gcc/config/ia64/crtfastmath.c

   1 /* Copyright (C) 2001, 2005, 2009 Free Software Foundation, Inc.
   2    Contributed by David Mosberger <davidm@hpl.hp.com>.
   3
   4    This file is part of GCC.
   5
   6    GCC is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    GCC is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    Under Section 7 of GPL version 3, you are granted additional
  17    permissions described in the GCC Runtime Library Exception, version
  18    3.1, as published by the Free Software Foundation.
  19
  20    You should have received a copy of the GNU General Public License and
  21    a copy of the GCC Runtime Library Exception along with this program;
  22    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23    <http://www.gnu.org/licenses/>.  */
  24
  25 /* We could call fesetenv() here but that would create a confusing
  26    dependency on libm (since that is where fesetenv() gets defined.
  27    To avoid this, just do everything locally.  */
  28 #define FE_NONIEEE_ENV 0x0009a04d0270037f
  29
  30 static void __attribute__((constructor))
  31 __ia64_set_fast_math (void)
  32 {
  33   __asm__ __volatile__ ("mov.m ar.fpsr=%0" : : "r"(FE_NONIEEE_ENV));
  34 }