From d82196e5b61827456d69e94319f57f406b24878f Mon Sep 17 00:00:00 2001
From: lkcl <lkcl@web>
Date: Fri, 25 Dec 2020 22:25:41 +0000
Subject: [PATCH]

---
 openpower/sv/bitmanip.mdwn | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/openpower/sv/bitmanip.mdwn b/openpower/sv/bitmanip.mdwn
index 4b75b5d05..947c856a2 100644
--- a/openpower/sv/bitmanip.mdwn
+++ b/openpower/sv/bitmanip.mdwn
@@ -111,3 +111,20 @@ based on RV bitmanip
 uint_xlen_t cmix(uint_xlen_t rs1, uint_xlen_t rs2, uint_xlen_t rs3) { return (rs1 & rs2) | (rs3 & ~rs2);
 }
 ```
+
+# carryless mul
+
+```
+uint_xlen_t clmul(uint_xlen_t rs1, uint_xlen_t rs2) { uint_xlen_t x = 0;
+}
+for (int i = 0; i < XLEN; i++) if ((rs2 >> i) & 1)
+x ^= rs1 << i; return x;
+uint_xlen_t clmulh(uint_xlen_t rs1, uint_xlen_t rs2) { uint_xlen_t x = 0;
+}
+for (int i = 1; i < XLEN; i++) if ((rs2 >> i) & 1)
+x ^= rs1 >> (XLEN-i); return x;
+uint_xlen_t clmulr(uint_xlen_t rs1, uint_xlen_t rs2) { uint_xlen_t x = 0;
+}
+for (int i = 0; i < XLEN; i++) if ((rs2 >> i) & 1)
+x ^= rs1 >> (XLEN-i-1); return x;
+```
-- 
2.30.2