From: lkcl <lkcl@web>
Date: Sat, 5 Mar 2022 11:39:02 +0000 (+0000)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~3156
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e4957db5becf5bdf2303588d31a324dce3d68443;p=libreriscv.git

---

diff --git a/openpower/sv/bitmanip.mdwn b/openpower/sv/bitmanip.mdwn
index 5cb5d51f3..b39ed6696 100644
--- a/openpower/sv/bitmanip.mdwn
+++ b/openpower/sv/bitmanip.mdwn
@@ -508,10 +508,15 @@ uint64_t gorc64(uint64_t RA, uint64_t RB)
 
 ```
 
-# Galois Field
+# Galois Field 2^M
 
 see <https://courses.csail.mit.edu/6.857/2016/files/ffield.py>
 
+## SPRs to set modulo and degree
+
+to save registers and make operations orthogonal with standard
+arithmetic the modulo is to be set in an SPR
+
 ## Multiply
 
 this requires 3 parameters and a "degree"