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mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-14 11:32:34 +00:00

<rdar://problem/7453528>. Track only physical registers that are valid for the target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90970 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Goodwin 2009-12-09 17:18:22 +00:00
parent 1a247f32dd
commit 990d285765
4 changed files with 28 additions and 17 deletions

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@ -38,16 +38,19 @@ DebugMod("agg-antidep-debugmod",
cl::desc("Debug control for aggressive anti-dep breaker"),
cl::init(0), cl::Hidden);
AggressiveAntiDepState::AggressiveAntiDepState(MachineBasicBlock *BB) :
GroupNodes(TargetRegisterInfo::FirstVirtualRegister, 0) {
// Initialize all registers to be in their own group. Initially we
// assign the register to the same-indexed GroupNode.
for (unsigned i = 0; i < TargetRegisterInfo::FirstVirtualRegister; ++i)
GroupNodeIndices[i] = i;
AggressiveAntiDepState::AggressiveAntiDepState(const unsigned TargetRegs,
MachineBasicBlock *BB) :
NumTargetRegs(TargetRegs), GroupNodes(TargetRegs, 0) {
// Initialize the indices to indicate that no registers are live.
std::fill(KillIndices, array_endof(KillIndices), ~0u);
std::fill(DefIndices, array_endof(DefIndices), BB->size());
const unsigned BBSize = BB->size();
for (unsigned i = 0; i < NumTargetRegs; ++i) {
// Initialize all registers to be in their own group. Initially we
// assign the register to the same-indexed GroupNode.
GroupNodeIndices[i] = i;
// Initialize the indices to indicate that no registers are live.
KillIndices[i] = ~0u;
DefIndices[i] = BBSize;
}
}
unsigned AggressiveAntiDepState::GetGroup(unsigned Reg)
@ -64,7 +67,7 @@ void AggressiveAntiDepState::GetGroupRegs(
std::vector<unsigned> &Regs,
std::multimap<unsigned, AggressiveAntiDepState::RegisterReference> *RegRefs)
{
for (unsigned Reg = 0; Reg != TargetRegisterInfo::FirstVirtualRegister; ++Reg) {
for (unsigned Reg = 0; Reg != NumTargetRegs; ++Reg) {
if ((GetGroup(Reg) == Group) && (RegRefs->count(Reg) > 0))
Regs.push_back(Reg);
}
@ -137,7 +140,7 @@ AggressiveAntiDepBreaker::~AggressiveAntiDepBreaker() {
void AggressiveAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
assert(State == NULL);
State = new AggressiveAntiDepState(BB);
State = new AggressiveAntiDepState(TRI->getNumRegs(), BB);
bool IsReturnBlock = (!BB->empty() && BB->back().getDesc().isReturn());
unsigned *KillIndices = State->GetKillIndices();
@ -220,7 +223,7 @@ void AggressiveAntiDepBreaker::Observe(MachineInstr *MI, unsigned Count,
DEBUG(errs() << "\tRegs:");
unsigned *DefIndices = State->GetDefIndices();
for (unsigned Reg = 0; Reg != TargetRegisterInfo::FirstVirtualRegister; ++Reg) {
for (unsigned Reg = 0; Reg != TRI->getNumRegs(); ++Reg) {
// If Reg is current live, then mark that it can't be renamed as
// we don't know the extent of its live-range anymore (now that it
// has been scheduled). If it is not live but was defined in the

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@ -44,6 +44,10 @@ namespace llvm {
} RegisterReference;
private:
/// NumTargetRegs - Number of non-virtual target registers
/// (i.e. TRI->getNumRegs()).
const unsigned NumTargetRegs;
/// GroupNodes - Implements a disjoint-union data structure to
/// form register groups. A node is represented by an index into
/// the vector. A node can "point to" itself to indicate that it
@ -69,7 +73,7 @@ namespace llvm {
unsigned DefIndices[TargetRegisterInfo::FirstVirtualRegister];
public:
AggressiveAntiDepState(MachineBasicBlock *BB);
AggressiveAntiDepState(const unsigned TargetRegs, MachineBasicBlock *BB);
/// GetKillIndices - Return the kill indices.
unsigned *GetKillIndices() { return KillIndices; }

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@ -43,8 +43,11 @@ void CriticalAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
static_cast<const TargetRegisterClass *>(0));
// Initialize the indices to indicate that no registers are live.
std::fill(KillIndices, array_endof(KillIndices), ~0u);
std::fill(DefIndices, array_endof(DefIndices), BB->size());
const unsigned BBSize = BB->size();
for (unsigned i = 0; i < TRI->getNumRegs(); ++i) {
KillIndices[i] = ~0u;
DefIndices[i] = BBSize;
}
// Clear "do not change" set.
KeepRegs.clear();
@ -122,7 +125,7 @@ void CriticalAntiDepBreaker::Observe(MachineInstr *MI, unsigned Count,
// may have been rescheduled and its lifetime may overlap with registers
// in ways not reflected in our current liveness state. For each such
// register, adjust the liveness state to be conservatively correct.
for (unsigned Reg = 0; Reg != TargetRegisterInfo::FirstVirtualRegister; ++Reg)
for (unsigned Reg = 0; Reg != TRI->getNumRegs(); ++Reg)
if (DefIndices[Reg] < InsertPosIndex && DefIndices[Reg] >= Count) {
assert(KillIndices[Reg] == ~0u && "Clobbered register is live!");
// Mark this register to be non-renamable.

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@ -373,7 +373,8 @@ void SchedulePostRATDList::FinishBlock() {
///
void SchedulePostRATDList::StartBlockForKills(MachineBasicBlock *BB) {
// Initialize the indices to indicate that no registers are live.
std::fill(KillIndices, array_endof(KillIndices), ~0u);
for (unsigned i = 0; i < TRI->getNumRegs(); ++i)
KillIndices[i] = ~0u;
// Determine the live-out physregs for this block.
if (!BB->empty() && BB->back().getDesc().isReturn()) {