1 /*
2 * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 #include "jni.h"
27 #include "AlphaMath.h"
28
29 JNIEXPORT unsigned char mul8table[256][256];
30 JNIEXPORT unsigned char div8table[256][256];
31
initAlphaTables()32 void initAlphaTables()
33 {
34 unsigned int i;
35 unsigned int j;
36
37 for (i = 1; i < 256; i++) { /* SCALE == (1 << 24) */
38 unsigned int inc = (i << 16) + (i<<8) + i; /* approx. SCALE * (i/255.0) */
39 unsigned int val = inc + (1 << 23); /* inc + SCALE*0.5 */
40 for (j = 1; j < 256; j++) {
41 mul8table[i][j] = (val >> 24); /* val / SCALE */
42 val += inc;
43 }
44 }
45
46 for (i = 1; i < 256; i++) {
47 unsigned int inc;
48 unsigned int val;
49 inc = 0xff;
50 inc = ((inc << 24) + i/2) / i;
51 val = (1 << 23);
52 for (j = 0; j < i; j++) {
53 div8table[i][j] = (val >> 24);
54 val += inc;
55 }
56 for (j = i; j < 256; j++) {
57 div8table[i][j] = 255;
58 }
59 }
60 }
61