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Simplify AggressiveAntiDepBreaker's use of register aliases.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121805 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-12-14 23:23:15 +00:00
parent 16999da951
commit 597faa8f1f
1 changed files with 14 additions and 31 deletions
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45
lib/CodeGen/AggressiveAntiDepBreaker.cpp
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@ -155,16 +155,11 @@ void AggressiveAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
// In a return block, examine the function live-out regs.
for (MachineRegisterInfo::liveout_iterator I = MRI.liveout_begin(),
E = MRI.liveout_end(); I != E; ++I) {
unsigned Reg = *I;
State->UnionGroups(Reg, 0);
KillIndices[Reg] = BB->size();
DefIndices[Reg] = ~0u;
// Repeat, for all aliases.
for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) {
unsigned AliasReg = *Alias;
State->UnionGroups(AliasReg, 0);
KillIndices[AliasReg] = BB->size();
DefIndices[AliasReg] = ~0u;
for (const unsigned *Alias = TRI->getOverlaps(*I);
unsigned Reg = *Alias; ++Alias) {
State->UnionGroups(Reg, 0);
KillIndices[Reg] = BB->size();
DefIndices[Reg] = ~0u;
}
}
}
@ -176,16 +171,11 @@ void AggressiveAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
SE = BB->succ_end(); SI != SE; ++SI)
for (MachineBasicBlock::livein_iterator I = (*SI)->livein_begin(),
E = (*SI)->livein_end(); I != E; ++I) {
unsigned Reg = *I;
State->UnionGroups(Reg, 0);
KillIndices[Reg] = BB->size();
DefIndices[Reg] = ~0u;
// Repeat, for all aliases.
for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) {
unsigned AliasReg = *Alias;
State->UnionGroups(AliasReg, 0);
KillIndices[AliasReg] = BB->size();
DefIndices[AliasReg] = ~0u;
for (const unsigned *Alias = TRI->getOverlaps(*I);
unsigned Reg = *Alias; ++Alias) {
State->UnionGroups(Reg, 0);
KillIndices[Reg] = BB->size();
DefIndices[Reg] = ~0u;
}
}
@ -197,12 +187,8 @@ void AggressiveAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
for (const unsigned *I = TRI->getCalleeSavedRegs(); *I; ++I) {
unsigned Reg = *I;
if (!IsReturnBlock && !Pristine.test(Reg)) continue;
State->UnionGroups(Reg, 0);
KillIndices[Reg] = BB->size();
DefIndices[Reg] = ~0u;
// Repeat, for all aliases.
for (const unsigned *Alias = TRI->getAliasSet(Reg); *Alias; ++Alias) {
unsigned AliasReg = *Alias;
for (const unsigned *Alias = TRI->getOverlaps(Reg);
unsigned AliasReg = *Alias; ++Alias) {
State->UnionGroups(AliasReg, 0);
KillIndices[AliasReg] = BB->size();
DefIndices[AliasReg] = ~0u;
@ -435,12 +421,9 @@ void AggressiveAntiDepBreaker::PrescanInstruction(MachineInstr *MI,
continue;
// Update def for Reg and aliases.
DefIndices[Reg] = Count;
for (const unsigned *Alias = TRI->getAliasSet(Reg);
*Alias; ++Alias) {
unsigned AliasReg = *Alias;
for (const unsigned *Alias = TRI->getOverlaps(Reg);
unsigned AliasReg = *Alias; ++Alias)
DefIndices[AliasReg] = Count;
}
}
}