986
|
1 |
|
|
2 |
|
|
3 |
/* @(#)w_pow.c 1.3 95/01/18 */
|
|
4 |
/*
|
|
5 |
* ====================================================
|
|
6 |
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
7 |
*
|
|
8 |
* Developed at SunSoft, a Sun Microsystems, Inc. business.
|
|
9 |
* Permission to use, copy, modify, and distribute this
|
|
10 |
* software is freely granted, provided that this notice
|
|
11 |
* is preserved.
|
|
12 |
* ====================================================
|
|
13 |
*/
|
|
14 |
|
|
15 |
/*
|
|
16 |
* wrapper pow(x,y) return x**y
|
|
17 |
*/
|
|
18 |
|
|
19 |
#include "fdlibm.h"
|
|
20 |
|
|
21 |
|
|
22 |
#ifdef __STDC__
|
|
23 |
double pow(double x, double y) /* wrapper pow */
|
|
24 |
#else
|
|
25 |
double pow(x,y) /* wrapper pow */
|
|
26 |
double x,y;
|
|
27 |
#endif
|
|
28 |
{
|
|
29 |
#ifdef _IEEE_LIBM
|
|
30 |
return __ieee754_pow(x,y);
|
|
31 |
#else
|
|
32 |
double z;
|
|
33 |
z=__ieee754_pow(x,y);
|
|
34 |
if(_LIB_VERSION == _IEEE_|| isnan(y)) return z;
|
|
35 |
if(isnan(x)) {
|
|
36 |
if(y==0.0)
|
|
37 |
return __kernel_standard(x,y,42); /* pow(NaN,0.0) */
|
|
38 |
else
|
|
39 |
return z;
|
|
40 |
}
|
|
41 |
if(x==0.0){
|
|
42 |
if(y==0.0)
|
|
43 |
return __kernel_standard(x,y,20); /* pow(0.0,0.0) */
|
|
44 |
if(finite(y)&&y<0.0)
|
|
45 |
return __kernel_standard(x,y,23); /* pow(0.0,negative) */
|
|
46 |
return z;
|
|
47 |
}
|
|
48 |
if(!finite(z)) {
|
|
49 |
if(finite(x)&&finite(y)) {
|
|
50 |
if(isnan(z))
|
|
51 |
return __kernel_standard(x,y,24); /* pow neg**non-int */
|
|
52 |
else
|
|
53 |
return __kernel_standard(x,y,21); /* pow overflow */
|
|
54 |
}
|
|
55 |
}
|
|
56 |
if(z==0.0&&finite(x)&&finite(y))
|
|
57 |
return __kernel_standard(x,y,22); /* pow underflow */
|
|
58 |
return z;
|
|
59 |
#endif
|
|
60 |
}
|