From: lkcl <lkcl@web>
Date: Wed, 17 Aug 2022 07:37:20 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~845
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=874556f4e1787ec25bdbe1ea22aedc22041094b0;p=libreriscv.git

---

diff --git a/openpower/sv/shape_table_format.mdwn b/openpower/sv/shape_table_format.mdwn
index a4a2f31bf..894f96733 100644
--- a/openpower/sv/shape_table_format.mdwn
+++ b/openpower/sv/shape_table_format.mdwn
@@ -162,3 +162,8 @@ def index_remap(ISHAPE, i):
     return get_polymorphed_reg(svreg, srcwid, el_idx) + offs
 ```
 
+The most important observation above is that the Matrix-style
+remapping occurs first and the Index lookup second.  Thus it
+becomes possible to perform in-place Transpose of Indices which
+may have been costly to set up or costly to duplicate
+(waste register file space).