|
|
/* @(#)w_pow.c 1.3 95/01/18 */
|
/*
|
* ====================================================
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
*
|
* Developed at SunSoft, a Sun Microsystems, Inc. business.
|
* Permission to use, copy, modify, and distribute this
|
* software is freely granted, provided that this notice
|
* is preserved.
|
* ====================================================
|
*/
|
|
/*
|
* wrapper ieee_pow(x,y) return x**y
|
*/
|
|
#include "fdlibm.h"
|
|
|
#ifdef __STDC__
|
double ieee_pow(double x, double y) /* wrapper pow */
|
#else
|
double ieee_pow(x,y) /* wrapper pow */
|
double x,y;
|
#endif
|
{
|
#ifdef _IEEE_LIBM
|
return __ieee754_pow(x,y);
|
#else
|
double z;
|
z=__ieee754_pow(x,y);
|
if(_LIB_VERSION == _IEEE_|| ieee_isnan(y)) return z;
|
if(ieee_isnan(x)) {
|
if(y==0.0)
|
return __kernel_standard(x,y,42); /* ieee_pow(NaN,0.0) */
|
else
|
return z;
|
}
|
if(x==0.0){
|
if(y==0.0)
|
return __kernel_standard(x,y,20); /* ieee_pow(0.0,0.0) */
|
if(ieee_finite(y)&&y<0.0)
|
return __kernel_standard(x,y,23); /* ieee_pow(0.0,negative) */
|
return z;
|
}
|
if(!ieee_finite(z)) {
|
if(ieee_finite(x)&&ieee_finite(y)) {
|
if(ieee_isnan(z))
|
return __kernel_standard(x,y,24); /* pow neg**non-int */
|
else
|
return __kernel_standard(x,y,21); /* pow overflow */
|
}
|
}
|
if(z==0.0&&ieee_finite(x)&&ieee_finite(y))
|
return __kernel_standard(x,y,22); /* pow underflow */
|
return z;
|
#endif
|
}
|
