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Faster multiple_of? method #33854

Merged
merged 1 commit into from Sep 12, 2018
Merged

Faster multiple_of? method #33854

merged 1 commit into from Sep 12, 2018

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@rigani
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@rigani rigani commented Sep 12, 2018

Summary

activesupport core extension Integer#multiple_of?

  • use faster == 0 instead of zero?
  • use faster == instead of !=

Benchmark

0.multiple_of?(0)

Warming up --------------------------------------
    new_multiple_of?    19.633M i/s -     19.747M times in 1.005812s (50.93ns/i)
        multiple_of?    15.569M i/s -     15.741M times in 1.011058s (64.23ns/i)
Calculating -------------------------------------
    new_multiple_of?    29.591M i/s -     58.899M times in 1.990465s (33.79ns/i)
        multiple_of?    22.291M i/s -     46.706M times in 2.095339s (44.86ns/i)

Comparison:
    new_multiple_of?:  29590706.2 i/s
        multiple_of?:  22290597.8 i/s - 1.33x  slower

4611686018427387903.multiple_of?(42)

Warming up --------------------------------------
    new_multiple_of?    13.721M i/s -     13.824M times in 1.007495s (72.88ns/i)
        multiple_of?    14.243M i/s -     14.374M times in 1.009176s (70.21ns/i)
Calculating -------------------------------------
    new_multiple_of?    20.231M i/s -     41.164M times in 2.034712s (49.43ns/i)
        multiple_of?    18.813M i/s -     42.729M times in 2.271264s (53.16ns/i)

Comparison:
    new_multiple_of?:  20230631.7 i/s
        multiple_of?:  18812736.4 i/s - 1.08x  slower
@rails-bot
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@rails-bot rails-bot commented Sep 12, 2018

Thanks for the pull request, and welcome! The Rails team is excited to review your changes, and you should hear from @kaspth (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

This repository is being automatically checked for code quality issues using Code Climate. You can see results for this analysis in the PR status below. Newly introduced issues should be fixed before a Pull Request is considered ready to review.

Please see the contribution instructions for more information.

@rafaelfranca rafaelfranca merged commit 792fead into rails:master Sep 12, 2018
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codeclimate All good!
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@zuver
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@zuver zuver commented Sep 17, 2018

Can anyone explain why simply reversing the ternary operands has an effect in this context?

@jacortinas
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@jacortinas jacortinas commented Sep 18, 2018

@zuver I don't think changing the order of the operands is the change, but changing the type of equality checks being done and removing a method call.

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