w_powf.c - vx32 - Local 9vx git repository for patches.
(HTM) git clone git://r-36.net/vx32
(DIR) Log
(DIR) Files
(DIR) Refs
---
w_powf.c (1802B)
---
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 #ifndef lint
17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_powf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
18 #endif
19
20 /*
21 * wrapper powf(x,y) return x**y
22 */
23
24 #include "math.h"
25 #include "math_private.h"
26
27
28 float
29 powf(float x, float y) /* wrapper powf */
30 {
31 #ifdef _IEEE_LIBM
32 return __ieee754_powf(x,y);
33 #else
34 float z;
35 z=__ieee754_powf(x,y);
36 if(_LIB_VERSION == _IEEE_|| isnanf(y)) return z;
37 if(isnanf(x)) {
38 if(y==(float)0.0)
39 /* powf(NaN,0.0) */
40 return (float)__kernel_standard((double)x,(double)y,142);
41 else
42 return z;
43 }
44 if(x==(float)0.0){
45 if(y==(float)0.0)
46 /* powf(0.0,0.0) */
47 return (float)__kernel_standard((double)x,(double)y,120);
48 if(finitef(y)&&y<(float)0.0)
49 /* powf(0.0,negative) */
50 return (float)__kernel_standard((double)x,(double)y,123);
51 return z;
52 }
53 if(!finitef(z)) {
54 if(finitef(x)&&finitef(y)) {
55 if(isnanf(z))
56 /* powf neg**non-int */
57 return (float)__kernel_standard((double)x,(double)y,124);
58 else
59 /* powf overflow */
60 return (float)__kernel_standard((double)x,(double)y,121);
61 }
62 }
63 if(z==(float)0.0&&finitef(x)&&finitef(y))
64 /* powf underflow */
65 return (float)__kernel_standard((double)x,(double)y,122);
66 return z;
67 #endif
68 }