From: Konstantinos Margaritis <konstantinos.margaritis@vectorcamp.gr>
Date: Fri, 28 Apr 2023 11:48:48 +0000 (+0000)
Subject: use proper register sizes
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=eb07b387f39a2e7b35172006ed09b7c52c6c9f56;p=openpower-isa.git

use proper register sizes
---

diff --git a/openpower/isa/butterfly.mdwn b/openpower/isa/butterfly.mdwn
index 0d799a68..b6fecae2 100644
--- a/openpower/isa/butterfly.mdwn
+++ b/openpower/isa/butterfly.mdwn
@@ -13,12 +13,12 @@ Pseudo-code:
     n <- XLEN-SH
     sum <- (RT) + (RA)
     diff <- (RT) - (RA)
-    prod1 <- MULS(RB, sum)
-    prod2 <- MULS(RB, diff)
+    prod1[0:(XLEN*2)-1] <- MULS(RB, sum)
+    prod2[0:(XLEN*2)-1] <- MULS(RB, diff)
     res1 <- prod1[XLEN/2-SH:XLEN-1-SH]
     res2 <- prod2[XLEN/2-SH:XLEN-1-SH]
-    RT <- (RT) + res1
-    RS <- (RS) + res2
+    RT <- (RT) + EXTS(res1)
+    RS <- (RS) + EXTS(res2)
 
 Special Registers Altered: