diff --git a/asl_xdsl/dialects/asl.py b/asl_xdsl/dialects/asl.py
index cc1d0b3..18c39d1 100644
--- a/asl_xdsl/dialects/asl.py
+++ b/asl_xdsl/dialects/asl.py
@@ -151,7 +151,14 @@ def parse_parameter(cls, parser: AttrParser) -> bool:
 
     def print_parameter(self, printer: Printer) -> None:
         """Print the attribute parameter."""
-        printer.print("true" if self.data else "false")
+        printer.print("<true>" if self.data else "<false>")
+
+
+@irdl_attr_definition
+class StringType(ParametrizedAttribute, TypeAttribute):
+    """A string type."""
+
+    name = "asl.string"
 
 
 @irdl_attr_definition
@@ -323,7 +330,7 @@ def __init__(
     @classmethod
     def parse(cls, parser: Parser) -> ConstantIntOp:
         """Parse the operation."""
-        value = parser.parse_integer(allow_boolean=False, allow_negative=False)
+        value = parser.parse_integer(allow_boolean=False, allow_negative=True)
         attr_dict = parser.parse_optional_attr_dict()
         return ConstantIntOp(value, attr_dict)
 
@@ -377,6 +384,29 @@ def print(self, printer: Printer) -> None:
             printer.print_attr_dict(self.attributes)
 
 
+@irdl_op_definition
+class ConstantStringOp(IRDLOperation):
+    """A constant string operation."""
+
+    name = "asl.constant_string"
+
+    value = prop_def(builtin.StringAttr)
+    res = result_def(StringType)
+
+    assembly_format = "$value attr-dict"
+
+    def __init__(
+        self, value: str | builtin.StringAttr, attr_dict: Mapping[str, Attribute] = {}
+    ):
+        if isinstance(value, str):
+            value = builtin.StringAttr(value)
+        super().__init__(
+            result_types=[StringType()],
+            properties={"value": value},
+            attributes=attr_dict,
+        )
+
+
 @irdl_op_definition
 class NotOp(IRDLOperation):
     """A bitwise NOT operation."""
@@ -396,6 +426,25 @@ def __init__(self, arg: SSAValue, attr_dict: Mapping[str, Attribute] = {}):
         )
 
 
+@irdl_op_definition
+class BoolToI1Op(IRDLOperation):
+    """A hack to convert !asl.bool to i1 so that we can use scf.if."""
+
+    name = "asl.bool_to_i1"
+
+    arg = operand_def(BoolType())
+    res = result_def(builtin.IntegerType(1))
+
+    assembly_format = "$arg `:` type($arg) `->` type($res) attr-dict"
+
+    def __init__(self, arg: SSAValue, attr_dict: Mapping[str, Attribute] = {}):
+        super().__init__(
+            operands=[arg],
+            result_types=[builtin.IntegerType(1)],
+            attributes=attr_dict,
+        )
+
+
 class BinaryBoolOp(IRDLOperation):
     """A binary boolean operation."""
 
@@ -464,7 +513,7 @@ class EquivBoolOp(BinaryBoolOp):
 class NegateIntOp(IRDLOperation):
     """An integer negation operation."""
 
-    name = "asl.negate_int"
+    name = "asl.neg_int"
 
     arg = operand_def(IntegerType)
     res = result_def(IntegerType)
@@ -535,14 +584,14 @@ class ExpIntOp(BinaryIntOp):
 class ShiftLeftIntOp(BinaryIntOp):
     """An integer left shift operation."""
 
-    name = "asl.shiftleft_int"
+    name = "asl.shl_int"
 
 
 @irdl_op_definition
 class ShiftRightIntOp(BinaryIntOp):
     """An integer right shift operation."""
 
-    name = "asl.shiftright_int"
+    name = "asl.shr_int"
 
 
 @irdl_op_definition
@@ -1052,7 +1101,9 @@ def __init__(
         ConstantBoolOp,
         ConstantIntOp,
         ConstantBitVectorOp,
+        ConstantStringOp,
         # Boolean operations
+        BoolToI1Op,
         NotOp,
         AndBoolOp,
         OrBoolOp,
@@ -1095,5 +1146,12 @@ def __init__(
         # Slices
         SliceSingleOp,
     ],
-    [BoolType, BoolAttr, IntegerType, BitVectorType, BitVectorAttr],
+    [
+        BoolType,
+        BoolAttr,
+        IntegerType,
+        BitVectorType,
+        BitVectorAttr,
+        StringType,
+    ],
 )
diff --git a/asl_xdsl/interpreters/asl.py b/asl_xdsl/interpreters/asl.py
index 414b4af..08e606c 100644
--- a/asl_xdsl/interpreters/asl.py
+++ b/asl_xdsl/interpreters/asl.py
@@ -40,6 +40,14 @@ def run_call(
     ) -> tuple[Any, ...]:
         return interpreter.call_op(op.callee.string_value(), args)
 
