[NewPM] Remove LoopPredicationLegacyPass (#72944)

This pass isn't used/tested upstream anywhere, so remove it.
llvm · Nov 21, 2023 · 1366331 · 1366331
1 parent ddcd6d6
commit 1366331
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diff --git a/llvm/include/llvm/InitializePasses.h b/llvm/include/llvm/InitializePasses.h
@@ -172,7 +172,6 @@ void initializeLoopDataPrefetchLegacyPassPass(PassRegistry&);
 void initializeLoopExtractorLegacyPassPass(PassRegistry &);
 void initializeLoopInfoWrapperPassPass(PassRegistry&);
 void initializeLoopPassPass(PassRegistry&);
-void initializeLoopPredicationLegacyPassPass(PassRegistry&);
 void initializeLoopRotateLegacyPassPass(PassRegistry&);
 void initializeLoopSimplifyPass(PassRegistry&);
 void initializeLoopStrengthReducePass(PassRegistry&);

diff --git a/llvm/include/llvm/LinkAllPasses.h b/llvm/include/llvm/LinkAllPasses.h
@@ -86,7 +86,6 @@ namespace {
       (void) llvm::createLICMPass();
       (void) llvm::createLazyValueInfoPass();
       (void) llvm::createLoopExtractorPass();
-      (void) llvm::createLoopPredicationPass();
       (void) llvm::createLoopSimplifyPass();
       (void) llvm::createLoopStrengthReducePass();
       (void) llvm::createLoopUnrollPass();

diff --git a/llvm/include/llvm/Transforms/Scalar.h b/llvm/include/llvm/Transforms/Scalar.h
@@ -51,12 +51,6 @@ FunctionPass *createSROAPass(bool PreserveCFG = true);
 //
 Pass *createLICMPass();
 
-//===----------------------------------------------------------------------===//
-//
-// LoopPredication - This pass does loop predication on guards.
-//
-Pass *createLoopPredicationPass();
-
 //===----------------------------------------------------------------------===//
 //
 // LoopStrengthReduce - This pass is strength reduces GEP instructions that use

diff --git a/llvm/lib/Transforms/Scalar/LoopPredication.cpp b/llvm/lib/Transforms/Scalar/LoopPredication.cpp
@@ -327,49 +327,8 @@ class LoopPredication {
   bool runOnLoop(Loop *L);
 };
 
-class LoopPredicationLegacyPass : public LoopPass {
-public:
-  static char ID;
-  LoopPredicationLegacyPass() : LoopPass(ID) {
-    initializeLoopPredicationLegacyPassPass(*PassRegistry::getPassRegistry());
-  }
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.addRequired<BranchProbabilityInfoWrapperPass>();
-    getLoopAnalysisUsage(AU);
-    AU.addPreserved<MemorySSAWrapperPass>();
-  }
-
-  bool runOnLoop(Loop *L, LPPassManager &LPM) override {
-    if (skipLoop(L))
-      return false;
-    auto *SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
-    auto *LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
-    auto *DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
-    auto *MSSAWP = getAnalysisIfAvailable<MemorySSAWrapperPass>();
-    std::unique_ptr<MemorySSAUpdater> MSSAU;
-    if (MSSAWP)
-      MSSAU = std::make_unique<MemorySSAUpdater>(&MSSAWP->getMSSA());
-    auto *AA = &getAnalysis<AAResultsWrapperPass>().getAAResults();
-    LoopPredication LP(AA, DT, SE, LI, MSSAU ? MSSAU.get() : nullptr);
-    return LP.runOnLoop(L);
-  }
-};
-
-char LoopPredicationLegacyPass::ID = 0;
 } // end namespace
 
-INITIALIZE_PASS_BEGIN(LoopPredicationLegacyPass, "loop-predication",
-                      "Loop predication", false, false)
-INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfoWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(LoopPass)
-INITIALIZE_PASS_END(LoopPredicationLegacyPass, "loop-predication",
-                    "Loop predication", false, false)
-
-Pass *llvm::createLoopPredicationPass() {
-  return new LoopPredicationLegacyPass();
-}
-
 PreservedAnalyses LoopPredicationPass::run(Loop &L, LoopAnalysisManager &AM,
                                            LoopStandardAnalysisResults &AR,
                                            LPMUpdater &U) {

diff --git a/llvm/lib/Transforms/Scalar/Scalar.cpp b/llvm/lib/Transforms/Scalar/Scalar.cpp
@@ -30,7 +30,6 @@ void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeInstSimplifyLegacyPassPass(Registry);
   initializeLegacyLICMPassPass(Registry);
   initializeLoopDataPrefetchLegacyPassPass(Registry);
-  initializeLoopPredicationLegacyPassPass(Registry);
   initializeLoopRotateLegacyPassPass(Registry);
   initializeLoopStrengthReducePass(Registry);
   initializeLoopUnrollPass(Registry);