cheat in trunch_rem, truncate result of multiply

diff --git a/src/nmutil/divmod.py b/src/nmutil/divmod.py
index 0f1a5491aeaabb83eacb49e251c5ecedd6c4e94b..488e225ed7627fd9f44806a8de002b499448715b 100644 (file)
--- a/src/nmutil/divmod.py
+++ b/src/nmutil/divmod.py
@@ -15,6 +15,8 @@ def trunc_div(n, d):
 # this is a POWER ISA 3.0B compatible mod / remainder function
 # however it is also the c, c++, rust, java *and* x86 way of doing things
 def trunc_rem(n, d):
-    return n - d * trunc_div(n, d)
+    m = d * trunc_div(n, d)
+    m.bits = n.bits # cheat - really shouldn't do this. mul returns full length
+    return n - m