diff options
Diffstat (limited to 'compiler/rustc_data_structures/src/obligation_forest/mod.rs')
| -rw-r--r-- | compiler/rustc_data_structures/src/obligation_forest/mod.rs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/compiler/rustc_data_structures/src/obligation_forest/mod.rs b/compiler/rustc_data_structures/src/obligation_forest/mod.rs index 07a96dd7d..e351b650a 100644 --- a/compiler/rustc_data_structures/src/obligation_forest/mod.rs +++ b/compiler/rustc_data_structures/src/obligation_forest/mod.rs @@ -117,6 +117,10 @@ pub trait ObligationProcessor { } /// The result type used by `process_obligation`. +// `repr(C)` to inhibit the niche filling optimization. Otherwise, the `match` appearing +// in `process_obligations` is significantly slower, which can substantially affect +// benchmarks like `rustc-perf`'s inflate and keccak. +#[repr(C)] #[derive(Debug)] pub enum ProcessResult<O, E> { Unchanged, |