From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Tue, 5 Jul 2022 13:20:11 +0000 (+0100)
Subject: MulOutputData was only 64-bit output not 128-bit
X-Git-Url: https://git.libre-soc.org/?p=soc.git;a=commitdiff_plain;h=1f2a29c06b122d2af83d3d81e3e2c492ceca0c4d

MulOutputData was only 64-bit output not 128-bit
meaning that mulhd is truncated (always zero)
https://bugs.libre-soc.org/show_bug.cgi?id=855
---

diff --git a/src/soc/fu/mul/pipe_data.py b/src/soc/fu/mul/pipe_data.py
index ded4c508..a5047be7 100644
--- a/src/soc/fu/mul/pipe_data.py
+++ b/src/soc/fu/mul/pipe_data.py
@@ -25,7 +25,7 @@ class MulOutputData(FUBaseData):
 
     @property
     def regspec(self):
-        return [('INT', 'o', "0:%d" % (self.pspec.XLEN)),
+        return [('INT', 'o', "0:%d" % (self.pspec.XLEN*2)), # 2xXLEN
                ('XER', 'xer_so', '32')] # XER bit 32: SO