1 files changed, 153 insertions, 0 deletions
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUPreLegalizerCombiner.cpp b/llvm/lib/Target/AMDGPU/AMDGPUPreLegalizerCombiner.cpp
new file mode 100644
index 000000000000..800ad2039f0e
--- /dev/null
+++ b/llvm/lib/Target/AMDGPU/AMDGPUPreLegalizerCombiner.cpp
@@ -0,0 +1,153 @@
+//=== lib/CodeGen/GlobalISel/AMDGPUPreLegalizerCombiner.cpp ---------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass does combining of machine instructions at the generic MI level,
+// before the legalizer.
+//
+//===----------------------------------------------------------------------===//
+
+#include "AMDGPUTargetMachine.h"
+#include "llvm/CodeGen/GlobalISel/Combiner.h"
+#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
+#include "llvm/CodeGen/GlobalISel/CombinerInfo.h"
+#include "llvm/CodeGen/GlobalISel/GISelKnownBits.h"
+#include "llvm/CodeGen/GlobalISel/MIPatternMatch.h"
+#include "llvm/CodeGen/MachineDominators.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/TargetPassConfig.h"
+#include "llvm/Support/Debug.h"
+#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
+
+#define DEBUG_TYPE "amdgpu-prelegalizer-combiner"
+
+using namespace llvm;
+using namespace MIPatternMatch;
+
+#define AMDGPUPRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_DEPS
+#include "AMDGPUGenPreLegalizeGICombiner.inc"
+#undef AMDGPUPRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_DEPS
+
+namespace {
+#define AMDGPUPRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_H
+#include "AMDGPUGenPreLegalizeGICombiner.inc"
+#undef AMDGPUPRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_H
+
+class AMDGPUPreLegalizerCombinerInfo : public CombinerInfo {
+  GISelKnownBits *KB;
+  MachineDominatorTree *MDT;
+
+public:
+  AMDGPUGenPreLegalizerCombinerHelperRuleConfig GeneratedRuleCfg;
+
+  AMDGPUPreLegalizerCombinerInfo(bool EnableOpt, bool OptSize, bool MinSize,
+                                  GISelKnownBits *KB, MachineDominatorTree *MDT)
+      : CombinerInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false,
+                     /*LegalizerInfo*/ nullptr, EnableOpt, OptSize, MinSize),
+        KB(KB), MDT(MDT) {
+    if (!GeneratedRuleCfg.parseCommandLineOption())
+      report_fatal_error("Invalid rule identifier");
+  }
+
+  virtual bool combine(GISelChangeObserver &Observer, MachineInstr &MI,
+                       MachineIRBuilder &B) const override;
+};
+
+bool AMDGPUPreLegalizerCombinerInfo::combine(GISelChangeObserver &Observer,
+                                              MachineInstr &MI,
+                                              MachineIRBuilder &B) const {
+  CombinerHelper Helper(Observer, B, KB, MDT);
+  AMDGPUGenPreLegalizerCombinerHelper Generated(GeneratedRuleCfg);
+
+  if (Generated.tryCombineAll(Observer, MI, B, Helper))
+    return true;
+
+  switch (MI.getOpcode()) {
+  case TargetOpcode::G_CONCAT_VECTORS:
+    return Helper.tryCombineConcatVectors(MI);
+  case TargetOpcode::G_SHUFFLE_VECTOR:
+    return Helper.tryCombineShuffleVector(MI);
+  }
+
+  return false;
+}
+
+#define AMDGPUPRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_CPP
+#include "AMDGPUGenPreLegalizeGICombiner.inc"
+#undef AMDGPUPRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_CPP
+
+// Pass boilerplate
+// ================
+
+class AMDGPUPreLegalizerCombiner : public MachineFunctionPass {
+public:
+  static char ID;
+
+  AMDGPUPreLegalizerCombiner(bool IsOptNone = false);
+
+  StringRef getPassName() const override {
+    return "AMDGPUPreLegalizerCombiner";
+  }
+
+  bool runOnMachineFunction(MachineFunction &MF) override;
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
+private:
+  bool IsOptNone;
+};
+} // end anonymous namespace
+
+void AMDGPUPreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.addRequired<TargetPassConfig>();
+  AU.setPreservesCFG();
+  getSelectionDAGFallbackAnalysisUsage(AU);
+  AU.addRequired<GISelKnownBitsAnalysis>();
+  AU.addPreserved<GISelKnownBitsAnalysis>();
+  if (!IsOptNone) {
+    AU.addRequired<MachineDominatorTree>();
+    AU.addPreserved<MachineDominatorTree>();
+  }
+  MachineFunctionPass::getAnalysisUsage(AU);
+}
+
+AMDGPUPreLegalizerCombiner::AMDGPUPreLegalizerCombiner(bool IsOptNone)
+  : MachineFunctionPass(ID), IsOptNone(IsOptNone) {
+  initializeAMDGPUPreLegalizerCombinerPass(*PassRegistry::getPassRegistry());
+}
+
+bool AMDGPUPreLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) {
+  if (MF.getProperties().hasProperty(
+          MachineFunctionProperties::Property::FailedISel))
+    return false;
+  auto *TPC = &getAnalysis<TargetPassConfig>();
+  const Function &F = MF.getFunction();
+  bool EnableOpt =
+      MF.getTarget().getOptLevel() != CodeGenOpt::None && !skipFunction(F);
+  GISelKnownBits *KB = &getAnalysis<GISelKnownBitsAnalysis>().get(MF);
+  MachineDominatorTree *MDT =
+      IsOptNone ? nullptr : &getAnalysis<MachineDominatorTree>();
+  AMDGPUPreLegalizerCombinerInfo PCInfo(EnableOpt, F.hasOptSize(),
+                                        F.hasMinSize(), KB, MDT);
+  Combiner C(PCInfo, TPC);
+  return C.combineMachineInstrs(MF, /*CSEInfo*/ nullptr);
+}
+
+char AMDGPUPreLegalizerCombiner::ID = 0;
+INITIALIZE_PASS_BEGIN(AMDGPUPreLegalizerCombiner, DEBUG_TYPE,
+                      "Combine AMDGPU machine instrs before legalization",
+                      false, false)
+INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
+INITIALIZE_PASS_DEPENDENCY(GISelKnownBitsAnalysis)
+INITIALIZE_PASS_END(AMDGPUPreLegalizerCombiner, DEBUG_TYPE,
+                    "Combine AMDGPU machine instrs before legalization", false,
+                    false)
+
+namespace llvm {
+FunctionPass *createAMDGPUPreLegalizeCombiner(bool IsOptNone) {
+  return new AMDGPUPreLegalizerCombiner(IsOptNone);
+}
+} // end namespace llvm