From 51678e6ca5f4c92cd56ce17a92bb949df3711035 Mon Sep 17 00:00:00 2001
From: lkcl <lkcl@web>
Date: Mon, 25 Jan 2021 15:24:18 +0000
Subject: [PATCH]

---
 openpower/sv/bitmanip.mdwn | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/openpower/sv/bitmanip.mdwn b/openpower/sv/bitmanip.mdwn
index 156fb2b53..16e7cda94 100644
--- a/openpower/sv/bitmanip.mdwn
+++ b/openpower/sv/bitmanip.mdwn
@@ -428,6 +428,21 @@ uint_xlen_t clmulr(uint_xlen_t RA, uint_xlen_t RB)
 ```
 # Galois Field Multiply
 
+this requires 3 parameters and a "degree"
+
+    RT = GFMUL(RA, RB, gfdegree, modulo=RC)
+
+realistically with the degree also needing to be an immediate it should be brought down to an overwrite version:
+
+    RS = GFMUL(RS, RA, gfdegree, modulo=RB)
+
+| 0.5|6.10|11.15|16.20|21.25| 26..30  |31|
+| -- | -- | --- | --- | --- | ------- |--|
+| NN | RS | RA  | RB  | deg |         |  |
+
+where the SimpleV variant may override RS-as-src differently from RS-as-dest
+
+
 ```
 from functools import reduce
 
-- 
2.30.2