diff --git a/brownie-config.yaml b/brownie-config.yaml
index 17e0433..1666623 100644
--- a/brownie-config.yaml
+++ b/brownie-config.yaml
@@ -13,7 +13,7 @@ compiler:
     version: 0.8.11
     remappings:
       - "@openzeppelin=OpenZeppelin/openzeppelin-contracts@4.1.0"
-
+    viaIR: true
     optimizer:
       details:
           yul: true
diff --git a/contracts/VM.sol b/contracts/VM.sol
index f4558a0..d73de20 100644
--- a/contracts/VM.sol
+++ b/contracts/VM.sol
@@ -29,6 +29,8 @@ abstract contract VM {
         self = address(this);
     }
 
+    function dispatch(bytes memory inputs) internal virtual returns (bool success, bytes memory ret) {}
+
     function _execute(bytes32[] calldata commands, bytes[] memory state)
       internal returns (bytes[] memory)
     {
@@ -61,14 +63,28 @@ abstract contract VM {
                     )
                 );
             } else if (flags & FLAG_CT_MASK == FLAG_CT_CALL) {
-                (success, outdata) = address(uint160(uint256(command))).call( // target
-                    // inputs
-                    state.buildInputs(
-                        //selector
-                        bytes4(command),
-                        indices
-                    )
-                );
+                address _target = address(uint160(uint256(command)));
+                bytes memory inputs = state.buildInputs(
+                    //selector
+                    bytes4(command),
+                    indices
+                ); 
+                success = false;
+
+                if (_target == address(this)) {
+                    (success, outdata) = dispatch(inputs);
+                }
+
+                if (!success) {
+                    (success, outdata) = _target.call( // target
+                        // inputs
+                        state.buildInputs(
+                            //selector
+                            bytes4(command),
+                            indices
+                        )
+                    );
+                }
             } else if (flags & FLAG_CT_MASK == FLAG_CT_STATICCALL) {
                 (success, outdata) = address(uint160(uint256(command))).staticcall( // target
                     // inputs
diff --git a/contracts/test/TestableVMWithMath.sol b/contracts/test/TestableVMWithMath.sol
new file mode 100644
index 0000000..2928968
--- /dev/null
+++ b/contracts/test/TestableVMWithMath.sol
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.11;
+
+import "../VM.sol";
+
+contract TestableVMWithMath is VM {
+    function execute(bytes32[] calldata commands, bytes[] memory state)
+        public
+        payable
+        returns (bytes[] memory)
+    {
+        return _execute(commands, state);
+    }
+
+    function sum(uint256 a, uint256 b) external pure returns (uint256) {
+        return a + b;
+    }
+
+
+    function dispatch(bytes memory inputs)
+        internal
+        override
+        returns (bool _success, bytes memory _ret)
+    {
+        bytes4 _selector = bytes4(bytes32(inputs));
+        if (this.sum.selector == _selector) {
+            uint256 a;
+            uint256 b;
+            assembly {
+                a := mload(add(inputs, 36))
+                b := mload(add(inputs, 68))
+            }
+            uint256 res = this.sum(a, b);
+            _ret = new bytes(32);
+            assembly {
+                mstore(add(_ret, 32), res)
+            }
+            return (true, _ret);
+        }
+    }
+}
diff --git a/tests/conftest.py b/tests/conftest.py
index df09379..8623212 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -23,6 +23,10 @@ def math(alice, Math):
     math_brownie = alice.deploy(Math)
     yield WeirollContract.createLibrary(math_brownie)
 
+@pytest.fixture(scope="module")
+def weiroll_vm_with_math(alice, TestableVMWithMath):
+    vm = alice.deploy(TestableVMWithMath)
+    yield vm
 
 @pytest.fixture(scope="module")
 def testContract(alice, TestContract):
diff --git a/tests/test_weiroll_local.py b/tests/test_weiroll_local.py
new file mode 100644
index 0000000..bdd780b
--- /dev/null
+++ b/tests/test_weiroll_local.py
@@ -0,0 +1,20 @@
+from brownie import Contract, accounts, Wei, chain, TestableVM
+from weiroll import WeirollContract, WeirollPlanner
+
+
+def test_vm_with_math(weiroll_vm_with_math):
+    weiroll_vm = weiroll_vm_with_math
+    whale = accounts.at("0x57757E3D981446D585Af0D9Ae4d7DF6D64647806", force=True)
+
+    planner = WeirollPlanner(weiroll_vm)
+    sum = planner.call(weiroll_vm, "sum", 1, 2)
+    sum_2 = planner.call(weiroll_vm, "sum", sum, 3)
+    sum_2 = planner.call(weiroll_vm, "sum", 3, sum_2)
+
+    cmds, state = planner.plan()
+    weiroll_tx = weiroll_vm.execute(
+        cmds, state, {"from": whale, "gas_limit": 8_000_000, "gas_price": 0}
+    )
+
+    print(weiroll_tx.return_value)
+    #assert False