[LegacyPM] Remove legacy LoopRotate pass

Author: aeubanks

llvm/include/llvm/InitializePasses.h

@@ -164,7 +164,6 @@ void initializeLoopDataPrefetchLegacyPassPass(PassRegistry&);
 void initializeLoopExtractorLegacyPassPass(PassRegistry &);
 void initializeLoopInfoWrapperPassPass(PassRegistry&);
 void initializeLoopPassPass(PassRegistry&);
-void initializeLoopRotateLegacyPassPass(PassRegistry&);
 void initializeLoopSimplifyPass(PassRegistry&);
 void initializeLoopStrengthReducePass(PassRegistry&);
 void initializeLoopUnrollPass(PassRegistry&);

llvm/include/llvm/LinkAllPasses.h

@@ -89,7 +89,6 @@ namespace {
       (void) llvm::createLoopSimplifyPass();
       (void) llvm::createLoopStrengthReducePass();
       (void) llvm::createLoopUnrollPass();
-      (void) llvm::createLoopRotatePass();
       (void) llvm::createLowerConstantIntrinsicsPass();
       (void) llvm::createLowerGlobalDtorsLegacyPass();
       (void) llvm::createLowerInvokePass();

llvm/include/llvm/Transforms/Scalar.h

@@ -61,12 +61,6 @@ Pass *createLoopUnrollPass(int OptLevel = 2, bool OnlyWhenForced = false,
                            int Runtime = -1, int UpperBound = -1,
                            int AllowPeeling = -1);
 
-//===----------------------------------------------------------------------===//
-//
-// LoopRotate - This pass is a simple loop rotating pass.
-//
-Pass *createLoopRotatePass(int MaxHeaderSize = -1, bool PrepareForLTO = false);
-
 //===----------------------------------------------------------------------===//
 //
 // Reassociate - This pass reassociates commutative expressions in an order that

llvm/lib/Transforms/Scalar/LoopRotation.cpp

@@ -89,79 +89,3 @@ PreservedAnalyses LoopRotatePass::run(Loop &L, LoopAnalysisManager &AM,
     PA.preserve<MemorySSAAnalysis>();
   return PA;
 }
-
-namespace {
-
-class LoopRotateLegacyPass : public LoopPass {
-  unsigned MaxHeaderSize;
-  bool PrepareForLTO;
-
-public:
-  static char ID; // Pass ID, replacement for typeid
-  LoopRotateLegacyPass(int SpecifiedMaxHeaderSize = -1,
-                       bool PrepareForLTO = false)
-      : LoopPass(ID), PrepareForLTO(PrepareForLTO) {
-    initializeLoopRotateLegacyPassPass(*PassRegistry::getPassRegistry());
-    if (SpecifiedMaxHeaderSize == -1)
-      MaxHeaderSize = DefaultRotationThreshold;
-    else
-      MaxHeaderSize = unsigned(SpecifiedMaxHeaderSize);
-  }
-
-  // LCSSA form makes instruction renaming easier.
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.addRequired<AssumptionCacheTracker>();
-    AU.addRequired<TargetTransformInfoWrapperPass>();
-    AU.addPreserved<MemorySSAWrapperPass>();
-    getLoopAnalysisUsage(AU);
-
-    // Lazy BFI and BPI are marked as preserved here so LoopRotate
-    // can remain part of the same loop pass manager as LICM.
-    AU.addPreserved<LazyBlockFrequencyInfoPass>();
-    AU.addPreserved<LazyBranchProbabilityInfoPass>();
-  }
-
-  bool runOnLoop(Loop *L, LPPassManager &LPM) override {
-    if (skipLoop(L))
-      return false;
-    Function &F = *L->getHeader()->getParent();
-
-    auto *LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
-    const auto *TTI = &getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
-    auto *AC = &getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
-    auto &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
-    auto &SE = getAnalysis<ScalarEvolutionWrapperPass>().getSE();
-    const SimplifyQuery SQ = getBestSimplifyQuery(*this, F);
-    std::optional<MemorySSAUpdater> MSSAU;
-    // Not requiring MemorySSA and getting it only if available will split
-    // the loop pass pipeline when LoopRotate is being run first.
-    auto *MSSAA = getAnalysisIfAvailable<MemorySSAWrapperPass>();
-    if (MSSAA)
-      MSSAU = MemorySSAUpdater(&MSSAA->getMSSA());
-    // Vectorization requires loop-rotation. Use default threshold for loops the
-    // user explicitly marked for vectorization, even when header duplication is
-    // disabled.
-    int Threshold = hasVectorizeTransformation(L) == TM_ForcedByUser
-                        ? DefaultRotationThreshold
-                        : MaxHeaderSize;
-
-    return LoopRotation(L, LI, TTI, AC, &DT, &SE, MSSAU ? &*MSSAU : nullptr, SQ,
-                        false, Threshold, false,
-                        PrepareForLTO || PrepareForLTOOption);
-  }
-};
-} // end namespace
-
-char LoopRotateLegacyPass::ID = 0;
-INITIALIZE_PASS_BEGIN(LoopRotateLegacyPass, "loop-rotate", "Rotate Loops",
-                      false, false)
-INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
-INITIALIZE_PASS_DEPENDENCY(LoopPass)
-INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(MemorySSAWrapperPass)
-INITIALIZE_PASS_END(LoopRotateLegacyPass, "loop-rotate", "Rotate Loops", false,
-                    false)
-
-Pass *llvm::createLoopRotatePass(int MaxHeaderSize, bool PrepareForLTO) {
-  return new LoopRotateLegacyPass(MaxHeaderSize, PrepareForLTO);
-}

llvm/lib/Transforms/Scalar/Scalar.cpp

@@ -29,7 +29,6 @@ void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeInstSimplifyLegacyPassPass(Registry);
   initializeLegacyLICMPassPass(Registry);
   initializeLoopDataPrefetchLegacyPassPass(Registry);
-  initializeLoopRotateLegacyPassPass(Registry);
   initializeLoopStrengthReducePass(Registry);
   initializeLoopUnrollPass(Registry);
   initializeLowerAtomicLegacyPassPass(Registry);

polly/lib/Transform/Canonicalization.cpp

@@ -48,7 +48,6 @@ void polly::registerCanonicalicationPasses(llvm::legacy::PassManagerBase &PM) {
   PM.add(llvm::createTailCallEliminationPass());
   PM.add(llvm::createCFGSimplificationPass());
   PM.add(llvm::createReassociatePass());
-  PM.add(llvm::createLoopRotatePass());
   if (PollyInliner) {
     PM.add(llvm::createPromoteMemoryToRegisterPass());
     PM.add(llvm::createCFGSimplificationPass());