mir: add used_generic_parameters_needs_subst
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r? @oli-obk I got a crash course in polymorphization magic in https://rust-lang.zulipchat.com/#narrow/stream/216091-t-compiler.2Fwg-polymorphization/topic/tokio.20regression.20%28.2374614%29/near/205594913 |
This commit adds a `ensure_monomorphic_enough` utility function which checks whether a type needs substitution, but only for parameters that the `unused_generic_params` query considers used. `ensure_monomorphic_enough` is then used throughout interpret where `needs_subst` checks previously existed (in particular, for some pointer casts and for reflection intrinsics more precise). Signed-off-by: David Wood <david@davidtw.co>
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cc @rust-lang/wg-const-eval @bors r+ |
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☀️ Test successful - checks-actions, checks-azure |
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…optimisations, r=lcnr polymorphization: various improvements This PR includes a handful of polymorphisation-related changes: - @Mark-Simulacrum's suggestions [from this comment](rust-lang#74633 (comment)): - Use a `FiniteBitSet<u32>` over a `FiniteBitSet<u64>` as most functions won't have 64 generic parameters. - Don't encode polymorphisation results in metadata when every parameter is used (in this case, just invoking polymorphisation will probably be quicker). - @lcnr's suggestion [from this comment](rust-lang#74717 (comment)). - Add an debug assertion in `ensure_monomorphic_enough` to make sure that polymorphisation did what we expect. r? @lcnr
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Fixes #74636.
This PR adds a
used_generic_parameters_needs_substhelper function which checks whether a type needs substitution, but only for parameters that theunused_generic_paramsquery considers used. This is used in the MIR interpreter to make the check for some pointer casts and for reflection intrinsics more precise.I've opened this as a draft PR because this might not be the approach we want to fix this issue and we have to decide what to do about the reflection case.
r? @eddyb
cc @lcnr @wesleywiser