freebsd-dev/contrib/gcc/config/sparc/crtfastmath.c

55 lines
2.1 KiB
C

/*
* Copyright (C) 2001 Free Software Foundation, Inc.
* Contributed by David S. Miller (davem@redhat.com)
*
* This file 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.
*
* In addition to the permissions in the GNU General Public License, the
* Free Software Foundation gives you unlimited permission to link the
* compiled version of this file with other programs, and to distribute
* those programs without any restriction coming from the use of this
* file. (The General Public License restrictions do apply in other
* respects; for example, they cover modification of the file, and
* distribution when not linked into another program.)
*
* This file 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 this program; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* As a special exception, if you link this library with files
* compiled with GCC to produce an executable, this does not 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.
*/
#define FPRS_NS (1 << 22) /* Non-Standard fpu results */
static void __attribute__((constructor))
set_fast_math (void)
{
unsigned int fsr;
/* This works for the 64-bit case because, even if 32-bit ld/st of
the fsr register modified the upper 32-bit, the only thing up there
are the 3 other condition codes which are "do not care" at the time
that this runs. */
__asm__("st %%fsr, %0"
: "=m" (fsr));
fsr |= FPRS_NS;
__asm__("ld %0, %%fsr"
: : "m" (fsr));
}