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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [config/] [sparc/] [crtfastmath.c] - Blame information for rev 827

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1 38 julius
/*
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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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