rmuir opened a new pull request #17:
URL: https://github.com/apache/lucene/pull/17
Here's my stab at it. It gives ~ 25% improvement for big vectors and doesn't
cause regressions. I tested sizes of
1,4,6,8,13,16,25,32,64,100,128,207,256,300,512,702,1024. It starts to give good
speedups for sizes bigger than 32.
<details>
<summary>Benchmarks</summary>
DotProduct.dotProductOld 1 thrpt 45 184.487 ± 0.364 ops/us
DotProduct.dotProductNew 1 thrpt 45 184.675 ± 0.308 ops/us
DotProduct.dotProductOld 4 thrpt 45 132.525 ± 1.124 ops/us
DotProduct.dotProductNew 4 thrpt 45 133.688 ± 0.383 ops/us
DotProduct.dotProductOld 6 thrpt 45 127.527 ± 0.437 ops/us
DotProduct.dotProductNew 6 thrpt 45 122.776 ± 3.605 ops/us
DotProduct.dotProductOld 8 thrpt 45 95.154 ± 0.209 ops/us
DotProduct.dotProductNew 8 thrpt 45 109.312 ± 0.282 ops/us
DotProduct.dotProductOld 13 thrpt 45 73.528 ± 0.179 ops/us
DotProduct.dotProductNew 13 thrpt 45 75.585 ± 0.149 ops/us
DotProduct.dotProductOld 16 thrpt 45 67.102 ± 0.165 ops/us
DotProduct.dotProductNew 16 thrpt 45 71.895 ± 0.207 ops/us
DotProduct.dotProductOld 25 thrpt 45 46.128 ± 0.068 ops/us
DotProduct.dotProductNew 25 thrpt 45 49.999 ± 0.106 ops/us
DotProduct.dotProductOld 32 thrpt 45 40.341 ± 0.136 ops/us
DotProduct.dotProductNew 32 thrpt 45 46.885 ± 0.101 ops/us (+16%)
DotProduct.dotProductOld 64 thrpt 45 23.086 ± 0.039 ops/us
DotProduct.dotProductNew 64 thrpt 45 27.729 ± 0.046 ops/us (+20%)
DotProduct.dotProductOld 100 thrpt 45 14.183 ± 0.041 ops/us
DotProduct.dotProductNew 100 thrpt 45 17.707 ± 0.095 ops/us (+25%)
DotProduct.dotProductOld 128 thrpt 45 12.307 ± 0.022 ops/us
DotProduct.dotProductNew 128 thrpt 45 14.998 ± 0.099 ops/us (+21%)
DotProduct.dotProductOld 207 thrpt 45 7.749 ± 0.047 ops/us
DotProduct.dotProductNew 207 thrpt 45 9.069 ± 0.082 ops/us (+17%)
DotProduct.dotProductOld 256 thrpt 45 6.365 ± 0.012 ops/us
DotProduct.dotProductNew 256 thrpt 45 7.992 ± 0.016 ops/us (+26%)
DotProduct.dotProductOld 300 thrpt 45 5.066 ± 0.009 ops/us
DotProduct.dotProductNew 300 thrpt 45 6.381 ± 0.016 ops/us (+26%)
DotProduct.dotProductOld 512 thrpt 45 3.216 ± 0.017 ops/us
DotProduct.dotProductNew 512 thrpt 45 4.089 ± 0.009 ops/us (+27%)
DotProduct.dotProductOld 702 thrpt 45 2.370 ± 0.004 ops/us
DotProduct.dotProductNew 702 thrpt 45 2.809 ± 0.007 ops/us (+19%)
DotProduct.dotProductOld 1024 thrpt 45 1.611 ± 0.003 ops/us
DotProduct.dotProductNew 1024 thrpt 45 2.049 ± 0.004 ops/us (+27%)
</details>
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