From: lkcl <lkcl@web>
Date: Sat, 9 Oct 2021 10:54:10 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~3688
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=09d75dcb5b29496508cb10060fb17c590ae8c668;p=libreriscv.git

---

diff --git a/3d_gpu/architecture/dynamic_simd/shape.mdwn b/3d_gpu/architecture/dynamic_simd/shape.mdwn
index d59451a0b..d9cddb183 100644
--- a/3d_gpu/architecture/dynamic_simd/shape.mdwn
+++ b/3d_gpu/architecture/dynamic_simd/shape.mdwn
@@ -5,3 +5,13 @@ provides sufficient context to both define overrides for individual lengths
 on a per-mask basis as well as sufficient information to "upcast"
 back to a SimdSignal, in exactly the same way that c++ virtual base
 class upcasting works when RTTI (Run Time Type Information) works.
+
+By deriving from `ast.Shape` both `width` and `signed` are provided
+already leaving the `SimdShape` class with the responsibility to
+additionally define lengths for each mask basis. This is best illustrated
+with an example.
+
+The Libre-SOC IEEE754 ALUs need to be converted to SIMD Partitioning
+but without massive disruptive code-duplication or intrusive explicit
+coding as outlined in the worst of the techniques documented in
+[[dynamic_simd]]