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58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* Math functions for i387.
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Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by John C. Bowman <bowman@ipp-garching.mpg.de>, 1995.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <precomp.h>
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#include <math.h>
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#include <float.h>
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double ldexp (double value, int exp)
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{
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register double result;
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#ifndef __GNUC__
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register double __dy = (double)exp;
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#endif
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/* Check for value correctness
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* and set errno if required
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*/
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if (_isnan(value))
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{
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errno = EDOM;
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}
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#ifdef __GNUC__
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asm ("fscale"
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: "=t" (result)
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: "0" (value), "u" ((double)exp)
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: "1");
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#else /* !__GNUC__ */
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__asm
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{
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fld __dy
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fld value
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fscale
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fstp result
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}
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#endif /* !__GNUC__ */
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return result;
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}
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