diff options
Diffstat (limited to 'compiler/rustc_mir_transform/src/dest_prop.rs')
| -rw-r--r-- | compiler/rustc_mir_transform/src/dest_prop.rs | 10 |
1 files changed, 1 insertions, 9 deletions
diff --git a/compiler/rustc_mir_transform/src/dest_prop.rs b/compiler/rustc_mir_transform/src/dest_prop.rs index c57483a6811..abd1cd4e35a 100644 --- a/compiler/rustc_mir_transform/src/dest_prop.rs +++ b/compiler/rustc_mir_transform/src/dest_prop.rs @@ -153,15 +153,7 @@ pub(super) struct DestinationPropagation; impl<'tcx> crate::MirPass<'tcx> for DestinationPropagation { fn is_enabled(&self, sess: &rustc_session::Session) -> bool { - // For now, only run at MIR opt level 3. Two things need to be changed before this can be - // turned on by default: - // 1. Because of the overeager removal of storage statements, this can cause stack space - // regressions. This opt is not the place to fix this though, it's a more general - // problem in MIR. - // 2. Despite being an overall perf improvement, this still causes a 30% regression in - // keccak. We can temporarily fix this by bounding function size, but in the long term - // we should fix this by being smarter about invalidating analysis results. - sess.mir_opt_level() >= 3 + sess.mir_opt_level() >= 2 } #[tracing::instrument(level = "trace", skip(self, tcx, body))] |