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Optimize exhaustiveness checking perf a bit

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This commit is contained in:
Lukas Wirth 2024-04-15 19:35:48 +02:00
parent 597c293a69
commit 94e38261b3
7 changed files with 77 additions and 89 deletions
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11
crates/hir-ty/src/diagnostics/expr.rs
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@ -11,6 +11,7 @@ use hir_def::{ItemContainerId, Lookup};
use hir_expand::name;
use itertools::Itertools;
use rustc_hash::FxHashSet;
use rustc_pattern_analysis::constructor::Constructor;
use syntax::{ast, AstNode};
use tracing::debug;
use triomphe::Arc;
@ -266,15 +267,17 @@ impl ExprValidator {
let mut have_errors = false;
let deconstructed_pat = self.lower_pattern(&cx, pat, db, &mut have_errors);
// optimization, wildcard trivially hold
if have_errors || matches!(deconstructed_pat.ctor(), Constructor::Wildcard) {
continue;
}
let match_arm = rustc_pattern_analysis::MatchArm {
pat: pattern_arena.alloc(deconstructed_pat),
has_guard: false,
arm_data: (),
};
if have_errors {
continue;
}
let report = match cx.compute_match_usefulness(&[match_arm], ty.clone()) {
Ok(v) => v,
Err(e) => {