#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/CodeGen/PostRAHazardRecognizer.h"
+#include "llvm/CodeGen/ScoreboardHazardRecognizer.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
+#include "llvm/MC/MCInstrItineraries.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
+static cl::opt<bool> DisableHazardRecognizer(
+ "disable-sched-hazard", cl::Hidden, cl::init(false),
+ cl::desc("Disable hazard detection during preRA scheduling"));
+
/// ReplaceTailWithBranchTo - Delete the instruction OldInst and everything
/// after it, replacing it with an unconditional branch to NewDest.
void
// the two operands returned by findCommutedOpIndices.
MachineInstr *TargetInstrInfoImpl::commuteInstruction(MachineInstr *MI,
bool NewMI) const {
- const TargetInstrDesc &TID = MI->getDesc();
- bool HasDef = TID.getNumDefs();
+ const MCInstrDesc &MCID = MI->getDesc();
+ bool HasDef = MCID.getNumDefs();
if (HasDef && !MI->getOperand(0).isReg())
// No idea how to commute this instruction. Target should implement its own.
return 0;
assert(MI->getOperand(Idx1).isReg() && MI->getOperand(Idx2).isReg() &&
"This only knows how to commute register operands so far");
+ unsigned Reg0 = HasDef ? MI->getOperand(0).getReg() : 0;
unsigned Reg1 = MI->getOperand(Idx1).getReg();
unsigned Reg2 = MI->getOperand(Idx2).getReg();
bool Reg1IsKill = MI->getOperand(Idx1).isKill();
bool Reg2IsKill = MI->getOperand(Idx2).isKill();
- bool ChangeReg0 = false;
- if (HasDef && MI->getOperand(0).getReg() == Reg1) {
- // Must be two address instruction!
- assert(MI->getDesc().getOperandConstraint(0, TOI::TIED_TO) &&
- "Expecting a two-address instruction!");
+ // If destination is tied to either of the commuted source register, then
+ // it must be updated.
+ if (HasDef && Reg0 == Reg1 &&
+ MI->getDesc().getOperandConstraint(Idx1, MCOI::TIED_TO) == 0) {
Reg2IsKill = false;
- ChangeReg0 = true;
+ Reg0 = Reg2;
+ } else if (HasDef && Reg0 == Reg2 &&
+ MI->getDesc().getOperandConstraint(Idx2, MCOI::TIED_TO) == 0) {
+ Reg1IsKill = false;
+ Reg0 = Reg1;
}
if (NewMI) {
// Create a new instruction.
- unsigned Reg0 = HasDef
- ? (ChangeReg0 ? Reg2 : MI->getOperand(0).getReg()) : 0;
bool Reg0IsDead = HasDef ? MI->getOperand(0).isDead() : false;
MachineFunction &MF = *MI->getParent()->getParent();
if (HasDef)
.addReg(Reg1, getKillRegState(Reg2IsKill));
}
- if (ChangeReg0)
- MI->getOperand(0).setReg(Reg2);
+ if (HasDef)
+ MI->getOperand(0).setReg(Reg0);
MI->getOperand(Idx2).setReg(Reg1);
MI->getOperand(Idx1).setReg(Reg2);
MI->getOperand(Idx2).setIsKill(Reg1IsKill);
bool TargetInstrInfoImpl::findCommutedOpIndices(MachineInstr *MI,
unsigned &SrcOpIdx1,
unsigned &SrcOpIdx2) const {
- const TargetInstrDesc &TID = MI->getDesc();
- if (!TID.isCommutable())
+ assert(!MI->isBundle() &&
+ "TargetInstrInfoImpl::findCommutedOpIndices() can't handle bundles");
+
+ const MCInstrDesc &MCID = MI->getDesc();
+ if (!MCID.isCommutable())
return false;
// This assumes v0 = op v1, v2 and commuting would swap v1 and v2. If this
// is not true, then the target must implement this.
- SrcOpIdx1 = TID.getNumDefs();
+ SrcOpIdx1 = MCID.getNumDefs();
SrcOpIdx2 = SrcOpIdx1 + 1;
if (!MI->getOperand(SrcOpIdx1).isReg() ||
!MI->getOperand(SrcOpIdx2).isReg())
}
+bool
+TargetInstrInfoImpl::isUnpredicatedTerminator(const MachineInstr *MI) const {
+ if (!MI->isTerminator()) return false;
+
+ // Conditional branch is a special case.
