Mercurial > ecos

comparison packages/language/c/libm/current/src/float/ieee754-api/wf_log10.c @ 3260:77f9d3253c3e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add: Complex number header and library (single and double precision floating point), port from Newlib. Add: Single precision floating point library, port from Newlib. [ Bugzilla 1001539 ]
author vae
date Sun, 25 Aug 2013 14:38:57 +0000
parents
children
comparison
equal deleted inserted replaced
3259:8ecac279f33c 3260:77f9d3253c3e
1 //===========================================================================
2 //
3 // w_log10.c
4 //
5 // Part of the standard mathematical function library
6 //
7 //===========================================================================
8 // ####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 2012 Free Software Foundation, Inc.
12 //
13 // eCos is free software; you can redistribute it and/or modify it under
14 // the terms of the GNU General Public License as published by the Free
15 // Software Foundation; either version 2 or (at your option) any later
16 // version.
17 //
18 // eCos is distributed in the hope that it will be useful, but WITHOUT
19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 // for more details.
22 //
23 // You should have received a copy of the GNU General Public License
24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26 //
27 // As a special exception, if other files instantiate templates or use
28 // macros or inline functions from this file, or you compile this file
29 // and link it with other works to produce a work based on this file,
30 // this file does not by itself cause the resulting work to be covered by
31 // the GNU General Public License. However the source code for this file
32 // must still be made available in accordance with section (3) of the GNU
33 // General Public License v2.
34 //
35 // This exception does not invalidate any other reasons why a work based
36 // on this file might be covered by the GNU General Public License.
37 // -------------------------------------------
38 // ####ECOSGPLCOPYRIGHTEND####
39 //===========================================================================
40 //#####DESCRIPTIONBEGIN####
41 //
42 // Author(s):
43 // Contributors: visar, ilijak
44 // Date: 2012-03-08
45 // Purpose:
46 // Description:
47 // Usage:
48 //
49 //####DESCRIPTIONEND####
50 //
51 //===========================================================================
52
53 // CONFIGURATION
54
55 #include <pkgconf/libm.h> // Configuration header
56
57 // Include the Math library?
58 #ifdef CYGPKG_LIBM
59
60 // Derived from code with the following copyright
61
62
63 /*
64 * ====================================================
65 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
66 *
67 * Developed at SunPro, a Sun Microsystems, Inc. business.
68 * Permission to use, copy, modify, and distribute this
69 * software is freely granted, provided that this notice
70 * is preserved.
71 * ====================================================
72 */
73
74 /*
75 * wrapper log10f(X)
76 */
77
78 #include "mathincl/fdlibm.h"
79
80 #ifdef __STDC__
81 float log10f(float x) /* wrapper log10f */
82 #else
83 float log10f(x) /* wrapper log10f */
84 float x;
85 #endif
86 {
87 #ifdef CYGSEM_LIBM_COMPAT_IEEE_ONLY
88 return __ieee754_log10f(x);
89 #else
90 float z;
91 cyg_uint32 compat_mode = cyg_libm_get_compat_mode();
92
93 z = __ieee754_log10f(x);
94 if(
95 #ifdef CYGOPT_LIBM_COMPAT_POSIX_IEEE
96 compat_mode == CYGNUM_LIBM_COMPAT_POSIX ||
97 #endif
98 compat_mode == CYGNUM_LIBM_COMPAT_IEEE || isnanf(x)) return z;
99 if(x<=0.0) {
100 if(x==0.0)
101 return __kernel_standard(x,x,18); /* log10(0) */
102 else
103 return __kernel_standard(x,x,19); /* log10(x<0) */
104 } else
105 return z;
106 #endif
107 }
108
109 #endif // ifdef CYGPKG_LIBM
110
111 // EOF wf_log10.c