From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 11 Jul 2022 12:21:44 +0000 (+0100)
Subject: fix issue in SelectableInt.__rsub__ causing truncation of values
X-Git-Tag: sv_maxu_works-initial~256
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0a33a59175def52235699db582e223408c8b62d4;p=openpower-isa.git

fix issue in SelectableInt.__rsub__ causing truncation of values
---

diff --git a/src/openpower/decoder/selectable_int.py b/src/openpower/decoder/selectable_int.py
index a3eca3d4..675243a2 100644
--- a/src/openpower/decoder/selectable_int.py
+++ b/src/openpower/decoder/selectable_int.py
@@ -253,11 +253,12 @@ class SelectableInt:
         return self
 
     def __rsub__(self, b):
+        log("rsub", b, self.value)
         if isinstance(b, int):
-            b = SelectableInt(b, self.bits)
-        b = check_extsign(self, b)
-        assert b.bits == self.bits
-        return SelectableInt(b.value - self.value, self.bits)
+            b = SelectableInt(b, 256) # max extent
+        #b = check_extsign(self, b)
+        #assert b.bits == self.bits
+        return SelectableInt(b.value - self.value, b.bits)
 
     def __radd__(self, b):
         if isinstance(b, int):