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glibc/math/w_powf.c
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| /* w_powf.c -- float version of w_pow.c. | |
| * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. | |
| */ | |
| /* | |
| * ==================================================== | |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |
| * | |
| * Developed at SunPro, a Sun Microsystems, Inc. business. | |
| * Permission to use, copy, modify, and distribute this | |
| * software is freely granted, provided that this notice | |
| * is preserved. | |
| * ==================================================== | |
| */ | |
| #if defined(LIBM_SCCS) && !defined(lint) | |
| static char rcsid[] = "$NetBSD: w_powf.c,v 1.3 1995/05/10 20:49:41 jtc Exp $"; | |
| #endif | |
| /* | |
| * wrapper powf(x,y) return x**y | |
| */ | |
| #include "math.h" | |
| #include "math_private.h" | |
| #ifdef __STDC__ | |
| float __powf(float x, float y) /* wrapper powf */ | |
| #else | |
| float __powf(x,y) /* wrapper powf */ | |
| float x,y; | |
| #endif | |
| { | |
| #ifdef _IEEE_LIBM | |
| return __ieee754_powf(x,y); | |
| #else | |
| float z; | |
| z=__ieee754_powf(x,y); | |
| if(_LIB_VERSION == _IEEE_|| __isnanf(y)) return z; | |
| if(__isnanf(x)) { | |
| if(y==(float)0.0) | |
| /* powf(NaN,0.0) */ | |
| return (float)__kernel_standard((double)x,(double)y,142); | |
| else | |
| return z; | |
| } | |
| if(x==(float)0.0) { | |
| if(y==(float)0.0) | |
| /* powf(0.0,0.0) */ | |
| return (float)__kernel_standard((double)x,(double)y,120); | |
| if(__finitef(y)&&y<(float)0.0) { | |
| if (signbit (x) && signbit (z)) | |
| /* powf(0.0,negative) */ | |
| return (float)__kernel_standard((double)x,(double)y,123); | |
| else | |
| return (float)__kernel_standard((double)x,(double)y,143); | |
| } | |
| return z; | |
| } | |
| if(!__finitef(z)) { | |
| if(__finitef(x)&&__finitef(y)) { | |
| if(__isnanf(z)) | |
| /* powf neg**non-int */ | |
| return (float)__kernel_standard((double)x,(double)y,124); | |
| else | |
| /* powf overflow */ | |
| return (float)__kernel_standard((double)x,(double)y,121); | |
| } | |
| } | |
| if(z==(float)0.0&&__finitef(x)&&__finitef(y)) | |
| /* powf underflow */ | |
| return (float)__kernel_standard((double)x,(double)y,122); | |
| return z; | |
| #endif | |
| } | |
| weak_alias (__powf, powf) |