1
2
3 /* @(#)w_pow.c 5.2 93/10/01 */
4 /*
5 * ====================================================
6 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
7 *
8 * Developed at SunPro, 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 #include <LibConfig.h>
15 #include <sys/EfiCdefs.h>
16 #if defined(LIBM_SCCS) && !defined(lint)
17 __RCSID("$NetBSD: w_pow.c,v 1.7 2002/05/26 22:02:02 wiz Exp $");
18 #endif
19
20 /*
21 * wrapper pow(x,y) return x**y
22 */
23
24 #include "math.h"
25 #include "math_private.h"
26
27
28 double
pow(double x,double y)29 pow(double x, double y) /* wrapper pow */
30 {
31 #ifdef _IEEE_LIBM
32 return __ieee754_pow(x,y);
33 #else
34 double z;
35 z=__ieee754_pow(x,y);
36 if(_LIB_VERSION == _IEEE_|| isnan(y)) return z;
37 if(isnan(x)) {
38 if(y==0.0)
39 return __kernel_standard(x,y,42); /* pow(NaN,0.0) */
40 else
41 return z;
42 }
43 if(x==0.0){
44 if(y==0.0)
45 return __kernel_standard(x,y,20); /* pow(0.0,0.0) */
46 if(finite(y)&&y<0.0)
47 return __kernel_standard(x,y,23); /* pow(0.0,negative) */
48 return z;
49 }
50 if(!finite(z)) {
51 if(finite(x)&&finite(y)) {
52 if(isnan(z))
53 return __kernel_standard(x,y,24); /* pow neg**non-int */
54 else
55 return __kernel_standard(x,y,21); /* pow overflow */
56 }
57 }
58 if(z==0.0&&finite(x)&&finite(y))
59 return __kernel_standard(x,y,22); /* pow underflow */
60 return z;
61 #endif
62 }
63