.@eddyb_r does it again, with much improved Rust copy propagation:https://github.com/rust-lang/rust/pull/46321 …
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Maybe if we start handling fields, simplify derefs of borrows, etc. But right now MIR Calls can have Move arguments, so the only opportunity inlining can offer to this initial version of the optimization is literally a direct move from an argument to the return location.
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I can only guess this will help speed up the LLVM phase?