+ if (MI->isBranch() && !MI->isBarrier())
+ return true;
+ if (!MI->isPredicable())
+ return true;
+ return !isPredicated(MI);
+}
+
+
bool TargetInstrInfoImpl::PredicateInstruction(MachineInstr *MI,
const SmallVectorImpl<MachineOperand> &Pred) const {
bool MadeChange = false;
- const TargetInstrDesc &TID = MI->getDesc();
- if (!TID.isPredicable())
+
+ assert(!MI->isBundle() &&
+ "TargetInstrInfoImpl::PredicateInstruction() can't handle bundles");
+
+ const MCInstrDesc &MCID = MI->getDesc();
+ if (!MI->isPredicable())
return false;
-
+
for (unsigned j = 0, i = 0, e = MI->getNumOperands(); i != e; ++i) {
- if (TID.OpInfo[i].isPredicate()) {
+ if (MCID.OpInfo[i].isPredicate()) {
MachineOperand &MO = MI->getOperand(i);
if (MO.isReg()) {
MO.setReg(Pred[j].getReg());
return MadeChange;
}
+bool TargetInstrInfoImpl::hasLoadFromStackSlot(const MachineInstr *MI,
+ const MachineMemOperand *&MMO,
+ int &FrameIndex) const {
+ for (MachineInstr::mmo_iterator o = MI->memoperands_begin(),
+ oe = MI->memoperands_end();
+ o != oe;
+ ++o) {
+ if ((*o)->isLoad() && (*o)->getValue())
+ if (const FixedStackPseudoSourceValue *Value =
+ dyn_cast<const FixedStackPseudoSourceValue>((*o)->getValue())) {
+ FrameIndex = Value->getFrameIndex();
+ MMO = *o;
+ return true;
+ }
+ }
+ return false;
+}
+
+bool TargetInstrInfoImpl::hasStoreToStackSlot(const MachineInstr *MI,
+ const MachineMemOperand *&MMO,
+ int &FrameIndex) const {
+ for (MachineInstr::mmo_iterator o = MI->memoperands_begin(),
+ oe = MI->memoperands_end();
+ o != oe;
+ ++o) {
+ if ((*o)->isStore() && (*o)->getValue())
+ if (const FixedStackPseudoSourceValue *Value =
+ dyn_cast<const FixedStackPseudoSourceValue>((*o)->getValue())) {
+ FrameIndex = Value->getFrameIndex();
+ MMO = *o;
+ return true;
+ }
+ }
+ return false;
+}
+
void TargetInstrInfoImpl::reMaterialize(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned DestReg,
MBB.insert(I, MI);
}
-bool TargetInstrInfoImpl::produceSameValue(const MachineInstr *MI0,
- const MachineInstr *MI1) const {
+bool
+TargetInstrInfoImpl::produceSameValue(const MachineInstr *MI0,
+ const MachineInstr *MI1,
+ const MachineRegisterInfo *MRI) const {
return MI0->isIdenticalTo(MI1, MachineInstr::IgnoreVRegDefs);
}
MachineInstr *TargetInstrInfoImpl::duplicate(MachineInstr *Orig,
MachineFunction &MF) const {
- assert(!Orig->getDesc().isNotDuplicable() &&
+ assert(!Orig->isNotDuplicable() &&
"Instruction cannot be duplicated");
return MF.CloneMachineInstr(Orig);
}
if (TargetRegisterInfo::isPhysicalRegister(LiveOp.getReg()))
return RC->contains(LiveOp.getReg()) ? RC : 0;
- const TargetRegisterClass *LiveRC = MRI.getRegClass(LiveReg);
- if (RC == LiveRC || RC->hasSubClass(LiveRC))
+ if (RC->hasSubClassEq(MRI.getRegClass(LiveReg)))
return RC;
// FIXME: Allow folding when register classes are memory compatible.
if (MachineInstr *NewMI = foldMemoryOperandImpl(MF, MI, Ops, FI)) {
// Add a memory operand, foldMemoryOperandImpl doesn't do that.
assert((!(Flags & MachineMemOperand::MOStore) ||
- NewMI->getDesc().mayStore()) &&
+ NewMI->mayStore()) &&
"Folded a def to a non-store!");
assert((!(Flags & MachineMemOperand::MOLoad) ||
- NewMI->getDesc().mayLoad()) &&
+ NewMI->mayLoad()) &&
"Folded a use to a non-load!");
const MachineFrameInfo &MFI = *MF.getFrameInfo();
assert(MFI.getObjectOffset(FI) != -1);
MachineMemOperand *MMO =
- MF.getMachineMemOperand(PseudoSourceValue::getFixedStack(FI),
- Flags, /*Offset=*/0,
- MFI.getObjectSize(FI),
+ MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
+ Flags, MFI.getObjectSize(FI),
MFI.getObjectAlignment(FI));
NewMI->addMemOperand(MF, MMO);
TargetInstrInfo::foldMemoryOperand(MachineBasicBlock::iterator MI,
const SmallVectorImpl<unsigned> &Ops,
MachineInstr* LoadMI) const {
- assert(LoadMI->getDesc().canFoldAsLoad() && "LoadMI isn't foldable!");
+ assert(LoadMI->canFoldAsLoad() && "LoadMI isn't foldable!");
#ifndef NDEBUG
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
assert(MI->getOperand(Ops[i]).isUse() && "Folding load into def!");
const TargetInstrInfo &TII = *TM.getInstrInfo();
const TargetRegisterInfo &TRI = *TM.getRegisterInfo();
+ // Remat clients assume operand 0 is the defined register.
