From 864609b6e1bf263672a8ea3bde0996c9d1fbe60a Mon Sep 17 00:00:00 2001 From: lkcl Date: Wed, 14 Sep 2022 21:23:19 +0100 Subject: [PATCH] --- openpower/sv/rfc/ls001.mdwn | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) 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*. -- 2.30.2