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Make sure we correctly set LiveRegGens when a call is unscheduled. <rdar://problem/10460321>. No testcase because this is very sensitive to scheduling. 

llvm-svn: 146087
This commit is contained in:
Eli Friedman 2011-12-07 22:24:28 +00:00
parent b2e05cb6b1
commit d5c173fad0
1 changed files with 8 additions and 1 deletions
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9
llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
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@ -146,6 +146,10 @@ private:
/// and similar queries.
ScheduleDAGTopologicalSort Topo;
// Hack to keep track of the inverse of FindCallSeqStart without more crazy
// DAG crawling.
DenseMap<SUnit*, SUnit*> CallSeqEndForStart;
public:
ScheduleDAGRRList(MachineFunction &mf, bool needlatency,
SchedulingPriorityQueue *availqueue,
@ -306,6 +310,7 @@ void ScheduleDAGRRList::Schedule() {
// to track the virtual resource of a calling sequence.
LiveRegDefs.resize(TRI->getNumRegs() + 1, NULL);
LiveRegGens.resize(TRI->getNumRegs() + 1, NULL);
CallSeqEndForStart.clear();
// Build the scheduling graph.
BuildSchedGraph(NULL);
@ -524,6 +529,8 @@ void ScheduleDAGRRList::ReleasePredecessors(SUnit *SU) {
SDNode *N = FindCallSeqStart(Node, NestLevel, MaxNest, TII);
SUnit *Def = &SUnits[N->getNodeId()];
CallSeqEndForStart[Def] = SU;
++NumLiveRegs;
LiveRegDefs[CallResource] = Def;
LiveRegGens[CallResource] = SU;
@ -790,7 +797,7 @@ void ScheduleDAGRRList::UnscheduleNodeBottomUp(SUnit *SU) {
SUNode->getMachineOpcode() == (unsigned)TII->getCallFrameSetupOpcode()) {
++NumLiveRegs;
LiveRegDefs[CallResource] = SU;
LiveRegGens[CallResource] = NULL;
LiveRegGens[CallResource] = CallSeqEndForStart[SU];
}
}