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Don't bother doing latency calculations in the "fast" scheduler.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59461 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-11-17 19:52:36 +00:00
parent 2dcca9d53e
commit e93483d855
1 changed files with 5 additions and 15 deletions
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20
lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
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@ -139,12 +139,6 @@ void ScheduleDAGFast::Schedule() {
/// the AvailableQueue if the count reaches zero. Also update its cycle bound. /// the AvailableQueue if the count reaches zero. Also update its cycle bound.
void ScheduleDAGFast::ReleasePred(SUnit *PredSU, bool isChain, void ScheduleDAGFast::ReleasePred(SUnit *PredSU, bool isChain,
unsigned CurCycle) { unsigned CurCycle) {
// FIXME: the distance between two nodes is not always == the predecessor's
// latency. For example, the reader can very well read the register written
// by the predecessor later than the issue cycle. It also depends on the
// interrupt model (drain vs. freeze).
PredSU->CycleBound = std::max(PredSU->CycleBound, CurCycle + PredSU->Latency);
--PredSU->NumSuccsLeft; --PredSU->NumSuccsLeft;
#ifndef NDEBUG #ifndef NDEBUG
@ -277,7 +271,6 @@ SUnit *ScheduleDAGFast::CopyAndMoveSuccessors(SUnit *SU) {
// FIXME: Calculate height / depth and propagate the changes? // FIXME: Calculate height / depth and propagate the changes?
NewSU->Depth = SU->Depth; NewSU->Depth = SU->Depth;
NewSU->Height = SU->Height; NewSU->Height = SU->Height;
ComputeLatency(NewSU);
// LoadNode may already exist. This can happen when there is another // LoadNode may already exist. This can happen when there is another
// load from the same location and producing the same type of value // load from the same location and producing the same type of value
@ -293,7 +286,6 @@ SUnit *ScheduleDAGFast::CopyAndMoveSuccessors(SUnit *SU) {
LoadSU->Depth = SU->Depth; LoadSU->Depth = SU->Depth;
LoadSU->Height = SU->Height; LoadSU->Height = SU->Height;
ComputeLatency(LoadSU);
} }
SUnit *ChainPred = NULL; SUnit *ChainPred = NULL;
@ -530,13 +522,11 @@ void ScheduleDAGFast::ListScheduleBottomUp() {
LRegsMap.clear(); LRegsMap.clear();
SUnit *CurSU = AvailableQueue.pop(); SUnit *CurSU = AvailableQueue.pop();
while (CurSU) { while (CurSU) {
if (CurSU->CycleBound <= CurCycle) { SmallVector<unsigned, 4> LRegs;
SmallVector<unsigned, 4> LRegs; if (!DelayForLiveRegsBottomUp(CurSU, LRegs))
if (!DelayForLiveRegsBottomUp(CurSU, LRegs)) break;
break; Delayed = true;
Delayed = true; LRegsMap.insert(std::make_pair(CurSU, LRegs));
LRegsMap.insert(std::make_pair(CurSU, LRegs));
}
CurSU->isPending = true; // This SU is not in AvailableQueue right now. CurSU->isPending = true; // This SU is not in AvailableQueue right now.
NotReady.push_back(CurSU); NotReady.push_back(CurSU);