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m b./\ Improved |
initial writing: 2007-12-19 |
The dyads m b./\ for atomic m e. 17 22 23 25 on integer arguments (that is, bitwise and, xor, or, and equal) have been made more efficient. The following benchmarks demonstrate the improvements.
i =: _1e9 + 1e5 ?@$ 2e9 i3=: _1e9 + 1e5 3 ?@$ 2e9 ts=: 6!:2 , 7!:2@] NB. time and space ts 'Expression'
| Expression | J 6.02 | J 6.01 | Ratio | |||||||||
| 4 (17 b.)/\ i | 0.000632 | 5.25888e5 | 0.066650 | 2.09939e6 | 105.48 | 3.99 | ||||||
| 19 (22 b.)/\ i | 0.000635 | 5.25824e5 | 0.050669 | 2.09926e6 | 79.84 | 3.99 | ||||||
| 4 (23 b.)/\ i3 | 0.001898 | 2.09882e6 | 0.074529 | 5.24512e6 | 39.26 | 2.50 | ||||||
| 19 (25 b.)/\ i3 | 0.001840 | 2.09875e6 | 0.060254 | 5.24512e6 | 32.74 | 2.50 | ||||||