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logb.c
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1 /* Math functions for i387.
2  Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
3  This file is part of the GNU C Library.
4  Contributed by John C. Bowman <bowman@ipp-garching.mpg.de>, 1995.
5 
6  The GNU C Library is free software; you can redistribute it and/or
7  modify it under the terms of the GNU Lesser General Public
8  License as published by the Free Software Foundation; either
9  version 2.1 of the License, or (at your option) any later version.
10 
11  The GNU C Library is distributed in the hope that it will be useful,
12  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  Lesser General Public License for more details.
15 
16  You should have received a copy of the GNU Lesser General Public
17  License along with the GNU C Library; if not, write to the Free
18  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19  Boston, MA 02110-1301, USA.
20 */
21 
22 #include <precomp.h>
23 
24 double _logb (double __x)
25 {
26  register double __val;
27 #ifdef __GNUC__
28  register double __junk;
29  __asm __volatile__
30  ("fxtract\n\t"
31  : "=t" (__junk), "=u" (__val) : "0" (__x));
32 #else
33 #pragma message ("REVIEW ME")
34  __asm fld [__x];
35  __asm fxtract;
36  __asm fstp st(0);
37  __asm fstp [__val];
38 #endif /*__GNUC__*/
39  return __val;
40 }
_STLP_INLINE_LOOP _InputIter const _Tp & __val
Definition: _algobase.h:656
double _logb(double __x)
Definition: logb.c:24