From: lkcl <lkcl@web>
Date: Wed, 14 Sep 2022 20:23:19 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~440
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=864609b6e1bf263672a8ea3bde0996c9d1fbe60a;p=libreriscv.git

---

diff --git a/openpower/sv/rfc/ls001.mdwn b/openpower/sv/rfc/ls001.mdwn
index 230a22605..01724ee18 100644
--- a/openpower/sv/rfc/ls001.mdwn
+++ b/openpower/sv/rfc/ls001.mdwn
@@ -120,7 +120,9 @@ Thus "Silicon-Partner" Scalability
 is prohibited in the Simple-V Scalable Vector ISA,
 This does
 mean that `RESERVED` space is crucial to have, in order
-to safely provide future expanded register file bitwidths and sizes[^msr]
+to safely provide the option of
+future expanded register file bitwidths and sizes[^msr],
+under explicitly-distinguishable encoding,
 **at the discretion of and with the full authority of the OPF ISA WG**,
 not the implementor ("Silicon Partner").
 
@@ -379,7 +381,18 @@ into `sv.bc`: it became CISC-like and was reverted.
 
 [REMAP](https://libre-soc.org/openpower/sv/remap)
 is extremely advanced but brings features already present in other
-DSPs and Supercomputing ISAs.
+DSPs and Supercomputing ISAs.  Normally (without these features)
+algorithms are are costly or
+convoluted to implement.  They are typically implemented
+as hard-coded fully loop-unrolled assembler which is often
+auto-generated by specialist dedicated tools, or written
+entirely by hand.
+
+All REMAP Schedules *including Indexed*
+are 100% Deterministic from their point of declaration,
+making it possible to forward-plan
+Issue, Memory access and Register Hazard Management
+in Multi-Issue Micro-architectures.
 
 * **DCT/FFT** REMAP brings more capability than TI's MSP-Series DSPs and
   Qualcom Hexagon DSPs, and is not restricted to Integer or FP.
@@ -393,7 +406,8 @@ DSPs and Supercomputing ISAs.
   suited to Convolutions, Matrix Transpose and rotate, *all* of which is
   in-place.
 * **General-purpose Indexed** REMAP, this option is provided to implement
-  an equivalent of VSX `vperm`
+  an equivalent of VSX `vperm`, as a general-purpose catch-all means of
+  covering algorithms outside of the other REMAP Engines.
 * **Parallel Reduction** REMAP, performs an automatic map-reduce using
   *any suitable scalar operation*.