Remove cache-on-disk from query check_liveness

Zalathar · Zalathar · commit d9b7a6774e49 · 2026-03-06T21:44:20.000+11:00
This is the only query with a cache-on-disk condition other than `true` or
is-local. Removing its cache-on-disk modifier entirely appears to not cause any
serious perf regressions.
diff --git a/compiler/rustc_middle/src/queries.rs b/compiler/rustc_middle/src/queries.rs
@@ -1218,7 +1218,6 @@ rustc_queries! {
     query check_liveness(key: LocalDefId) -> &'tcx rustc_index::bit_set::DenseBitSet<abi::FieldIdx> {
         arena_cache
         desc { "checking liveness of variables in `{}`", tcx.def_path_str(key.to_def_id()) }
-        cache_on_disk_if { tcx.is_typeck_child(key.to_def_id()) }
     }
 
     /// Return the live symbols in the crate for dead code check.

Original file line number	Diff line number	Diff line change
`@@ -1218,7 +1218,6 @@ rustc_queries! {`
`1218`	`1218`	`query check_liveness(key: LocalDefId) -> &'tcx rustc_index::bit_set::DenseBitSet<abi::FieldIdx> {`
`1219`	`1219`	`arena_cache`
`1220`	`1220`	desc { "checking liveness of variables in `{}`", tcx.def_path_str(key.to_def_id()) }
`1221`		`- cache_on_disk_if { tcx.is_typeck_child(key.to_def_id()) }`
`1222`	`1221`	`}`
`1223`	`1222`
`1224`	`1223`	`/// Return the live symbols in the crate for dead code check.`