From bb4c024eced053b0fe3914a62406535478a5f480 Mon Sep 17 00:00:00 2001
From: lkcl <lkcl@web>
Date: Fri, 27 May 2022 11:16:12 +0100
Subject: [PATCH]

---
 openpower/sv/svp64_quirks.mdwn | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/openpower/sv/svp64_quirks.mdwn b/openpower/sv/svp64_quirks.mdwn
index ad3662fe6..72458c425 100644
--- a/openpower/sv/svp64_quirks.mdwn
+++ b/openpower/sv/svp64_quirks.mdwn
@@ -78,4 +78,15 @@ this section.
 
 # Branch-Conditional
 
-[[sv/branches]]
+[[sv/branches]] are a very special exception to the rule that the
+Scalar instruction shall not be modified.  This because of the tight
+integration with looping and the application of Boolean Logic
+manipulation needed for Parallel operations (predicate mask usage).
+
+One key difference is that LR is only updated if certain additional
+conditions are met, whereas Scalar `bclrl` for example unconditionally
+overwrites LR.
+
+Well over 500 Vectorised branch instructions exist in SVP64 due to the
+number of options available: close integration and interaction with
+the base Scalar Branch was unavoidable.
-- 
2.30.2