1 files changed, 32 insertions, 0 deletions
diff --git a/mysys/my_bit.c b/mysys/my_bit.c
new file mode 100644
index 00000000000..19ffb74a5c5
--- /dev/null
+++ b/mysys/my_bit.c
@@ -0,0 +1,32 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA */
+
+/* Some useful bit functions */
+
+#include "mysys_priv.h"
+
+/*
+  Find smallest X in 2^X >= value
+  This can be used to divide a number with value by doing a shift instead
+*/
+
+uint my_bit_log2(ulong value)
+{
+  uint bit;
+  for (bit=0 ; value > 1 ; value>>=1, bit++) ;
+  return bit;
+}