[CodeGen][NewPM] Port GCNPreRALongBranchReg to NPM. (llvm#125844)

Author: cdevadas

llvm/lib/Target/AMDGPU/AMDGPU.h

@@ -451,7 +451,7 @@ extern char &AMDGPUOpenCLEnqueuedBlockLoweringLegacyID;
 void initializeGCNNSAReassignPass(PassRegistry &);
 extern char &GCNNSAReassignID;
 
-void initializeGCNPreRALongBranchRegPass(PassRegistry &);
+void initializeGCNPreRALongBranchRegLegacyPass(PassRegistry &);
 extern char &GCNPreRALongBranchRegID;
 
 void initializeGCNPreRAOptimizationsPass(PassRegistry &);

llvm/lib/Target/AMDGPU/AMDGPUPassRegistry.def

@@ -97,6 +97,7 @@ FUNCTION_PASS_WITH_PARAMS(
 #define MACHINE_FUNCTION_PASS(NAME, CREATE_PASS)
 #endif
 MACHINE_FUNCTION_PASS("amdgpu-isel", AMDGPUISelDAGToDAGPass(*this))
+MACHINE_FUNCTION_PASS("amdgpu-pre-ra-long-branch-reg", GCNPreRALongBranchRegPass())
 MACHINE_FUNCTION_PASS("gcn-dpp-combine", GCNDPPCombinePass())
 MACHINE_FUNCTION_PASS("si-fix-sgpr-copies", SIFixSGPRCopiesPass())
 MACHINE_FUNCTION_PASS("si-fix-vgpr-copies", SIFixVGPRCopiesPass())
@@ -117,7 +118,6 @@ MACHINE_FUNCTION_PASS("si-wqm", SIWholeQuadModePass())
 #define DUMMY_MACHINE_FUNCTION_PASS(NAME, CREATE_PASS)
 DUMMY_MACHINE_FUNCTION_PASS("amdgpu-insert-delay-alu", AMDGPUInsertDelayAluPass())
 DUMMY_MACHINE_FUNCTION_PASS("amdgpu-nsa-reassign", GCNNSAReassignPass())
-DUMMY_MACHINE_FUNCTION_PASS("amdgpu-pre-ra-long-branch-reg", GCNPreRALongBranchRegPass())
 DUMMY_MACHINE_FUNCTION_PASS("amdgpu-pre-ra-optimizations", GCNPreRAOptimizationsPass())
 DUMMY_MACHINE_FUNCTION_PASS("amdgpu-rewrite-partial-reg-uses", GCNRewritePartialRegUsesPass())
 DUMMY_MACHINE_FUNCTION_PASS("amdgpu-set-wave-priority", AMDGPUSetWavePriorityPass())

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

@@ -32,6 +32,7 @@
 #include "AMDGPUWaitSGPRHazards.h"
 #include "GCNDPPCombine.h"
 #include "GCNIterativeScheduler.h"
+#include "GCNPreRALongBranchReg.h"
 #include "GCNSchedStrategy.h"
 #include "GCNVOPDUtils.h"
 #include "R600.h"
@@ -548,7 +549,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUTarget() {
   initializeAMDGPUResourceUsageAnalysisPass(*PR);
   initializeGCNNSAReassignPass(*PR);
   initializeGCNPreRAOptimizationsPass(*PR);
-  initializeGCNPreRALongBranchRegPass(*PR);
+  initializeGCNPreRALongBranchRegLegacyPass(*PR);
   initializeGCNRewritePartialRegUsesPass(*PR);
   initializeGCNRegPressurePrinterPass(*PR);
   initializeAMDGPUPreloadKernArgPrologLegacyPass(*PR);

llvm/lib/Target/AMDGPU/GCNPreRALongBranchReg.cpp

@@ -14,6 +14,7 @@
 // distrance threshold tuning of what is considered "long" is handled through
 // amdgpu-long-branch-factor cl argument which sets LongBranchFactor.
 //===----------------------------------------------------------------------===//
+#include "GCNPreRALongBranchReg.h"
 #include "AMDGPU.h"
 #include "GCNSubtarget.h"
 #include "SIMachineFunctionInfo.h"
@@ -36,7 +37,7 @@ static cl::opt<double> LongBranchFactor(
              "reserved. We lean towards always reserving a register for  "
              "long jumps"));
 