+    @impl(asl.NegateIntOp)
+    def run_neg_int(
+        self, interpreter: Interpreter, op: asl.NegateIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        arg: int
+        [arg] = args
+        return (0 - arg,)
+
     @impl(asl.AddIntOp)
     def run_add_int(
         self, interpreter: Interpreter, op: asl.AddIntOp, args: tuple[Any, ...]
@@ -49,16 +57,132 @@ def run_add_int(
         (lhs, rhs) = args
         return (lhs + rhs,)
 
+    @impl(asl.SubIntOp)
+    def run_sub_int(
+        self, interpreter: Interpreter, op: asl.SubIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        return (lhs - rhs,)
+
+    @impl(asl.MulIntOp)
+    def run_mul_int(
+        self, interpreter: Interpreter, op: asl.MulIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        return (lhs * rhs,)
+
+    @impl(asl.ShiftLeftIntOp)
+    def run_shl_int(
+        self, interpreter: Interpreter, op: asl.ShiftLeftIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        assert rhs >= 0
+        return (lhs << rhs,)
+
+    @impl(asl.ShiftRightIntOp)
+    def run_shr_int(
+        self, interpreter: Interpreter, op: asl.ShiftRightIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        assert rhs >= 0
+        return (lhs >> rhs,)
+
+    @impl(asl.EqIntOp)
+    def run_eq_int(
+        self, interpreter: Interpreter, op: asl.EqIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        return (lhs == rhs,)
+
+    @impl(asl.NeIntOp)
+    def run_ne_int(
+        self, interpreter: Interpreter, op: asl.NeIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        return (lhs != rhs,)
+
+    @impl(asl.LeIntOp)
+    def run_le_int(
+        self, interpreter: Interpreter, op: asl.LeIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        return (lhs <= rhs,)
+
+    @impl(asl.LtIntOp)
+    def run_lt_int(
+        self, interpreter: Interpreter, op: asl.LtIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        return (lhs < rhs,)
+
+    @impl(asl.GeIntOp)
+    def run_ge_int(
+        self, interpreter: Interpreter, op: asl.GeIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        return (lhs >= rhs,)
+
+    @impl(asl.GtIntOp)
+    def run_gt_int(
+        self, interpreter: Interpreter, op: asl.GtIntOp, args: tuple[Any, ...]
+    ) -> tuple[Any, ...]:
+        lhs: int
+        rhs: int
+        (lhs, rhs) = args
+        return (lhs > rhs,)
+
     @impl(asl.ConstantIntOp)
-    def run_constant(
+    def run_constant_int(
         self, interpreter: Interpreter, op: asl.ConstantIntOp, args: PythonValues
     ) -> PythonValues:
         value = op.value
         return (value.data,)
 
+    @impl(asl.ConstantStringOp)
+    def run_constant_string(
+        self, interpreter: Interpreter, op: asl.ConstantStringOp, args: PythonValues
+    ) -> PythonValues:
+        value = op.value
+        return (value.data,)
+
+    @impl(asl.BoolToI1Op)
+    def run_bool_to_i1(
+        self, interpreter: Interpreter, op: asl.BoolToI1Op, args: PythonValues
+    ) -> PythonValues:
+        arg: int
+        [arg] = args
+        return (arg,)
+
     # region built-in function implementations
 
-    @impl_external("asl_print_int_dec")
+    @impl_external("print_bits_hex.0")
+    def asl_print_bits_hex(
+        self, interpreter: Interpreter, op: Operation, args: PythonValues
+    ) -> PythonValues:
+        arg: int
+        (arg,) = args
+        interpreter.print(hex(arg))
+        return ()
+
+    @impl_external("print_int_dec.0")
     def asl_print_int_dec(
         self, interpreter: Interpreter, op: Operation, args: PythonValues
     ) -> PythonValues:
@@ -67,7 +191,16 @@ def asl_print_int_dec(
         interpreter.print(arg)
         return ()
 
