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Inlining small non-recursive functions #4472
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LLVM will potentially inline any function. It uses a threshold size for it, which is modified by
inlinehintand overridden withalways_inline.It can't inline cross-crate though without
#[inline]because we aren't usually outputting the AST.@thestinger I'd say thats a separate issue. Either @huonw's
#[inline(maybe)]makes it in, or we take a guess at intent and output the ast, sans#[inline]attribute.- added a commit that references this issue
on Jul 20, 2025 - added a commit that references this issue
on Jul 21, 2025
I know that inlining heuristics are a black hole. However, it seems that we're growing lots of
#[inline_always]attributes on small non-recursive functions. I have no idea what mechanism LLVM has for inlining hints (besides "always inline" annotations on a function), but telling it to always inline non-recursive functions below a certain size threshold would reduce the amount of clutter.