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Fix PR4210. Rewritter should track and update kills of sub-registers as well.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71848 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-05-15 06:48:19 +00:00
parent 8060424c40
commit 427a6b666b
1 changed files with 63 additions and 42 deletions
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105
lib/CodeGen/VirtRegRewriter.cpp
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@ -353,17 +353,6 @@ public:
// Utility Functions //
// ****************** //
/// InvalidateKill - A MI that defines the specified register is being deleted,
/// invalidate the register kill information.
static void InvalidateKill(unsigned Reg, BitVector &RegKills,
std::vector<MachineOperand*> &KillOps) {
if (RegKills[Reg]) {
KillOps[Reg]->setIsKill(false);
KillOps[Reg] = NULL;
RegKills.reset(Reg);
}
}
/// findSinglePredSuccessor - Return via reference a vector of machine basic
/// blocks each of which is a successor of the specified BB and has no other
/// predecessor.
@ -377,9 +366,31 @@ static void findSinglePredSuccessor(MachineBasicBlock *MBB,
}
}
/// InvalidateKill - Invalidate register kill information for a specific
/// register. This also unsets the kills marker on the last kill operand.
static void InvalidateKill(unsigned Reg,
const TargetRegisterInfo* TRI,
BitVector &RegKills,
std::vector<MachineOperand*> &KillOps) {
if (RegKills[Reg]) {
KillOps[Reg]->setIsKill(false);
KillOps[Reg] = NULL;
RegKills.reset(Reg);
for (const unsigned *SR = TRI->getSubRegisters(Reg); *SR; ++SR) {
if (RegKills[*SR]) {
KillOps[*SR]->setIsKill(false);
KillOps[*SR] = NULL;
RegKills.reset(*SR);
}
}
}
}
/// InvalidateKills - MI is going to be deleted. If any of its operands are
/// marked kill, then invalidate the information.
static void InvalidateKills(MachineInstr &MI, BitVector &RegKills,
static void InvalidateKills(MachineInstr &MI,
const TargetRegisterInfo* TRI,
BitVector &RegKills,
std::vector<MachineOperand*> &KillOps,
SmallVector<unsigned, 2> *KillRegs = NULL) {
for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) {
@ -393,8 +404,14 @@ static void InvalidateKills(MachineInstr &MI, BitVector &RegKills,
KillRegs->push_back(Reg);
assert(Reg < KillOps.size());
if (KillOps[Reg] == &MO) {
RegKills.reset(Reg);
KillOps[Reg] = NULL;
RegKills.reset(Reg);
for (const unsigned *SR = TRI->getSubRegisters(Reg); *SR; ++SR) {
if (RegKills[*SR]) {
KillOps[*SR] = NULL;
RegKills.reset(*SR);
}
}
}
}
}
@ -447,9 +464,9 @@ static bool InvalidateRegDef(MachineBasicBlock::iterator I,
/// UpdateKills - Track and update kill info. If a MI reads a register that is
/// marked kill, then it must be due to register reuse. Transfer the kill info
/// over.
static void UpdateKills(MachineInstr &MI, BitVector &RegKills,
std::vector<MachineOperand*> &KillOps,
const TargetRegisterInfo* TRI) {
static void UpdateKills(MachineInstr &MI, const TargetRegisterInfo* TRI,
BitVector &RegKills,
std::vector<MachineOperand*> &KillOps) {
for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) {
MachineOperand &MO = MI.getOperand(i);
if (!MO.isReg() || !MO.isUse())
@ -471,6 +488,10 @@ static void UpdateKills(MachineInstr &MI, BitVector &RegKills,
if (MO.isKill()) {
RegKills.set(Reg);
KillOps[Reg] = &MO;
for (const unsigned *SR = TRI->getSubRegisters(Reg); *SR; ++SR) {
RegKills.set(*SR);
KillOps[*SR] = &MO;
}
}
}
@ -482,9 +503,9 @@ static void UpdateKills(MachineInstr &MI, BitVector &RegKills,
RegKills.reset(Reg);
KillOps[Reg] = NULL;
// It also defines (or partially define) aliases.
for (const unsigned *AS = TRI->getAliasSet(Reg); *AS; ++AS) {
RegKills.reset(*AS);
KillOps[*AS] = NULL;
for (const unsigned *SR = TRI->getSubRegisters(Reg); *SR; ++SR) {
RegKills.reset(*SR);
KillOps[*SR] = NULL;
}
}
}
@ -610,7 +631,7 @@ void AvailableSpills::AddAvailableRegsToLiveIn(MachineBasicBlock &MBB,
NotAvailable.insert(Reg);
else {
MBB.addLiveIn(Reg);
InvalidateKill(Reg, RegKills, KillOps);
InvalidateKill(Reg, TRI, RegKills, KillOps);
}
// Skip over the same register.
