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Diffstat (limited to 'src/regress/lib/libc/cephes/etanh.c')
-rw-r--r-- | src/regress/lib/libc/cephes/etanh.c | 70 |
1 files changed, 0 insertions, 70 deletions
diff --git a/src/regress/lib/libc/cephes/etanh.c b/src/regress/lib/libc/cephes/etanh.c deleted file mode 100644 index 4ac5ff1c21..0000000000 --- a/src/regress/lib/libc/cephes/etanh.c +++ /dev/null | |||
@@ -1,70 +0,0 @@ | |||
1 | /* $OpenBSD: etanh.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 | /* xtanh.c */ | ||
20 | /* hyperbolic tangent check routine */ | ||
21 | /* this subroutine is used by the exponential function routine */ | ||
22 | /* by Stephen L. Moshier. */ | ||
23 | |||
24 | |||
25 | |||
26 | #include "ehead.h" | ||
27 | |||
28 | |||
29 | void etanh( x, y ) | ||
30 | unsigned short *x, *y; | ||
31 | { | ||
32 | unsigned short e[NE], r[NE], j[NE], xx[NE], m2[NE]; | ||
33 | short i, n; | ||
34 | long lj; | ||
35 | |||
36 | emov( x, r ); | ||
37 | r[NE-1] &= (unsigned short )0x7fff; | ||
38 | if( ecmp(r, eone) >= 0 ) | ||
39 | { | ||
40 | /* tanh(x) = (exp(x) - exp(-x)) / (exp(x) + exp(-x)) | ||
41 | * Note eexp() calls xtanh, but with an argument less than (1 + log 2)/2. | ||
42 | */ | ||
43 | eexp( r, e ); | ||
44 | ediv( e, eone, r ); | ||
45 | esub( r, e, xx ); | ||
46 | eadd( r, e, j ); | ||
47 | ediv( j, xx, y ); | ||
48 | return; | ||
49 | } | ||
50 | |||
51 | emov( etwo, m2 ); | ||
52 | eneg( m2 ); | ||
53 | |||
54 | n = NBITS/8; /* Number of terms to do in the continued fraction */ | ||
55 | lj = 2 * n + 1; | ||
56 | ltoe( &lj, j ); | ||
57 | |||
58 | emov( j, e ); | ||
59 | emul( x, x, xx ); | ||
60 | |||
61 | /* continued fraction */ | ||
62 | for( i=0; i<n; i++) | ||
63 | { | ||
64 | ediv( e, xx, r ); | ||
65 | eadd( m2, j, j ); | ||
66 | eadd( r, j, e ); | ||
67 | } | ||
68 | |||
69 | ediv( e, x, y ); | ||
70 | } | ||