diff --git a/src/backend/mod.rs b/src/backend/mod.rs
index 5046953..8f3dbdf 100644
--- a/src/backend/mod.rs
+++ b/src/backend/mod.rs
@@ -514,6 +514,15 @@ impl<'a> WasmFuncBackend<'a> {
             Operator::MemoryGrow { mem } => {
                 Some(wasm_encoder::Instruction::MemoryGrow(mem.index() as u32))
             }
+            Operator::MemoryCopy { dst_mem, src_mem } => {
+                Some(wasm_encoder::Instruction::MemoryCopy {
+                    src_mem: src_mem.index() as u32,
+                    dst_mem: dst_mem.index() as u32,
+                })
+            }
+            Operator::MemoryFill { mem } => {
+                Some(wasm_encoder::Instruction::MemoryFill(mem.index() as u32))
+            }
         };
 
         if let Some(inst) = inst {
diff --git a/src/op_traits.rs b/src/op_traits.rs
index 8e6a887..2cb11e3 100644
--- a/src/op_traits.rs
+++ b/src/op_traits.rs
@@ -221,6 +221,8 @@ pub fn op_inputs(
         Operator::TableSize { .. } => Ok(Cow::Borrowed(&[])),
         Operator::MemorySize { .. } => Ok(Cow::Borrowed(&[])),
         Operator::MemoryGrow { .. } => Ok(Cow::Borrowed(&[Type::I32])),
+        Operator::MemoryCopy { .. } => Ok(Cow::Borrowed(&[Type::I32, Type::I32, Type::I32])),
+        Operator::MemoryFill { .. } => Ok(Cow::Borrowed(&[Type::I32, Type::I32, Type::I32])),
     }
 }
 
@@ -425,6 +427,8 @@ pub fn op_outputs(
         Operator::TableSize { .. } => Ok(Cow::Borrowed(&[Type::I32])),
         Operator::MemorySize { .. } => Ok(Cow::Borrowed(&[Type::I32])),
         Operator::MemoryGrow { .. } => Ok(Cow::Borrowed(&[Type::I32])),
+        Operator::MemoryCopy { .. } => Ok(Cow::Borrowed(&[])),
+        Operator::MemoryFill { .. } => Ok(Cow::Borrowed(&[])),
     }
 }
 
@@ -635,6 +639,8 @@ impl Operator {
             Operator::TableSize { .. } => &[ReadTable],
             Operator::MemorySize { .. } => &[ReadMem],
             Operator::MemoryGrow { .. } => &[WriteMem, Trap],
+            Operator::MemoryCopy { .. } => &[Trap, ReadMem, WriteMem],
+            Operator::MemoryFill { .. } => &[Trap, WriteMem],
         }
     }
 
@@ -853,6 +859,10 @@ impl std::fmt::Display for Operator {
             Operator::TableSize { table_index, .. } => write!(f, "table_size<{}>", table_index)?,
             Operator::MemorySize { mem } => write!(f, "memory_size<{}>", mem)?,
             Operator::MemoryGrow { mem } => write!(f, "memory_grow<{}>", mem)?,
+            Operator::MemoryCopy { dst_mem, src_mem } => {
+                write!(f, "memory_copy<{}, {}>", dst_mem, src_mem)?
+            }
+            Operator::MemoryFill { mem } => write!(f, "memory_fill<{}>", mem)?,
         }
 
         Ok(())
diff --git a/src/ops.rs b/src/ops.rs
index ea7851d..f63a0bd 100644
--- a/src/ops.rs
+++ b/src/ops.rs
@@ -295,6 +295,13 @@ pub enum Operator {
     MemoryGrow {
         mem: Memory,
     },
+    MemoryCopy {
+        dst_mem: Memory,
+        src_mem: Memory,
+    },
+    MemoryFill {
+        mem: Memory,
+    },
 }
 
 #[test]
@@ -568,6 +575,13 @@ impl<'a, 'b> std::convert::TryFrom<&'b wasmparser::Operator<'a>> for Operator {
             &wasmparser::Operator::MemoryGrow { mem, .. } => Ok(Operator::MemoryGrow {
                 mem: Memory::from(mem),
             }),
+            &wasmparser::Operator::MemoryCopy { dst_mem, src_mem } => Ok(Operator::MemoryCopy {
+                dst_mem: Memory::from(dst_mem),
+                src_mem: Memory::from(src_mem),
+            }),
+            &wasmparser::Operator::MemoryFill { mem } => {
+                Ok(Operator::MemoryFill { mem: Memory::from(mem) })
+            }
             _ => Err(()),
         }
     }