TargetSchedModel interface. To be implemented...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163934 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/TargetSchedule.h

@@ -0,0 +1,63 @@
+//===-- llvm/CodeGen/TargetSchedule.h - Sched Machine Model -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a wrapper around MCSchedModel that allows the interface to
+// benefit from information currently only available in TargetInstrInfo.
+// Ideally, the scheduling interface would be fully defined in the MC layter.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TARGET_TARGETSCHEDMODEL_H
+#define LLVM_TARGET_TARGETSCHEDMODEL_H
+
+#include "llvm/MC/MCSchedule.h"
+#include "llvm/MC/MCInstrItineraries.h"
+
+namespace llvm {
+
+class TargetRegisterInfo;
+class TargetSubtargetInfo;
+class TargetInstrInfo;
+class MachineInstr;
+
+/// Provide an instruction scheduling machine model to CodeGen passes.
+class TargetSchedModel {
+  // For efficiency, hold a copy of the statically defined MCSchedModel for this
+  // processor.
+  MCSchedModel SchedModel;
+  InstrItineraryData InstrItins;
+  const TargetSubtargetInfo *STI;
+  const TargetInstrInfo *TII;
+public:
+  TargetSchedModel(): STI(0), TII(0) {}
+
+  void init(const MCSchedModel &sm, const TargetSubtargetInfo *sti,
+            const TargetInstrInfo *tii);
+
+  const TargetInstrInfo *getInstrInfo() const { return TII; }
+
+  /// Return true if this machine model includes an instruction-level scheduling
+  /// model. This is more detailed than the course grain IssueWidth and default
+  /// latency properties, but separate from the per-cycle itinerary data.
+  bool hasInstrSchedModel() const {
+    return SchedModel.hasInstrSchedModel();
+  }
+
+  /// Return true if this machine model includes cycle-to-cycle itinerary
+  /// data. This models scheduling at each stage in the processor pipeline.
+  bool hasInstrItineraries() const {
+    return SchedModel.hasInstrItineraries();
+  }
+
+  unsigned getProcessorID() const { return SchedModel.getProcessorID(); }
+};
+
+} // namespace llvm
+
+#endif