From 371b8bfad508e7f158d273e1fd1570f8ee3042a5 Mon Sep 17 00:00:00 2001
From: lkcl <lkcl@web>
Date: Sun, 2 Oct 2022 16:37:41 +0100
Subject: [PATCH]

---
 openpower/sv/biginteger.mdwn | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/openpower/sv/biginteger.mdwn b/openpower/sv/biginteger.mdwn
index 6a7392e9c..83122ee50 100644
--- a/openpower/sv/biginteger.mdwn
+++ b/openpower/sv/biginteger.mdwn
@@ -59,7 +59,9 @@ is Z23-Form in "overwrite" on RT.
 
 Both instructions take two 64-bit sources, concatenate
 them together then extract 64 bits from it, the offset
-location determined by a third source.
+location determined by a third source.  So as to avoid
+costly 4-reg (VA-Form) a 2-bit mode `sm` gives four
+potential overwrite and zero-source options instead.
 
 # maddedu
 
-- 
2.30.2