1// Copyright 2009 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package math
6
7/*
8	Floating-point logarithm.
9*/
10
11// The original C code, the long comment, and the constants
12// below are from FreeBSD's /usr/src/lib/msun/src/e_log.c
13// and came with this notice.  The go code is a simpler
14// version of the original C.
15//
16// ====================================================
17// Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
18//
19// Developed at SunPro, a Sun Microsystems, Inc. business.
20// Permission to use, copy, modify, and distribute this
21// software is freely granted, provided that this notice
22// is preserved.
23// ====================================================
24//
25// __ieee754_log(x)
26// Return the logarithm of x
27//
28// Method :
29//   1. Argument Reduction: find k and f such that
30//			x = 2**k * (1+f),
31//	   where  sqrt(2)/2 < 1+f < sqrt(2) .
32//
33//   2. Approximation of log(1+f).
34//	Let s = f/(2+f) ; based on log(1+f) = log(1+s) - log(1-s)
35//		 = 2s + 2/3 s**3 + 2/5 s**5 + .....,
36//	     	 = 2s + s*R
37//      We use a special Reme algorithm on [0,0.1716] to generate
38//	a polynomial of degree 14 to approximate R.  The maximum error
39//	of this polynomial approximation is bounded by 2**-58.45. In
40//	other words,
41//		        2      4      6      8      10      12      14
42//	    R(z) ~ L1*s +L2*s +L3*s +L4*s +L5*s  +L6*s  +L7*s
43//	(the values of L1 to L7 are listed in the program) and
44//	    |      2          14          |     -58.45
45//	    | L1*s +...+L7*s    -  R(z) | <= 2
46//	    |                             |
47//	Note that 2s = f - s*f = f - hfsq + s*hfsq, where hfsq = f*f/2.
48//	In order to guarantee error in log below 1ulp, we compute log by
49//		log(1+f) = f - s*(f - R)		(if f is not too large)
50//		log(1+f) = f - (hfsq - s*(hfsq+R)).	(better accuracy)
51//
52//	3. Finally,  log(x) = k*Ln2 + log(1+f).
53//			    = k*Ln2_hi+(f-(hfsq-(s*(hfsq+R)+k*Ln2_lo)))
54//	   Here Ln2 is split into two floating point number:
55//			Ln2_hi + Ln2_lo,
56//	   where n*Ln2_hi is always exact for |n| < 2000.
57//
58// Special cases:
59//	log(x) is NaN with signal if x < 0 (including -INF) ;
60//	log(+INF) is +INF; log(0) is -INF with signal;
61//	log(NaN) is that NaN with no signal.
62//
63// Accuracy:
64//	according to an error analysis, the error is always less than
65//	1 ulp (unit in the last place).
66//
67// Constants:
68// The hexadecimal values are the intended ones for the following
69// constants. The decimal values may be used, provided that the
70// compiler will convert from decimal to binary accurately enough
71// to produce the hexadecimal values shown.
72
73// Log returns the natural logarithm of x.
74//
75// Special cases are:
76//	Log(+Inf) = +Inf
77//	Log(0) = -Inf
78//	Log(x < 0) = NaN
79//	Log(NaN) = NaN
80
81//extern log
82func libc_log(float64) float64
83
84func Log(x float64) float64 {
85	return libc_log(x)
86}
87
88func log(x float64) float64 {
89	const (
90		Ln2Hi = 6.93147180369123816490e-01 /* 3fe62e42 fee00000 */
91		Ln2Lo = 1.90821492927058770002e-10 /* 3dea39ef 35793c76 */
92		L1    = 6.666666666666735130e-01   /* 3FE55555 55555593 */
93		L2    = 3.999999999940941908e-01   /* 3FD99999 9997FA04 */
94		L3    = 2.857142874366239149e-01   /* 3FD24924 94229359 */
95		L4    = 2.222219843214978396e-01   /* 3FCC71C5 1D8E78AF */
96		L5    = 1.818357216161805012e-01   /* 3FC74664 96CB03DE */
97		L6    = 1.531383769920937332e-01   /* 3FC39A09 D078C69F */
98		L7    = 1.479819860511658591e-01   /* 3FC2F112 DF3E5244 */
99	)
100
101	// special cases
102	switch {
103	case IsNaN(x) || IsInf(x, 1):
104		return x
105	case x < 0:
106		return NaN()
107	case x == 0:
108		return Inf(-1)
109	}
110
111	// reduce
112	f1, ki := Frexp(x)
113	if f1 < Sqrt2/2 {
114		f1 *= 2
115		ki--
116	}
117	f := f1 - 1
118	k := float64(ki)
119
120	// compute
121	s := f / (2 + f)
122	s2 := s * s
123	s4 := s2 * s2
124	t1 := s2 * (L1 + s4*(L3+s4*(L5+s4*L7)))
125	t2 := s4 * (L2 + s4*(L4+s4*L6))
126	R := t1 + t2
127	hfsq := 0.5 * f * f
128	return k*Ln2Hi - ((hfsq - (s*(hfsq+R) + k*Ln2Lo)) - f)
129}
130