perf(minifier): reduce allocations#10301
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CodSpeed Instrumentation Performance ReportMerging #10301 will degrade performances by 3.54%Comparing Summary
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In these 3 places, we `pop` a statement from a `Vec` and insert it elsewhere. Previously we used `take_in_box` to get the statement first (which involves allocating a dummy node into arena) and then `pop`-ed and discarded the dummy. Instead do the `pop` first, to avoid the unnecessary allocation. I *assume* that compiler will see that the `unreachable!` path is genuinely unreachable because we just checked the type of the statement above, and will elide that check.
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In these 3 places, we
popa statement from aVecand insert it elsewhere.Previously we used
take_in_boxto get the statement first (which involves allocating a dummy node into arena) and thenpop-ed and discarded the dummy. Instead do thepopfirst, to avoid the unnecessary allocation.I assume that compiler will see that the
unreachable!path is genuinely unreachable because we just checked the type of the statement above, and will elide that check.