From: lkcl <lkcl@web>
Date: Sat, 11 Jun 2022 22:31:38 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~1842
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b9a5c5051500cca831b98e76806800d09f5785af;p=libreriscv.git

---

diff --git a/openpower/sv/mv.swizzle.mdwn b/openpower/sv/mv.swizzle.mdwn
index 8c0b84cad..6793f9440 100644
--- a/openpower/sv/mv.swizzle.mdwn
+++ b/openpower/sv/mv.swizzle.mdwn
@@ -10,7 +10,9 @@ Links
 Swizzle is usually done on a per-operand basis in 3D GPU ISAs, making
 for extremely long instructions (64 bits or greater).
 Their value lies in the high occurrence of Swizzle
-in 3D Shader Binaries (over 10% of all instructions).
+in 3D Shader Binaries (over 10% of all instructions),
+however it is not practical to add two or more sets of 12-bit
+prefixes into a single instruction.
 A compromise is to provide a Swizzle "Move".
 The encoding for this instruction embeds static predication into the
 swizzle as well as constants 1/1.0 and 0/0.0