[LoopRotate] Unconditionally get ScalarEvolution.

Summary: LoopRotate is a loop pass and SE should always be available.

Reviewers: anemet, asbirlea

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D68573

llvm-svn: 374026

1 files changed, 2 insertions, 3 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopRotation.cpp b/llvm/lib/Transforms/Scalar/LoopRotation.cpp
index 95e2316c20d..3585b71748a 100644
--- a/llvm/lib/Transforms/Scalar/LoopRotation.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopRotation.cpp
@@ -96,15 +96,14 @@ public:
     auto *AC = &getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
     auto *DTWP = getAnalysisIfAvailable<DominatorTreeWrapperPass>();
     auto *DT = DTWP ? &DTWP->getDomTree() : nullptr;
-    auto *SEWP = getAnalysisIfAvailable<ScalarEvolutionWrapperPass>();
-    auto *SE = SEWP ? &SEWP->getSE() : nullptr;
+    auto &SE = getAnalysis<ScalarEvolutionWrapperPass>().getSE();
     const SimplifyQuery SQ = getBestSimplifyQuery(*this, F);
     Optional<MemorySSAUpdater> MSSAU;
     if (EnableMSSALoopDependency) {
       MemorySSA *MSSA = &getAnalysis<MemorySSAWrapperPass>().getMSSA();
       MSSAU = MemorySSAUpdater(MSSA);
     }
-    return LoopRotation(L, LI, TTI, AC, DT, SE,
+    return LoopRotation(L, LI, TTI, AC, DT, &SE,
                         MSSAU.hasValue() ? MSSAU.getPointer() : nullptr, SQ,
                         false, MaxHeaderSize, false);
   }