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//==-- 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
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