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misched: avoid scheduling an instruction twice.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165416 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-10-08 18:53:53 +00:00
parent cd585084e5
commit 30c6ec2199
1 changed files with 29 additions and 25 deletions
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4
lib/CodeGen/MachineScheduler.cpp
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@ -495,6 +495,7 @@ void ScheduleDAGMI::schedule() {
bool IsTopNode = false; bool IsTopNode = false;
while (SUnit *SU = SchedImpl->pickNode(IsTopNode)) { while (SUnit *SU = SchedImpl->pickNode(IsTopNode)) {
assert(!SU->isScheduled && "Node already scheduled");
if (!checkSchedLimit()) if (!checkSchedLimit())
break; break;
@ -1119,6 +1120,7 @@ SUnit *ConvergingScheduler::pickNode(bool &IsTopNode) {
return NULL; return NULL;
} }
SUnit *SU; SUnit *SU;
do {
if (ForceTopDown) { if (ForceTopDown) {
SU = Top.pickOnlyChoice(); SU = Top.pickOnlyChoice();
if (!SU) { if (!SU) {
@ -1146,6 +1148,8 @@ SUnit *ConvergingScheduler::pickNode(bool &IsTopNode) {
else { else {
SU = pickNodeBidrectional(IsTopNode); SU = pickNodeBidrectional(IsTopNode);
} }
} while (SU->isScheduled);
if (SU->isTopReady()) if (SU->isTopReady())
Top.removeReady(SU); Top.removeReady(SU);
if (SU->isBottomReady()) if (SU->isBottomReady())