TargetSubtargetInfo.cpp revision cd81d94322a39503e4a3e87b6ee03d4fcb3465fb
1//===-- TargetSubtargetInfo.cpp - General Target Information ---------------==// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file describes the general parts of a Subtarget. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/Support/CommandLine.h" 15#include "llvm/ADT/SmallVector.h" 16#include "llvm/Target/TargetSubtargetInfo.h" 17using namespace llvm; 18 19//--------------------------------------------------------------------------- 20// TargetSubtargetInfo Class 21// 22TargetSubtargetInfo::TargetSubtargetInfo() {} 23 24TargetSubtargetInfo::~TargetSubtargetInfo() {} 25 26// Temporary option to compare overall performance change when moving from the 27// SD scheduler to the MachineScheduler pass pipeline. This is convenient for 28// benchmarking during the transition from SD to MI scheduling. Once armv7 makes 29// the switch, it should go away. The normal way to enable/disable the 30// MachineScheduling pass itself is by using -enable-misched. For targets that 31// already use MI sched (via MySubTarget::enableMachineScheduler()) 32// -misched-bench=false negates the subtarget hook. 33static cl::opt<bool> BenchMachineSched("misched-bench", cl::Hidden, 34 cl::desc("Migrate from the target's default SD scheduler to MI scheduler")); 35 36bool TargetSubtargetInfo::useMachineScheduler() const { 37 if (BenchMachineSched.getNumOccurrences()) 38 return BenchMachineSched; 39 return enableMachineScheduler(); 40} 41 42bool TargetSubtargetInfo::enableAtomicExpandLoadLinked() const { 43 return true; 44} 45 46bool TargetSubtargetInfo::enableMachineScheduler() const { 47 return false; 48} 49 50bool TargetSubtargetInfo::enableRALocalReassignment( 51 CodeGenOpt::Level OptLevel) const { 52 return true; 53} 54 55bool TargetSubtargetInfo::enablePostMachineScheduler() const { 56 return false; 57} 58 59bool TargetSubtargetInfo::enablePostRAScheduler( 60 CodeGenOpt::Level OptLevel, 61 AntiDepBreakMode& Mode, 62 RegClassVector& CriticalPathRCs) const { 63 Mode = ANTIDEP_NONE; 64 CriticalPathRCs.clear(); 65 return false; 66} 67 68bool TargetSubtargetInfo::useAA() const { 69 return false; 70} 71