1
2/* @(#)e_log.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 */
13#include  <LibConfig.h>
14#include  <sys/EfiCdefs.h>
15#if defined(LIBM_SCCS) && !defined(lint)
16__RCSID("$NetBSD: e_log2.c,v 1.1 2005/07/21 12:55:58 christos Exp $");
17#endif
18
19#include "math.h"
20#include "math_private.h"
21
22#if defined(_MSC_VER)           /* Handle Microsoft VC++ compiler specifics. */
23  // potential divide by 0 -- near line 53, (x-x)/zero is on purpose
24  #pragma warning ( disable : 4723 )
25#endif
26
27static const double
28ln2 = 0.6931471805599452862268,
29two54   =  1.80143985094819840000e+16,  /* 43500000 00000000 */
30Lg1 = 6.666666666666735130e-01,  /* 3FE55555 55555593 */
31Lg2 = 3.999999999940941908e-01,  /* 3FD99999 9997FA04 */
32Lg3 = 2.857142874366239149e-01,  /* 3FD24924 94229359 */
33Lg4 = 2.222219843214978396e-01,  /* 3FCC71C5 1D8E78AF */
34Lg5 = 1.818357216161805012e-01,  /* 3FC74664 96CB03DE */
35Lg6 = 1.531383769920937332e-01,  /* 3FC39A09 D078C69F */
36Lg7 = 1.479819860511658591e-01;  /* 3FC2F112 DF3E5244 */
37
38static const double zero   =  0.0;
39
40double
41__ieee754_log2(double x)
42{
43  double hfsq,f,s,z,R,w,t1,t2,dk;
44  int32_t k,hx,i,j;
45  u_int32_t lx;
46
47  EXTRACT_WORDS(hx,lx,x);
48
49  k=0;
50  if (hx < 0x00100000) {      /* x < 2**-1022  */
51      if (((hx&0x7fffffff)|lx)==0)
52    return -two54/zero;   /* log(+-0)=-inf */
53      if (hx<0) return (x-x)/zero;  /* log(-#) = NaN */
54      k -= 54; x *= two54; /* subnormal number, scale up x */
55      GET_HIGH_WORD(hx,x);
56  }
57  if (hx >= 0x7ff00000) return x+x;
58  k += (hx>>20)-1023;
59  hx &= 0x000fffff;
60  i = (hx+0x95f64)&0x100000;
61  SET_HIGH_WORD(x,hx|(i^0x3ff00000)); /* normalize x or x/2 */
62  k += (i>>20);
63  f = x-1.0;
64  dk = (double)k;
65  if((0x000fffff&(2+hx))<3) { /* |f| < 2**-20 */
66      if (f==zero)
67        return (dk);
68      R = f*f*(0.5-0.33333333333333333*f);
69      return (dk-(R-f)/ln2);
70  }
71  s = f/(2.0+f);
72  z = s*s;
73  i = hx-0x6147a;
74  w = z*z;
75  j = 0x6b851-hx;
76  t1= w*(Lg2+w*(Lg4+w*Lg6));
77  t2= z*(Lg1+w*(Lg3+w*(Lg5+w*Lg7)));
78  i |= j;
79  R = t2+t1;
80  if(i>0) {
81      hfsq=0.5*f*f;
82      return (dk-(hfsq-s*(hfsq+R)-f)/ln2);
83  } else
84    return (dk-((s*(f-R))-f)/ln2);
85}
86