Viewing file:  crtfastmath.c (1.51 KB) -rw-r--r--
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/*
* Copyright (C) 2001-2022 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));
}
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