[CodeGen][NPM] Port DetectDeadLanes to NPM

llvm/include/llvm/CodeGen/DetectDeadLanes.h

@@ -29,6 +29,7 @@
 #define LLVM_CODEGEN_DETECTDEADLANES_H
 
 #include "llvm/ADT/BitVector.h"
+#include "llvm/CodeGen/MachinePassManager.h"
 #include "llvm/MC/LaneBitmask.h"
 #include <deque>
 
@@ -115,6 +116,13 @@ class DeadLaneDetector {
   BitVector DefinedByCopy;
 };
 
+class DetectDeadLanesPass : public PassInfoMixin<DetectDeadLanesPass> {
+public:
+  PreservedAnalyses run(MachineFunction &MF,
+                        MachineFunctionAnalysisManager &MFAM);
+  static bool isRequired() { return true; }
+};
+
 } // end namespace llvm
 
 #endif // LLVM_CODEGEN_DETECTDEADLANES_H

llvm/include/llvm/InitializePasses.h

@@ -89,7 +89,7 @@ void initializeDXILResourceTypeWrapperPassPass(PassRegistry &);
 void initializeDeadMachineInstructionElimPass(PassRegistry &);
 void initializeDebugifyMachineModulePass(PassRegistry &);
 void initializeDependenceAnalysisWrapperPassPass(PassRegistry &);
-void initializeDetectDeadLanesPass(PassRegistry &);
+void initializeDetectDeadLanesLegacyPass(PassRegistry &);
 void initializeDomOnlyPrinterWrapperPassPass(PassRegistry &);
 void initializeDomOnlyViewerWrapperPassPass(PassRegistry &);
 void initializeDomPrinterWrapperPassPass(PassRegistry &);

llvm/include/llvm/Passes/CodeGenPassBuilder.h

@@ -26,6 +26,7 @@
 #include "llvm/CodeGen/CallBrPrepare.h"
 #include "llvm/CodeGen/CodeGenPrepare.h"
 #include "llvm/CodeGen/DeadMachineInstructionElim.h"
+#include "llvm/CodeGen/DetectDeadLanes.h"
 #include "llvm/CodeGen/DwarfEHPrepare.h"
 #include "llvm/CodeGen/EarlyIfConversion.h"
 #include "llvm/CodeGen/ExpandLargeDivRem.h"

llvm/include/llvm/Passes/MachinePassRegistry.def

@@ -138,6 +138,7 @@ MACHINE_FUNCTION_ANALYSIS("virtregmap", VirtRegMapAnalysis())
 #define MACHINE_FUNCTION_PASS(NAME, CREATE_PASS)
 #endif
 MACHINE_FUNCTION_PASS("dead-mi-elimination", DeadMachineInstructionElimPass())
+MACHINE_FUNCTION_PASS("detect-dead-lanes", DetectDeadLanesPass())
 MACHINE_FUNCTION_PASS("early-ifcvt", EarlyIfConverterPass())
 MACHINE_FUNCTION_PASS("early-machinelicm", EarlyMachineLICMPass())
 MACHINE_FUNCTION_PASS("early-tailduplication", EarlyTailDuplicatePass())
@@ -249,7 +250,6 @@ DUMMY_MACHINE_FUNCTION_PASS("break-false-deps", BreakFalseDepsPass)
 DUMMY_MACHINE_FUNCTION_PASS("cfguard-longjmp", CFGuardLongjmpPass)
 DUMMY_MACHINE_FUNCTION_PASS("cfi-fixup", CFIFixupPass)
 DUMMY_MACHINE_FUNCTION_PASS("cfi-instr-inserter", CFIInstrInserterPass)
-DUMMY_MACHINE_FUNCTION_PASS("detect-dead-lanes", DetectDeadLanesPass)
 DUMMY_MACHINE_FUNCTION_PASS("dot-machine-cfg", MachineCFGPrinter)
 DUMMY_MACHINE_FUNCTION_PASS("fentry-insert", FEntryInserterPass)
 DUMMY_MACHINE_FUNCTION_PASS("fs-profile-loader", MIRProfileLoaderNewPass)

llvm/lib/CodeGen/CodeGen.cpp

@@ -33,7 +33,7 @@ void llvm::initializeCodeGen(PassRegistry &Registry) {
   initializeCodeGenPrepareLegacyPassPass(Registry);
   initializeDeadMachineInstructionElimPass(Registry);
   initializeDebugifyMachineModulePass(Registry);
-  initializeDetectDeadLanesPass(Registry);
+  initializeDetectDeadLanesLegacyPass(Registry);
   initializeDwarfEHPrepareLegacyPassPass(Registry);
   initializeEarlyIfConverterLegacyPass(Registry);
   initializeEarlyIfPredicatorPass(Registry);