@ -733,7 +754,7 @@ unsigned ReuseInfo::GetRegForReload(unsigned PhysReg, MachineInstr *MI,
Spills.addAvailable(NewOp.StackSlotOrReMat, NewPhysReg);
--MII;
UpdateKills(*MII, RegKills, KillOps, TRI);
UpdateKills(*MII, TRI, RegKills, KillOps);
DOUT << '\t' << *MII;
DOUT << "Reuse undone!\n";
@ -1012,7 +1033,7 @@ private:
AssignPhysToVirtReg(NewMIs[0], VirtReg, PhysReg);
VRM.transferRestorePts(&MI, NewMIs[0]);
MII = MBB.insert(MII, NewMIs[0]);
InvalidateKills(MI, RegKills, KillOps);
InvalidateKills(MI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
++NumModRefUnfold;
@ -1028,7 +1049,7 @@ private:
AssignPhysToVirtReg(NewMIs[0], VirtReg, PhysReg);
VRM.transferRestorePts(&NextMI, NewMIs[0]);
MBB.insert(NextMII, NewMIs[0]);
InvalidateKills(NextMI, RegKills, KillOps);
InvalidateKills(NextMI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(&NextMI);
MBB.erase(&NextMI);
++NumModRefUnfold;
@ -1150,7 +1171,7 @@ private:
VRM.assignVirt2Phys(UnfoldVR, UnfoldPR);
VRM.virtFolded(VirtReg, FoldedMI, VirtRegMap::isRef);
MII = MBB.insert(MII, FoldedMI);
InvalidateKills(MI, RegKills, KillOps);
InvalidateKills(MI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
MF.DeleteMachineInstr(NewMI);
@ -1234,13 +1255,13 @@ private:
MII = MBB.insert(MII, FoldedMI); // Update MII to backtrack.
// Delete all 3 old instructions.
InvalidateKills(*ReloadMI, RegKills, KillOps);
InvalidateKills(*ReloadMI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(ReloadMI);
MBB.erase(ReloadMI);
InvalidateKills(*DefMI, RegKills, KillOps);
InvalidateKills(*DefMI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(DefMI);
MBB.erase(DefMI);
InvalidateKills(MI, RegKills, KillOps);
InvalidateKills(MI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
@ -1279,7 +1300,7 @@ private:
DOUT << "Removed dead store:\t" << *LastStore;
++NumDSE;
SmallVector<unsigned, 2> KillRegs;
InvalidateKills(*LastStore, RegKills, KillOps, &KillRegs);
InvalidateKills(*LastStore, TRI, RegKills, KillOps, &KillRegs);
MachineBasicBlock::iterator PrevMII = LastStore;
bool CheckDef = PrevMII != MBB.begin();
if (CheckDef)
@ -1506,7 +1527,7 @@ private:
MachineInstr *CopyMI = prior(MII);
MachineOperand *KillOpnd = CopyMI->findRegisterUseOperand(InReg);
KillOpnd->setIsKill();
UpdateKills(*CopyMI, RegKills, KillOps, TRI);
UpdateKills(*CopyMI, TRI, RegKills, KillOps);
DOUT << '\t' << *CopyMI;
++NumCopified;
@ -1528,7 +1549,7 @@ private:
// Remember it's available.
Spills.addAvailable(SSorRMId, Phys);
UpdateKills(*prior(MII), RegKills, KillOps, TRI);
UpdateKills(*prior(MII), TRI, RegKills, KillOps);
DOUT << '\t' << *prior(MII);
}
}
@ -1771,7 +1792,7 @@ private:
TII->copyRegToReg(MBB, &MI, DesignatedReg, PhysReg, RC, RC);
MachineInstr *CopyMI = prior(MII);
UpdateKills(*CopyMI, RegKills, KillOps, TRI);
UpdateKills(*CopyMI, TRI, RegKills, KillOps);
// This invalidates DesignatedReg.
