| //==-- llvm/Target/TargetSubtargetInfo.h - Target Information ----*- C++ -*-==// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file describes the subtarget options of a Target machine. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_TARGET_TARGETSUBTARGETINFO_H |
| #define LLVM_TARGET_TARGETSUBTARGETINFO_H |
| |
| #include "llvm/MC/MCSubtargetInfo.h" |
| #include "llvm/Support/CodeGen.h" |
| |
| namespace llvm { |
| |
| class MachineFunction; |
| class MachineInstr; |
| class SDep; |
| class SUnit; |
| class TargetRegisterClass; |
| class TargetSchedModel; |
| struct MachineSchedPolicy; |
| template <typename T> class SmallVectorImpl; |
| |
| //===----------------------------------------------------------------------===// |
| /// |
| /// TargetSubtargetInfo - Generic base class for all target subtargets. All |
| /// Target-specific options that control code generation and printing should |
| /// be exposed through a TargetSubtargetInfo-derived class. |
| /// |
| class TargetSubtargetInfo : public MCSubtargetInfo { |
| TargetSubtargetInfo(const TargetSubtargetInfo&) LLVM_DELETED_FUNCTION; |
| void operator=(const TargetSubtargetInfo&) LLVM_DELETED_FUNCTION; |
| protected: // Can only create subclasses... |
| TargetSubtargetInfo(); |
| public: |
| // AntiDepBreakMode - Type of anti-dependence breaking that should |
| // be performed before post-RA scheduling. |
| typedef enum { ANTIDEP_NONE, ANTIDEP_CRITICAL, ANTIDEP_ALL } AntiDepBreakMode; |
| typedef SmallVectorImpl<const TargetRegisterClass*> RegClassVector; |
| |
| virtual ~TargetSubtargetInfo(); |
| |
| /// 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 { } |
| |
| // For use with PostRAScheduling: get the anti-dependence breaking that should |
| // be performed before post-RA scheduling. |
| virtual AntiDepBreakMode getAntiDepBreakMode() const { |
| return ANTIDEP_NONE; |
| } |
| |
| // For use with PostRAScheduling: in CriticalPathRCs, return any register |
| // classes that should only be considered for anti-dependence breaking if they |
| // are on the critical path. |
| virtual void getCriticalPathRCs(RegClassVector &CriticalPathRCs) const { |
| return CriticalPathRCs.clear(); |
| } |
| |
| // For use with PostRAScheduling: get the minimum optimization level needed |
| // to enable post-RA scheduling. |
| virtual CodeGenOpt::Level getOptLevelToEnablePostRAScheduler() const { |
| return CodeGenOpt::Default; |
| } |
| |
| /// \brief True if the subtarget should run the local reassignment |
| /// heuristic of the register allocator. |
| /// This heuristic may be compile time intensive, \p OptLevel provides |
| /// a finer grain to tune the register allocator. |
| virtual bool enableRALocalReassignment(CodeGenOpt::Level OptLevel) 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 |
| |
| #endif |