Added IsPowerOfTwo and RoundUp functions.

zhenliang · May 26, 2011 · a44dfba · a44dfba
1 parent daf071f
commit a44dfba
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Showing 3 changed files with 19 additions and 1 deletion.
diff --git a/util/math_base.h b/util/math_base.h
@@ -1,11 +1,17 @@
 #pragma once
 
 #include "util.h"
+#include <assert.h>
 
 namespace util
 {
   #define UTIL_POW2(x) ((x)*(x))
 
+  inline bool IsPowerOfTwo(int n);
+
+  // align ±ØÐëÊÇ 2 µÄÃÝ
+  inline unsigned int RoundUp(unsigned int n, unsigned int align);
+
   template <class T1, class T2, class T3>
   inline T1 Clam(const T1& num, const T2& low, const T3& high);
   template <class T1, class T2>

diff --git a/util/math_base.inl b/util/math_base.inl
@@ -1,4 +1,16 @@
 
+inline bool IsPowerOfTwo(int n)
+{
+  return (n > 0) ? (!(n & (n - 1))) : false;
+}
+
+// align ±ØÐëÊÇ 2 µÄÃÝ
+inline unsigned int RoundUp(unsigned int n, unsigned int align) 
+{
+  assert(IsPowerOfTwo(align));
+  return (n + (align - 1)) & ~(align - 1);
+}
+
 template <class T1, class T2, class T3>
 inline T1 Clam(const T1& num, const T2& low, const T3& high)
 {

diff --git a/util/util.vcproj b/util/util.vcproj
@@ -310,7 +310,7 @@
 			</File>
 		</Filter>
 		<Filter
-			Name="test"
+			Name="dbgs"
 			>
 			<File
 				RelativePath=".\dbg_new.h"