//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "regalloc"
-#include "VirtRegMap.h"
-#include "llvm/ADT/SetVector.h"
+#include "llvm/CodeGen/LiveRangeEdit.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/CalcSpillWeights.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
-#include "llvm/CodeGen/LiveRangeEdit.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/CodeGen/VirtRegMap.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetInstrInfo.h"
using namespace llvm;
void LiveRangeEdit::Delegate::anchor() { }
-LiveInterval &LiveRangeEdit::createFrom(unsigned OldReg) {
+LiveInterval &LiveRangeEdit::createEmptyIntervalFrom(unsigned OldReg) {
unsigned VReg = MRI.createVirtualRegister(MRI.getRegClass(OldReg));
if (VRM) {
- VRM->grow();
VRM->setIsSplitFromReg(VReg, VRM->getOriginal(OldReg));
}
- LiveInterval &LI = LIS.getOrCreateInterval(VReg);
- NewRegs.push_back(&LI);
+ LiveInterval &LI = LIS.createEmptyInterval(VReg);
return LI;
}
+unsigned LiveRangeEdit::createFrom(unsigned OldReg) {
+ unsigned VReg = MRI.createVirtualRegister(MRI.getRegClass(OldReg));
+ if (VRM) {
+ VRM->setIsSplitFromReg(VReg, VRM->getOriginal(OldReg));
+ }
+ return VReg;
+}
+
bool LiveRangeEdit::checkRematerializable(VNInfo *VNI,
const MachineInstr *DefMI,
AliasAnalysis *aa) {
/// OrigIdx are also available with the same value at UseIdx.
bool LiveRangeEdit::allUsesAvailableAt(const MachineInstr *OrigMI,
SlotIndex OrigIdx,
- SlotIndex UseIdx) {
+ SlotIndex UseIdx) const {
OrigIdx = OrigIdx.getRegSlot(true);
UseIdx = UseIdx.getRegSlot(true);
for (unsigned i = 0, e = OrigMI->getNumOperands(); i != e; ++i) {
// We can't remat physreg uses, unless it is a constant.
if (TargetRegisterInfo::isPhysicalRegister(MO.getReg())) {
- if (MRI.isConstantPhysReg(MO.getReg(), VRM->getMachineFunction()))
+ if (MRI.isConstantPhysReg(MO.getReg(), *OrigMI->getParent()->getParent()))
continue;
return false;
}
const VNInfo *OVNI = li.getVNInfoAt(OrigIdx);
if (!OVNI)
continue;
+
+ // Don't allow rematerialization immediately after the original def.
+ // It would be incorrect if OrigMI redefines the register.
+ // See PR14098.
+ if (SlotIndex::isSameInstr(OrigIdx, UseIdx))
+ return false;
+
if (OVNI != li.getVNInfoAt(UseIdx))
return false;
}
if (!DefMI || !UseMI)
return false;
+ // Since we're moving the DefMI load, make sure we're not extending any live
+ // ranges.
+ if (!allUsesAvailableAt(DefMI,
+ LIS.getInstructionIndex(DefMI),
+ LIS.getInstructionIndex(UseMI)))
+ return false;
+
+ // We also need to make sure it is safe to move the load.
+ // Assume there are stores between DefMI and UseMI.
+ bool SawStore = true;
+ if (!DefMI->isSafeToMove(&TII, 0, SawStore))
+ return false;
+
DEBUG(dbgs() << "Try to fold single def: " << *DefMI
<< " into single use: " << *UseMI);
return true;
}
-void LiveRangeEdit::eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead,
- ArrayRef<unsigned> RegsBeingSpilled) {
- SetVector<LiveInterval*,
- SmallVector<LiveInterval*, 8>,
- SmallPtrSet<LiveInterval*, 8> > ToShrink;
+/// Find all live intervals that need to shrink, then remove the instruction.
+void LiveRangeEdit::eliminateDeadDef(MachineInstr *MI, ToShrinkSet &ToShrink) {
+ assert(MI->allDefsAreDead() && "Def isn't really dead");
+ SlotIndex Idx = LIS.getInstructionIndex(MI).getRegSlot();
- for (;;) {
- // Erase all dead defs.
- while (!Dead.empty()) {
- MachineInstr *MI = Dead.pop_back_val();
- assert(MI->allDefsAreDead() && "Def isn't really dead");
- SlotIndex Idx = LIS.getInstructionIndex(MI).getRegSlot();
-
- // Never delete inline asm.
- if (MI->isInlineAsm()) {
- DEBUG(dbgs() << "Won't delete: " << Idx << '\t' << *MI);
- continue;
- }
+ // Never delete a bundled instruction.
+ if (MI->isBundled()) {
+ return;
+ }
+ // Never delete inline asm.
