From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 6 Jul 2020 18:44:58 +0000 (+0100)
Subject: SelectableInt: make __mul__ return enough space to fit the result
X-Git-Tag: div_pipeline~162^2~30
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=30d70888160a45ec0562b3610d35d06145447102;p=soc.git

SelectableInt: make __mul__ return enough space to fit the result
---

diff --git a/src/soc/decoder/selectable_int.py b/src/soc/decoder/selectable_int.py
index 0c5e560c..3036b6f6 100644
--- a/src/soc/decoder/selectable_int.py
+++ b/src/soc/decoder/selectable_int.py
@@ -178,7 +178,12 @@ class SelectableInt:
     def __sub__(self, b):
         return self._op(sub, b)
     def __mul__(self, b):
-        return self._op(mul, b)
+        # different case: mul result needs to fit the total bitsize 
+        if isinstance(b, int):
+            b = SelectableInt(b, self.bits)
+        print ("SelectableInt mul", hex(self.value), hex(b.value),
+                                    self.bits, b.bits)
+        return SelectableInt(self.value * b.value, self.bits + b.bits)
     def __floordiv__(self, b):
         return self._op(floordiv, b)
     def __truediv__(self, b):