| //==-- llvm/Target/TargetSubtarget.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_TARGETSUBTARGET_H |
| #define LLVM_TARGET_TARGETSUBTARGET_H |
| |
| #include "llvm/Target/TargetMachine.h" |
| |
| namespace llvm { |
| |
| class SDep; |
| class SUnit; |
| class TargetRegisterClass; |
| template <typename T> class SmallVectorImpl; |
| |
| //===----------------------------------------------------------------------===// |
| /// |
| /// TargetSubtarget - Generic base class for all target subtargets. All |
| /// Target-specific options that control code generation and printing should |
| /// be exposed through a TargetSubtarget-derived class. |
| /// |
| class TargetSubtarget { |
| TargetSubtarget(const TargetSubtarget&); // DO NOT IMPLEMENT |
| void operator=(const TargetSubtarget&); // DO NOT IMPLEMENT |
| protected: // Can only create subclasses... |
| TargetSubtarget(); |
| 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<TargetRegisterClass*> RegClassVector; |
| |
| virtual ~TargetSubtarget(); |
| |
| /// 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; } |
| |
| // enablePostRAScheduler - If the target can benefit from post-regalloc |
| // scheduling and the specified optimization level meets the requirement |
| // return true to enable post-register-allocation scheduling. In |
| // CriticalPathRCs return any register classes that should only be broken |
| // if on the critical path. |
| 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 { } |
| }; |
| |
| } // End llvm namespace |
| |
| #endif |