diff options
| -rw-r--r-- | compiler/rustc_trait_selection/src/traits/select/mod.rs | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs index a484b594418..60e13d9b8c3 100644 --- a/compiler/rustc_trait_selection/src/traits/select/mod.rs +++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs @@ -1525,6 +1525,12 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> { other: &EvaluatedCandidate<'tcx>, needs_infer: bool, ) -> bool { + // HACK(eddyb) remove instruction-counting noise from `-Z self-profile`. + #[cfg(target_arch = "x86_64")] + unsafe { + std::arch::asm!("mfence", options(nostack)); + } + if victim.candidate == other.candidate { return true; } |