-    @impl_external("asl_print_char")
+    @impl_external("print_int_hex.0")
+    def asl_print_int_hex(
+        self, interpreter: Interpreter, op: Operation, args: PythonValues
+    ) -> PythonValues:
+        arg: int
+        (arg,) = args
+        interpreter.print(hex(arg))
+        return ()
+
+    @impl_external("print_char.0")
     def asl_print_char(
         self, interpreter: Interpreter, op: Operation, args: PythonValues
     ) -> PythonValues:
@@ -76,4 +209,13 @@ def asl_print_char(
         interpreter.print(chr(arg))
         return ()
 
+    @impl_external("print_str.0")
+    def asl_print_string(
+        self, interpreter: Interpreter, op: Operation, args: PythonValues
+    ) -> PythonValues:
+        arg: str
+        (arg,) = args
+        interpreter.print(arg)
+        return ()
+
     # endregion
diff --git a/tests/filecheck/dialects/asl/cf.mlir b/tests/filecheck/dialects/asl/cf.mlir
new file mode 100644
index 0000000..142b597
--- /dev/null
+++ b/tests/filecheck/dialects/asl/cf.mlir
@@ -0,0 +1,25 @@
+// RUN: asl-opt %s | asl-opt %s | filecheck %s
+
+builtin.module {
+    asl.func @print_str.0(%x : !asl.string) -> ()
+    %c = asl.constant_bool true {attr_dict}
+    %0 = asl.bool_to_i1 %c : !asl.bool -> i1
+    scf.if %0 {
+        %1 = asl.constant_string "TRUE" {attr_dict}
+        asl.call @print_str.0(%1) : (!asl.string) -> ()
+    } else {
+        %2 = asl.constant_string "FALSE" {attr_dict}
+        asl.call @print_str.0(%2) : (!asl.string) -> ()
+    }
+
+// CHECK:        %c = asl.constant_bool true {attr_dict}
+// CHECK-NEXT:   %0 = asl.bool_to_i1 %c : !asl.bool -> i1
+// CHECK-NEXT:   scf.if %0 {
+// CHECK-NEXT:     %1 = asl.constant_string "TRUE" {attr_dict}
+// CHECK-NEXT:     asl.call @print_str.0(%1) : (!asl.string) -> ()
+// CHECK-NEXT:   } else {
+// CHECK-NEXT:     %2 = asl.constant_string "FALSE" {attr_dict}
+// CHECK-NEXT:     asl.call @print_str.0(%2) : (!asl.string) -> ()
+// CHECK-NEXT:   }
+
+}
diff --git a/tests/filecheck/dialects/asl/constant_ops.mlir b/tests/filecheck/dialects/asl/constant_ops.mlir
index a96e056..0c15b27 100644
--- a/tests/filecheck/dialects/asl/constant_ops.mlir
+++ b/tests/filecheck/dialects/asl/constant_ops.mlir
@@ -7,6 +7,8 @@ builtin.module {
     %fourty_two = asl.constant_int 42 {attr_dict}
 
     %fourty_two_bits = asl.constant_bits 42 : !asl.bits<32> {attr_dict}
+
+    %fourty_two_string = asl.constant_string "Forty Two" {attr_dict}
 }
 
 // CHECK:       builtin.module {
@@ -14,4 +16,5 @@ builtin.module {
 // CHECK-NEXT:    %false = asl.constant_bool true {attr_dict}
 // CHECK-NEXT:    %fourty_two = asl.constant_int 42 {attr_dict}
 // CHECK-NEXT:    %fourty_two_bits = asl.constant_bits 42 : !asl.bits<32> {attr_dict}
+// CHECK-NEXT:    %fourty_two_string = asl.constant_string "Forty Two" {attr_dict}
 // CHECK-NEXT:  }
diff --git a/tests/filecheck/dialects/asl/primitives.mlir b/tests/filecheck/dialects/asl/primitives.mlir
index e5f541b..fb6b952 100644
--- a/tests/filecheck/dialects/asl/primitives.mlir
+++ b/tests/filecheck/dialects/asl/primitives.mlir
@@ -24,24 +24,24 @@ builtin.module {
     %int1, %int2 = "test.op"() : () -> (!asl.int, !asl.int)
 // CHECK-NEXT:    %int1, %int2 = "test.op"() : () -> (!asl.int, !asl.int)
 
