From 02aabb826e19c328d615f82cb03803c61c82eeed Mon Sep 17 00:00:00 2001
From: lkcl <lkcl@web>
Date: Sun, 13 Mar 2022 15:29:03 +0000
Subject: [PATCH]

---
 openpower/sv/bitmanip.mdwn | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/openpower/sv/bitmanip.mdwn b/openpower/sv/bitmanip.mdwn
index c46d1ce95..d35c856ee 100644
--- a/openpower/sv/bitmanip.mdwn
+++ b/openpower/sv/bitmanip.mdwn
@@ -329,7 +329,9 @@ uint_xlen_t bmextrev(RA, RB, sh)
 # grevlut
 
 generalised reverse combined with a pair of LUT2s and allowing
-zero when RA=0 provides a wide range of instructions
+a constant `0b0101...0101` when RA=0, and an option to invert
+(including when RA=0, giving a constant 0b1010...1010 as the
+initial value) provides a wide range of instructions
 and a means to set regular 64 bit patterns in one
 32 bit instruction.
 
-- 
2.30.2