From: lkcl <lkcl@web>
Date: Sat, 23 Oct 2021 18:57:59 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~3546
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d51fc2dc33c3f2b521e7fe6efde1154597aec76b;p=libreriscv.git

---

diff --git a/3d_gpu/architecture/dynamic_simd/slice.mdwn b/3d_gpu/architecture/dynamic_simd/slice.mdwn
index c185e6404..2fac03f39 100644
--- a/3d_gpu/architecture/dynamic_simd/slice.mdwn
+++ b/3d_gpu/architecture/dynamic_simd/slice.mdwn
@@ -202,9 +202,17 @@ obviously so) and consequently b needs expanding
 to the same padding and PartitionPoints:
   
     elwid |      | |      | |      | |
-    0b00 x x x x  x x x x  x x x x  x x B1B0
-    0b01 x x x x  x x B5B4 x x x x  x x B1B0
-    0b10 x x B7B6 x x B5B4 x x B3B2 x x B1B0
+    0b00 x x x x  x x x x  x x x x  x 0 B1B0
+    0b01 x x x x  x 0 B5B4 x 0 x x  x 0 B1B0
+    0b10 x 0 B7B6 x 0 B5B4 x 0 B3B2 x 0 B1B0
+
+Note here that zero-extension also had to occur to
+bring b up to the same element width in each partition,
+at which point, "x" padding being ignored, a straight
+PartitionedAdd may be deployed because both the overall
+width and the positions of the PartitionPoints are exactly
+matched.
+
 
 Illustrating the case where a Sliced (fixed element width) SimdSignal
 is added to one which has variable-length elements that take up the