Module: Mesa
Branch: master
Commit: 6b129a82223c674d3e11472aa8abe07fd741764a
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=6b129a82223c674d3e11472aa8abe07fd741764a
Author: José Fonseca <jfons...@vmware.com>
Date: Mon Sep 7 14:21:51 2009 +0100
util: Utility function to check if a number is a power of two.
---
src/gallium/auxiliary/util/u_math.h | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/src/gallium/auxiliary/util/u_math.h
b/src/gallium/auxiliary/util/u_math.h
index 4c6c2bc..b12c97d 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -341,6 +341,16 @@ 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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