From 5bf119b1a7f566a0d90199eae144b2b8182ed653 Mon Sep 17 00:00:00 2001
From: lkcl <lkcl@web>
Date: Wed, 27 Oct 2021 22:43:37 +0100
Subject: [PATCH]

---
 3d_gpu/architecture/dynamic_simd/shape.mdwn | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/3d_gpu/architecture/dynamic_simd/shape.mdwn b/3d_gpu/architecture/dynamic_simd/shape.mdwn
index 9786ad0bd..c2c0ea138 100644
--- a/3d_gpu/architecture/dynamic_simd/shape.mdwn
+++ b/3d_gpu/architecture/dynamic_simd/shape.mdwn
@@ -307,3 +307,16 @@ on SimdShape input parameters.
         def get_cases(self):
         @property
         def blanklanes(self):
+
+# SimdShape arithmetic operators
+
+Rudimentary arithmetic operations are required in order to perform
+tricks such as:
+
+       m = Module()
+       with SimdScope(m, elwid, vec_el_counts) as s:
+           shape = SimdShape(s, fixed_width=width)
+           a = s.Signal(shape)
+           b = s.Signal(shape*2)
+           o = s.Signal(shape*3)
+       m.c.comb + o.eq(Cat(a, b))
-- 
2.30.2