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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [i386/] [crtprec.c] - Blame information for rev 282

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1 282 jeremybenn
/*
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 * Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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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 3, or (at your option) any
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 * later version.
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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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 * Under Section 7 of GPL version 3, you are granted additional
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 * permissions described in the GCC Runtime Library Exception, version
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 * 3.1, as published by the Free Software Foundation.
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 *
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 * You should have received a copy of the GNU General Public License and
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 * a copy of the GCC Runtime Library Exception along with this program;
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 * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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 * <http://www.gnu.org/licenses/>.
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 */
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#if __PREC == 32
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 #define X87CW          (0 << 8)        /* Single precision (24 bits) */
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#elif __PREC == 64
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 #define X87CW          (2 << 8)        /* Double precision (53 bits) */
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#elif __PREC == 80
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 #define X87CW          (3 << 8)        /* Extended precision (64 bits) */
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#else
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 #error "Wrong precision requested."
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#endif
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#define X87CW_PCMASK    (3 << 8)
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static void __attribute__((constructor))
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set_precision (void)
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{
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  unsigned short int cwd;
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  asm volatile ("fstcw\t%0" : "=m" (cwd));
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  cwd &= ~X87CW_PCMASK;
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  cwd |= X87CW;
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  asm volatile ("fldcw\t%0" : : "m" (cwd));
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}

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