Spills.ClobberPhysReg(DesignatedReg);
@ -1827,7 +1848,7 @@ private:
KilledMIRegs.insert(VirtReg);
}
UpdateKills(*prior(MII), RegKills, KillOps, TRI);
UpdateKills(*prior(MII), TRI, RegKills, KillOps);
DOUT << '\t' << *prior(MII);
}
unsigned RReg = SubIdx ? TRI->getSubReg(PhysReg, SubIdx) : PhysReg;
@ -1843,7 +1864,7 @@ private:
MachineInstr* DeadStore = MaybeDeadStores[PDSSlot];
if (DeadStore) {
DOUT << "Removed dead store:\t" << *DeadStore;
InvalidateKills(*DeadStore, RegKills, KillOps);
InvalidateKills(*DeadStore, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(DeadStore);
MBB.erase(DeadStore);
MaybeDeadStores[PDSSlot] = NULL;
@ -1907,11 +1928,11 @@ private:
} else {
DOUT << "Removing now-noop copy: " << MI;
// Unset last kill since it's being reused.
InvalidateKill(InReg, RegKills, KillOps);
InvalidateKill(InReg, TRI, RegKills, KillOps);
Spills.disallowClobberPhysReg(InReg);
}
InvalidateKills(MI, RegKills, KillOps);
InvalidateKills(MI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
Erased = true;
@ -1923,7 +1944,7 @@ private:
if (PhysReg &&
TII->unfoldMemoryOperand(MF, &MI, PhysReg, false, false, NewMIs)) {
MBB.insert(MII, NewMIs[0]);
InvalidateKills(MI, RegKills, KillOps);
InvalidateKills(MI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
Erased = true;
@ -1960,7 +1981,7 @@ private:
NewStore = NewMIs[1];
MBB.insert(MII, NewStore);
VRM.addSpillSlotUse(SS, NewStore);
InvalidateKills(MI, RegKills, KillOps);
InvalidateKills(MI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
Erased = true;
@ -1976,7 +1997,7 @@ private:
if (isDead) { // Previous store is dead.
// If we get here, the store is dead, nuke it now.
DOUT << "Removed dead store:\t" << *DeadStore;
InvalidateKills(*DeadStore, RegKills, KillOps);
InvalidateKills(*DeadStore, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(DeadStore);
MBB.erase(DeadStore);
if (!NewStore)
@ -2044,7 +2065,7 @@ private:
++NumDCE;
DOUT << "Removing now-noop copy: " << MI;
SmallVector<unsigned, 2> KillRegs;
InvalidateKills(MI, RegKills, KillOps, &KillRegs);
InvalidateKills(MI, TRI, RegKills, KillOps, &KillRegs);
if (MO.isDead() && !KillRegs.empty()) {
// Source register or an implicit super/sub-register use is killed.
assert(KillRegs[0] == Dst ||
@ -2131,11 +2152,11 @@ private:
if (TII->isMoveInstr(MI, Src, Dst, SrcSR, DstSR) && Src == Dst) {
++NumDCE;
DOUT << "Removing now-noop copy: " << MI;
InvalidateKills(MI, RegKills, KillOps);
InvalidateKills(MI, TRI, RegKills, KillOps);
VRM.RemoveMachineInstrFromMaps(&MI);
MBB.erase(&MI);
Erased = true;
UpdateKills(*LastStore, RegKills, KillOps, TRI);
UpdateKills(*LastStore, TRI, RegKills, KillOps);
goto ProcessNextInst;
}
}
@ -2145,7 +2166,7 @@ private:
DistanceMap.insert(std::make_pair(&MI, Dist++));
if (!Erased && !BackTracked) {
for (MachineBasicBlock::iterator II = &MI; II != NextMII; ++II)
UpdateKills(*II, RegKills, KillOps, TRI);
UpdateKills(*II, TRI, RegKills, KillOps);
}
MII = NextMII;
}