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 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