+ if (MI->isInlineAsm()) {
+ DEBUG(dbgs() << "Won't delete: " << Idx << '\t' << *MI);
+ return;
+ }
- // Use the same criteria as DeadMachineInstructionElim.
- bool SawStore = false;
- if (!MI->isSafeToMove(&TII, 0, SawStore)) {
- DEBUG(dbgs() << "Can't delete: " << Idx << '\t' << *MI);
- continue;
- }
+ // Use the same criteria as DeadMachineInstructionElim.
+ bool SawStore = false;
+ if (!MI->isSafeToMove(&TII, 0, SawStore)) {
+ DEBUG(dbgs() << "Can't delete: " << Idx << '\t' << *MI);
+ return;
+ }
+
+ DEBUG(dbgs() << "Deleting dead def " << Idx << '\t' << *MI);
- DEBUG(dbgs() << "Deleting dead def " << Idx << '\t' << *MI);
-
- // Collect virtual registers to be erased after MI is gone.
- SmallVector<unsigned, 8> RegsToErase;
-
- // Check for live intervals that may shrink
- for (MachineInstr::mop_iterator MOI = MI->operands_begin(),
- MOE = MI->operands_end(); MOI != MOE; ++MOI) {
- if (!MOI->isReg())
- continue;
- unsigned Reg = MOI->getReg();
- if (!TargetRegisterInfo::isVirtualRegister(Reg))
- continue;
- LiveInterval &LI = LIS.getInterval(Reg);
-
- // Shrink read registers, unless it is likely to be expensive and
- // unlikely to change anything. We typically don't want to shrink the
- // PIC base register that has lots of uses everywhere.
- // Always shrink COPY uses that probably come from live range splitting.
- if (MI->readsVirtualRegister(Reg) &&
- (MI->isCopy() || MOI->isDef() || MRI.hasOneNonDBGUse(Reg) ||
- LI.killedAt(Idx)))
- ToShrink.insert(&LI);
-
- // Remove defined value.
- if (MOI->isDef()) {
- if (VNInfo *VNI = LI.getVNInfoAt(Idx)) {
- if (TheDelegate)
- TheDelegate->LRE_WillShrinkVirtReg(LI.reg);
- LI.removeValNo(VNI);
- if (LI.empty())
- RegsToErase.push_back(Reg);
+ // Collect virtual registers to be erased after MI is gone.
+ SmallVector<unsigned, 8> RegsToErase;
+ bool ReadsPhysRegs = false;
+
+ // Check for live intervals that may shrink
+ for (MachineInstr::mop_iterator MOI = MI->operands_begin(),
+ MOE = MI->operands_end(); MOI != MOE; ++MOI) {
+ if (!MOI->isReg())
+ continue;
+ unsigned Reg = MOI->getReg();
+ if (!TargetRegisterInfo::isVirtualRegister(Reg)) {
+ // Check if MI reads any unreserved physregs.
+ if (Reg && MOI->readsReg() && !MRI.isReserved(Reg))
+ ReadsPhysRegs = true;
+ else if (MOI->isDef()) {
+ for (MCRegUnitIterator Units(Reg, MRI.getTargetRegisterInfo());
+ Units.isValid(); ++Units) {
+ if (LiveRange *LR = LIS.getCachedRegUnit(*Units)) {
+ if (VNInfo *VNI = LR->getVNInfoAt(Idx))
+ LR->removeValNo(VNI);
}
}
}
-
- if (TheDelegate)
- TheDelegate->LRE_WillEraseInstruction(MI);
- LIS.RemoveMachineInstrFromMaps(MI);
- MI->eraseFromParent();
- ++NumDCEDeleted;
-
- // Erase any virtregs that are now empty and unused. There may be <undef>
- // uses around. Keep the empty live range in that case.
- for (unsigned i = 0, e = RegsToErase.size(); i != e; ++i) {
- unsigned Reg = RegsToErase[i];
- if (LIS.hasInterval(Reg) && MRI.reg_nodbg_empty(Reg)) {
- ToShrink.remove(&LIS.getInterval(Reg));
- eraseVirtReg(Reg);
- }
+ continue;
+ }
+ LiveInterval &LI = LIS.getInterval(Reg);
+
+ // Shrink read registers, unless it is likely to be expensive and
+ // unlikely to change anything. We typically don't want to shrink the
+ // PIC base register that has lots of uses everywhere.
+ // Always shrink COPY uses that probably come from live range splitting.
+ if (MI->readsVirtualRegister(Reg) &&
+ (MI->isCopy() || MOI->isDef() || MRI.hasOneNonDBGUse(Reg) ||
+ LI.Query(Idx).isKill()))
+ ToShrink.insert(&LI);
+
+ // Remove defined value.
