Reapply "WIP"

This reverts commit f209f06.

Author: laurmaedje

src/input.rs

@@ -102,12 +102,13 @@ where
 
     #[inline]
     fn call(&self, call: Self::Call) -> u128 {
-        // if let Some(accelerator) = crate::accelerate::get(self.id) {
-        //     let mut map = accelerator.lock();
-        //     let call_hash = crate::constraint::hash(&call);
-        //     return *map.entry(call_hash).or_insert_with(|| self.value.call(call));
-        // }
-        let hash = self.value.call(call.clone());
+        let hash = if let Some(accelerator) = crate::accelerate::get(self.id) {
+            let mut map = accelerator.lock();
+            let call_hash = crate::constraint::hash(&call);
+            *map.entry(call_hash).or_insert_with(|| self.value.call(call.clone()))
+        } else {
+            self.value.call(call.clone())
+        };
         if let Some(sink) = self.sink {
             sink(call, hash)
         }