1 /* w_powf.c -- float version of w_pow.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5 /*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16 #include <sys/cdefs.h>
17 #if defined(LIBM_SCCS) && !defined(lint)
18 __RCSID("$NetBSD: w_powf.c,v 1.6 2002/05/26 22:02:02 wiz Exp $");
19 #endif
20
21 /*
22 * wrapper powf(x,y) return x**y
23 */
24
25 #include "math.h"
26 #include "math_private.h"
27
28
29 float
powf(float x,float y)30 powf(float x, float y) /* wrapper powf */
31 {
32 #ifdef _IEEE_LIBM
33 return __ieee754_powf(x,y);
34 #else
35 float z;
36 z=__ieee754_powf(x,y);
37 if(_LIB_VERSION == _IEEE_|| isnanf(y)) return z;
38 if(isnanf(x)) {
39 if(y==(float)0.0)
40 /* powf(NaN,0.0) */
41 return (float)__kernel_standard((double)x,(double)y,142);
42 else
43 return z;
44 }
45 if(x==(float)0.0){
46 if(y==(float)0.0)
47 /* powf(0.0,0.0) */
48 return (float)__kernel_standard((double)x,(double)y,120);
49 if(finitef(y)&&y<(float)0.0)
50 /* powf(0.0,negative) */
51 return (float)__kernel_standard((double)x,(double)y,123);
52 return z;
53 }
54 if(!finitef(z)) {
55 if(finitef(x)&&finitef(y)) {
56 if(isnanf(z))
57 /* powf neg**non-int */
58 return (float)__kernel_standard((double)x,(double)y,124);
59 else
60 /* powf overflow */
61 return (float)__kernel_standard((double)x,(double)y,121);
62 }
63 }
64 if(z==(float)0.0&&finitef(x)&&finitef(y))
65 /* powf underflow */
66 return (float)__kernel_standard((double)x,(double)y,122);
67 return z;
68 #endif
69 }
70