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 17534800e600ba2ffb521b38c8ca3c4450aa534b..a50d009263a839271a136ceacc3995ff44d85b63 100644 (file)
--- 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)