diff --git a/src/lib.rs b/src/lib.rs
index c527f4c..13623f1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -18,7 +18,7 @@ mod scoped_map;
 
 pub use errors::*;
 pub use ir::*;
-pub use ops::{Ieee32, Ieee64, Operator};
+pub use ops::{Ieee32, Ieee64, MemoryArg, Operator};
 
 mod interp;
 pub use interp::*;
diff --git a/src/op_traits.rs b/src/op_traits.rs
index bda859f..8e6a887 100644
--- a/src/op_traits.rs
+++ b/src/op_traits.rs
@@ -641,6 +641,20 @@ impl Operator {
     pub fn is_pure(&self) -> bool {
         self.effects().is_empty()
     }
+
+    pub fn is_call(&self) -> bool {
+        match self {
+            Operator::Call { .. } | Operator::CallIndirect { .. } => true,
+            _ => false,
+        }
+    }
+
+    pub fn accesses_memory(&self) -> bool {
+        self.effects().iter().any(|e| match e {
+            SideEffect::ReadMem | SideEffect::WriteMem => true,
+            _ => false,
+        })
+    }
 }
 
 impl std::fmt::Display for Operator {