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Improve performance of stable sort #100856

Closed
wants to merge 5 commits into from
Closed

Improve performance of stable sort #100856

wants to merge 5 commits into from

Commits on Nov 4, 2022

  1. Improve performance of stable sort 

    This reworks the internals of slice::sort. Mainly:
- Introduce branchless swap_next_if and optimized sortX functions
- Speedup core batch extension with sort16
- Many small tweaks to reduce the amount of branches/jumps

This commit is incomplete and MUST NOT be merged as is. It is missing Copy
detection and would break uniqueness preservation of values that are being
sorted.
    @Voultapher
    Voultapher committed Nov 4, 2022
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  2. Fix formatting

    @Voultapher
    Voultapher committed Nov 4, 2022
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  3. Rework new_stable_sort with sorting-network

    @Voultapher
    Voultapher committed Nov 4, 2022
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  4. Re-use TimSort analysis for small slices 

    Add new loop based mini-merge sort for small sizes. This extends
allocation free sorting for random inputs of types that qualify up to
32.
    @Voultapher
    Voultapher committed Nov 4, 2022
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  5. Apply cfg(not(no_global_oom_handling) to everything

    @Voultapher
    Voultapher committed Nov 4, 2022
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