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343f0c0467
is currently off by default, and can be enabled with -disable-post-RA-scheduler=false. This doesn't have a significant impact on most code yet because it doesn't yet do anything to address anti-dependencies and it doesn't attempt to disambiguate memory references. Also, several popular targets don't have pipeline descriptions yet. The majority of the changes here are splitting the SelectionDAG-specific code out of ScheduleDAG, so that ScheduleDAG can be moved to libLLVMCodeGen.a. The interface between ScheduleDAG-using code and the rest of the scheduling code is somewhat rough and will evolve. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59676 91177308-0d34-0410-b5e6-96231b3b80d8
73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
//===---- ScheduleDAGEmit.cpp - Emit routines for the ScheduleDAG class ---===//
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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 implements the Emit routines for the ScheduleDAG class, which creates
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// MachineInstrs according to the computed schedule.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "pre-RA-sched"
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#include "llvm/CodeGen/ScheduleDAG.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/MathExtras.h"
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using namespace llvm;
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void ScheduleDAG::AddMemOperand(MachineInstr *MI, const MachineMemOperand &MO) {
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MI->addMemOperand(*MF, MO);
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}
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void ScheduleDAG::EmitNoop() {
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TII->insertNoop(*BB, BB->end());
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}
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void ScheduleDAG::EmitCrossRCCopy(SUnit *SU,
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DenseMap<SUnit*, unsigned> &VRBaseMap) {
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for (SUnit::const_pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
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I != E; ++I) {
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if (I->isCtrl) continue; // ignore chain preds
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if (I->Dep->CopyDstRC) {
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// Copy to physical register.
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DenseMap<SUnit*, unsigned>::iterator VRI = VRBaseMap.find(I->Dep);
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assert(VRI != VRBaseMap.end() && "Node emitted out of order - late");
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// Find the destination physical register.
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unsigned Reg = 0;
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for (SUnit::const_succ_iterator II = SU->Succs.begin(),
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EE = SU->Succs.end(); II != EE; ++II) {
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if (I->Reg) {
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Reg = I->Reg;
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break;
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}
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}
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assert(I->Reg && "Unknown physical register!");
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TII->copyRegToReg(*BB, BB->end(), Reg, VRI->second,
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SU->CopyDstRC, SU->CopySrcRC);
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} else {
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// Copy from physical register.
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assert(I->Reg && "Unknown physical register!");
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unsigned VRBase = MRI.createVirtualRegister(SU->CopyDstRC);
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bool isNew = VRBaseMap.insert(std::make_pair(SU, VRBase)).second;
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isNew = isNew; // Silence compiler warning.
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assert(isNew && "Node emitted out of order - early");
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TII->copyRegToReg(*BB, BB->end(), VRBase, I->Reg,
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SU->CopyDstRC, SU->CopySrcRC);
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}
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break;
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}
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}
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