Stream: git-wasmtime

Topic: wasmtime / PR #14290 Seed alias analysis worklist in reve...


view this post on Zulip Wasmtime GitHub notifications bot (Sep 07 2026 at 01:20):

fitzgen opened PR #14290 from fitzgen:seed-alias-analysis-in-rpo to bytecodealliance:main:

This visits a block's predecessors before the block itself, which minimizes the number of times we need to reprocess a block to reach the fixed point (ignoring backedges).

Here are the Sightglass results (faster on 13/26 of the PCA subset; up to 1.02x faster), plus some extra benchmarks that use 1000 different globals in order to create benchmarks with many alias regions (up to 16.27x faster).

<details>

compilation :: cycles :: Sum Total

    Δ = 8422617.35 ± 280685.06 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 1.15x to 1.16x faster than 5e00554696-baseline.dylib!

    ┌──────────┬──────────┬─────────────┬──────────┬─────────────────────────────┐
     Min       Max       Mean         Median    Engine                      
    ├──────────┼──────────┼─────────────┼──────────┼─────────────────────────────┤
     60331062  64369397  61754473.07  61678752  5e00554696-baseline.dylib   
    ├──────────┼──────────┼─────────────┼──────────┼─────────────────────────────┤
     51846162  55688043  53331855.72  53253352  c86906f168-A-rpo-seed.dylib 
    └──────────┴──────────┴─────────────┴──────────┴─────────────────────────────┘

compilation :: instructions-retired :: Sum Total

    Δ = 7583044017.87 ± 17783614.28 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 1.05x to 1.05x faster than 5e00554696-baseline.dylib!

    ┌──────────────┬──────────────┬─────────────────┬──────────────┬─────────────────────────────┐
     Min           Max           Mean             Median        Engine                      
    ├──────────────┼──────────────┼─────────────────┼──────────────┼─────────────────────────────┤
     168815527589  168999930832  168907183902.21  168906273009  5e00554696-baseline.dylib   
    ├──────────────┼──────────────┼─────────────────┼──────────────┼─────────────────────────────┤
     161221272391  161466420307  161324139884.34  161323996892  c86906f168-A-rpo-seed.dylib 
    └──────────────┴──────────────┴─────────────────┴──────────────┴─────────────────────────────┘

compilation :: instructions-retired :: globals-1000-cfg

    Δ = 3488395020.90 ± 330370.05 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 16.27x to 16.27x faster than 5e00554696-baseline.dylib!

    ┌────────────┬────────────┬───────────────┬────────────┬─────────────────────────────┐
     Min         Max         Mean           Median      Engine                      
    ├────────────┼────────────┼───────────────┼────────────┼─────────────────────────────┤
     3714492504  3720971964  3716830864.19  3716697153  5e00554696-baseline.dylib   
    ├────────────┼────────────┼───────────────┼────────────┼─────────────────────────────┤
     227560263   229543940   228435843.29   228446605   c86906f168-A-rpo-seed.dylib 
    └────────────┴────────────┴───────────────┴────────────┴─────────────────────────────┘

compilation :: instructions-retired :: globals-1000-loop

    Δ = 3676743569.51 ± 269112.72 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 14.98x to 14.99x faster than 5e00554696-baseline.dylib!

    ┌────────────┬────────────┬───────────────┬────────────┬─────────────────────────────┐
     Min         Max         Mean           Median      Engine                      
    ├────────────┼────────────┼───────────────┼────────────┼─────────────────────────────┤
     3938271014  3942494061  3939646001.25  3939498236  5e00554696-baseline.dylib   
    ├────────────┼────────────┼───────────────┼────────────┼─────────────────────────────┤
     262014252   264993857   262902431.74   262817743   c86906f168-A-rpo-seed.dylib 
    └────────────┴────────────┴───────────────┴────────────┴─────────────────────────────┘

compilation :: cycles :: globals-1000-cfg

    Δ = 4080711.94 ± 12420.75 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 11.78x to 11.85x faster than 5e00554696-baseline.dylib!

    ┌─────────┬─────────┬────────────┬─────────┬─────────────────────────────┐
     Min      Max      Mean        Median   Engine                      
    ├─────────┼─────────┼────────────┼─────────┼─────────────────────────────┤
     4353068  4563437  4458098.75  4457209  5e00554696-baseline.dylib   
    ├─────────┼─────────┼────────────┼─────────┼─────────────────────────────┤
     325067   427413   377386.81   377755   c86906f168-A-rpo-seed.dylib 
    └─────────┴─────────┴────────────┴─────────┴─────────────────────────────┘

compilation :: cycles :: globals-1000-loop

    Δ = 4104661.05 ± 14351.30 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 10.61x to 10.68x faster than 5e00554696-baseline.dylib!

    ┌─────────┬─────────┬────────────┬─────────┬─────────────────────────────┐
     Min      Max      Mean        Median   Engine                      
    ├─────────┼─────────┼────────────┼─────────┼─────────────────────────────┤
     4397623  4666018  4530267.27  4533174  5e00554696-baseline.dylib   
    ├─────────┼─────────┼────────────┼─────────┼─────────────────────────────┤
     370362   491900   425606.22   428477   c86906f168-A-rpo-seed.dylib 
    └─────────┴─────────┴────────────┴─────────┴─────────────────────────────┘

compilation :: instructions-retired :: tinygo-json

    Δ = 107193076.80 ± 815883.64 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 1.02x to 1.02x faster than 5e00554696-baseline.dylib!

