From fbaa8f80015cc6b2b1ada9a5dc0970d496b16dbd Mon Sep 17 00:00:00 2001
From: lkcl <lkcl@web>
Date: Wed, 30 Dec 2020 18:44:33 +0000
Subject: [PATCH]

---
 openpower/sv/overview.mdwn | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/openpower/sv/overview.mdwn b/openpower/sv/overview.mdwn
index c89d0995b..baa58fdd7 100644
--- a/openpower/sv/overview.mdwn
+++ b/openpower/sv/overview.mdwn
@@ -408,6 +408,9 @@ is applied to the whole subvector:
         if (RA.isvec)  { irs1 += 1; }
         if (RB.isvec)  { irs2 += 1; }
 
+The primary reason for this is because Shader Compilers treat vec2/3/4 as
+"single units".  Recognising this in hardware is just sensible.
+
 # Swizzle <a name="swizzle"></a>
 
 Swizzle is particularly important for 3D work.  It allows in-place
-- 
2.30.2