1 files changed, 102 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/Target/Mips/MipsPreLegalizerCombiner.cpp b/contrib/llvm-project/llvm/lib/Target/Mips/MipsPreLegalizerCombiner.cpp
new file mode 100644
index 000000000000..85076590d407
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+++ b/contrib/llvm-project/llvm/lib/Target/Mips/MipsPreLegalizerCombiner.cpp
@@ -0,0 +1,102 @@
+//=== lib/CodeGen/GlobalISel/MipsPreLegalizerCombiner.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 "MipsTargetMachine.h"
+#include "llvm/CodeGen/GlobalISel/Combiner.h"
+#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
+#include "llvm/CodeGen/GlobalISel/CombinerInfo.h"
+#include "llvm/CodeGen/GlobalISel/MIPatternMatch.h"
+#include "llvm/CodeGen/TargetPassConfig.h"
+
+#define DEBUG_TYPE "mips-prelegalizer-combiner"
+
+using namespace llvm;
+
+namespace {
+class MipsPreLegalizerCombinerInfo : public CombinerInfo {
+public:
+  MipsPreLegalizerCombinerInfo()
+      : CombinerInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false,
+                     /*LegalizerInfo*/ nullptr) {}
+  virtual bool combine(GISelChangeObserver &Observer, MachineInstr &MI,
+                       MachineIRBuilder &B) const override;
+};
+
+bool MipsPreLegalizerCombinerInfo::combine(GISelChangeObserver &Observer,
+                                           MachineInstr &MI,
+                                           MachineIRBuilder &B) const {
+  CombinerHelper Helper(Observer, B);
+
+  switch (MI.getOpcode()) {
+  default:
+    return false;
+  case TargetOpcode::G_LOAD:
+  case TargetOpcode::G_SEXTLOAD:
+  case TargetOpcode::G_ZEXTLOAD:
+    return Helper.tryCombineExtendingLoads(MI);
+  }
+  return false;
+}
+
+// Pass boilerplate
+// ================
+
+class MipsPreLegalizerCombiner : public MachineFunctionPass {
+public:
+  static char ID;
+
+  MipsPreLegalizerCombiner();
+
+  StringRef getPassName() const override { return "MipsPreLegalizerCombiner"; }
+
+  bool runOnMachineFunction(MachineFunction &MF) override;
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
+};
+} // end anonymous namespace
+
+void MipsPreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.addRequired<TargetPassConfig>();
+  AU.setPreservesCFG();
+  getSelectionDAGFallbackAnalysisUsage(AU);
+  MachineFunctionPass::getAnalysisUsage(AU);
+}
+
+MipsPreLegalizerCombiner::MipsPreLegalizerCombiner() : MachineFunctionPass(ID) {
+  initializeMipsPreLegalizerCombinerPass(*PassRegistry::getPassRegistry());
+}
+
+bool MipsPreLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) {
+  if (MF.getProperties().hasProperty(
+          MachineFunctionProperties::Property::FailedISel))
+    return false;
+  auto *TPC = &getAnalysis<TargetPassConfig>();
+  MipsPreLegalizerCombinerInfo PCInfo;
+  Combiner C(PCInfo, TPC);
+  return C.combineMachineInstrs(MF, nullptr);
+}
+
+char MipsPreLegalizerCombiner::ID = 0;
+INITIALIZE_PASS_BEGIN(MipsPreLegalizerCombiner, DEBUG_TYPE,
+                      "Combine Mips machine instrs before legalization", false,
+                      false)
+INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
+INITIALIZE_PASS_END(MipsPreLegalizerCombiner, DEBUG_TYPE,
+                    "Combine Mips machine instrs before legalization", false,
+                    false)
+
+namespace llvm {
+FunctionPass *createMipsPreLegalizeCombiner() {
+  return new MipsPreLegalizerCombiner();
+}
+} // end namespace llvm