diff --git a/src/vm/inst.rs b/src/vm/inst.rs
index 27b29a9..8604c4c 100644
--- a/src/vm/inst.rs
+++ b/src/vm/inst.rs
@@ -6,7 +6,8 @@ pub enum Inst {
     Add(Reg, Reg),
     Mul(Reg, Reg),
     Div(Reg, Reg),
-    Neg(Reg),
+    Mod(Reg, Reg),
+    INeg(Reg),
     And(Reg, Reg),
     Or(Reg, Reg),
     Xor(Reg, Reg),
@@ -21,7 +22,8 @@ pub enum Inst {
     Load(Reg, Reg),
     Store(Reg, Reg),
     StoreImm(Reg, u32),
-    Copy(Reg, Reg),
+    MemCopy(Reg, Reg),
+    RegCopy(Reg, Reg),
 
     Nop,
     Halt,
diff --git a/src/vm/vm.rs b/src/vm/vm.rs
index f93737d..d83b49a 100644
--- a/src/vm/vm.rs
+++ b/src/vm/vm.rs
@@ -164,7 +164,8 @@ impl Vm {
                 self.set_reg(r1, value);
             }
             Inst::Div(r1, r2) => map!(r1 = r1 / r2),
-            Inst::Neg(r1) => {
+            Inst::Mod(r1, r2) => map!(r1 = r1 % r2),
+            Inst::INeg(r1) => {
                 let value = self.get_reg(r1);
                 let ivalue = -i64::from_ne_bytes(value.to_ne_bytes());
                 let uvalue = u64::from_ne_bytes(ivalue.to_ne_bytes());
@@ -212,7 +213,11 @@ impl Vm {
             Inst::StoreImm(r1, value) => {
                 self.set_reg(r1, value as u64);
             }
-            Inst::Copy(r1, r2) => {
+            Inst::RegCopy(r1, r2) => {
+                let w1 = self.get_reg(r2);
+                self.set_reg(r1, w1);
+            }
+            Inst::MemCopy(r1, r2) => {
                 let w1 = self.load(r2);
                 self.store(r1, w1);
             }