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Nilstrieb 2022-07-23 19:18:15 +00:00
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@ -153,7 +153,7 @@ don’t think this can reasonable be changed.</p>
that can bring clear performance wins (for <code>noalias</code> on <code>&mut T</code>, those were measureable). So the only question remains:
<strong>How much performance does <code>noalias</code> on <code>Box<T></code> give us now, and how many potential performance improvements could we get in the
future?</strong> For the latter, there is no simple answer. For the former, there is. <code>rustc</code> has <a href="https://github.com/rust-lang/rust/pull/99527"><em>no</em> performance improvements</a>
from being compiled with <code>noalias</code> on <code>Box<T></code>.</p>
from being compiled with <code>noalias</code> on <code>Box<T></code>, but this isn’t really representative since rustc mostly uses arenas instead of box internally.</p>
<p>I have also benchmarked a few crates from the ecosystem with and without noalias on box, and the <a href="https://gist.github.com/Nilstrieb/9a0751fb9fd1044a30ab55cef9a7d335">results</a>
were inconclusive. (At the time of writing, only regex-syntax, tokio, and syn have been benchmarked.) regex-syntax showed no changes. Tokio showed a few improvements without noalias
which is very weird, so maybe the benchmarks aren’t really good or something else was going on. And syn tended towards minor regressions without noalias, but the benchmarks had high