diff --git a/osaca/parser/immediate.py b/osaca/parser/immediate.py
index 742819c..10e77af 100644
--- a/osaca/parser/immediate.py
+++ b/osaca/parser/immediate.py
@@ -4,6 +4,8 @@
 
 
 class ImmediateOperand(Operand):
+    WILDCARD = "*"
+    
     def __init__(
         self,
         identifier=None,
@@ -69,3 +71,10 @@ def __eq__(self, other):
                 and self._shift == other._shift
             )
         return False
+    
+    def is_immediate_type(self, other, isa):
+        if isa == "aarch64":
+            if isinstance(other, ImmediateOperand):
+                return (self.imd_type == self.WILDCARD or self.imd_type == other.imd_type) and other.value is not None
+        elif isa == "x86":
+            return isinstance(other, ImmediateOperand) and other.imd_type == "int"
diff --git a/osaca/semantics/hw_model.py b/osaca/semantics/hw_model.py
index b0c0713..c4fb521 100644
--- a/osaca/semantics/hw_model.py
+++ b/osaca/semantics/hw_model.py
@@ -74,8 +74,8 @@ def __init__(self, arch=None, path_to_yaml=None, isa=None, lazy=False):
             if self._path in MachineModel._runtime_cache and not lazy:
                 self._data = MachineModel._runtime_cache[self._path]
             # check if file is cached
-            #cached = self._get_cached(self._path) if not lazy else False
-            if False:
+            cached = self._get_cached(self._path) if not lazy else False
+            if cached:
                 self._data = cached
             else:
                 yaml = self._create_yaml_object()
@@ -771,30 +771,8 @@ def _check_AArch64_operands(self, i_operand, operand):
                 return False
             return operand.is_mem_type(i_operand, self._data["isa"].lower())
         # immediate
-        if isinstance(i_operand, ImmediateOperand) and i_operand.imd_type == self.WILDCARD:
-            return isinstance(operand, ImmediateOperand) and (operand.value is not None)
-
-        if isinstance(i_operand, ImmediateOperand) and i_operand.imd_type == "int":
-            return (
-                isinstance(operand, ImmediateOperand)
-                and operand.imd_type == "int"
-                and operand.value is not None
-            )
-
-        if isinstance(i_operand, ImmediateOperand) and i_operand.imd_type == "float":
-            return (
-                isinstance(operand, ImmediateOperand)
-                and operand.imd_type == "float"
-                and operand.value is not None
-            )
-
-        if isinstance(i_operand, ImmediateOperand) and i_operand.imd_type == "double":
-            return (
-                isinstance(operand, ImmediateOperand)
-                and operand.imd_type == "double"
-                and operand.value is not None
-            )
-
+        if isinstance(i_operand, ImmediateOperand):
+            return i_operand.is_immediate_type(operand, self._data["isa"].lower())
         # identifier
         if isinstance(operand, IdentifierOperand) or (
             isinstance(operand, ImmediateOperand) and operand.identifier is not None
@@ -812,9 +790,6 @@ def _check_AArch64_operands(self, i_operand, operand):
 
     def _check_x86_operands(self, i_operand, operand):
         """Check if the types of operand ``i_operand`` and ``operand`` match."""
-        # if "class" in operand.name:
-        # compare two DB entries
-        #    return self._compare_db_entries(i_operand, operand)
         # register
         if isinstance(operand, RegisterOperand):
             if not isinstance(i_operand, RegisterOperand):
@@ -827,7 +802,7 @@ def _check_x86_operands(self, i_operand, operand):
             return operand.is_mem_type(i_operand, self._data["isa"].lower())
         # immediate
         if isinstance(operand, ImmediateOperand):
-            return isinstance(i_operand, ImmediateOperand) and i_operand.imd_type == "int"
+            return operand.is_immediate_type(i_operand, self._data["isa"].lower())
         # identifier (e.g., labels)
         if isinstance(operand, IdentifierOperand):
             return isinstance(i_operand, IdentifierOperand)