<13)       /* Map underflowed outputs to zero */
  41
  42 static void __attribute__((constructor))
  43 set_fast_math (void)
  44 {
  45   __ieee_set_fp_control (IEEE_MAP_DMZ | IEEE_MAP_UMZ);
  46 }