From d07e23eb006dbbb83f9c33942a313b7bad3a90f7 Mon Sep 17 00:00:00 2001
From: Koichi Nakamura <koichi@idein.jp>
Date: Wed, 5 May 2021 23:09:26 +0900
Subject: [PATCH] Add comments to bitscan-forward

---
 lib/bitscan.fs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/bitscan.fs b/lib/bitscan.fs
index 5261d5f..5c2f6bc 100644
--- a/lib/bitscan.fs
+++ b/lib/bitscan.fs
@@ -32,7 +32,9 @@ create bsf-modulo-131-table
 \ Find the index of the least significant 1 bit
 \ If u == 0, returns -1
 : bitscan-forward ( u -- u )
-    dup negate and 131 mod cells bsf-modulo-131-table + @
+    dup negate and \ LS1B isolation
+    131 mod \ perfect hashing
+    cells bsf-modulo-131-table + @
 ; export
 
 create msb-index-table