[llvm] [NewPM] Remove Delinearization legacy pass (PR #72942)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/72942

This pass isn't used/tested anywhere in upstream LLVM, so remove it.

>From abbf00c3d48c42a47b81b0126cbc4c01c1268c4d Mon Sep 17 00:00:00 2001
From: Aiden Grossman <agrossman154 at yahoo.com>
Date: Mon, 20 Nov 2023 18:22:00 -0800
Subject: [PATCH] [NewPM] Remove Delinearization legacy pass

This pass isn't used/tested anywhere in upstream LLVM, so remove it.
---
 llvm/include/llvm/Analysis/Passes.h   |  7 ----
 llvm/include/llvm/InitializePasses.h  |  1 -
 llvm/lib/Analysis/Analysis.cpp        |  1 -
 llvm/lib/Analysis/Delinearization.cpp | 46 ---------------------------
 4 files changed, 55 deletions(-)

diff --git a/llvm/include/llvm/Analysis/Passes.h b/llvm/include/llvm/Analysis/Passes.h
index ac1bc3549910c8c..58f425f43aec670 100644
--- a/llvm/include/llvm/Analysis/Passes.h
+++ b/llvm/include/llvm/Analysis/Passes.h
@@ -39,13 +39,6 @@ namespace llvm {
   //
   FunctionPass *createCostModelAnalysisPass();
 
-  //===--------------------------------------------------------------------===//
-  //
-  // createDelinearizationPass - This pass implements attempts to restore
-  // multidimensional array indices from linearized expressions.
-  //
-  FunctionPass *createDelinearizationPass();
-
   //===--------------------------------------------------------------------===//
   //
   // Minor pass prototypes, allowing us to expose them through bugpoint and
diff --git a/llvm/include/llvm/InitializePasses.h b/llvm/include/llvm/InitializePasses.h
index 2305db4f775d49c..5f2b397435dee9e 100644
--- a/llvm/include/llvm/InitializePasses.h
+++ b/llvm/include/llvm/InitializePasses.h
@@ -90,7 +90,6 @@ void initializeDAHPass(PassRegistry&);
 void initializeDCELegacyPassPass(PassRegistry&);
 void initializeDeadMachineInstructionElimPass(PassRegistry&);
 void initializeDebugifyMachineModulePass(PassRegistry &);
-void initializeDelinearizationPass(PassRegistry&);
 void initializeDependenceAnalysisWrapperPassPass(PassRegistry&);
 void initializeDetectDeadLanesPass(PassRegistry&);
 void initializeDomOnlyPrinterWrapperPassPass(PassRegistry &);
diff --git a/llvm/lib/Analysis/Analysis.cpp b/llvm/lib/Analysis/Analysis.cpp
index 80ea80303644449..b3c11873947267b 100644
--- a/llvm/lib/Analysis/Analysis.cpp
+++ b/llvm/lib/Analysis/Analysis.cpp
@@ -32,7 +32,6 @@ void llvm::initializeAnalysis(PassRegistry &Registry) {
   initializeCFGOnlyPrinterLegacyPassPass(Registry);
   initializeCycleInfoWrapperPassPass(Registry);
   initializeDependenceAnalysisWrapperPassPass(Registry);
-  initializeDelinearizationPass(Registry);
   initializeDominanceFrontierWrapperPassPass(Registry);
   initializeDomViewerWrapperPassPass(Registry);
   initializeDomPrinterWrapperPassPass(Registry);
diff --git a/llvm/lib/Analysis/Delinearization.cpp b/llvm/lib/Analysis/Delinearization.cpp
index 7ab91b9eaea4ed9..a45d8815e54ce9c 100644
--- a/llvm/lib/Analysis/Delinearization.cpp
+++ b/llvm/lib/Analysis/Delinearization.cpp
@@ -25,8 +25,6 @@
 #include "llvm/IR/InstIterator.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/PassManager.h"
-#include "llvm/InitializePasses.h"
-#include "llvm/Pass.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 
@@ -561,24 +559,6 @@ bool llvm::tryDelinearizeFixedSizeImpl(
 
 namespace {
 
-class Delinearization : public FunctionPass {
-  Delinearization(const Delinearization &); // do not implement
-protected:
-  Function *F;
-  LoopInfo *LI;
-  ScalarEvolution *SE;
-
-public:
-  static char ID; // Pass identification, replacement for typeid
-
-  Delinearization() : FunctionPass(ID) {
-    initializeDelinearizationPass(*PassRegistry::getPassRegistry());
-  }
-  bool runOnFunction(Function &F) override;
-  void getAnalysisUsage(AnalysisUsage &AU) const override;
-  void print(raw_ostream &O, const Module *M = nullptr) const override;
-};
-
 void printDelinearization(raw_ostream &O, Function *F, LoopInfo *LI,
                           ScalarEvolution *SE) {
   O << "Delinearization on function " << F->getName() << ":\n";
@@ -631,32 +611,6 @@ void printDelinearization(raw_ostream &O, Function *F, LoopInfo *LI,
 
 } // end anonymous namespace
 
-void Delinearization::getAnalysisUsage(AnalysisUsage &AU) const {
-  AU.setPreservesAll();
-  AU.addRequired<LoopInfoWrapperPass>();
-  AU.addRequired<ScalarEvolutionWrapperPass>();
-}
-
-bool Delinearization::runOnFunction(Function &F) {
-  this->F = &F;
-  SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
-  LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
-  return false;
-}
-
-void Delinearization::print(raw_ostream &O, const Module *) const {
-  printDelinearization(O, F, LI, SE);
-}
-
-char Delinearization::ID = 0;
-static const char delinearization_name[] = "Delinearization";
-INITIALIZE_PASS_BEGIN(Delinearization, DL_NAME, delinearization_name, true,
-                      true)
-INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
-INITIALIZE_PASS_END(Delinearization, DL_NAME, delinearization_name, true, true)
-
-FunctionPass *llvm::createDelinearizationPass() { return new Delinearization; }
-
 DelinearizationPrinterPass::DelinearizationPrinterPass(raw_ostream &OS)
     : OS(OS) {}
 PreservedAnalyses DelinearizationPrinterPass::run(Function &F,