1 files changed, 79 insertions, 0 deletions
diff --git a/llvm/lib/Target/Nios2/Nios2ISelDAGToDAG.cpp b/llvm/lib/Target/Nios2/Nios2ISelDAGToDAG.cpp
new file mode 100644
index 00000000000..31d04ebe447
--- /dev/null
+++ b/llvm/lib/Target/Nios2/Nios2ISelDAGToDAG.cpp
@@ -0,0 +1,79 @@
+//===-- Nios2ISelDAGToDAG.cpp - A Dag to Dag Inst Selector for Nios2 ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an instruction selector for the NIOS2 target.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Nios2.h"
+#include "Nios2TargetMachine.h"
+#include "llvm/CodeGen/SelectionDAGISel.h"
+#include "llvm/Support/Debug.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "nios2-isel"
+
+//===----------------------------------------------------------------------===//
+// Instruction Selector Implementation
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Nios2DAGToDAGISel - NIOS2 specific code to select NIOS2 machine
+// instructions for SelectionDAG operations.
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+class Nios2DAGToDAGISel : public SelectionDAGISel {
+  /// Subtarget - Keep a pointer to the Nios2 Subtarget around so that we can
+  /// make the right decision when generating code for different targets.
+  const Nios2Subtarget *Subtarget;
+
+public:
+  explicit Nios2DAGToDAGISel(Nios2TargetMachine &TM, CodeGenOpt::Level OL)
+      : SelectionDAGISel(TM, OL) {}
+
+  bool runOnMachineFunction(MachineFunction &MF) override {
+    Subtarget = &MF.getSubtarget<Nios2Subtarget>();
+    return SelectionDAGISel::runOnMachineFunction(MF);
+  }
+
+  void Select(SDNode *N) override;
+
+  // Pass Name
+  StringRef getPassName() const override {
+    return "NIOS2 DAG->DAG Pattern Instruction Selection";
+  }
+
+#include "Nios2GenDAGISel.inc"
+};
+} // namespace
+
+// Select instructions not customized! Used for
+// expanded, promoted and normal instructions
+void Nios2DAGToDAGISel::Select(SDNode *Node) {
+
+  // Dump information about the Node being selected
+  DEBUG(errs() << "Selecting: "; Node->dump(CurDAG); errs() << "\n");
+
+  // If we have a custom node, we already have selected!
+  if (Node->isMachineOpcode()) {
+    DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n");
+    Node->setNodeId(-1);
+    return;
+  }
+
+  // Select the default instruction
+  SelectCode(Node);
+}
+
+FunctionPass *llvm::createNios2ISelDag(Nios2TargetMachine &TM,
+                                       CodeGenOpt::Level OptLevel) {
+  return new Nios2DAGToDAGISel(TM, OptLevel);
+}