diff options
| -rw-r--r-- | compiler/rustc_mir_transform/src/unreachable_prop.rs | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/compiler/rustc_mir_transform/src/unreachable_prop.rs b/compiler/rustc_mir_transform/src/unreachable_prop.rs index a7e522beeab..56d7799a125 100644 --- a/compiler/rustc_mir_transform/src/unreachable_prop.rs +++ b/compiler/rustc_mir_transform/src/unreachable_prop.rs @@ -12,9 +12,8 @@ pub struct UnreachablePropagation; impl MirPass<'_> for UnreachablePropagation { fn is_enabled(&self, sess: &rustc_session::Session) -> bool { - // Enable only under -Zmir-opt-level=4 as in some cases (check the deeply-nested-opt - // perf benchmark) LLVM may spend quite a lot of time optimizing the generated code. - sess.mir_opt_level() >= 4 + // Enable only under -Zmir-opt-level=2 as this can make programs less debuggable. + sess.mir_opt_level() >= 2 } fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) { |