| /* |
| * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include "AlphaMath.h" |
| |
| unsigned char mul8table[256][256]; |
| unsigned char div8table[256][256]; |
| |
| void initAlphaTables() |
| { |
| unsigned int i; |
| unsigned int j; |
| |
| for (i = 1; i < 256; i++) { /* SCALE == (1 << 24) */ |
| unsigned int inc = (i << 16) + (i<<8) + i; /* approx. SCALE * (i/255.0) */ |
| unsigned int val = inc + (1 << 23); /* inc + SCALE*0.5 */ |
| for (j = 1; j < 256; j++) { |
| mul8table[i][j] = (val >> 24); /* val / SCALE */ |
| val += inc; |
| } |
| } |
| |
| for (i = 1; i < 256; i++) { |
| unsigned int inc; |
| unsigned int val; |
| inc = 0xff; |
| inc = ((inc << 24) + i/2) / i; |
| val = (1 << 23); |
| for (j = 0; j < i; j++) { |
| div8table[i][j] = (val >> 24); |
| val += inc; |
| } |
| for (j = i; j < 256; j++) { |
| div8table[i][j] = 255; |
| } |
| } |
| } |