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83 lines
2.4 KiB
HTML
83 lines
2.4 KiB
HTML
<!DOCTYPE html>
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<head>
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<!--
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Copyright (C) 2007 Apple Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-->
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<title>SunSpider bitops-3bit-bits-in-byte</title>
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</head>
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<body>
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<h3>bitops-3bit-bits-in-byte</h3>
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<div id="console">
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</div>
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<script>
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var _sunSpiderStartDate = new Date();
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// Copyright (c) 2004 by Arthur Langereis (arthur_ext at domain xfinitegames, tld com
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// 1 op = 6 ANDs, 3 SHRs, 3 SHLs, 4 assigns, 2 ADDs
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// O(1)
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function fast3bitlookup(b) {
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var c, bi3b = 0xE994; // 0b1110 1001 1001 0100; // 3 2 2 1 2 1 1 0
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c = 3 & (bi3b >> ((b << 1) & 14));
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c += 3 & (bi3b >> ((b >> 2) & 14));
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c += 3 & (bi3b >> ((b >> 5) & 6));
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return c;
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/*
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lir4,0xE994; 9 instructions, no memory access, minimal register dependence, 6 shifts, 2 adds, 1 inline assign
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rlwinmr5,r3,1,28,30
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rlwinmr6,r3,30,28,30
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rlwinmr7,r3,27,29,30
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rlwnmr8,r4,r5,30,31
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rlwnmr9,r4,r6,30,31
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rlwnmr10,r4,r7,30,31
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addr3,r8,r9
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addr3,r3,r10
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*/
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}
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function TimeFunc(func) {
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var x, y, t;
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for(var x=0; x<500; x++)
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for(var y=0; y<256; y++) func(y);
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}
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TimeFunc(fast3bitlookup);
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var _sunSpiderInterval = new Date() - _sunSpiderStartDate;
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document.getElementById("console").innerHTML = _sunSpiderInterval;
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</script>
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</body>
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</html>
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