From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sat, 11 Jul 2020 10:13:09 +0000 (+0100)
Subject: add overflow to mullw
X-Git-Tag: convert-csv-opcode-to-binary~2372
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=74f0cc0d08b9de219e60a085c0a6bb8b482c404f;p=libreriscv.git

add overflow to mullw
---

diff --git a/openpower/isa/fixedarith.mdwn b/openpower/isa/fixedarith.mdwn
index 65425d2ef..4447bd80f 100644
--- a/openpower/isa/fixedarith.mdwn
+++ b/openpower/isa/fixedarith.mdwn
@@ -350,6 +350,8 @@ Pseudo-code:
 
     prod[0:63] <- MULS((RA)[32:63], (RB)[32:63])
     RT <- prod
+    overflow <- (prod[32:64] != 0x0000_0000) &
+                (prod[32:64] != 0xffff_ffff)
 
 Special Registers Altered: