From: lkcl <lkcl@web>
Date: Mon, 16 May 2022 07:53:30 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~2205
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fa44abdbe03cd8f1ae033b0469f3983ba564fe49;p=libreriscv.git

---

diff --git a/openpower/sv/bitmanip.mdwn b/openpower/sv/bitmanip.mdwn
index ee625e23e..10098a7b8 100644
--- a/openpower/sv/bitmanip.mdwn
+++ b/openpower/sv/bitmanip.mdwn
@@ -670,7 +670,23 @@ uint64_t bmator(uint64_t RA, uint64_t RB)
     }
     return x;
 }
-
+uint64_t bmatand(uint64_t RA, uint64_t RB)
+{
+    // transpose of RB
+    uint64_t RBt = bmatflip(RB);
+    uint8_t u[8]; // rows of RA
+    uint8_t v[8]; // cols of RB
+    for (int i = 0; i < 8; i++) {
+        u[i] = RA >> (i*8);
+        v[i] = RBt >> (i*8);
+    }
+    uint64_t x = 0;
+    for (int i = 0; i < 64; i++) {
+        if ((u[i / 8] & v[i % 8]) == 0xff)
+            x |= 1LL << i;
+    }
+    return x;
+}
 ```
 
 # Introduction to Carry-less and GF arithmetic