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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
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<!DOCTYPE html>
<head>
<!--
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modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
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<title>SunSpider bitops-3bit-bits-in-byte</title>
</head>
<body>
<h3>bitops-3bit-bits-in-byte</h3>
<div id="console">
</div>
<script>
var _sunSpiderStartDate = new Date();
// Copyright (c) 2004 by Arthur Langereis (arthur_ext at domain xfinitegames, tld com
// 1 op = 6 ANDs, 3 SHRs, 3 SHLs, 4 assigns, 2 ADDs
// O(1)
function fast3bitlookup(b) {
var c, bi3b = 0xE994; // 0b1110 1001 1001 0100; // 3 2 2 1 2 1 1 0
c = 3 & (bi3b >> ((b << 1) & 14));
c += 3 & (bi3b >> ((b >> 2) & 14));
c += 3 & (bi3b >> ((b >> 5) & 6));
return c;
/*
lir4,0xE994; 9 instructions, no memory access, minimal register dependence, 6 shifts, 2 adds, 1 inline assign
rlwinmr5,r3,1,28,30
rlwinmr6,r3,30,28,30
rlwinmr7,r3,27,29,30
rlwnmr8,r4,r5,30,31
rlwnmr9,r4,r6,30,31
rlwnmr10,r4,r7,30,31
addr3,r8,r9
addr3,r3,r10
*/
}
function TimeFunc(func) {
var x, y, t;
for(var x=0; x<500; x++)
for(var y=0; y<256; y++) func(y);
}
TimeFunc(fast3bitlookup);
var _sunSpiderInterval = new Date() - _sunSpiderStartDate;
document.getElementById("console").innerHTML = _sunSpiderInterval;
</script>
</body>
</html>