1 //==-- llvm/Target/TargetSubtarget.h - Target Information --------*- C++ -*-==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file describes the subtarget options of a Target machine.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_TARGET_TARGETSUBTARGET_H
15 #define LLVM_TARGET_TARGETSUBTARGET_H
21 //===----------------------------------------------------------------------===//
23 /// TargetSubtarget - Generic base class for all target subtargets. All
24 /// Target-specific options that control code generation and printing should
25 /// be exposed through a TargetSubtarget-derived class.
27 class TargetSubtarget {
28 TargetSubtarget(const TargetSubtarget&); // DO NOT IMPLEMENT
29 void operator=(const TargetSubtarget&); // DO NOT IMPLEMENT
30 protected: // Can only create subclasses...
33 virtual ~TargetSubtarget();
35 /// getSpecialAddressLatency - For targets where it is beneficial to
36 /// backschedule instructions that compute addresses, return a value
37 /// indicating the number of scheduling cycles of backscheduling that
38 /// should be attempted.
39 virtual unsigned getSpecialAddressLatency() const { return 0; }
41 // adjustSchedDependency - Perform target specific adjustments to
42 // the latency of a schedule dependency.
43 virtual void adjustSchedDependency(SDep&) const { };
46 } // End llvm namespace