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When a hazard recognizer needs noops to be inserted, do so. This represents

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noops as null pointers in the instruction sequence.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26564 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-05 23:51:47 +00:00
parent 202bc85a95
commit a93dfcd40a
2 changed files with 19 additions and 10 deletions
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4
lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
View File

@ -370,6 +370,10 @@ void ScheduleDAG::EmitNode(NodeInfo *NI) {
NI->VRBase = VRBase;
}
void ScheduleDAG::EmitNoop() {
TII->insertNoop(*BB, BB->end());
}
/// EmitAll - Emit all nodes in schedule sorted order.
///
void ScheduleDAG::EmitAll() {

25
lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp
View File

@ -214,7 +214,7 @@ class ScheduleDAGList : public ScheduleDAG {
private:
// SDNode to SUnit mapping (many to one).
std::map<SDNode*, SUnit*> SUnitMap;
// The schedule.
// The schedule. Null SUnit*'s represend noop instructions.
std::vector<SUnit*> Sequence;
// Current scheduling cycle.
unsigned CurrCycle;
@ -523,7 +523,7 @@ void ScheduleDAGList::ListScheduleTopDown() {
// processors without pipeline interlocks and other cases.
DEBUG(std::cerr << "*** Emitting noop");
HazardRec->EmitNoop();
// FIXME: Add a noop to the schedule!!
Sequence.push_back(0); // NULL SUnit -> noop
++NumNoops;
}
}
@ -688,21 +688,26 @@ void ScheduleDAGList::BuildSchedUnits() {
/// EmitSchedule - Emit the machine code in scheduled order.
void ScheduleDAGList::EmitSchedule() {
for (unsigned i = 0, e = Sequence.size(); i != e; i++) {
SDNode *N;
SUnit *SU = Sequence[i];
for (unsigned j = 0, ee = SU->FlaggedNodes.size(); j != ee; j++) {
N = SU->FlaggedNodes[j];
EmitNode(getNI(N));
if (SUnit *SU = Sequence[i]) {
for (unsigned j = 0, ee = SU->FlaggedNodes.size(); j != ee; j++) {
SDNode *N = SU->FlaggedNodes[j];
EmitNode(getNI(N));
}
EmitNode(getNI(SU->Node));
} else {
// Null SUnit* is a noop.
EmitNoop();
}
EmitNode(getNI(SU->Node));
}
}
/// dump - dump the schedule.
void ScheduleDAGList::dump() const {
for (unsigned i = 0, e = Sequence.size(); i != e; i++) {
SUnit *SU = Sequence[i];
SU->dump(&DAG, false);
if (SUnit *SU = Sequence[i])
SU->dump(&DAG, false);
else
std::cerr << "**** NOOP ****\n";
}
}