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
|
/* ef_scalb.c -- float version of e_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.
* ====================================================
*/
#include "fdlibm.h"
#include <limits.h>
#ifdef _SCALB_INT
#ifdef __STDC__
float scalbf(float x, int fn)
#else
float scalbf(x,fn)
float x; int fn;
#endif
#else
#ifdef __STDC__
float scalbf(float x, float fn)
#else
float scalbf(x,fn)
float x, fn;
#endif
#endif
{
#ifdef _SCALB_INT
return scalbnf(x,fn);
#else
if (isnanf(x)||isnanf(fn)) return x*fn;
if (!finitef(fn)) {
if(fn>(float)0.0) return x*fn;
else return x/(-fn);
}
if (rintf(fn)!=fn) return (fn-fn)/(fn-fn);
#if INT_MAX > 65000
if ( fn > (float)65000.0) return scalbnf(x, 65000);
if (-fn > (float)65000.0) return scalbnf(x,-65000);
#else
if ( fn > (float)32000.0) return scalbnf(x, 32000);
if (-fn > (float)32000.0) return scalbnf(x,-32000);
#endif
return scalbnf(x,(int)fn);
#endif
}
|
