power_enums: better repr for Function enum

diff --git a/src/openpower/decoder/power_enums.py b/src/openpower/decoder/power_enums.py
index 0cd4aab04278de3b41fc92f6d3742b0c12789eb3..e414178c379ded09c7b9b92984612d9682a0056e 100644 (file)
--- a/src/openpower/decoder/power_enums.py
+++ b/src/openpower/decoder/power_enums.py
@@ -22,6 +22,7 @@ import csv
 import os
 from os.path import dirname, join
 from collections import namedtuple
+import functools
 
 
 def find_wiki_dir():
@@ -109,6 +110,20 @@ class Function(Enum):
     VL = 1 << 13  # setvl
     FPU = 1 << 14  # FPU
 
+    @functools.lru_cache(maxsize=None)
+    def __repr__(self):
+        counter = 0
+        value = int(self.value)
+        if value != 0:
+            while value != 0:
+                counter += 1
+                value >>= 1
+            counter -= 1
+            desc = f"(1 << {counter})"
+        else:
+            desc = "0"
+        return f"<{self.__class__.__name__}.{self.name}: {desc}>"
+
 
 @unique
 class Form(Enum):