diff options
Diffstat (limited to 'src/regress/lib/libc/cephes/eexp.c')
-rw-r--r-- | src/regress/lib/libc/cephes/eexp.c | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/src/regress/lib/libc/cephes/eexp.c b/src/regress/lib/libc/cephes/eexp.c deleted file mode 100644 index 74f0d6adb3..0000000000 --- a/src/regress/lib/libc/cephes/eexp.c +++ /dev/null | |||
@@ -1,86 +0,0 @@ | |||
1 | /* $OpenBSD: eexp.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 | /* xexp.c */ | ||
20 | /* exponential function check routine */ | ||
21 | /* by Stephen L. Moshier. */ | ||
22 | |||
23 | |||
24 | #include "ehead.h" | ||
25 | |||
26 | void eexp( x, y ) | ||
27 | unsigned short *x, *y; | ||
28 | { | ||
29 | unsigned short num[NE], den[NE], x2[NE]; | ||
30 | long i; | ||
31 | unsigned short sign, expchk; | ||
32 | |||
33 | /* range reduction theory: x = i + f, 0<=f<1; | ||
34 | * e**x = e**i * e**f | ||
35 | * e**i = 2**(i/log 2). | ||
36 | * Let i/log2 = i1 + f1, 0<=f1<1. | ||
37 | * Then e**i = 2**i1 * 2**f1, so | ||
38 | * e**x = 2**i1 * e**(log 2 * f1) * e**f. | ||
39 | */ | ||
40 | if( ecmp(x, ezero) == 0 ) | ||
41 | { | ||
42 | emov( eone, y ); | ||
43 | return; | ||
44 | } | ||
45 | emov(x, x2); | ||
46 | expchk = x2[NE-1]; | ||
47 | sign = expchk & 0x8000; | ||
48 | x2[NE-1] &= 0x7fff; | ||
49 | |||
50 | /* Test for excessively large argument */ | ||
51 | expchk &= 0x7fff; | ||
52 | if( expchk > (EXONE + 15) ) | ||
53 | { | ||
54 | eclear( y ); | ||
55 | if( sign == 0 ) | ||
56 | einfin( y ); | ||
57 | return; | ||
58 | } | ||
59 | |||
60 | eifrac( x2, &i, num ); /* x = i + f */ | ||
61 | |||
62 | if( i != 0 ) | ||
63 | { | ||
64 | ltoe( &i, den ); /* floating point i */ | ||
65 | ediv( elog2, den, den ); /* i/log 2 */ | ||
66 | eifrac( den, &i, den ); /* i/log 2 = i1 + f1 */ | ||
67 | emul( elog2, den, den ); /* log 2 * f1 */ | ||
68 | eadd( den, num, x2 ); /* log 2 * f1 + f */ | ||
69 | } | ||
70 | |||
71 | /*x2[NE-1] -= 1;*/ | ||
72 | eldexp( x2, -1L, x2 ); /* divide by 2 */ | ||
73 | etanh( x2, x2 ); /* tanh( x/2 ) */ | ||
74 | eadd( x2, eone, num ); /* 1 + tanh */ | ||
75 | eneg( x2 ); | ||
76 | eadd( x2, eone, den ); /* 1 - tanh */ | ||
77 | ediv( den, num, y ); /* (1 + tanh)/(1 - tanh) */ | ||
78 | |||
79 | /*y[NE-1] += i;*/ | ||
80 | if( sign ) | ||
81 | { | ||
82 | ediv( y, eone, y ); | ||
83 | i = -i; | ||
84 | } | ||
85 | eldexp( y, i, y ); /* multiply by 2**i */ | ||
86 | } | ||