[DCOMLAUNCH] Add a DcomLaunch service stub
[reactos.git] / sdk / lib / crt / math / i386 / ldexp.c
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 #include <math.h>
24 #include <float.h>
25
26 double ldexp (double value, int exp)
27 {
28 register double result;
29 #ifndef __GNUC__
30 register double __dy = (double)exp;
31 #endif
32
33 /* Check for value correctness
34 * and set errno if required
35 */
36 if (_isnan(value))
37 {
38 errno = EDOM;
39 }
40
41 #ifdef __GNUC__
42 asm ("fscale"
43 : "=t" (result)
44 : "0" (value), "u" ((double)exp)
45 : "1");
46 #else /* !__GNUC__ */
47 __asm
48 {
49 fld __dy
50 fld value
51 fscale
52 fstp result
53 }
54 #endif /* !__GNUC__ */
55 return result;
56 }
57