From: lkcl <lkcl@web>
Date: Sun, 2 Oct 2022 15:37:41 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~246
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=371b8bfad508e7f158d273e1fd1570f8ee3042a5;p=libreriscv.git

---

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