Add PreviousSet and PreviousClear functions #178
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These are analogous to NextClear and NextSet but scan backwards. The current implementations are naive.
On an Apple M2 they produces these results: BenchmarkBitsetOps/NextSet-8 2537938 470.0 ns/op BenchmarkBitsetOps/NextClear-8 2564336 468.1 ns/op BenchmarkBitsetOps/PreviousSet-8 19930 59924 ns/op BenchmarkBitsetOps/PreviousClear-8 19912 61002 ns/op A future commit should improve upon this.
On an Apple M2 our benchmark produces these results:
BenchmarkBitsetOps/NextSet-8 2552749 468.1 ns/op
BenchmarkBitsetOps/NextClear-8 2571921 466.9 ns/op
BenchmarkBitsetOps/PreviousSet-8 1760882 682.4 ns/op
BenchmarkBitsetOps/PreviousClear-8 1763605 680.0 ns/op
Which greatly improves on the prior results of
BenchmarkBitsetOps/PreviousSet-8 19930 59924 ns/op
BenchmarkBitsetOps/PreviousClear-8 19912 61002 ns/op
The missing coverage was probing multiple words and failing to find anything.
lemire
reviewed
Nov 15, 2024
lemire
reviewed
Nov 15, 2024
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@lukesandberg How did you verify that the bound check elimination trick worked? |
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Running tests. |
…PreviousClear and PreviousSet There is no impact on performance, just a clean up.
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Removed the bounds check elimination since it was non functional. |
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Add PreviousSet and PreviousClear functions
These are analogous to NextSet and NextClear but probing in the opposite direction.
Fixes #86