-class GCNPreRALongBranchReg : public MachineFunctionPass {
+class GCNPreRALongBranchReg {
 
   struct BasicBlockInfo {
     // Offset - Distance from the beginning of the function to the beginning
@@ -48,27 +49,39 @@ class GCNPreRALongBranchReg : public MachineFunctionPass {
   void generateBlockInfo(MachineFunction &MF,
                          SmallVectorImpl<BasicBlockInfo> &BlockInfo);
 
+public:
+  GCNPreRALongBranchReg() = default;
+  bool run(MachineFunction &MF);
+};
+
+class GCNPreRALongBranchRegLegacy : public MachineFunctionPass {
 public:
   static char ID;
-  GCNPreRALongBranchReg() : MachineFunctionPass(ID) {
-    initializeGCNPreRALongBranchRegPass(*PassRegistry::getPassRegistry());
+  GCNPreRALongBranchRegLegacy() : MachineFunctionPass(ID) {
+    initializeGCNPreRALongBranchRegLegacyPass(*PassRegistry::getPassRegistry());
   }
-  bool runOnMachineFunction(MachineFunction &MF) override;
+
+  bool runOnMachineFunction(MachineFunction &MF) override {
+    return GCNPreRALongBranchReg().run(MF);
+  }
+
   StringRef getPassName() const override {
     return "AMDGPU Pre-RA Long Branch Reg";
   }
+
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.setPreservesAll();
     MachineFunctionPass::getAnalysisUsage(AU);
   }
 };
 } // End anonymous namespace.
-char GCNPreRALongBranchReg::ID = 0;
 
-INITIALIZE_PASS(GCNPreRALongBranchReg, DEBUG_TYPE,
+char GCNPreRALongBranchRegLegacy::ID = 0;
+
+INITIALIZE_PASS(GCNPreRALongBranchRegLegacy, DEBUG_TYPE,
                 "AMDGPU Pre-RA Long Branch Reg", false, false)
 
-char &llvm::GCNPreRALongBranchRegID = GCNPreRALongBranchReg::ID;
+char &llvm::GCNPreRALongBranchRegID = GCNPreRALongBranchRegLegacy::ID;
 void GCNPreRALongBranchReg::generateBlockInfo(
     MachineFunction &MF, SmallVectorImpl<BasicBlockInfo> &BlockInfo) {
 
@@ -99,7 +112,8 @@ void GCNPreRALongBranchReg::generateBlockInfo(
     PrevNum = Num;
   }
 }
-bool GCNPreRALongBranchReg::runOnMachineFunction(MachineFunction &MF) {
+
+bool GCNPreRALongBranchReg::run(MachineFunction &MF) {
   const GCNSubtarget &STM = MF.getSubtarget<GCNSubtarget>();
   const SIInstrInfo *TII = STM.getInstrInfo();
   const SIRegisterInfo *TRI = STM.getRegisterInfo();
@@ -136,3 +150,10 @@ bool GCNPreRALongBranchReg::runOnMachineFunction(MachineFunction &MF) {
   }
   return false;
 }
+
+PreservedAnalyses
+GCNPreRALongBranchRegPass::run(MachineFunction &MF,
+                               MachineFunctionAnalysisManager &MFAM) {
+  GCNPreRALongBranchReg().run(MF);
+  return PreservedAnalyses::all();
+}

llvm/lib/Target/AMDGPU/GCNPreRALongBranchReg.h

@@ -0,0 +1,23 @@
+//===- GCNPreRALongBranchReg.h ----------------------------------*- C++- *-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_AMDGPU_GCNPRERALONGBRANCHREG_H
+#define LLVM_LIB_TARGET_AMDGPU_GCNPRERALONGBRANCHREG_H
+
+#include "llvm/CodeGen/MachinePassManager.h"
+
+namespace llvm {
+class GCNPreRALongBranchRegPass
+    : public PassInfoMixin<GCNPreRALongBranchRegPass> {
+public:
+  PreservedAnalyses run(MachineFunction &MF,
+                        MachineFunctionAnalysisManager &MFAM);
+};
+} // namespace llvm
+
+#endif // LLVM_LIB_TARGET_AMDGPU_GCNPRERALONGBRANCHREG_H