From: lkcl <lkcl@web>
Date: Sat, 9 Apr 2022 20:53:52 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~2817
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a48853a8702f5f2cf2f77dee07cd0852db47a006;p=libreriscv.git

---

diff --git a/openpower/sv/svp64/appendix.mdwn b/openpower/sv/svp64/appendix.mdwn
index 59c430468..be12ba2c5 100644
--- a/openpower/sv/svp64/appendix.mdwn
+++ b/openpower/sv/svp64/appendix.mdwn
@@ -147,7 +147,8 @@ Predication was suitable.  As a general rule this was if there
 was only a single operand and a single result (`extw` and LD/ST)
 however it was found that some 2 or 3 operand instructions also
 qualify. Given that 3 of the 9 bits of EXTRA had to be sacrificed for use
-in Twin Predication, some compromises were made, here.
+in Twin Predication, some compromises were made, here.  LDST is
+Twin but also has 3 operands in some operations, so only EXTRA2 can be used.
 
 Fourthly, a packing format was decided: for 2R-1W an EXTRA3 indexing
 could have been decided