-    %negate_int = asl.negate_int %int1 : !asl.int -> !asl.int
+    %neg_int = asl.neg_int %int1 : !asl.int -> !asl.int
     %add_int = asl.add_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
     %sub_int = asl.sub_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
     %mul_int = asl.mul_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
     %exp_int = asl.exp_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
-    %shiftleft_int = asl.shiftleft_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
-    %shiftright_int = asl.shiftright_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
+    %shiftleft_int = asl.shl_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
+    %shiftright_int = asl.shr_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
     %div_int = asl.div_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
     %fdiv_int = asl.fdiv_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
     %frem_int = asl.frem_int %int1, %int2 : (!asl.int, !asl.int) -> !asl.int
 
-// CHECK-NEXT:    %negate_int = asl.negate_int %int1
+// CHECK-NEXT:    %neg_int = asl.neg_int %int1
 // CHECK-NEXT:    %add_int = asl.add_int %int1, %int2
 // CHECK-NEXT:    %sub_int = asl.sub_int %int1, %int2
 // CHECK-NEXT:    %mul_int = asl.mul_int %int1, %int2
 // CHECK-NEXT:    %exp_int = asl.exp_int %int1, %int2
-// CHECK-NEXT:    %shiftleft_int = asl.shiftleft_int %int1, %int2
-// CHECK-NEXT:    %shiftright_int = asl.shiftright_int %int1, %int2
+// CHECK-NEXT:    %shiftleft_int = asl.shl_int %int1, %int2
+// CHECK-NEXT:    %shiftright_int = asl.shr_int %int1, %int2
 // CHECK-NEXT:    %div_int = asl.div_int %int1, %int2
 // CHECK-NEXT:    %fdiv_int = asl.fdiv_int %int1, %int2
 // CHECK-NEXT:    %frem_int = asl.frem_int %int1, %int2
diff --git a/tests/filecheck/dialects/asl/types_attrs.mlir b/tests/filecheck/dialects/asl/types_attrs.mlir
index c8e4d30..ac2b60a 100644
--- a/tests/filecheck/dialects/asl/types_attrs.mlir
+++ b/tests/filecheck/dialects/asl/types_attrs.mlir
@@ -5,7 +5,7 @@ builtin.module {
     "test.op"() {bool_true = #asl.bool_attr<true>, bool_false = #asl.bool_attr<false>} : () -> ()
 
 // CHECK:         "test.op"() {bool_type = !asl.bool} : () -> ()
-// CHECK-NEXT:    "test.op"() {bool_true = #asl.bool_attrtrue, bool_false = #asl.bool_attrfalse} : () -> ()
+// CHECK-NEXT:    "test.op"() {bool_true = #asl.bool_attr<true>, bool_false = #asl.bool_attr<false>} : () -> ()
 
     "test.op"() {int_type = !asl.int} : () -> ()
     "test.op"() {constraint_int = !asl.int<42>} : () -> ()
@@ -24,4 +24,6 @@ builtin.module {
 
 // CHECK-NEXT:    "test.op"() {bits_type = !asl.bits<32>} : () -> ()
 // CHECK-NEXT:    "test.op"() {bits_attr = #asl.bits_attr<42 : 32>} : () -> ()
+
+    "test.op"() {string_type = !asl.string} : () -> ()
 }
diff --git a/tests/filecheck/exec/t2.mlir b/tests/filecheck/exec/t2.mlir
index 846946f..e93b9ef 100644
--- a/tests/filecheck/exec/t2.mlir
+++ b/tests/filecheck/exec/t2.mlir
@@ -2,14 +2,14 @@
 
 // CHECK: 3
 
-asl.func @asl_print_int_dec(!asl.int)
-asl.func @asl_print_char(!asl.int)
+asl.func @print_int_dec.0(!asl.int)
+asl.func @print_char.0(!asl.int)
 
 asl.func @main.0() -> !asl.int {
     %0 = asl.constant_int 1 {attr_dict}
     %1 = asl.constant_int 2 {attr_dict}
     %2 = asl.call @Test.0(%0, %1) : (!asl.int, !asl.int) -> !asl.int
-    asl.call @asl_print_int_dec (%2) : (!asl.int) -> ()
+    asl.call @print_int_dec.0 (%2) : (!asl.int) -> ()
 
     asl.call @println.0() : () -> ()
 
@@ -24,6 +24,6 @@ asl.func @Test.0(%x : !asl.int, %y : !asl.int) -> !asl.int {
 
 asl.func @println.0() -> () {
     %0 = asl.constant_int 10 {attr_dict}
-    asl.call @asl_print_char(%0) : (!asl.int) -> ()
+    asl.call @print_char.0(%0) : (!asl.int) -> ()
     asl.return
 }