From: Philip Reames <listmail@philipreames.com>
Date: Thu, 26 Oct 2017 22:02:16 +0000 (+0000)
Subject: [SimplifyIndVars] Shorten code by using SCEV helper [NFC]
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=76074cad4dea68a13d7feed987f909439df6d4e2;p=llvm

[SimplifyIndVars] Shorten code by using SCEV helper [NFC]



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316709 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Utils/SimplifyIndVar.cpp b/lib/Transforms/Utils/SimplifyIndVar.cpp
index 08b84927c67..5263e8ccc6d 100644
--- a/lib/Transforms/Utils/SimplifyIndVar.cpp
+++ b/lib/Transforms/Utils/SimplifyIndVar.cpp
@@ -174,14 +174,11 @@ void SimplifyIndvar::eliminateIVComparison(ICmpInst *ICmp, Value *IVOperand) {
     Pred = ICmpInst::getSwappedPredicate(Pred);
   }
 
-  // Get the SCEVs for the ICmp operands.
-  const SCEV *S = SE->getSCEV(ICmp->getOperand(IVOperIdx));
-  const SCEV *X = SE->getSCEV(ICmp->getOperand(1 - IVOperIdx));
-
-  // Simplify unnecessary loops away.
+  // Get the SCEVs for the ICmp operands (in the specific context of the
+  // current loop)
   const Loop *ICmpLoop = LI->getLoopFor(ICmp->getParent());
-  S = SE->getSCEVAtScope(S, ICmpLoop);
-  X = SE->getSCEVAtScope(X, ICmpLoop);
+  const SCEV *S = SE->getSCEVAtScope(ICmp->getOperand(IVOperIdx), ICmpLoop);
+  const SCEV *X = SE->getSCEVAtScope(ICmp->getOperand(1 - IVOperIdx), ICmpLoop);
 
   ICmpInst::Predicate InvariantPredicate;
   const SCEV *InvariantLHS, *InvariantRHS;