[NewPM] Remove LoopSinkLegacy Pass (#72811)

This pass isn't used anywhere and thus has no test coverage. For these
reasons, remove it.

Author: boomanaiden154

llvm/include/llvm/InitializePasses.h

@@ -157,7 +157,6 @@ void initializeLazyMachineBlockFrequencyInfoPassPass(PassRegistry&);
 void initializeLazyValueInfoPrinterPass(PassRegistry&);
 void initializeLazyValueInfoWrapperPassPass(PassRegistry&);
 void initializeLegacyLICMPassPass(PassRegistry&);
-void initializeLegacyLoopSinkPassPass(PassRegistry&);
 void initializeLegalizerPass(PassRegistry&);
 void initializeGISelCSEAnalysisWrapperPassPass(PassRegistry &);
 void initializeGISelKnownBitsAnalysisPass(PassRegistry &);

llvm/include/llvm/LinkAllPasses.h

@@ -87,7 +87,6 @@ namespace {
       (void) llvm::createKCFIPass();
       (void) llvm::createLCSSAPass();
       (void) llvm::createLICMPass();
-      (void) llvm::createLoopSinkPass();
       (void) llvm::createLazyValueInfoPass();
       (void) llvm::createLoopExtractorPass();
       (void) llvm::createLoopPredicationPass();

llvm/include/llvm/Transforms/Scalar.h

@@ -61,13 +61,6 @@ FunctionPass *createSROAPass(bool PreserveCFG = true);
 //
 Pass *createLICMPass();
 
-//===----------------------------------------------------------------------===//
-//
-// LoopSink - This pass sinks invariants from preheader to loop body where
-// frequency is lower than loop preheader.
-//
-Pass *createLoopSinkPass();
-
 //===----------------------------------------------------------------------===//
 //
 // LoopPredication - This pass does loop predication on guards.

llvm/lib/Transforms/Scalar/LoopSink.cpp

@@ -36,13 +36,11 @@
 #include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Analysis/BlockFrequencyInfo.h"
 #include "llvm/Analysis/LoopInfo.h"
-#include "llvm/Analysis/LoopPass.h"
 #include "llvm/Analysis/MemorySSA.h"
 #include "llvm/Analysis/MemorySSAUpdater.h"
 #include "llvm/Analysis/ScalarEvolution.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Instructions.h"
-#include "llvm/InitializePasses.h"
 #include "llvm/Support/BranchProbability.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Transforms/Scalar.h"
@@ -390,58 +388,3 @@ PreservedAnalyses LoopSinkPass::run(Function &F, FunctionAnalysisManager &FAM) {
 
   return PA;
 }
-
-namespace {
-struct LegacyLoopSinkPass : public LoopPass {
-  static char ID;
-  LegacyLoopSinkPass() : LoopPass(ID) {
-    initializeLegacyLoopSinkPassPass(*PassRegistry::getPassRegistry());
-  }
-
-  bool runOnLoop(Loop *L, LPPassManager &LPM) override {
-    if (skipLoop(L))
-      return false;
-
-    BasicBlock *Preheader = L->getLoopPreheader();
-    if (!Preheader)
-      return false;
-
-    // Enable LoopSink only when runtime profile is available.
-    // With static profile, the sinking decision may be sub-optimal.
-    if (!Preheader->getParent()->hasProfileData())
-      return false;
-
-    AAResults &AA = getAnalysis<AAResultsWrapperPass>().getAAResults();
-    MemorySSA &MSSA = getAnalysis<MemorySSAWrapperPass>().getMSSA();
-    auto *SE = getAnalysisIfAvailable<ScalarEvolutionWrapperPass>();
-    bool Changed = sinkLoopInvariantInstructions(
-        *L, AA, getAnalysis<LoopInfoWrapperPass>().getLoopInfo(),
-        getAnalysis<DominatorTreeWrapperPass>().getDomTree(),
-        getAnalysis<BlockFrequencyInfoWrapperPass>().getBFI(),
-        MSSA, SE ? &SE->getSE() : nullptr);
-
-    if (VerifyMemorySSA)
-      MSSA.verifyMemorySSA();
-
-    return Changed;
-  }
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.setPreservesCFG();
-    AU.addRequired<BlockFrequencyInfoWrapperPass>();
-    getLoopAnalysisUsage(AU);
-    AU.addRequired<MemorySSAWrapperPass>();
-    AU.addPreserved<MemorySSAWrapperPass>();
-  }
-};
-}
-
-char LegacyLoopSinkPass::ID = 0;
-INITIALIZE_PASS_BEGIN(LegacyLoopSinkPass, "loop-sink", "Loop Sink", false,
-                      false)
-INITIALIZE_PASS_DEPENDENCY(LoopPass)
-INITIALIZE_PASS_DEPENDENCY(BlockFrequencyInfoWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(MemorySSAWrapperPass)
-INITIALIZE_PASS_END(LegacyLoopSinkPass, "loop-sink", "Loop Sink", false, false)
-
-Pass *llvm::createLoopSinkPass() { return new LegacyLoopSinkPass(); }

llvm/lib/Transforms/Scalar/Scalar.cpp

@@ -31,7 +31,6 @@ void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeInferAddressSpacesPass(Registry);
   initializeInstSimplifyLegacyPassPass(Registry);
   initializeLegacyLICMPassPass(Registry);
-  initializeLegacyLoopSinkPassPass(Registry);
   initializeLoopDataPrefetchLegacyPassPass(Registry);
   initializeLoopInstSimplifyLegacyPassPass(Registry);
   initializeLoopPredicationLegacyPassPass(Registry);