From: Marek Olšák <maraeo@gmail.com>
Date: Thu, 29 Mar 2012 22:21:11 +0000 (+0200)
Subject: gallium/util: add util_bit_last - finds the last bit set in a word
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6694a68d890a9aa491b5c3e8a576318bb6124e21;p=mesa.git

gallium/util: add util_bit_last - finds the last bit set in a word
---

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index f35c35ffe47..90b421ed841 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -477,6 +477,20 @@ unsigned ffs( unsigned u )
 
 #endif /* FFS_DEFINED */
 
+/**
+ * Find last bit set in a word.  The least significant bit is 1.
+ * Return 0 if no bits are set.
+ */
+static INLINE unsigned util_last_bit(unsigned u)
+{
+   unsigned r = 0;
+   while (u) {
+       r++;
+       u >>= 1;
+   }
+   return r;
+}
+
 
 /* Destructively loop over all of the bits in a mask as in:
  *