1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jit-test/tests/sunspider/check-bitops-3bit-bits-in-byte.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,35 @@
1.4 +// Copyright (c) 2004 by Arthur Langereis (arthur_ext at domain xfinitegames, tld com
1.5 +
1.6 +// 1 op = 6 ANDs, 3 SHRs, 3 SHLs, 4 assigns, 2 ADDs
1.7 +// O(1)
1.8 +function fast3bitlookup(b) {
1.9 +var c, bi3b = 0xE994; // 0b1110 1001 1001 0100; // 3 2 2 1 2 1 1 0
1.10 +c = 3 & (bi3b >> ((b << 1) & 14));
1.11 +c += 3 & (bi3b >> ((b >> 2) & 14));
1.12 +c += 3 & (bi3b >> ((b >> 5) & 6));
1.13 +return c;
1.14 +
1.15 +/*
1.16 +lir4,0xE994; 9 instructions, no memory access, minimal register dependence, 6 shifts, 2 adds, 1 inline assign
1.17 +rlwinmr5,r3,1,28,30
1.18 +rlwinmr6,r3,30,28,30
1.19 +rlwinmr7,r3,27,29,30
1.20 +rlwnmr8,r4,r5,30,31
1.21 +rlwnmr9,r4,r6,30,31
1.22 +rlwnmr10,r4,r7,30,31
1.23 +addr3,r8,r9
1.24 +addr3,r3,r10
1.25 +*/
1.26 +}
1.27 +
1.28 +var ret = 0;
1.29 +function TimeFunc(func) {
1.30 + var x, y, t;
1.31 + for(var x=0; x<500; x++)
1.32 + for(var y=0; y<256; y++) {
1.33 + ret += func(y);
1.34 + }
1.35 +}
1.36 +
1.37 +TimeFunc(fast3bitlookup);
1.38 +assertEq(ret, 512000)
