| <html> |
| <head> |
| <script src="../htmlrunner.js"></script> |
| <script> |
| // 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<250; x++) |
| for(var y=0; y<256; y++) func(y); |
| } |
| |
| window.onload = function(){ startTest("sunspider-bitops-3bit-bits-in-byte", '3664f684'); |
| |
| test("3bit bits in byte", function(){ |
| TimeFunc(fast3bitlookup); |
| }); |
| |
| endTest(); }; |
| </script> |
| </head> |
| <body></body> |
| </html> |
