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Diffstat (limited to 'src/regress/lib/libc/cephes/epow.c')
-rw-r--r-- | src/regress/lib/libc/cephes/epow.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/src/regress/lib/libc/cephes/epow.c b/src/regress/lib/libc/cephes/epow.c deleted file mode 100644 index 646268fce7..0000000000 --- a/src/regress/lib/libc/cephes/epow.c +++ /dev/null | |||
@@ -1,187 +0,0 @@ | |||
1 | /* $OpenBSD: epow.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 | /* epow.c */ | ||
20 | /* power function: z = x**y */ | ||
21 | /* by Stephen L. Moshier. */ | ||
22 | |||
23 | |||
24 | #include "ehead.h" | ||
25 | |||
26 | extern int rndprc; | ||
27 | void epowi(); | ||
28 | |||
29 | void epow( x, y, z ) | ||
30 | unsigned short *x, *y, *z; | ||
31 | { | ||
32 | unsigned short w[NE]; | ||
33 | int rndsav; | ||
34 | long li; | ||
35 | |||
36 | efloor( y, w ); | ||
37 | if( ecmp(y,w) == 0 ) | ||
38 | { | ||
39 | eifrac( y, &li, w ); | ||
40 | if( li < 0 ) | ||
41 | li = -li; | ||
42 | if( (li < 0x7fffffff) && (li != 0x80000000) ) | ||
43 | { | ||
44 | epowi( x, y, z ); | ||
45 | return; | ||
46 | } | ||
47 | } | ||
48 | /* z = exp( y * log(x) ) */ | ||
49 | rndsav = rndprc; | ||
50 | rndprc = NBITS; | ||
51 | elog( x, w ); | ||
52 | emul( y, w, w ); | ||
53 | eexp( w, z ); | ||
54 | rndprc = rndsav; | ||
55 | emul( eone, z, z ); | ||
56 | } | ||
57 | |||
58 | |||
59 | /* y is integer valued. */ | ||
60 | |||
61 | void epowi( x, y, z ) | ||
62 | unsigned short x[], y[], z[]; | ||
63 | { | ||
64 | unsigned short w[NE]; | ||
65 | long li, lx; | ||
66 | unsigned long lu; | ||
67 | int rndsav; | ||
68 | unsigned short signx; | ||
69 | /* unsigned short signy; */ | ||
70 | |||
71 | rndsav = rndprc; | ||
72 | eifrac( y, &li, w ); | ||
73 | if( li < 0 ) | ||
74 | lx = -li; | ||
75 | else | ||
76 | lx = li; | ||
77 | |||
78 | if( (lx == 0x7fffffff) || (lx == 0x80000000) ) | ||
79 | { | ||
80 | epow( x, y, z ); | ||
81 | goto done; | ||
82 | } | ||
83 | |||
84 | if( (x[NE-1] & (unsigned short )0x7fff) == 0 ) | ||
85 | { | ||
86 | if( li == 0 ) | ||
87 | { | ||
88 | emov( eone, z ); | ||
89 | return; | ||
90 | } | ||
91 | else if( li < 0 ) | ||
92 | { | ||
93 | einfin( z ); | ||
94 | return; | ||
95 | } | ||
96 | else | ||
97 | { | ||
98 | eclear( z ); | ||
99 | return; | ||
100 | } | ||
101 | } | ||
102 | |||
103 | if( li == 0L ) | ||
104 | { | ||
105 | emov( eone, z ); | ||
106 | return; | ||
107 | } | ||
108 | |||
109 | emov( x, w ); | ||
110 | signx = w[NE-1] & (unsigned short )0x8000; | ||
111 | w[NE-1] &= (unsigned short )0x7fff; | ||
112 | |||
113 | /* Overflow detection */ | ||
114 | /* | ||
115 | lx = li * (w[NE-1] - 0x3fff); | ||
116 | if( lx > 16385L ) | ||
117 | { | ||
118 | einfin( z ); | ||
119 | mtherr( "epowi", OVERFLOW ); | ||
120 | goto done; | ||
121 | } | ||
122 | if( lx < -16450L ) | ||
123 | { | ||
124 | eclear( z ); | ||
125 | return; | ||
126 | } | ||
127 | */ | ||
128 | rndprc = NBITS; | ||
129 | |||
130 | if( li < 0 ) | ||
131 | { | ||
132 | lu = (unsigned int )( -li ); | ||
133 | /* signy = 0xffff;*/ | ||
134 | ediv( w, eone, w ); | ||
135 | } | ||
136 | else | ||
137 | { | ||
138 | lu = (unsigned int )li; | ||
139 | /* signy = 0;*/ | ||
140 | } | ||
141 | |||
142 | /* First bit of the power */ | ||
143 | if( lu & 1 ) | ||
144 | { | ||
145 | emov( w, z ); | ||
146 | } | ||
147 | else | ||
148 | { | ||
149 | emov( eone, z ); | ||
150 | signx = 0; | ||
151 | } | ||
152 | |||
153 | |||
154 | lu >>= 1; | ||
155 | while( lu != 0L ) | ||
156 | { | ||
157 | emul( w, w, w ); /* arg to the 2-to-the-kth power */ | ||
158 | if( lu & 1L ) /* if that bit is set, then include in product */ | ||
159 | emul( w, z, z ); | ||
160 | lu >>= 1; | ||
161 | } | ||
162 | |||
163 | |||
164 | done: | ||
165 | |||
166 | if( signx ) | ||
167 | eneg( z ); /* odd power of negative number */ | ||
168 | |||
169 | /* | ||
170 | if( signy ) | ||
171 | { | ||
172 | if( ecmp( z, ezero ) != 0 ) | ||
173 | { | ||
174 | ediv( z, eone, z ); | ||
175 | } | ||
176 | else | ||
177 | { | ||
178 | einfin( z ); | ||
179 | printf( "epowi OVERFLOW\n" ); | ||
180 | } | ||
181 | } | ||
182 | */ | ||
183 | rndprc = rndsav; | ||
184 | emul( eone, z, z ); | ||
185 | } | ||
186 | |||
187 | |||