196263Sobrien/*
296263Sobrien * Copyright (C) 2001 Free Software Foundation, Inc.
396263Sobrien * Contributed by David S. Miller (davem@redhat.com)
496263Sobrien *
596263Sobrien * This file is free software; you can redistribute it and/or modify it
696263Sobrien * under the terms of the GNU General Public License as published by the
796263Sobrien * Free Software Foundation; either version 2, or (at your option) any
896263Sobrien * later version.
996263Sobrien *
1096263Sobrien * In addition to the permissions in the GNU General Public License, the
1196263Sobrien * Free Software Foundation gives you unlimited permission to link the
1296263Sobrien * compiled version of this file with other programs, and to distribute
1396263Sobrien * those programs without any restriction coming from the use of this
1496263Sobrien * file.  (The General Public License restrictions do apply in other
1596263Sobrien * respects; for example, they cover modification of the file, and
1696263Sobrien * distribution when not linked into another program.)
1796263Sobrien *
1896263Sobrien * This file is distributed in the hope that it will be useful, but
1996263Sobrien * WITHOUT ANY WARRANTY; without even the implied warranty of
2096263Sobrien * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
2196263Sobrien * General Public License for more details.
2296263Sobrien *
2396263Sobrien * You should have received a copy of the GNU General Public License
2496263Sobrien * along with this program; see the file COPYING.  If not, write to
25169689Skan * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
26169689Skan * Boston, MA 02110-1301, USA.
2796263Sobrien *
2896263Sobrien *    As a special exception, if you link this library with files
2996263Sobrien *    compiled with GCC to produce an executable, this does not cause
3096263Sobrien *    the resulting executable to be covered by the GNU General Public License.
3196263Sobrien *    This exception does not however invalidate any other reasons why
3296263Sobrien *    the executable file might be covered by the GNU General Public License.
3396263Sobrien */
3496263Sobrien
3596263Sobrien#define FPRS_NS		(1 << 22)	/* Non-Standard fpu results */
3696263Sobrien
3796263Sobrienstatic void __attribute__((constructor))
3896263Sobrienset_fast_math (void)
3996263Sobrien{
4096263Sobrien  unsigned int fsr;
4196263Sobrien
4296263Sobrien  /* This works for the 64-bit case because, even if 32-bit ld/st of
4396263Sobrien     the fsr register modified the upper 32-bit, the only thing up there
4496263Sobrien     are the 3 other condition codes which are "do not care" at the time
4596263Sobrien     that this runs.  */
4696263Sobrien
4796263Sobrien  __asm__("st %%fsr, %0"
4896263Sobrien	  : "=m" (fsr));
4996263Sobrien
5096263Sobrien  fsr |= FPRS_NS;
5196263Sobrien
5296263Sobrien  __asm__("ld %0, %%fsr"
5396263Sobrien	  : : "m" (fsr));
5496263Sobrien}
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