68 lines
2.6 KiB
C++
68 lines
2.6 KiB
C++
//==-- llvm/Target/TargetSubtarget.h - Target Information --------*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file describes the subtarget options of a Target machine.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETSUBTARGET_H
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#define LLVM_TARGET_TARGETSUBTARGET_H
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class SDep;
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class SUnit;
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class TargetRegisterClass;
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template <typename T> class SmallVectorImpl;
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//===----------------------------------------------------------------------===//
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///
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/// TargetSubtarget - Generic base class for all target subtargets. All
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/// Target-specific options that control code generation and printing should
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/// be exposed through a TargetSubtarget-derived class.
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///
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class TargetSubtarget {
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TargetSubtarget(const TargetSubtarget&); // DO NOT IMPLEMENT
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void operator=(const TargetSubtarget&); // DO NOT IMPLEMENT
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protected: // Can only create subclasses...
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TargetSubtarget();
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public:
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// AntiDepBreakMode - Type of anti-dependence breaking that should
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// be performed before post-RA scheduling.
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typedef enum { ANTIDEP_NONE, ANTIDEP_CRITICAL, ANTIDEP_ALL } AntiDepBreakMode;
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typedef SmallVectorImpl<TargetRegisterClass*> RegClassVector;
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virtual ~TargetSubtarget();
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/// getSpecialAddressLatency - For targets where it is beneficial to
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/// backschedule instructions that compute addresses, return a value
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/// indicating the number of scheduling cycles of backscheduling that
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/// should be attempted.
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virtual unsigned getSpecialAddressLatency() const { return 0; }
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// enablePostRAScheduler - If the target can benefit from post-regalloc
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// scheduling and the specified optimization level meets the requirement
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// return true to enable post-register-allocation scheduling. In
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// CriticalPathRCs return any register classes that should only be broken
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// if on the critical path.
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virtual bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
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AntiDepBreakMode& Mode,
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RegClassVector& CriticalPathRCs) const;
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// adjustSchedDependency - Perform target specific adjustments to
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// the latency of a schedule dependency.
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virtual void adjustSchedDependency(SUnit *def, SUnit *use,
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SDep& dep) const { }
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};
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} // End llvm namespace
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#endif
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