From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Fri, 3 Mar 2017 16:56:33 +0000 (+0000)
Subject: Use APInt::getLowBitsSet instead of APInt::getBitsSet for lower bit mask creation
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=85969be932df26bc12ae40d891f76ba001f8a8eb;p=llvm

Use APInt::getLowBitsSet instead of APInt::getBitsSet for lower bit mask creation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296882 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
index e641acbfbd9..d8824b473a6 100644
--- a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
+++ b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
@@ -852,7 +852,7 @@ Value *InstCombiner::SimplifyShrShlDemandedBits(Instruction *Shr,
   unsigned ShrAmt = ShrOp1.getZExtValue();
 
   KnownOne.clearAllBits();
-  KnownZero = APInt::getBitsSet(KnownZero.getBitWidth(), 0, ShlAmt-1);
+  KnownZero = APInt::getLowBitsSet(KnownZero.getBitWidth(), ShlAmt - 1);
   KnownZero &= DemandedMask;
 
   APInt BitMask1(APInt::getAllOnesValue(BitWidth));