diff --git a/src/librustc/ty/context.rs b/src/librustc/ty/context.rs
index 04d96e362a465..3d44fda9a5eec 100644
--- a/src/librustc/ty/context.rs
+++ b/src/librustc/ty/context.rs
@@ -1926,6 +1926,7 @@ pub mod tls {
     /// to `value` during the call to `f`. It is restored to its previous value after.
     /// This is used to set the pointer to the new ImplicitCtxt.
     #[cfg(parallel_queries)]
+    #[inline]
     fn set_tlv<F: FnOnce() -> R, R>(value: usize, f: F) -> R {
         rayon_core::tlv::with(value, f)
     }
@@ -1933,6 +1934,7 @@ pub mod tls {
     /// Gets Rayon's thread local variable which is preserved for Rayon jobs.
     /// This is used to get the pointer to the current ImplicitCtxt.
     #[cfg(parallel_queries)]
+    #[inline]
     fn get_tlv() -> usize {
         rayon_core::tlv::get()
     }
@@ -1945,6 +1947,7 @@ pub mod tls {
     /// It is restored to its previous value after.
     /// This is used to set the pointer to the new ImplicitCtxt.
     #[cfg(not(parallel_queries))]
+    #[inline]
     fn set_tlv<F: FnOnce() -> R, R>(value: usize, f: F) -> R {
         let old = get_tlv();
         let _reset = OnDrop(move || TLV.with(|tlv| tlv.set(old)));
diff --git a/src/librustc/ty/query/plumbing.rs b/src/librustc/ty/query/plumbing.rs
index a73b92ed713ec..005a6a21394dc 100644
--- a/src/librustc/ty/query/plumbing.rs
+++ b/src/librustc/ty/query/plumbing.rs
@@ -499,37 +499,48 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
 
         // If -Zincremental-verify-ich is specified, re-hash results from
         // the cache and make sure that they have the expected fingerprint.
-        if self.sess.opts.debugging_opts.incremental_verify_ich {
-            use rustc_data_structures::stable_hasher::{StableHasher, HashStable};
-            use ich::Fingerprint;
+        if unlikely!(self.sess.opts.debugging_opts.incremental_verify_ich) {
+            self.incremental_verify_ich::<Q>(&result, dep_node, dep_node_index);
+        }
 
-            assert!(Some(self.dep_graph.fingerprint_of(dep_node_index)) ==
-                    self.dep_graph.prev_fingerprint_of(dep_node),
-                    "Fingerprint for green query instance not loaded \
-                     from cache: {:?}", dep_node);
+        if unlikely!(self.sess.opts.debugging_opts.query_dep_graph) {
+            self.dep_graph.mark_loaded_from_cache(dep_node_index, true);
+        }
 
-            debug!("BEGIN verify_ich({:?})", dep_node);
-            let mut hcx = self.create_stable_hashing_context();
-            let mut hasher = StableHasher::new();
+        job.complete(&result, dep_node_index);
 
-            result.hash_stable(&mut hcx, &mut hasher);
+        Ok(result)
+    }
 
-            let new_hash: Fingerprint = hasher.finish();
-            debug!("END verify_ich({:?})", dep_node);
+    #[inline(never)]
+    #[cold]
+    fn incremental_verify_ich<Q: QueryDescription<'gcx>>(
+        self,
+        result: &Q::Value,
+        dep_node: &DepNode,
+        dep_node_index: DepNodeIndex,
+    ) {
+        use rustc_data_structures::stable_hasher::{StableHasher, HashStable};
+        use ich::Fingerprint;
 
-            let old_hash = self.dep_graph.fingerprint_of(dep_node_index);
+        assert!(Some(self.dep_graph.fingerprint_of(dep_node_index)) ==
+                self.dep_graph.prev_fingerprint_of(dep_node),
+                "Fingerprint for green query instance not loaded \
+                    from cache: {:?}", dep_node);
 
-            assert!(new_hash == old_hash, "Found unstable fingerprints \
-                for {:?}", dep_node);
-        }
+        debug!("BEGIN verify_ich({:?})", dep_node);
+        let mut hcx = self.create_stable_hashing_context();
+        let mut hasher = StableHasher::new();
 
-        if self.sess.opts.debugging_opts.query_dep_graph {
-            self.dep_graph.mark_loaded_from_cache(dep_node_index, true);
-        }
+        result.hash_stable(&mut hcx, &mut hasher);
 
-        job.complete(&result, dep_node_index);
+        let new_hash: Fingerprint = hasher.finish();
+        debug!("END verify_ich({:?})", dep_node);
 
-        Ok(result)
+        let old_hash = self.dep_graph.fingerprint_of(dep_node_index);
+
+        assert!(new_hash == old_hash, "Found unstable fingerprints \
+            for {:?}", dep_node);
     }
 
     fn force_query_with_job<Q: QueryDescription<'gcx>>(
@@ -574,7 +585,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
 
         let ((result, dep_node_index), diagnostics) = res;
 
-        if self.sess.opts.debugging_opts.query_dep_graph {
+        if unlikely!(self.sess.opts.debugging_opts.query_dep_graph) {
             self.dep_graph.mark_loaded_from_cache(dep_node_index, false);
         }
 
diff --git a/src/librustc_data_structures/lib.rs b/src/librustc_data_structures/lib.rs
index bc2b8f1d6523e..9d0201a9e38b1 100644
--- a/src/librustc_data_structures/lib.rs
+++ b/src/librustc_data_structures/lib.rs
@@ -113,12 +113,14 @@ pub struct OnDrop<F: Fn()>(pub F);
 impl<F: Fn()> OnDrop<F> {
       /// Forgets the function which prevents it from running.
       /// Ensure that the function owns no memory, otherwise it will be leaked.
+      #[inline]
       pub fn disable(self) {
             std::mem::forget(self);
       }
 }
 
 impl<F: Fn()> Drop for OnDrop<F> {
+      #[inline]
       fn drop(&mut self) {
             (self.0)();
       }