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Rearrange code to reduce the nesting level. No functionality change. 

llvm-svn: 59580
This commit is contained in:
Dan Gohman 2008-11-19 02:00:32 +00:00
parent a7c279ba40
commit 82016c243b
1 changed files with 36 additions and 36 deletions
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72
llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
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@ -1754,44 +1754,44 @@ void BURegReductionPriorityQueue::AddPseudoTwoAddrDeps() {
unsigned NumRes = TID.getNumDefs();
unsigned NumOps = TID.getNumOperands() - NumRes;
for (unsigned j = 0; j != NumOps; ++j) {
if (TID.getOperandConstraint(j+NumRes, TOI::TIED_TO) != -1) {
SDNode *DU = SU->getNode()->getOperand(j).getNode();
if (DU->getNodeId() == -1)
if (TID.getOperandConstraint(j+NumRes, TOI::TIED_TO) == -1)
continue;
SDNode *DU = SU->getNode()->getOperand(j).getNode();
if (DU->getNodeId() == -1)
continue;
const SUnit *DUSU = &(*SUnits)[DU->getNodeId()];
if (!DUSU) continue;
for (SUnit::const_succ_iterator I = DUSU->Succs.begin(),
E = DUSU->Succs.end(); I != E; ++I) {
if (I->isCtrl) continue;
SUnit *SuccSU = I->Dep;
if (SuccSU == SU)
continue;
const SUnit *DUSU = &(*SUnits)[DU->getNodeId()];
if (!DUSU) continue;
for (SUnit::const_succ_iterator I = DUSU->Succs.begin(),
E = DUSU->Succs.end(); I != E; ++I) {
if (I->isCtrl) continue;
SUnit *SuccSU = I->Dep;
if (SuccSU == SU)
// Be conservative. Ignore if nodes aren't at roughly the same
// depth and height.
if (SuccSU->Height < SU->Height && (SU->Height - SuccSU->Height) > 1)
continue;
if (!SuccSU->getNode() || !SuccSU->getNode()->isMachineOpcode())
continue;
// Don't constrain nodes with physical register defs if the
// predecessor can clobber them.
if (SuccSU->hasPhysRegDefs) {
if (canClobberPhysRegDefs(SuccSU, SU, TII, TRI))
continue;
// Be conservative. Ignore if nodes aren't at roughly the same
// depth and height.
if (SuccSU->Height < SU->Height && (SU->Height - SuccSU->Height) > 1)
continue;
if (!SuccSU->getNode() || !SuccSU->getNode()->isMachineOpcode())
continue;
// Don't constrain nodes with physical register defs if the
// predecessor can clobber them.
if (SuccSU->hasPhysRegDefs) {
if (canClobberPhysRegDefs(SuccSU, SU, TII, TRI))
continue;
}
// Don't constraint extract_subreg / insert_subreg these may be
// coalesced away. We don't them close to their uses.
unsigned SuccOpc = SuccSU->getNode()->getMachineOpcode();
if (SuccOpc == TargetInstrInfo::EXTRACT_SUBREG ||
SuccOpc == TargetInstrInfo::INSERT_SUBREG)
continue;
if ((!canClobber(SuccSU, DUSU) ||
(hasCopyToRegUse(SU) && !hasCopyToRegUse(SuccSU)) ||
(!SU->isCommutable && SuccSU->isCommutable)) &&
!scheduleDAG->IsReachable(SuccSU, SU)) {
DOUT << "Adding an edge from SU # " << SU->NodeNum
<< " to SU #" << SuccSU->NodeNum << "\n";
scheduleDAG->AddPred(SU, SuccSU, true, true);
}
}
// Don't constraint extract_subreg / insert_subreg these may be
// coalesced away. We don't them close to their uses.
unsigned SuccOpc = SuccSU->getNode()->getMachineOpcode();
if (SuccOpc == TargetInstrInfo::EXTRACT_SUBREG ||
SuccOpc == TargetInstrInfo::INSERT_SUBREG)
continue;
if ((!canClobber(SuccSU, DUSU) ||
(hasCopyToRegUse(SU) && !hasCopyToRegUse(SuccSU)) ||
(!SU->isCommutable && SuccSU->isCommutable)) &&
!scheduleDAG->IsReachable(SuccSU, SU)) {
DOUT << "Adding an edge from SU # " << SU->NodeNum
<< " to SU #" << SuccSU->NodeNum << "\n";
scheduleDAG->AddPred(SU, SuccSU, true, true);
}
}
}