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/build/pgo/js-input/bitops-3bit-bits-in-byte.html

http://github.com/zpao/v8monkey
HTML | 82 lines | 42 code | 16 blank | 24 comment | 0 complexity | a6b3618ce7fbeebeec93f8e710cbc740 MD5 | raw file
 1<!DOCTYPE html>
 2<head>
 3<!--
 4 Copyright (C) 2007 Apple Inc.  All rights reserved.
 5
 6 Redistribution and use in source and binary forms, with or without
 7 modification, are permitted provided that the following conditions
 8 are met:
 9 1. Redistributions of source code must retain the above copyright
10    notice, this list of conditions and the following disclaimer.
11 2. Redistributions in binary form must reproduce the above copyright
12    notice, this list of conditions and the following disclaimer in the
13    documentation and/or other materials provided with the distribution.
14
15 THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
16 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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26-->
27
28<title>SunSpider bitops-3bit-bits-in-byte</title>
29
30</head>
31
32<body>
33<h3>bitops-3bit-bits-in-byte</h3>
34<div id="console">
35</div>
36
37<script>
38
39var _sunSpiderStartDate = new Date();
40
41// Copyright (c) 2004 by Arthur Langereis (arthur_ext at domain xfinitegames, tld com
42
43// 1 op = 6 ANDs, 3 SHRs, 3 SHLs, 4 assigns, 2 ADDs
44// O(1)
45function fast3bitlookup(b) {
46var c, bi3b = 0xE994; // 0b1110 1001 1001 0100; // 3 2 2 1  2 1 1 0
47c  = 3 & (bi3b >> ((b << 1) & 14));
48c += 3 & (bi3b >> ((b >> 2) & 14));
49c += 3 & (bi3b >> ((b >> 5) & 6));
50return c;
51
52/*
53lir4,0xE994; 9 instructions, no memory access, minimal register dependence, 6 shifts, 2 adds, 1 inline assign
54rlwinmr5,r3,1,28,30
55rlwinmr6,r3,30,28,30
56rlwinmr7,r3,27,29,30
57rlwnmr8,r4,r5,30,31
58rlwnmr9,r4,r6,30,31
59rlwnmr10,r4,r7,30,31
60addr3,r8,r9
61addr3,r3,r10
62*/
63}
64
65
66function TimeFunc(func) {
67var x, y, t;
68for(var x=0; x<500; x++)
69for(var y=0; y<256; y++) func(y);
70}
71
72TimeFunc(fast3bitlookup);
73
74
75var _sunSpiderInterval = new Date() - _sunSpiderStartDate;
76
77document.getElementById("console").innerHTML = _sunSpiderInterval;
78</script>
79
80
81</body>
82</html>