+ if (MOI->isDef()) {
+ if (VNInfo *VNI = LI.getVNInfoAt(Idx)) {
+ if (TheDelegate)
+ TheDelegate->LRE_WillShrinkVirtReg(LI.reg);
+ LI.removeValNo(VNI);
+ if (LI.empty())
+ RegsToErase.push_back(Reg);
}
}
+ }
+
+ // Currently, we don't support DCE of physreg live ranges. If MI reads
+ // any unreserved physregs, don't erase the instruction, but turn it into
+ // a KILL instead. This way, the physreg live ranges don't end up
+ // dangling.
+ // FIXME: It would be better to have something like shrinkToUses() for
+ // physregs. That could potentially enable more DCE and it would free up
+ // the physreg. It would not happen often, though.
+ if (ReadsPhysRegs) {
+ MI->setDesc(TII.get(TargetOpcode::KILL));
+ // Remove all operands that aren't physregs.
+ for (unsigned i = MI->getNumOperands(); i; --i) {
+ const MachineOperand &MO = MI->getOperand(i-1);
+ if (MO.isReg() && TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
+ continue;
+ MI->RemoveOperand(i-1);
+ }
+ DEBUG(dbgs() << "Converted physregs to:\t" << *MI);
+ } else {
+ if (TheDelegate)
+ TheDelegate->LRE_WillEraseInstruction(MI);
+ LIS.RemoveMachineInstrFromMaps(MI);
+ MI->eraseFromParent();
+ ++NumDCEDeleted;
+ }
+
+ // Erase any virtregs that are now empty and unused. There may be <undef>
+ // uses around. Keep the empty live range in that case.
+ for (unsigned i = 0, e = RegsToErase.size(); i != e; ++i) {
+ unsigned Reg = RegsToErase[i];
+ if (LIS.hasInterval(Reg) && MRI.reg_nodbg_empty(Reg)) {
+ ToShrink.remove(&LIS.getInterval(Reg));
+ eraseVirtReg(Reg);
+ }
+ }
+}
+
+void LiveRangeEdit::eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead,
+ ArrayRef<unsigned> RegsBeingSpilled) {
+ ToShrinkSet ToShrink;
+
+ for (;;) {
+ // Erase all dead defs.
+ while (!Dead.empty())
+ eliminateDeadDef(Dead.pop_back_val(), ToShrink);
if (ToShrink.empty())
break;
TheDelegate->LRE_WillShrinkVirtReg(LI->reg);
if (!LIS.shrinkToUses(LI, &Dead))
continue;
-
+
// Don't create new intervals for a register being spilled.
// The new intervals would have to be spilled anyway so its not worth it.
// Also they currently aren't spilled so creating them and not spilling
break;
}
}
-
+
if (BeingSpilled) continue;
// LI may have been separated, create new intervals.
- LI->RenumberValues(LIS);
+ LI->RenumberValues();
ConnectedVNInfoEqClasses ConEQ(LIS);
unsigned NumComp = ConEQ.Classify(LI);
if (NumComp <= 1)
DEBUG(dbgs() << NumComp << " components: " << *LI << '\n');
SmallVector<LiveInterval*, 8> Dups(1, LI);
for (unsigned i = 1; i != NumComp; ++i) {
- Dups.push_back(&createFrom(LI->reg));
+ Dups.push_back(&createEmptyIntervalFrom(LI->reg));
// If LI is an original interval that hasn't been split yet, make the new
// intervals their own originals instead of referring to LI. The original
// interval must contain all the split products, and LI doesn't.
}
}
-void LiveRangeEdit::calculateRegClassAndHint(MachineFunction &MF,
- const MachineLoopInfo &Loops) {
- VirtRegAuxInfo VRAI(MF, LIS, Loops);
- for (iterator I = begin(), E = end(); I != E; ++I) {
- LiveInterval &LI = **I;
+// Keep track of new virtual registers created via
+// MachineRegisterInfo::createVirtualRegister.
+void
+LiveRangeEdit::MRI_NoteNewVirtualRegister(unsigned VReg)
+{
+ if (VRM)
+ VRM->grow();
+
+ NewRegs.push_back(VReg);
+}
+
+void
+LiveRangeEdit::calculateRegClassAndHint(MachineFunction &MF,
+ const MachineLoopInfo &Loops,
+ const MachineBlockFrequencyInfo &MBFI) {
+ VirtRegAuxInfo VRAI(MF, LIS, Loops, MBFI);
+ for (unsigned I = 0, Size = size(); I < Size; ++I) {
+ LiveInterval &LI = LIS.getInterval(get(I));
if (MRI.recomputeRegClass(LI.reg, MF.getTarget()))
DEBUG(dbgs() << "Inflated " << PrintReg(LI.reg) << " to "
<< MRI.getRegClass(LI.reg)->getName() << '\n');
- VRAI.CalculateWeightAndHint(LI);
+ VRAI.calculateSpillWeightAndHint(LI);
}
}
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