From 6b129a82223c674d3e11472aa8abe07fd741764a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Fonseca?= <jfonseca@vmware.com>
Date: Mon, 7 Sep 2009 14:21:51 +0100
Subject: util: Utility function to check if a number is a power of two.

---
 src/gallium/auxiliary/util/u_math.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/gallium/auxiliary/util')

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index 4c6c2bc00e..b12c97dfb4 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -340,6 +340,16 @@ util_is_inf_or_nan(float x)
 }
 
 
+/**
+ * Test whether x is a power of two.
+ */
+static INLINE boolean
+util_is_pot(unsigned x)
+{
+   return (x & (x - 1)) == 0;
+}
+
+
 /**
  * Find first bit set in word.  Least significant bit is 1.
  * Return 0 if no bits set.
-- 
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