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1 <!DOCTYPE html> |
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2 <head> |
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3 <!-- |
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4 Copyright (C) 2007 Apple Inc. All rights reserved. |
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5 |
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6 Redistribution and use in source and binary forms, with or without |
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7 modification, are permitted provided that the following conditions |
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8 are met: |
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9 1. Redistributions of source code must retain the above copyright |
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10 notice, this list of conditions and the following disclaimer. |
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11 2. Redistributions in binary form must reproduce the above copyright |
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12 notice, this list of conditions and the following disclaimer in the |
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13 documentation and/or other materials provided with the distribution. |
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14 |
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15 THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
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16 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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18 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
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19 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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20 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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22 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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23 OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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26 --> |
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27 |
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28 <title>SunSpider bitops-bits-in-byte</title> |
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29 |
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30 </head> |
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31 |
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32 <body> |
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33 <h3>bitops-bits-in-byte</h3> |
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34 <div id="console"> |
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35 </div> |
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36 |
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37 <script> |
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38 |
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39 var _sunSpiderStartDate = new Date(); |
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40 |
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41 // Copyright (c) 2004 by Arthur Langereis (arthur_ext at domain xfinitegames, tld com) |
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42 |
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43 |
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44 // 1 op = 2 assigns, 16 compare/branches, 8 ANDs, (0-8) ADDs, 8 SHLs |
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45 // O(n) |
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46 function bitsinbyte(b) { |
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47 var m = 1, c = 0; |
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48 while(m<0x100) { |
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49 if(b & m) c++; |
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50 m <<= 1; |
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51 } |
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52 return c; |
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53 } |
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54 |
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55 function TimeFunc(func) { |
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56 var x, y, t; |
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57 for(var x=0; x<350; x++) |
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58 for(var y=0; y<256; y++) func(y); |
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59 } |
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60 |
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61 TimeFunc(bitsinbyte); |
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62 |
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63 |
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64 var _sunSpiderInterval = new Date() - _sunSpiderStartDate; |
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65 |
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66 |
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67 document.getElementById("console").innerHTML = _sunSpiderInterval; |
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68 </script> |
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69 |
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70 |
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71 </body> |
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72 </html> |