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Avoid inserting a live register more than once.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42410 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-09-27 18:46:06 +00:00
parent ff37adc0ce
commit cd1c00cc65
1 changed files with 18 additions and 8 deletions
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18
lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
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@ -25,6 +25,7 @@
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Compiler.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include <climits>
@ -523,19 +524,24 @@ bool ScheduleDAGRRList::DelayForLiveRegsBottomUp(SUnit *SU,
if (LiveRegs.empty())
return false;
SmallSet<unsigned, 4> RegAdded;
// If this node would clobber any "live" register, then it's not ready.
for (SUnit::pred_iterator I = SU->Preds.begin(), E = SU->Preds.end();
I != E; ++I) {
if (I->Cost < 0) {
unsigned Reg = I->Reg;
if (LiveRegs.count(Reg) && LiveRegDefs[Reg] != I->Dep)
if (LiveRegs.count(Reg) && LiveRegDefs[Reg] != I->Dep) {
if (RegAdded.insert(Reg))
LRegs.push_back(Reg);
}
for (const unsigned *Alias = MRI->getAliasSet(Reg);
*Alias; ++Alias)
if (LiveRegs.count(*Alias) && LiveRegDefs[*Alias] != I->Dep)
if (LiveRegs.count(*Alias) && LiveRegDefs[*Alias] != I->Dep) {
if (RegAdded.insert(*Alias))
LRegs.push_back(*Alias);
}
}
}
for (unsigned i = 0, e = SU->FlaggedNodes.size()+1; i != e; ++i) {
SDNode *Node = (i == 0) ? SU->Node : SU->FlaggedNodes[i-1];
@ -545,14 +551,18 @@ bool ScheduleDAGRRList::DelayForLiveRegsBottomUp(SUnit *SU,
if (!TID.ImplicitDefs)
continue;
for (const unsigned *Reg = TID.ImplicitDefs; *Reg; ++Reg) {
if (LiveRegs.count(*Reg) && LiveRegDefs[*Reg] != SU)
if (LiveRegs.count(*Reg) && LiveRegDefs[*Reg] != SU) {
if (RegAdded.insert(*Reg))
LRegs.push_back(*Reg);
}
for (const unsigned *Alias = MRI->getAliasSet(*Reg);
*Alias; ++Alias)
if (LiveRegs.count(*Alias) && LiveRegDefs[*Alias] != SU)
if (LiveRegs.count(*Alias) && LiveRegDefs[*Alias] != SU) {
if (RegAdded.insert(*Alias))
LRegs.push_back(*Alias);
}
}
}
return !LRegs.empty();
}