From e9c7c2b139e573924a9c59b23e294c900d0349b2 Mon Sep 17 00:00:00 2001
From: Andrew Munger <waxdragon@gmail.com>
Date: Fri, 5 May 2006 15:10:59 +0000
Subject: [PATCH] "More efficient" IsPowerOf2 from Myria (myriachan at cox dot
 net).

svn path=/trunk/; revision=21801
---
 reactos/ntoskrnl/mm/pe.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/reactos/ntoskrnl/mm/pe.c b/reactos/ntoskrnl/mm/pe.c
index c0f7df023f9..41502117a5c 100644
--- a/reactos/ntoskrnl/mm/pe.c
+++ b/reactos/ntoskrnl/mm/pe.c
@@ -103,12 +103,8 @@ static __inline BOOLEAN Intsafe_CanOffsetPointer(IN CONST VOID * Pointer, IN SIZ
 static __inline BOOLEAN IsPowerOf2(IN ULONG Number)
 {
     if(Number == 0)
-	return FALSE;
-
-    while((Number % 2) == 0)
-	Number /= 2;
-
-    return Number == 1;
+		return FALSE;
+    return (Number & (Number - 1)) == 0;
 }
 
 static __inline ULONG ModPow2(IN ULONG Address, IN ULONG Alignment)