blob: 24e6eeb80158fe3c309159559c57299717e30033 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
/* wf_log.c -- float version of w_log.c.
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
/*
* wrapper logf(x)
*/
#include "fdlibm.h"
#if __OBSOLETE_MATH
#include <errno.h>
#ifdef __STDC__
float logf(float x) /* wrapper logf */
#else
float logf(x) /* wrapper logf */
float x;
#endif
{
#ifdef _IEEE_LIBM
return __ieee754_logf(x);
#else
float z;
z = __ieee754_logf(x);
if(_LIB_VERSION == _IEEE_ || isnan(x) || x > 0.0f) return z;
#ifndef HUGE_VAL
#define HUGE_VAL inf
double inf = 0.0;
SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */
#endif
if(x==0.0f) {
/* logf(0) */
errno = ERANGE;
return (float)-HUGE_VAL;
} else {
/* logf(x<0) */
errno = EDOM;
return nan("");
}
#endif
}
#ifdef _DOUBLE_IS_32BITS
#ifdef __STDC__
double log(double x)
#else
double log(x)
double x;
#endif
{
return (double) logf((float) x);
}
#endif /* defined(_DOUBLE_IS_32BITS) */
#endif /* __OBSOLETE_MATH */
|
