diff options
Diffstat (limited to 'src/regress/lib/libc/cephes/elog.c')
-rw-r--r-- | src/regress/lib/libc/cephes/elog.c | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/src/regress/lib/libc/cephes/elog.c b/src/regress/lib/libc/cephes/elog.c deleted file mode 100644 index 079cc754f4..0000000000 --- a/src/regress/lib/libc/cephes/elog.c +++ /dev/null | |||
@@ -1,110 +0,0 @@ | |||
1 | /* $OpenBSD: elog.c,v 1.1 2011/07/02 18:11:01 martynas Exp $ */ | ||
2 | |||
3 | /* | ||
4 | * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net> | ||
5 | * | ||
6 | * Permission to use, copy, modify, and distribute this software for any | ||
7 | * purpose with or without fee is hereby granted, provided that the above | ||
8 | * copyright notice and this permission notice appear in all copies. | ||
9 | * | ||
10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
17 | */ | ||
18 | |||
19 | /* xlog.c */ | ||
20 | /* natural logarithm */ | ||
21 | /* by Stephen L. Moshier. */ | ||
22 | |||
23 | #include "mconf.h" | ||
24 | #include "ehead.h" | ||
25 | |||
26 | |||
27 | |||
28 | void elog( x, y ) | ||
29 | unsigned short *x, *y; | ||
30 | { | ||
31 | unsigned short xx[NE], z[NE], a[NE], b[NE], t[NE], qj[NE]; | ||
32 | long ex; | ||
33 | int fex; | ||
34 | |||
35 | |||
36 | if( x[NE-1] & (unsigned short )0x8000 ) | ||
37 | { | ||
38 | eclear(y); | ||
39 | mtherr( "elog", DOMAIN ); | ||
40 | return; | ||
41 | } | ||
42 | if( ecmp( x, ezero ) == 0 ) | ||
43 | { | ||
44 | einfin( y ); | ||
45 | eneg(y); | ||
46 | mtherr( "elog", SING ); | ||
47 | return; | ||
48 | } | ||
49 | if( ecmp( x, eone ) == 0 ) | ||
50 | { | ||
51 | eclear( y ); | ||
52 | return; | ||
53 | } | ||
54 | |||
55 | /* range reduction: log x = log( 2**ex * m ) = ex * log2 + log m */ | ||
56 | efrexp( x, &fex, xx ); | ||
57 | /* | ||
58 | emov(x, xx ); | ||
59 | ex = xx[NX-1] & 0x7fff; | ||
60 | ex -= 0x3ffe; | ||
61 | xx[NX-1] = 0x3ffe; | ||
62 | */ | ||
63 | |||
64 | /* Adjust range to 1/sqrt(2), sqrt(2) */ | ||
65 | esqrt2[NE-1] -= 1; | ||
66 | if( ecmp( xx, esqrt2 ) < 0 ) | ||
67 | { | ||
68 | fex -= 1; | ||
69 | emul( xx, etwo, xx ); | ||
70 | } | ||
71 | esqrt2[NE-1] += 1; | ||
72 | |||
73 | esub( eone, xx, a ); | ||
74 | if( a[NE-1] == 0 ) | ||
75 | { | ||
76 | eclear( y ); | ||
77 | goto logdon; | ||
78 | } | ||
79 | eadd( eone, xx, b ); | ||
80 | ediv( b, a, y ); /* store (x-1)/(x+1) in y */ | ||
81 | |||
82 | emul( y, y, z ); | ||
83 | |||
84 | emov( eone, a ); | ||
85 | emov( eone, b ); | ||
86 | emov( eone, qj ); | ||
87 | do | ||
88 | { | ||
89 | eadd( etwo, qj, qj ); /* 2 * i + 1 */ | ||
90 | emul( z, a, a ); | ||
91 | ediv( qj, a, t ); | ||
92 | eadd( t, b, b ); | ||
93 | } | ||
94 | while( ((b[NE-1] & 0x7fff) - (t[NE-1] & 0x7fff)) < NBITS ); | ||
95 | |||
96 | |||
97 | emul( b, y, y ); | ||
98 | emul( y, etwo, y ); | ||
99 | |||
100 | logdon: | ||
101 | |||
102 | /* now add log of 2**ex */ | ||
103 | if( fex != 0 ) | ||
104 | { | ||
105 | ex = fex; | ||
106 | ltoe( &ex, b ); | ||
107 | emul( elog2, b, b ); | ||
108 | eadd( b, y, y ); | ||
109 | } | ||
110 | } | ||