    ┌────────────┬────────────┬───────────────┬────────────┬─────────────────────────────┐
     Min         Max         Mean           Median      Engine                      
    ├────────────┼────────────┼───────────────┼────────────┼─────────────────────────────┤
     5439283619  5450038733  5445123463.82  5445131000  5e00554696-baseline.dylib   
    ├────────────┼────────────┼───────────────┼────────────┼─────────────────────────────┤
     5332483991  5345446881  5337930387.02  5337890931  c86906f168-A-rpo-seed.dylib 
    └────────────┴────────────┴───────────────┴────────────┴─────────────────────────────┘

compilation :: instructions-retired :: kotlin-richards

    Δ = 12093387.57 ± 584630.03 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 1.02x to 1.02x faster than 5e00554696-baseline.dylib!

    ┌───────────┬───────────┬──────────────┬───────────┬─────────────────────────────┐
     Min        Max        Mean          Median     Engine                      
    ├───────────┼───────────┼──────────────┼───────────┼─────────────────────────────┤
     634797689  643565242  639630353.10  639744730  5e00554696-baseline.dylib   
    ├───────────┼───────────┼──────────────┼───────────┼─────────────────────────────┤
     623934476  631123628  627536965.53  627528340  c86906f168-A-rpo-seed.dylib 
    └───────────┴───────────┴──────────────┴───────────┴─────────────────────────────┘

compilation :: instructions-retired :: meshoptimizer

    Δ = 2362359.47 ± 404322.82 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 1.01x to 1.01x faster than 5e00554696-baseline.dylib!

    ┌───────────┬───────────┬──────────────┬───────────┬─────────────────────────────┐
     Min        Max        Mean          Median     Engine                      
    ├───────────┼───────────┼──────────────┼───────────┼─────────────────────────────┤
     383858384  390770689  388053353.33  388001245  5e00554696-baseline.dylib   
    ├───────────┼───────────┼──────────────┼───────────┼─────────────────────────────┤
     383261763  387923421  385690993.86  385615471  c86906f168-A-rpo-seed.dylib 
    └───────────┴───────────┴──────────────┴───────────┴─────────────────────────────┘

compilation :: instructions-retired :: shootout-minicsv

    Δ = 601519.85 ± 472227.74 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 1.00x to 1.01x faster than 5e00554696-baseline.dylib!

    ┌───────────┬───────────┬──────────────┬───────────┬─────────────────────────────┐
     Min        Max        Mean          Median     Engine                      
    ├───────────┼───────────┼──────────────┼───────────┼─────────────────────────────┤
     117035013  123844363  120882817.37  121027989  5e00554696-baseline.dylib   
    ├───────────┼───────────┼──────────────┼───────────┼─────────────────────────────┤
     116974294  123132924  120281297.52  120136429  c86906f168-A-rpo-seed.dylib 
    └───────────┴───────────┴──────────────┴───────────┴─────────────────────────────┘

compilation :: instructions-retired :: quicksort

    Δ = 881381.59 ± 416211.85 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 1.00x to 1.01x faster than 5e00554696-baseline.dylib!

    ┌───────────┬───────────┬──────────────┬───────────┬─────────────────────────────┐
     Min        Max        Mean          Median     Engine                      
    ├───────────┼───────────┼──────────────┼───────────┼─────────────────────────────┤
     223787543  229133325  225969513.23  225822591  5e00554696-baseline.dylib   
    ├───────────┼───────────┼──────────────┼───────────┼─────────────────────────────┤
     222127742  228398304  225088131.64  225055771  c86906f168-A-rpo-seed.dylib 
    └───────────┴───────────┴──────────────┴───────────┴─────────────────────────────┘

compilation :: instructions-retired :: bz2

    Δ = 2312715.06 ± 480227.08 (confidence = 99%)

    c86906f168-A-rpo-seed.dylib is 1.00x to 1.00x faster than 5e00554696-baseline.dylib!

    ┌───────────┬───────────┬──────────────┬───────────┬─────────────────────────────┐
     Min        Max        Mean          Median     Engine                      
    ├───
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view this post on Zulip Wasmtime GitHub notifications bot (Sep 07 2026 at 01:20):

fitzgen requested cfallin for a review on PR #14290.

view this post on Zulip Wasmtime GitHub notifications bot (Sep 07 2026 at 01:20):

fitzgen requested wasmtime-compiler-reviewers for a review on PR #14290.

view this post on Zulip Wasmtime GitHub notifications bot (Sep 07 2026 at 02:54):

github-actions[bot] added the label cranelift on PR #14290.

view this post on Zulip Wasmtime GitHub notifications bot (Sep 08 2026 at 18:15):

:thumbs_up: cfallin submitted PR review:

Thanks!

view this post on Zulip Wasmtime GitHub notifications bot (Sep 08 2026 at 18:15):

cfallin added PR #14290 Seed alias analysis worklist in reverse post-order to the merge queue.

view this post on Zulip Wasmtime GitHub notifications bot (Sep 08 2026 at 18:42):

:check: cfallin merged PR #14290.

view this post on Zulip Wasmtime GitHub notifications bot (Sep 08 2026 at 18:42):

cfallin removed PR #14290 Seed alias analysis worklist in reverse post-order from the merge queue.


Last updated: Sep 20 2026 at 18:08 UTC