llvm/lib/CodeGen/DetectDeadLanes.cpp

@@ -373,19 +373,9 @@ LaneBitmask DeadLaneDetector::determineInitialUsedLanes(Register Reg) {
 
 namespace {
 
-class DetectDeadLanes : public MachineFunctionPass {
+class DetectDeadLanes {
 public:
-  bool runOnMachineFunction(MachineFunction &MF) override;
-
-  static char ID;
-  DetectDeadLanes() : MachineFunctionPass(ID) {}
-
-  StringRef getPassName() const override { return "Detect Dead Lanes"; }
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.setPreservesCFG();
-    MachineFunctionPass::getAnalysisUsage(AU);
-  }
+  bool run(MachineFunction &MF);
 
 private:
   /// update the operand status.
@@ -407,12 +397,29 @@ class DetectDeadLanes : public MachineFunctionPass {
   const TargetRegisterInfo *TRI = nullptr;
 };
 
+struct DetectDeadLanesLegacy : public MachineFunctionPass {
+  static char ID;
+  DetectDeadLanesLegacy() : MachineFunctionPass(ID) {}
+
+  StringRef getPassName() const override { return "Detect Dead Lanes"; }
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override {
+    AU.setPreservesCFG();
+    MachineFunctionPass::getAnalysisUsage(AU);
+  }
+
+  bool runOnMachineFunction(MachineFunction &MF) override {
+    return DetectDeadLanes().run(MF);
+  }
+};
+
 } // end anonymous namespace
 
-char DetectDeadLanes::ID = 0;
-char &llvm::DetectDeadLanesID = DetectDeadLanes::ID;
+char DetectDeadLanesLegacy::ID = 0;
+char &llvm::DetectDeadLanesID = DetectDeadLanesLegacy::ID;
 
-INITIALIZE_PASS(DetectDeadLanes, DEBUG_TYPE, "Detect Dead Lanes", false, false)
+INITIALIZE_PASS(DetectDeadLanesLegacy, DEBUG_TYPE, "Detect Dead Lanes", false,
+                false)
 
 bool DetectDeadLanes::isUndefRegAtInput(
     const MachineOperand &MO, const DeadLaneDetector::VRegInfo &RegInfo) const {
@@ -537,7 +544,17 @@ DetectDeadLanes::modifySubRegisterOperandStatus(const DeadLaneDetector &DLD,
   return std::make_pair(Changed, Again);
 }
 
-bool DetectDeadLanes::runOnMachineFunction(MachineFunction &MF) {
+PreservedAnalyses
+DetectDeadLanesPass::run(MachineFunction &MF,
+                         MachineFunctionAnalysisManager &MFAM) {
+  if (!DetectDeadLanes().run(MF))
+    return PreservedAnalyses::all();
+  auto PA = getMachineFunctionPassPreservedAnalyses();
+  PA.preserveSet<CFGAnalyses>();
+  return PA;
+}
+
+bool DetectDeadLanes::run(MachineFunction &MF) {
   // Don't bother if we won't track subregister liveness later.  This pass is
   // required for correctness if subregister liveness is enabled because the
   // register coalescer cannot deal with hidden dead defs. However without

llvm/lib/Passes/PassBuilder.cpp

@@ -84,6 +84,7 @@
 #include "llvm/CodeGen/CodeGenPrepare.h"
 #include "llvm/CodeGen/ComplexDeinterleavingPass.h"
 #include "llvm/CodeGen/DeadMachineInstructionElim.h"
+#include "llvm/CodeGen/DetectDeadLanes.h"
 #include "llvm/CodeGen/DwarfEHPrepare.h"
 #include "llvm/CodeGen/EarlyIfConversion.h"
 #include "llvm/CodeGen/EdgeBundles.h"

llvm/test/CodeGen/AMDGPU/detect-dead-lanes.mir

@@ -1,4 +1,5 @@
 # RUN: llc -mtriple=amdgcn -run-pass detect-dead-lanes -o - %s | FileCheck %s
+# RUN: llc -mtriple=amdgcn -passes detect-dead-lanes -o - %s | FileCheck %s
 ...
 ---
 # Combined use/def transfer check, the basics.