[AMDGPU][AMDGPUIfConverter] create new pass (boilerplate only)

Author: jmmartinez

llvm/lib/Target/AMDGPU/AMDGPU.h

@@ -369,6 +369,9 @@ extern char &AMDGPUCodeGenPrepareID;
 void initializeAMDGPURemoveIncompatibleFunctionsPass(PassRegistry &);
 extern char &AMDGPURemoveIncompatibleFunctionsID;
 
+void initializeAMDGPUIfConverterPass(PassRegistry &);
+extern char &AMDGPUIfConverterID;
+
 void initializeAMDGPULateCodeGenPrepareLegacyPass(PassRegistry &);
 extern char &AMDGPULateCodeGenPrepareLegacyID;
 

llvm/lib/Target/AMDGPU/AMDGPUIfConverter.cpp

@@ -0,0 +1,32 @@
+#include <llvm/CodeGen/MachineFunctionPass.h>
+
+#include "AMDGPU.h"
+
+using namespace llvm;
+
+namespace {
+#define DEBUG_TYPE "amdgpu-if-cvt"
+const char PassName[] = "AMDGPU if conversion";
+
+class AMDGPUIfConverter : public MachineFunctionPass {
+public:
+  static char ID;
+
+  AMDGPUIfConverter() : MachineFunctionPass(ID) {}
+
+  bool runOnMachineFunction(MachineFunction &MF) override { return false; }
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override {
+    MachineFunctionPass::getAnalysisUsage(AU);
+  }
+
+  StringRef getPassName() const override { return PassName; }
+};
+
+char AMDGPUIfConverter::ID = 0;
+
+} // namespace
+
+char &llvm::AMDGPUIfConverterID = AMDGPUIfConverter::ID;
+INITIALIZE_PASS_BEGIN(AMDGPUIfConverter, DEBUG_TYPE, PassName, false, false)
+INITIALIZE_PASS_END(AMDGPUIfConverter, DEBUG_TYPE, PassName, false, false)

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

@@ -203,11 +203,6 @@ static VGPRRegisterRegAlloc fastRegAllocVGPR(
   "fast", "fast register allocator", createFastVGPRRegisterAllocator);
 } // anonymous namespace
 
-static cl::opt<bool>
-EnableEarlyIfConversion("amdgpu-early-ifcvt", cl::Hidden,
-                        cl::desc("Run early if-conversion"),
-                        cl::init(false));
-
 static cl::opt<bool>
 OptExecMaskPreRA("amdgpu-opt-exec-mask-pre-ra", cl::Hidden,
             cl::desc("Run pre-RA exec mask optimizations"),
@@ -447,6 +442,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUTarget() {
   initializeAMDGPURewriteUndefForPHILegacyPass(*PR);
   initializeAMDGPUUnifyMetadataPass(*PR);
   initializeSIAnnotateControlFlowLegacyPass(*PR);
+  initializeAMDGPUIfConverterPass(*PR);
   initializeAMDGPUInsertSingleUseVDSTPass(*PR);
   initializeAMDGPUInsertDelayAluPass(*PR);
   initializeSIInsertHardClausesPass(*PR);
@@ -1285,9 +1281,7 @@ void GCNPassConfig::addMachineSSAOptimization() {
 }
 
 bool GCNPassConfig::addILPOpts() {
-  if (EnableEarlyIfConversion)
-    addPass(&EarlyIfConverterID);
-
+  addPass(&AMDGPUIfConverterID);
   TargetPassConfig::addILPOpts();
   return false;
 }

llvm/lib/Target/AMDGPU/CMakeLists.txt

@@ -59,6 +59,7 @@ add_llvm_target(AMDGPUCodeGen
   AMDGPUGlobalISelDivergenceLowering.cpp
   AMDGPUGlobalISelUtils.cpp
   AMDGPUHSAMetadataStreamer.cpp
+  AMDGPUIfConverter.cpp
   AMDGPUInsertDelayAlu.cpp
   AMDGPUInstCombineIntrinsic.cpp
   AMDGPUInstrInfo.cpp