+ if (!MI->getNumOperands() || !MI->getOperand(0).isReg())
+ return false;
+ unsigned DefReg = MI->getOperand(0).getReg();
+
+ // A sub-register definition can only be rematerialized if the instruction
+ // doesn't read the other parts of the register. Otherwise it is really a
+ // read-modify-write operation on the full virtual register which cannot be
+ // moved safely.
+ if (TargetRegisterInfo::isVirtualRegister(DefReg) &&
+ MI->getOperand(0).getSubReg() && MI->readsVirtualRegister(DefReg))
+ return false;
+
// A load from a fixed stack slot can be rematerialized. This may be
// redundant with subsequent checks, but it's target-independent,
// simple, and a common case.
MF.getFrameInfo()->isImmutableObjectIndex(FrameIdx))
return true;
- const TargetInstrDesc &TID = MI->getDesc();
-
// Avoid instructions obviously unsafe for remat.
- if (TID.hasUnmodeledSideEffects() || TID.isNotDuplicable() ||
- TID.mayStore())
+ if (MI->isNotDuplicable() || MI->mayStore() ||
+ MI->hasUnmodeledSideEffects())
+ return false;
+
+ // Don't remat inline asm. We have no idea how expensive it is
+ // even if it's side effect free.
+ if (MI->isInlineAsm())
return false;
// Avoid instructions which load from potentially varying memory.
- if (TID.mayLoad() && !MI->isInvariantLoad(AA))
+ if (MI->mayLoad() && !MI->isInvariantLoad(AA))
return false;
// If any of the registers accessed are non-constant, conservatively assume
continue;
}
- // Only allow one virtual-register def, and that in the first operand.
- if (MO.isDef() != (i == 0))
- return false;
-
- // For the def, it should be the only def of that register.
- if (MO.isDef() && (llvm::next(MRI.def_begin(Reg)) != MRI.def_end() ||
- MRI.isLiveIn(Reg)))
+ // Only allow one virtual-register def. There may be multiple defs of the
+ // same virtual register, though.
+ if (MO.isDef() && Reg != DefReg)
return false;
// Don't allow any virtual-register uses. Rematting an instruction with
const MachineBasicBlock *MBB,
const MachineFunction &MF) const{
// Terminators and labels can't be scheduled around.
- if (MI->getDesc().isTerminator() || MI->isLabel())
+ if (MI->isTerminator() || MI->isLabel())
return true;
// Don't attempt to schedule around any instruction that defines
return false;
}
+// Provide a global flag for disabling the PreRA hazard recognizer that targets
+// may choose to honor.
+bool TargetInstrInfoImpl::usePreRAHazardRecognizer() const {
+ return !DisableHazardRecognizer;
+}
+
+// Default implementation of CreateTargetRAHazardRecognizer.
+ScheduleHazardRecognizer *TargetInstrInfoImpl::
+CreateTargetHazardRecognizer(const TargetMachine *TM,
+ const ScheduleDAG *DAG) const {
+ // Dummy hazard recognizer allows all instructions to issue.
+ return new ScheduleHazardRecognizer();
+}
+
// Default implementation of CreateTargetPostRAHazardRecognizer.
ScheduleHazardRecognizer *TargetInstrInfoImpl::
-CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II) const {
- return (ScheduleHazardRecognizer *)new PostRAHazardRecognizer(II);
+CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II,
+ const ScheduleDAG *DAG) const {
+ return (ScheduleHazardRecognizer *)
+ new ScoreboardHazardRecognizer(II, DAG, "post-RA-sched");
+}
+
+int
+TargetInstrInfo::getOperandLatency(const InstrItineraryData *ItinData,
+ SDNode *DefNode, unsigned DefIdx,
+ SDNode *UseNode, unsigned UseIdx) const {
+ if (!ItinData || ItinData->isEmpty())
+ return -1;
+
+ if (!DefNode->isMachineOpcode())
+ return -1;
+
+ unsigned DefClass = get(DefNode->getMachineOpcode()).getSchedClass();
+ if (!UseNode->isMachineOpcode())
+ return ItinData->getOperandCycle(DefClass, DefIdx);
+ unsigned UseClass = get(UseNode->getMachineOpcode()).getSchedClass();
+ return ItinData->getOperandLatency(DefClass, DefIdx, UseClass, UseIdx);
}
+
+int TargetInstrInfo::getInstrLatency(const InstrItineraryData *ItinData,
+ SDNode *N) const {
+ if (!ItinData || ItinData->isEmpty())
+ return 1;
+
+ if (!N->isMachineOpcode())
+ return 1;
+
+ return ItinData->getStageLatency(get(N->getMachineOpcode()).getSchedClass());
+}
+
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