From: lkcl <lkcl@web>
Date: Wed, 2 Oct 2019 07:31:32 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~3930
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=115f34a704e517ffc503355145f86e955438c7a6;p=libreriscv.git

---

diff --git a/simple_v_extension/specification/bitmanip.mdwn b/simple_v_extension/specification/bitmanip.mdwn
index 25acef469..d38b4246f 100644
--- a/simple_v_extension/specification/bitmanip.mdwn
+++ b/simple_v_extension/specification/bitmanip.mdwn
@@ -80,6 +80,15 @@ output  instruction     pseudoinstruction
 
 population-count
 
+Pseudocode:
+
+    unsigned int v; // count the number of bits set in v
+    unsigned int c; // c accumulates the total bits set in v
+    for (c = 0; v; c++)
+    {
+      v &= v - 1; // clear the least significant bit set
+    }
+
 ## ffirst - find first bit
 
 finds the first bit set as an index.