1
2
3/* @(#)w_pow.c 5.2 93/10/01 */
4/*
5 * ====================================================
6 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
7 *
8 * Developed at SunPro, a Sun Microsystems, Inc. business.
9 * Permission to use, copy, modify, and distribute this
10 * software is freely granted, provided that this notice
11 * is preserved.
12 * ====================================================
13 */
14#include  <LibConfig.h>
15#include  <sys/EfiCdefs.h>
16#if defined(LIBM_SCCS) && !defined(lint)
17__RCSID("$NetBSD: w_pow.c,v 1.7 2002/05/26 22:02:02 wiz Exp $");
18#endif
19
20/*
21 * wrapper pow(x,y) return x**y
22 */
23
24#include "math.h"
25#include "math_private.h"
26
27
28double
29pow(double x, double y) /* wrapper pow */
30{
31#ifdef _IEEE_LIBM
32  return  __ieee754_pow(x,y);
33#else
34  double z;
35  z=__ieee754_pow(x,y);
36  if(_LIB_VERSION == _IEEE_|| isnan(y)) return z;
37  if(isnan(x)) {
38      if(y==0.0)
39          return __kernel_standard(x,y,42); /* pow(NaN,0.0) */
40      else
41    return z;
42  }
43  if(x==0.0){
44      if(y==0.0)
45          return __kernel_standard(x,y,20); /* pow(0.0,0.0) */
46      if(finite(y)&&y<0.0)
47          return __kernel_standard(x,y,23); /* pow(0.0,negative) */
48      return z;
49  }
50  if(!finite(z)) {
51      if(finite(x)&&finite(y)) {
52          if(isnan(z))
53              return __kernel_standard(x,y,24); /* pow neg**non-int */
54          else
55              return __kernel_standard(x,y,21); /* pow overflow */
56      }
57  }
58  if(z==0.0&&finite(x)&&finite(y))
59      return __kernel_standard(x,y,22); /* pow underflow */
60  return z;
61#endif
62}
63