70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* w_powf.c -- float version of w_pow.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include <sys/cdefs.h>
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#if defined(LIBM_SCCS) && !defined(lint)
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__RCSID("$NetBSD: w_powf.c,v 1.6 2002/05/26 22:02:02 wiz Exp $");
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#endif
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/*
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* wrapper powf(x,y) return x**y
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*/
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#include "math.h"
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#include "math_private.h"
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float
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powf(float x, float y) /* wrapper powf */
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{
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#ifdef _IEEE_LIBM
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return __ieee754_powf(x,y);
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#else
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float z;
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z=__ieee754_powf(x,y);
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if(_LIB_VERSION == _IEEE_|| isnanf(y)) return z;
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if(isnanf(x)) {
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if(y==(float)0.0)
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/* powf(NaN,0.0) */
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return (float)__kernel_standard((double)x,(double)y,142);
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else
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return z;
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}
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if(x==(float)0.0){
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if(y==(float)0.0)
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/* powf(0.0,0.0) */
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return (float)__kernel_standard((double)x,(double)y,120);
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if(finitef(y)&&y<(float)0.0)
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/* powf(0.0,negative) */
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return (float)__kernel_standard((double)x,(double)y,123);
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return z;
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}
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if(!finitef(z)) {
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if(finitef(x)&&finitef(y)) {
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if(isnanf(z))
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/* powf neg**non-int */
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return (float)__kernel_standard((double)x,(double)y,124);
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else
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/* powf overflow */
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return (float)__kernel_standard((double)x,(double)y,121);
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}
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}
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if(z==(float)0.0&&finitef(x)&&finitef(y))
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/* powf underflow */
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return (float)__kernel_standard((double)x,(double)y,122);
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return z;
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#endif
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}
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