llvm-6502/include/llvm/Target/TargetSubtargetInfo.h
2011-07-01 21:01:15 +00:00

69 lines
2.7 KiB
C++

//==-- 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/Target/TargetMachine.h"
namespace llvm {
class SDep;
class SUnit;
class TargetRegisterClass;
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&); // DO NOT IMPLEMENT
void operator=(const TargetSubtargetInfo&); // DO NOT IMPLEMENT
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<TargetRegisterClass*> RegClassVector;
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; }
// 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