[llvm] [NewPM] Remove LoopSinkLegacy Pass (PR #72811)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/72811

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

>From feecb73d339a0472c99daf7fcb6228273ff31717 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <agrossman154 at yahoo.com>
Date: Sun, 19 Nov 2023 15:12:37 -0800
Subject: [PATCH] [NewPM] Remove LoopSinkLegacy Pass

This pass isn't used anywhere and thus has no test coverage. For these
reasons, remove it.
---
 llvm/include/llvm/InitializePasses.h    |  1 -
 llvm/include/llvm/LinkAllPasses.h       |  1 -
 llvm/include/llvm/Transforms/Scalar.h   |  7 ---
 llvm/lib/Transforms/Scalar/LoopSink.cpp | 57 -------------------------
 llvm/lib/Transforms/Scalar/Scalar.cpp   |  1 -
 5 files changed, 67 deletions(-)

diff --git a/llvm/include/llvm/InitializePasses.h b/llvm/include/llvm/InitializePasses.h
index da38a38b87ebc4d..59c4b4c2ed4f544 100644
--- a/llvm/include/llvm/InitializePasses.h
+++ b/llvm/include/llvm/InitializePasses.h
@@ -158,7 +158,6 @@ void initializeLazyMachineBlockFrequencyInfoPassPass(PassRegistry&);
 void initializeLazyValueInfoPrinterPass(PassRegistry&);
 void initializeLazyValueInfoWrapperPassPass(PassRegistry&);
 void initializeLegacyLICMPassPass(PassRegistry&);
-void initializeLegacyLoopSinkPassPass(PassRegistry&);
 void initializeLegalizerPass(PassRegistry&);
 void initializeGISelCSEAnalysisWrapperPassPass(PassRegistry &);
 void initializeGISelKnownBitsAnalysisPass(PassRegistry &);
diff --git a/llvm/include/llvm/LinkAllPasses.h b/llvm/include/llvm/LinkAllPasses.h
index 3fc90e85c3533e2..00d464e9e41023c 100644
--- a/llvm/include/llvm/LinkAllPasses.h
+++ b/llvm/include/llvm/LinkAllPasses.h
@@ -88,7 +88,6 @@ namespace {
       (void) llvm::createKCFIPass();
       (void) llvm::createLCSSAPass();
       (void) llvm::createLICMPass();
-      (void) llvm::createLoopSinkPass();
       (void) llvm::createLazyValueInfoPass();
       (void) llvm::createLoopExtractorPass();
       (void) llvm::createLoopPredicationPass();
diff --git a/llvm/include/llvm/Transforms/Scalar.h b/llvm/include/llvm/Transforms/Scalar.h
index 0676f485f3fbcf4..8bf4409fa30ba24 100644
--- a/llvm/include/llvm/Transforms/Scalar.h
+++ b/llvm/include/llvm/Transforms/Scalar.h
@@ -71,13 +71,6 @@ 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.
diff --git a/llvm/lib/Transforms/Scalar/LoopSink.cpp b/llvm/lib/Transforms/Scalar/LoopSink.cpp
index 9f99f6214748bc5..6eedf95e7575ec8 100644
--- a/llvm/lib/Transforms/Scalar/LoopSink.cpp
+++ b/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(); }
diff --git a/llvm/lib/Transforms/Scalar/Scalar.cpp b/llvm/lib/Transforms/Scalar/Scalar.cpp
index 11bb8e936b74e7c..a56ac67b86cfafb 100644
--- a/llvm/lib/Transforms/Scalar/Scalar.cpp
+++ b/llvm/lib/Transforms/Scalar/Scalar.cpp
@@ -32,7 +32,6 @@ void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeInferAddressSpacesPass(Registry);
   initializeInstSimplifyLegacyPassPass(Registry);
   initializeLegacyLICMPassPass(Registry);
-  initializeLegacyLoopSinkPassPass(Registry);
   initializeLoopDataPrefetchLegacyPassPass(Registry);
   initializeLoopInstSimplifyLegacyPassPass(Registry);
   initializeLoopPredicationLegacyPassPass(Registry);