From: lkcl <lkcl@web>
Date: Sat, 19 Mar 2022 06:49:11 +0000 (+0000)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~3007
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=633d57457d98b8c6ab7803fe72050f8918bba87f;p=libreriscv.git

---

diff --git a/openpower/sv/bitmanip/gfpinv.py b/openpower/sv/bitmanip/gfpinv.py
index e75773abd..45b6dbbdd 100644
--- a/openpower/sv/bitmanip/gfpinv.py
+++ b/openpower/sv/bitmanip/gfpinv.py
@@ -16,12 +16,16 @@ def gfpinv(a):
     r = 0
     s = 1
     while v > 0:
+        # implementations could use count-zeros on
+        # both u and r to save cycles
         if u & 1 == 0:
             u >>= 1
             if r & 1 == 0:
                 r >>= 1
             else:
                 r = (r + p) >> 1
+        # implementations could use count-zeros on
+        # both v and s to save cycles
         elif v & 1 == 0:
             v >>= 1
             if s & 1 == 0: