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Get the MispredictPenalty from MCSchedModel.
Thanks, Andy! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161507 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -31,6 +31,7 @@
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#include "llvm/CodeGen/MachineLoopInfo.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/MC/MCInstrItineraries.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/CommandLine.h"
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@ -513,6 +514,7 @@ namespace {
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class EarlyIfConverter : public MachineFunctionPass {
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class EarlyIfConverter : public MachineFunctionPass {
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const TargetInstrInfo *TII;
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const TargetInstrInfo *TII;
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const TargetRegisterInfo *TRI;
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const TargetRegisterInfo *TRI;
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const MCSchedModel *SchedModel;
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MachineRegisterInfo *MRI;
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MachineRegisterInfo *MRI;
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MachineDominatorTree *DomTree;
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MachineDominatorTree *DomTree;
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MachineLoopInfo *Loops;
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MachineLoopInfo *Loops;
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@ -602,9 +604,6 @@ bool EarlyIfConverter::shouldConvertIf() {
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if (!MinInstr)
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if (!MinInstr)
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MinInstr = Traces->getEnsemble(MachineTraceMetrics::TS_MinInstrCount);
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MinInstr = Traces->getEnsemble(MachineTraceMetrics::TS_MinInstrCount);
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// MCSchedModel doesn't yet provide a misprediction penalty.
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unsigned MispredictPenalty = 10;
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// Compare the critical path through TBB and FBB. If the difference is
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// Compare the critical path through TBB and FBB. If the difference is
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// greater than the branch misprediction penalty, it would never pay to
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// greater than the branch misprediction penalty, it would never pay to
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// if-convert. The triangle/diamond topology guarantees that these traces
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// if-convert. The triangle/diamond topology guarantees that these traces
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@ -615,8 +614,9 @@ bool EarlyIfConverter::shouldConvertIf() {
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unsigned TBBCrit = TBBTrace.getCriticalPath();
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unsigned TBBCrit = TBBTrace.getCriticalPath();
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unsigned FBBCrit = FBBTrace.getCriticalPath();
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unsigned FBBCrit = FBBTrace.getCriticalPath();
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unsigned ExtraCrit = TBBCrit > FBBCrit ? TBBCrit-FBBCrit : FBBCrit-TBBCrit;
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unsigned ExtraCrit = TBBCrit > FBBCrit ? TBBCrit-FBBCrit : FBBCrit-TBBCrit;
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if (ExtraCrit >= MispredictPenalty) {
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if (ExtraCrit >= SchedModel->MispredictPenalty) {
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DEBUG(dbgs() << "Critical path difference too large.\n");
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DEBUG(dbgs() << "Critical path difference larger than "
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<< SchedModel->MispredictPenalty << ".\n");
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return false;
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return false;
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}
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}
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return true;
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return true;
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@ -644,6 +644,7 @@ bool EarlyIfConverter::runOnMachineFunction(MachineFunction &MF) {
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<< ((Value*)MF.getFunction())->getName() << '\n');
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<< ((Value*)MF.getFunction())->getName() << '\n');
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TII = MF.getTarget().getInstrInfo();
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TII = MF.getTarget().getInstrInfo();
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TRI = MF.getTarget().getRegisterInfo();
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TRI = MF.getTarget().getRegisterInfo();
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SchedModel = MF.getTarget().getInstrItineraryData()->SchedModel;
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MRI = &MF.getRegInfo();
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MRI = &MF.getRegInfo();
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DomTree = &getAnalysis<MachineDominatorTree>();
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DomTree = &getAnalysis<MachineDominatorTree>();
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Loops = getAnalysisIfAvailable<MachineLoopInfo>();
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Loops = getAnalysisIfAvailable<MachineLoopInfo>();
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