45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2001-2018 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 3, or (at your option) any
|
|
* later version.
|
|
*
|
|
* 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.
|
|
*
|
|
* Under Section 7 of GPL version 3, you are granted additional
|
|
* permissions described in the GCC Runtime Library Exception, version
|
|
* 3.1, as published by the Free Software Foundation.
|
|
*
|
|
* You should have received a copy of the GNU General Public License and
|
|
* a copy of the GCC Runtime Library Exception along with this program;
|
|
* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
* <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#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));
|
|
}
|