llvm-gcc-4.2/gcc/config/ia64/crtfastmath.c

/* Copyright (C) 2001, 2005 Free Software Foundation, Inc.
   Contributed by David Mosberger <davidm@hpl.hp.com>.

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   GCC is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GCC; see the file COPYING.  If not, write to
   the Free Software Foundation, 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */

/* As a special exception, if you link this library with other files,
   some of which are compiled with GCC, to produce an executable,
   this library does not by itself cause the resulting executable
   to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public License.  */

/* We could call fesetenv() here but that would create a confusing
   dependency on libm (since that is where fesetenv() gets defined.
   To avoid this, just do everything locally.  */
#define FE_NONIEEE_ENV 0x0009a04d0270037f

static void __attribute__((constructor))
__ia64_set_fast_math (void)
{
  __asm__ __volatile__ ("mov.m ar.fpsr=%0" : : "r"(FE_NONIEEE_ENV));
}