From 44e33e674ad560b6e6d063a930e7af6d846fb0eb Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Mon, 19 Mar 2007 21:04:43 +0000
Subject: [PATCH] Implement isOneBitSet in terms of APInt::countPopulation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35186 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/InstructionCombining.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index e38622a569f..dbe694fad78 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -3474,8 +3474,7 @@ 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) {
-  uint64_t V = CI->getZExtValue();
-  return V && (V & (V-1)) == 0;
+  return CI->getValue().countPopulation() == 1;
 }
 
 #if 0   // Currently unused