55 lines
2.1 KiB
C
55 lines
2.1 KiB
C
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/*
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* Copyright (C) 2001 Free Software Foundation, Inc.
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* Contributed by David S. Miller (davem@redhat.com)
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*
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* This file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* In addition to the permissions in the GNU General Public License, the
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* Free Software Foundation gives you unlimited permission to link the
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* compiled version of this file with other programs, and to distribute
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* those programs without any restriction coming from the use of this
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* file. (The General Public License restrictions do apply in other
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* respects; for example, they cover modification of the file, and
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* distribution when not linked into another program.)
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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* As a special exception, if you link this library with files
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* compiled with GCC to produce an executable, this does not cause
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* the resulting executable to be covered by the GNU General Public License.
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*/
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#define FPRS_NS (1 << 22) /* Non-Standard fpu results */
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static void __attribute__((constructor))
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set_fast_math (void)
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{
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unsigned int fsr;
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/* This works for the 64-bit case because, even if 32-bit ld/st of
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the fsr register modified the upper 32-bit, the only thing up there
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are the 3 other condition codes which are "do not care" at the time
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that this runs. */
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__asm__("st %%fsr, %0"
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: "=m" (fsr));
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fsr |= FPRS_NS;
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__asm__("ld %0, %%fsr"
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: : "m" (fsr));
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}
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