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
|
/* w_scalbf.c -- float version of w_scalb.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.
* ====================================================
*/
#ifndef lint
static char rcsid[] = "$FreeBSD$";
#endif
/*
* wrapper scalbf(float x, float fn) is provide for
* passing various standard test suite. One
* should use scalbn() instead.
*/
#include "math.h"
#include "math_private.h"
#include <errno.h>
#ifdef __STDC__
#ifdef _SCALB_INT
float scalbf(float x, int fn) /* wrapper scalbf */
#else
float scalbf(float x, float fn) /* wrapper scalbf */
#endif
#else
float scalbf(x,fn) /* wrapper scalbf */
#ifdef _SCALB_INT
float x; int fn;
#else
float x,fn;
#endif
#endif
{
#ifdef _IEEE_LIBM
return __ieee754_scalbf(x,fn);
#else
float z;
z = __ieee754_scalbf(x,fn);
if(_LIB_VERSION == _IEEE_) return z;
if(!(finitef(z)||isnanf(z))&&finitef(x)) {
/* scalbf overflow */
return (float)__kernel_standard((double)x,(double)fn,132);
}
if(z==(float)0.0&&z!=x) {
/* scalbf underflow */
return (float)__kernel_standard((double)x,(double)fn,133);
}
#ifndef _SCALB_INT
if(!finitef(fn)) errno = ERANGE;
#endif
return z;
#endif
}
|
