Add a new subtarget hook for whether or not we'd like to enable

[oota-llvm.git] / include / llvm / Target / TargetSubtargetInfo.h

diff --git a/include/llvm/Target/TargetSubtargetInfo.h b/include/llvm/Target/TargetSubtargetInfo.h
index af4cc1ed2b33be6f34c9506dbc6cde05b74510d4..83f1997bf20558a2a72e069b9cc1478a3dabef63 100644 (file)
--- a/include/llvm/Target/TargetSubtargetInfo.h
+++ b/include/llvm/Target/TargetSubtargetInfo.h
@@ -19,9 +19,13 @@
 
 namespace llvm {
 
+class MachineFunction;
+class MachineInstr;
 class SDep;
 class SUnit;
 class TargetRegisterClass;
+class TargetSchedModel;
+struct MachineSchedPolicy;
 template <typename T> class SmallVectorImpl;
 
 //===----------------------------------------------------------------------===//
@@ -31,8 +35,8 @@ template <typename T> class SmallVectorImpl;
 /// be exposed through a TargetSubtargetInfo-derived class.
 ///
 class TargetSubtargetInfo : public MCSubtargetInfo {
-  TargetSubtargetInfo(const TargetSubtargetInfo&);   // DO NOT IMPLEMENT
-  void operator=(const TargetSubtargetInfo&);  // DO NOT IMPLEMENT
+  TargetSubtargetInfo(const TargetSubtargetInfo&) LLVM_DELETED_FUNCTION;
+  void operator=(const TargetSubtargetInfo&) LLVM_DELETED_FUNCTION;
 protected: // Can only create subclasses...
   TargetSubtargetInfo();
 public:
@@ -43,11 +47,49 @@ public:
 
   virtual ~TargetSubtargetInfo();
 
-  /// getSpecialAddressLatency - For targets where it is beneficial to
-  /// backschedule instructions that compute addresses, return a value
-  /// indicating the number of scheduling cycles of backscheduling that
-  /// should be attempted.
-  virtual unsigned getSpecialAddressLatency() const { return 0; }
+  /// Resolve a SchedClass at runtime, where SchedClass identifies an
+  /// MCSchedClassDesc with the isVariant property. This may return the ID of
+  /// another variant SchedClass, but repeated invocation must quickly terminate
+  /// in a nonvariant SchedClass.
+  virtual unsigned resolveSchedClass(unsigned SchedClass, const MachineInstr *MI,
+                                     const TargetSchedModel* SchedModel) const {
+    return 0;
+  }
+
+  /// \brief Temporary API to test migration to MI scheduler.
+  bool useMachineScheduler() const;
+
+  /// \brief True if the subtarget should run MachineScheduler after aggressive
+  /// coalescing.
+  ///
+  /// This currently replaces the SelectionDAG scheduler with the "source" order
+  /// scheduler. It does not yet disable the postRA scheduler.
+  virtual bool enableMachineScheduler() const;
+
+  /// \brief True if the subtarget should run PostMachineScheduler.
+  ///
+  /// This only takes effect if the target has configured the
+  /// PostMachineScheduler pass to run, or if the global cl::opt flag,
+  /// MISchedPostRA, is set.
+  virtual bool enablePostMachineScheduler() const;
+
+  /// \brief True if the subtarget should run the atomic expansion pass.
+  virtual bool enableAtomicExpandLoadLinked() const;
+
+  /// \brief Override generic scheduling policy within a region.
+  ///
+  /// This is a convenient way for targets that don't provide any custom
+  /// scheduling heuristics (no custom MachineSchedStrategy) to make
+  /// changes to the generic scheduling policy.
+  virtual void overrideSchedPolicy(MachineSchedPolicy &Policy,
+                                   MachineInstr *begin,
+                                   MachineInstr *end,
+                                   unsigned NumRegionInstrs) const {}
+
+  // \brief Perform target specific adjustments to the latency of a schedule
+  // dependency.
+  virtual void adjustSchedDependency(SUnit *def, SUnit *use,
+                                     SDep& dep) const { }
 
   // enablePostRAScheduler - If the target can benefit from post-regalloc
   // scheduling and the specified optimization level meets the requirement
@@ -57,10 +99,16 @@ public:
   virtual bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
                                      AntiDepBreakMode& Mode,
                                      RegClassVector& CriticalPathRCs) const;
-  // adjustSchedDependency - Perform target specific adjustments to
-  // the latency of a schedule dependency.
-  virtual void adjustSchedDependency(SUnit *def, SUnit *use,
-                                     SDep& dep) const { }
+
+  /// \brief Enable use of alias analysis during code generation (during MI
+  /// scheduling, DAGCombine, etc.).
+  virtual bool useAA() const;
+
+  /// \brief Enable the use of the early if conversion pass.
+  virtual bool enableEarlyIfConversion() const { return false; }
+
+  /// \brief Reset the features for the subtarget.
+  virtual void resetSubtargetFeatures(const MachineFunction *MF) { }
 };
 
 } // End llvm namespace