diff --git a/asl_xdsl/dialects/asl.py b/asl_xdsl/dialects/asl.py
new file mode 100644
index 0000000..34286a1
--- /dev/null
+++ b/asl_xdsl/dialects/asl.py
@@ -0,0 +1,166 @@
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+from xdsl.dialects import builtin
+from xdsl.ir import (
+    Attribute,
+    Data,
+    Dialect,
+    ParametrizedAttribute,
+    TypeAttribute,
+    VerifyException,
+)
+from xdsl.irdl import ParameterDef, irdl_attr_definition
+from xdsl.parser import AttrParser
+from xdsl.printer import Printer
+
+
+@irdl_attr_definition
+class BoolType(ParametrizedAttribute, TypeAttribute):
+    """A boolean type."""
+
+    name = "asl.bool"
+
+
+@irdl_attr_definition
+class BoolAttr(Data[bool]):
+    """A boolean attribute."""
+
+    name = "asl.bool_attr"
+
+    @classmethod
+    def parse_parameter(cls, parser: AttrParser) -> bool:
+        """Parse the attribute parameter."""
+        parser.parse_characters("<")
+        value = parser.parse_boolean()
+        parser.parse_characters(">")
+        return value
+
+    def print_parameter(self, printer: Printer) -> None:
+        """Print the attribute parameter."""
+        printer.print("true" if self.data else "false")
+
+
+@irdl_attr_definition
+class IntegerType(ParametrizedAttribute, TypeAttribute):
+    """An arbitrary-precision integer type."""
+
+    name = "asl.int"
+
+
+@irdl_attr_definition
+class IntegerAttr(ParametrizedAttribute):
+    """An arbitrary-precision integer attribute."""
+
+    name = "asl.int_attr"
+
+    value: ParameterDef[builtin.IntAttr]
+
+    def __init__(self, value: int | builtin.IntAttr):
+        if isinstance(value, int):
+            value = builtin.IntAttr(value)
+        super().__init__([value])
+
+    @classmethod
+    def parse_parameters(cls, parser: AttrParser) -> Sequence[Attribute]:
+        """Parse the attribute parameters."""
+        parser.parse_characters("<")
+        value = builtin.IntAttr(parser.parse_integer())
+        parser.parse_characters(">")
+        return [value]
+
+    def print_parameters(self, printer: Printer) -> None:
+        """Print the attribute parameters."""
+        printer.print("<")
+        printer.print(self.value.data)
+        printer.print(">")
+
+
+@irdl_attr_definition
+class BitVectorType(ParametrizedAttribute, TypeAttribute):
+    """A bit vector type."""
+
+    name = "asl.bits"
+
+    width: ParameterDef[builtin.IntAttr]
+
+    def __init__(self, width: int | builtin.IntAttr):
+        if isinstance(width, int):
+            width = builtin.IntAttr(width)
+        super().__init__([width])
+
+    @classmethod
+    def parse_parameters(cls, parser: AttrParser) -> Sequence[Attribute]:
+        """Parse the attribute parameters."""
+        parser.parse_characters("<")
+        width = builtin.IntAttr(parser.parse_integer())
+        parser.parse_characters(">")
+        return [width]
+
+    def print_parameters(self, printer: Printer) -> None:
+        """Print the attribute parameters."""
+        printer.print("<")
+        printer.print(self.width.data)
+        printer.print(">")
+
+
+@irdl_attr_definition
+class BitVectorAttr(ParametrizedAttribute):
+    """A bit vector attribute."""
+
+    name = "asl.bits_attr"
+
+    value: ParameterDef[builtin.IntAttr]
+    width: ParameterDef[builtin.IntAttr]
+
+    def maximum_value(self) -> int:
+        """Return the maximum value that can be represented."""
+        return (1 << self.width.data) - 1
+
+    @staticmethod
+    def normalize_value(value: int, width: int) -> int:
+        """Normalize the value to the range [0, 2^width)."""
+        max_value = 1 << width
+        return ((value % max_value) + max_value) % max_value
+
+    def __init__(self, value: int | builtin.IntAttr, width: int | builtin.IntAttr):
+        if isinstance(value, int):
+            value = builtin.IntAttr(value)
+        if isinstance(width, int):
+            width = builtin.IntAttr(width)
+
+        value_int = value.data
+        value = builtin.IntAttr(self.normalize_value(value_int, width.data))
+        super().__init__([value, width])
+
+    def _verify(self) -> None:
+        if self.value.data < 0 or self.value.data >= self.maximum_value():
+            raise VerifyException(
+                f"Value {self.value.data} is out of range for width {self.width.data}"
+            )
+
+    @classmethod
+    def parse_parameters(cls, parser: AttrParser) -> Sequence[Attribute]:
+        """Parse the attribute parameters."""
+        parser.parse_characters("<")
+        value = builtin.IntAttr(parser.parse_integer())
+        parser.parse_characters(":")
+        width = builtin.IntAttr(parser.parse_integer())
+        parser.parse_characters(">")
+        return [value, width]
+
+    def print_parameters(self, printer: Printer) -> None:
+        """Print the attribute parameters."""
+        printer.print("<")
+        printer.print(self.value.data)
+        printer.print(" : ")
+        printer.print(self.width.data)
+        printer.print(">")
+
+
+ASLDialect = Dialect(
+    "asl",
+    [],
+    [BoolType, BoolAttr, IntegerType, IntegerAttr, BitVectorType, BitVectorAttr],
+)
diff --git a/asl_xdsl/tools/asl_opt.py b/asl_xdsl/tools/asl_opt.py
index a4b8e12..7aadb3c 100644
--- a/asl_xdsl/tools/asl_opt.py
+++ b/asl_xdsl/tools/asl_opt.py
@@ -1,9 +1,12 @@
 from xdsl.xdsl_opt_main import xDSLOptMain
 
+from asl_xdsl.dialects.asl import ASLDialect
+
 
 class ASLOptMain(xDSLOptMain):
     def register_all_dialects(self):
-        return super().register_all_dialects()
+        super().register_all_dialects()
+        self.ctx.load_dialect(ASLDialect)
 
     def register_all_passes(self):
         return super().register_all_passes()
diff --git a/tests/filecheck/dialects/asl/types_attrs.mlir b/tests/filecheck/dialects/asl/types_attrs.mlir
new file mode 100644
index 0000000..f97200f
--- /dev/null
+++ b/tests/filecheck/dialects/asl/types_attrs.mlir
@@ -0,0 +1,19 @@
+// RUN: asl-opt %s | asl-opt %s | filecheck %s
+
+builtin.module {
+    "test.op"() {bool_type = !asl.bool} : () -> ()
+    "test.op"() {bool_true = #asl.bool_attr<true>, bool_false = #asl.bool_attr<false>} : () -> ()
+    
+    "test.op"() {int_type = !asl.int} : () -> ()
+    "test.op"() {int_attr = #asl.int_attr<42>} : () -> ()
+
+    "test.op"() {bits_type = !asl.bits<32>} : () -> ()
+    "test.op"() {bits_attr = #asl.bits_attr<42 : 32>} : () -> ()
+}
+
+// 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"() {"int_type" = !asl.int} : () -> ()
+// CHECK-NEXT:    "test.op"() {"int_attr" = #asl.int_attr<42>} : () -> ()
+// CHECK-NEXT:    "test.op"() {"bits_type" = !asl.bits<32>} : () -> ()
+// CHECK-NEXT:    "test.op"() {"bits_attr" = #asl.bits_attr<42 : 32>} : () -> ()