From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 5 Aug 2020 18:46:51 +0000 (+0100)
Subject: MULS on parameter b needed to check whether it was sign-extended
X-Git-Tag: semi_working_ecp5~429^2~1
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c9d96f162b1bc4a48e95cd6a8ed25b82c11a95a4;p=soc.git

MULS on parameter b needed to check whether it was sign-extended
---

diff --git a/src/soc/decoder/helpers.py b/src/soc/decoder/helpers.py
index 17534800..a50d0092 100644
--- a/src/soc/decoder/helpers.py
+++ b/src/soc/decoder/helpers.py
@@ -4,6 +4,7 @@ from nmutil.divmod import trunc_divs, trunc_rems
 from operator import floordiv, mod
 from soc.decoder.selectable_int import selectltu as ltu
 from soc.decoder.selectable_int import selectgtu as gtu
+from soc.decoder.selectable_int import check_extsign
 
 trunc_div = floordiv
 trunc_rem = mod
@@ -37,6 +38,9 @@ def EXTS64(value):
 
 # signed version of MUL
 def MULS(a, b):
+    if isinstance(b, int):
+        b = SelectableInt(b, self.bits)
+    b = check_extsign(a, b)
     a_s = a.value & (1 << (a.bits-1)) != 0
     b_s = b.value & (1 << (b.bits-1)) != 0
     result = abs(a) * abs(b)