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Resurrect #70477: "Use the niche optimization if other variant are small enough" #75866

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Resurrect #70477: "Use the niche optimization if other variant are small enough" #75866

wants to merge 2 commits into from

Commits on Sep 27, 2020

  1. Use the niche optimisation if other enum variants are small enough 

    * Put the largest niche first

* Add test from issue 63866

* Add test for enum of sized/unsized

* Prefer fields that are already earlier in the struct
    @ogoffart @erikdesjardins
    ogoffart authored and erikdesjardins committed Sep 27, 2020
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  2. TEMP FOR PERF: remove the optimization, leaving only the field reorde… 

    …ring
    @erikdesjardins
    erikdesjardins committed Sep 27, 2020
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