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| 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 |
| 18 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| 19 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 20 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 22 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| 23 OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 --> |
| 27 |
| 28 <title>SunSpider bitops-3bit-bits-in-byte</title> |
| 29 <link rel="stylesheet" href="sunspider.css"> |
| 30 </head> |
| 31 |
| 32 <body> |
| 33 <h3>bitops-3bit-bits-in-byte</h3> |
| 34 <div id="console"> |
| 35 </div> |
| 36 <script src="sunspider-record-result.js"></script> |
| 37 <script> |
| 38 |
| 39 var _sunSpiderStartDate = new Date(); |
| 40 |
| 41 // Copyright (c) 2004 by Arthur Langereis (arthur_ext at domain xfinitegames, tl
d com |
| 42 |
| 43 // 1 op = 6 ANDs, 3 SHRs, 3 SHLs, 4 assigns, 2 ADDs |
| 44 // O(1) |
| 45 function fast3bitlookup(b) { |
| 46 var c, bi3b = 0xE994; // 0b1110 1001 1001 0100; // 3 2 2 1 2 1 1 0 |
| 47 c = 3 & (bi3b >> ((b << 1) & 14)); |
| 48 c += 3 & (bi3b >> ((b >> 2) & 14)); |
| 49 c += 3 & (bi3b >> ((b >> 5) & 6)); |
| 50 return c; |
| 51 |
| 52 /* |
| 53 lir4,0xE994; 9 instructions, no memory access, minimal register dependence, 6 sh
ifts, 2 adds, 1 inline assign |
| 54 rlwinmr5,r3,1,28,30 |
| 55 rlwinmr6,r3,30,28,30 |
| 56 rlwinmr7,r3,27,29,30 |
| 57 rlwnmr8,r4,r5,30,31 |
| 58 rlwnmr9,r4,r6,30,31 |
| 59 rlwnmr10,r4,r7,30,31 |
| 60 addr3,r8,r9 |
| 61 addr3,r3,r10 |
| 62 */ |
| 63 } |
| 64 |
| 65 |
| 66 function TimeFunc(func) { |
| 67 var x, y, t; |
| 68 for(var x=0; x<500; x++) |
| 69 for(var y=0; y<256; y++) func(y); |
| 70 } |
| 71 |
| 72 TimeFunc(fast3bitlookup); |
| 73 |
| 74 |
| 75 var _sunSpiderInterval = new Date() - _sunSpiderStartDate; |
| 76 |
| 77 record(_sunSpiderInterval); |
| 78 </script> |
| 79 |
| 80 |
| 81 </body> |
| 82 </html> |
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Chromium Code Reviews
Issue 42549:
Add a copy of SunSpider 0.9 for performance testing.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/