Let's start another backend :)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75909 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/SystemZ/SystemZISelLowering.cpp

@@ -0,0 +1,72 @@
+//===-- SystemZISelLowering.cpp - SystemZ DAG Lowering Implementation  -----==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the SystemZTargetLowering class.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "systemz-lower"
+
+#include "SystemZISelLowering.h"
+#include "SystemZ.h"
+#include "SystemZTargetMachine.h"
+#include "SystemZSubtarget.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Function.h"
+#include "llvm/Intrinsics.h"
+#include "llvm/CallingConv.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/GlobalAlias.h"
+#include "llvm/CodeGen/CallingConvLower.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/PseudoSourceValue.h"
+#include "llvm/CodeGen/SelectionDAGISel.h"
+#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/ADT/VectorExtras.h"
+using namespace llvm;
+
+SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm) :
+  TargetLowering(tm), Subtarget(*tm.getSubtargetImpl()), TM(tm) {
+
+  // Set up the register classes.
+  addRegisterClass(MVT::i64, SystemZ::GR64RegisterClass);
+
+  // Compute derived properties from the register classes
+  computeRegisterProperties();
+
+  // Provide all sorts of operation actions
+
+  setStackPointerRegisterToSaveRestore(SystemZ::R15);
+  setSchedulingPreference(SchedulingForLatency);
+}
+
+SDValue SystemZTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
+  switch (Op.getOpcode()) {
+  default:
+    assert(0 && "unimplemented operand");
+    return SDValue();
+  }
+}
+
+//===----------------------------------------------------------------------===//
+//                      Calling Convention Implementation
+//===----------------------------------------------------------------------===//
+
+#include "SystemZGenCallingConv.inc"
+
+const char *SystemZTargetLowering::getTargetNodeName(unsigned Opcode) const {
+  switch (Opcode) {
+  default: return NULL;
+  }
+}
+