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41 lines
1.3 KiB
C
41 lines
1.3 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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double _logb (double __x)
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{
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register double __val;
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#ifdef __GNUC__
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register double __junk;
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__asm __volatile__
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("fxtract\n\t"
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: "=t" (__junk), "=u" (__val) : "0" (__x));
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#else
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#pragma message ("REVIEW ME")
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__asm fld [__x];
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__asm fxtract;
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__asm fstp st(0);
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__asm fstp [__val];
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#endif /*__GNUC__*/
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return __val;
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}
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