71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
|
|
|
|
/* @(#)w_pow.c 5.2 93/10/01 */
|
|
/*
|
|
* ====================================================
|
|
* 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.
|
|
* ====================================================
|
|
*/
|
|
|
|
/*
|
|
* wrapper pow(x,y) return x**y
|
|
*/
|
|
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
|
|
#ifdef __STDC__
|
|
double __pow(double x, double y) /* wrapper pow */
|
|
#else
|
|
double __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_|| __isnan(y)) return z;
|
|
if(__isnan(x)) {
|
|
if(y==0.0)
|
|
return __kernel_standard(x,y,42); /* pow(NaN,0.0) */
|
|
else
|
|
return z;
|
|
}
|
|
if(x==0.0) {
|
|
if(y==0.0)
|
|
return __kernel_standard(x,y,20); /* pow(0.0,0.0) */
|
|
if(__finite(y)&&y<0.0) {
|
|
if (signbit (x) && signbit (z))
|
|
return __kernel_standard(x,y,23); /* pow(-0.0,negative) */
|
|
else
|
|
return __kernel_standard(x,y,43); /* pow(+0.0,negative) */
|
|
}
|
|
return z;
|
|
}
|
|
if(!__finite(z)) {
|
|
if(__finite(x)&&__finite(y)) {
|
|
if(__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&&__finite(x)&&__finite(y))
|
|
return __kernel_standard(x,y,22); /* pow underflow */
|
|
return z;
|
|
#endif
|
|
}
|
|
weak_alias (__pow, pow)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__pow, __powl)
|
|
weak_alias (__pow, powl)
|
|
#endif
|