5980be9b3c
This work is based in part on code from NetBSD libm, libc and kernel. The library is partly public domain and partly BSD-style licensed.
63 lines
1.5 KiB
C
63 lines
1.5 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.
|
|
* ====================================================
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: w_pow.c,v 1.7 2002/05/26 22:02:02 wiz Exp $");
|
|
#endif
|
|
|
|
/*
|
|
* wrapper pow(x,y) return x**y
|
|
*/
|
|
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
|
|
double
|
|
pow(double x, double y) /* wrapper pow */
|
|
{
|
|
#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)
|
|
return __kernel_standard(x,y,23); /* 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
|
|
}
|