[llvm] AMDGPU: Remove legacy PM version of AMDGPUPromoteAllocaToVector (PR #144986)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/144986

This is only run in the middle end with the new pass manager now,
so garbage collect the old PM version.

>From e60c1dc1b0b53ad79fcdd15e9efc12f65bed672d Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Fri, 20 Jun 2025 14:56:23 +0900
Subject: [PATCH] AMDGPU: Remove legacy PM version of
 AMDGPUPromoteAllocaToVector

This is only run in the middle end with the new pass manager now,
so garbage collect the old PM version.
---
 llvm/lib/Target/AMDGPU/AMDGPU.h               |  4 --
 .../lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp | 40 -------------------
 .../lib/Target/AMDGPU/AMDGPUTargetMachine.cpp |  1 -
 3 files changed, 45 deletions(-)

diff --git a/llvm/lib/Target/AMDGPU/AMDGPU.h b/llvm/lib/Target/AMDGPU/AMDGPU.h
index 5a917734e9c74..0ad18c38213ff 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPU.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPU.h
@@ -242,10 +242,6 @@ FunctionPass *createAMDGPUPromoteAlloca();
 void initializeAMDGPUPromoteAllocaPass(PassRegistry&);
 extern char &AMDGPUPromoteAllocaID;
 
-FunctionPass *createAMDGPUPromoteAllocaToVector();
-void initializeAMDGPUPromoteAllocaToVectorPass(PassRegistry&);
-extern char &AMDGPUPromoteAllocaToVectorID;
-
 struct AMDGPUPromoteAllocaPass : PassInfoMixin<AMDGPUPromoteAllocaPass> {
   AMDGPUPromoteAllocaPass(TargetMachine &TM) : TM(TM) {}
   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp b/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
index 700dc87d2f821..e0f3c72890b0f 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
@@ -167,34 +167,6 @@ class AMDGPUPromoteAlloca : public FunctionPass {
   }
 };
 
-class AMDGPUPromoteAllocaToVector : public FunctionPass {
-public:
-  static char ID;
-
-  AMDGPUPromoteAllocaToVector() : FunctionPass(ID) {}
-
-  bool runOnFunction(Function &F) override {
-    if (skipFunction(F))
-      return false;
-    if (auto *TPC = getAnalysisIfAvailable<TargetPassConfig>())
-      return AMDGPUPromoteAllocaImpl(
-                 TPC->getTM<TargetMachine>(),
-                 getAnalysis<LoopInfoWrapperPass>().getLoopInfo())
-          .run(F, /*PromoteToLDS*/ false);
-    return false;
-  }
-
-  StringRef getPassName() const override {
-    return "AMDGPU Promote Alloca to vector";
-  }
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.setPreservesCFG();
-    AU.addRequired<LoopInfoWrapperPass>();
-    FunctionPass::getAnalysisUsage(AU);
-  }
-};
-
 static unsigned getMaxVGPRs(unsigned LDSBytes, const TargetMachine &TM,
                             const Function &F) {
   if (!TM.getTargetTriple().isAMDGCN())
@@ -216,7 +188,6 @@ static unsigned getMaxVGPRs(unsigned LDSBytes, const TargetMachine &TM,
 } // end anonymous namespace
 
 char AMDGPUPromoteAlloca::ID = 0;
-char AMDGPUPromoteAllocaToVector::ID = 0;
 
 INITIALIZE_PASS_BEGIN(AMDGPUPromoteAlloca, DEBUG_TYPE,
                       "AMDGPU promote alloca to vector or LDS", false, false)
@@ -227,14 +198,7 @@ INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
 INITIALIZE_PASS_END(AMDGPUPromoteAlloca, DEBUG_TYPE,
                     "AMDGPU promote alloca to vector or LDS", false, false)
 
-INITIALIZE_PASS_BEGIN(AMDGPUPromoteAllocaToVector, DEBUG_TYPE "-to-vector",
-                      "AMDGPU promote alloca to vector", false, false)
-INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
-INITIALIZE_PASS_END(AMDGPUPromoteAllocaToVector, DEBUG_TYPE "-to-vector",
-                    "AMDGPU promote alloca to vector", false, false)
-
 char &llvm::AMDGPUPromoteAllocaID = AMDGPUPromoteAlloca::ID;
-char &llvm::AMDGPUPromoteAllocaToVectorID = AMDGPUPromoteAllocaToVector::ID;
 
 PreservedAnalyses AMDGPUPromoteAllocaPass::run(Function &F,
                                                FunctionAnalysisManager &AM) {
@@ -264,10 +228,6 @@ FunctionPass *llvm::createAMDGPUPromoteAlloca() {
   return new AMDGPUPromoteAlloca();
 }
 
-FunctionPass *llvm::createAMDGPUPromoteAllocaToVector() {
-  return new AMDGPUPromoteAllocaToVector();
-}
-
 static void collectAllocaUses(AllocaInst &Alloca,
                               SmallVectorImpl<Use *> &Uses) {
   SmallVector<Instruction *, 4> WorkList({&Alloca});
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
index f390d39043ed5..074beccef33c1 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -529,7 +529,6 @@ extern "C" LLVM_ABI LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUTarget() {
   initializeAMDGPUPreLegalizerCombinerPass(*PR);
   initializeAMDGPURegBankCombinerPass(*PR);
   initializeAMDGPUPromoteAllocaPass(*PR);
-  initializeAMDGPUPromoteAllocaToVectorPass(*PR);
   initializeAMDGPUCodeGenPreparePass(*PR);
   initializeAMDGPULateCodeGenPrepareLegacyPass(*PR);
   initializeAMDGPURemoveIncompatibleFunctionsLegacyPass(*PR);