From 5f6a89562d5faeec3cf5e141373917284c34102d Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Tue, 20 Mar 2007 00:16:52 +0000
Subject: [PATCH] Make isOneBitSet faster by using APInt::isPowerOf2. Thanks
 Chris.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35194 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/InstructionCombining.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index c87a351e63b..287a0077ec6 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -3472,7 +3472,7 @@ static bool isMinValuePlusOne(const ConstantInt *C, bool isSigned) {
 // isOneBitSet - Return true if there is exactly one bit set in the specified
 // constant.
 static bool isOneBitSet(const ConstantInt *CI) {
-  return CI->getValue().countPopulation() == 1;
+  return CI->getValue().isPowerOf2();
 }
 
 #if 0   // Currently unused