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Auto merge of #90746 - nnethercote:opt-pattern-matching, r=Nadrieril

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Optimize pattern matching

These commits speed up the `match-stress-enum` benchmark, which is very artificial, but the changes are simple enough that it's probably worth doing.

r? `@Nadrieril`
This commit is contained in:
bors 2021-11-11 18:26:49 +00:00
commit 936238a92b
1 changed files with 1 additions and 1 deletions
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2
compiler/rustc_mir_build/src/thir/pattern/usefulness.rs
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@ -797,7 +797,7 @@ fn is_useful<'p, 'tcx>(
return ret;
}
assert!(rows.iter().all(|r| r.len() == v.len()));
debug_assert!(rows.iter().all(|r| r.len() == v.len()));
let ty = v.head().ty();
let is_non_exhaustive = cx.is_foreign_non_exhaustive_enum(ty);