PC Lab 1: Diferență între versiuni
De la WikiLabs
Jump to navigationJump to search
Cbira (discuție | contribuții) Fără descriere a modificării |
Cbira (discuție | contribuții) Fără descriere a modificării |
||
| (Nu s-a afișat o versiune intermediară efectuată de același utilizator) | |||
| Linia 5: | Linia 5: | ||
Expected/Presented techniques: | Expected/Presented techniques: | ||
first implementation ~ 10 seconds | Grade 7/10: first implementation ~ 10 seconds | ||
compiler optimized ~ 5 seconds | Grade 8/10: compiler optimized ~ 5 seconds | ||
loop unrolling | Grade 9/10: | ||
loop unrolling ( > 1s ) | |||
optimizing variables into registers ( > 1s ) | |||
Grade 10: bit-tricks 500 ms | |||
256-entry 8-bit table of 1 KB | Grade 10: 256-entry 8-bit table of 1 KB ~ 400 ms | ||
16-bit table of 64 k entries (256 KB) | Grade 10: 16-bit table of 64 k entries (256 KB) ~ 200 ms | ||
32-bit table of 4 G entries (16 GB) | 32-bit table of 4 G entries (16 GB) ~ 66 ms | ||
Versiunea curentă din 8 martie 2018 13:53
Session 1, x86 optimization:
C/C++: increase the execution speed for the code that reverses the order of the bits composing a 100 M esantioane of unsigned 32-bit (eg. 10111...11 -> 11..11101)
Expected/Presented techniques:
Grade 7/10: first implementation ~ 10 seconds
Grade 8/10: compiler optimized ~ 5 seconds
Grade 9/10: loop unrolling ( > 1s )
optimizing variables into registers ( > 1s )
Grade 10: bit-tricks 500 ms
Grade 10: 256-entry 8-bit table of 1 KB ~ 400 ms
Grade 10: 16-bit table of 64 k entries (256 KB) ~ 200 ms
32-bit table of 4 G entries (16 GB) ~ 66 ms
