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comparison: js/src/jit-test/tests/sunspider/check-bitops-3bit-bits-in-byte.js
js/src/jit-test/tests/sunspider/check-bitops-3bit-bits-in-byte.js
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| -1:000000000000 | 0:beef21322348 |
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| 1 // Copyright (c) 2004 by Arthur Langereis (arthur_ext at domain xfinitegames, tld com | |
| 2 | |
| 3 // 1 op = 6 ANDs, 3 SHRs, 3 SHLs, 4 assigns, 2 ADDs | |
| 4 // O(1) | |
| 5 function fast3bitlookup(b) { | |
| 6 var c, bi3b = 0xE994; // 0b1110 1001 1001 0100; // 3 2 2 1 2 1 1 0 | |
| 7 c = 3 & (bi3b >> ((b << 1) & 14)); | |
| 8 c += 3 & (bi3b >> ((b >> 2) & 14)); | |
| 9 c += 3 & (bi3b >> ((b >> 5) & 6)); | |
| 10 return c; | |
| 11 | |
| 12 /* | |
| 13 lir4,0xE994; 9 instructions, no memory access, minimal register dependence, 6 shifts, 2 adds, 1 inline assign | |
| 14 rlwinmr5,r3,1,28,30 | |
| 15 rlwinmr6,r3,30,28,30 | |
| 16 rlwinmr7,r3,27,29,30 | |
| 17 rlwnmr8,r4,r5,30,31 | |
| 18 rlwnmr9,r4,r6,30,31 | |
| 19 rlwnmr10,r4,r7,30,31 | |
| 20 addr3,r8,r9 | |
| 21 addr3,r3,r10 | |
| 22 */ | |
| 23 } | |
| 24 | |
| 25 var ret = 0; | |
| 26 function TimeFunc(func) { | |
| 27 var x, y, t; | |
| 28 for(var x=0; x<500; x++) | |
| 29 for(var y=0; y<256; y++) { | |
| 30 ret += func(y); | |
| 31 } | |
| 32 } | |
| 33 | |
| 34 TimeFunc(fast3bitlookup); | |
| 35 assertEq(ret, 512000) |
