From: lkcl <lkcl@web>
Date: Sat, 10 Sep 2022 09:13:03 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~535
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0e4ed77fb0ac8f19a69bd955d4c2a751f1cbe65a;p=libreriscv.git

---

diff --git a/openpower/sv/rfc/ls001.mdwn b/openpower/sv/rfc/ls001.mdwn
index cb2279c4b..25d4433a4 100644
--- a/openpower/sv/rfc/ls001.mdwn
+++ b/openpower/sv/rfc/ls001.mdwn
@@ -329,17 +329,16 @@ the above scheme originated. Section 1.6.3 uses the term "defined word"
 to refer to pre-existing EXT000-EXT063 32-bit instructions so prefixed
 to create the new numbering EXT100-EXT163, respectively*)
 
-The opportunity to create two new 32-bit encoding spaces each with
-64 Major opcodes each is best made with another table:
+For Libre-SOC's needs, one of the `RESERVED` spaces *needs* to be allocated to new POs, the other does not:
 
 |          | Scalar (bit7=0,8-31=0000) | Scalar (bit7=0,8-31=!zero)| Vector (bit7=1)  |
 |----------|---------------------------|---------------------------|------------------|
 |new bit6=0| `RESERVED1`:{EXT200-063}  | SVP64-Single:{EXT200-263} | SVP64:{EXT200-263} |
 |old bit6=1| `RESERVED2`:{EXT300-363}  | SVP64-Single:{EXT000-063}   | SVP64:{EXT000-063}   |
 
-* **`RESERVED2`:{EXT300-363}** is not and **cannot** ever be Vectorised or
+* **`RESERVED2`:{EXT300-363}** (not strictly necessary to be added) is not and **cannot** ever be Vectorised or
   Augmented by Simple-V or any future Simple-V Scheme.
-  it is a pure **Scalar-only** new set of 64 Major Opcodes
+  it is a pure **Scalar-only** PO Group. It may remain `RESERVED`.
 * **`RESERVED1`:{EXT200-263}** is also a Scalar-only new set of 64 Major
   Opcodes.
   These opcodes do not *need* to be Simple-V-Augmented