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Enable -schedmodel, but prefer itineraries until we have more benchmark data.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165188 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-10-04 00:24:34 +00:00
parent 395c1502a7
commit 72fd0a9448
1 changed files with 53 additions and 54 deletions
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107
lib/CodeGen/TargetSchedule.cpp
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@ -21,7 +21,7 @@
using namespace llvm;
static cl::opt<bool> EnableSchedModel("schedmodel", cl::Hidden, cl::init(false),
static cl::opt<bool> EnableSchedModel("schedmodel", cl::Hidden, cl::init(true),
cl::desc("Use TargetSchedModel for latency lookup"));
static cl::opt<bool> EnableSchedItins("scheditins", cl::Hidden, cl::init(true),
@ -123,60 +123,59 @@ unsigned TargetSchedModel::computeOperandLatency(
if (DefLatency >= 0)
return DefLatency;
if (!FindMin && EnableSchedModel && hasInstrSchedModel()) {
const MCSchedClassDesc *SCDesc = resolveSchedClass(DefMI);
unsigned DefIdx = findDefIdx(DefMI, DefOperIdx);
if (DefIdx < SCDesc->NumWriteLatencyEntries) {
// Lookup the definition's write latency in SubtargetInfo.
const MCWriteLatencyEntry *WLEntry =
STI->getWriteLatencyEntry(SCDesc, DefIdx);
unsigned WriteID = WLEntry->WriteResourceID;
unsigned Latency = WLEntry->Cycles;
if (!UseMI)
return Latency;
// Lookup the use's latency adjustment in SubtargetInfo.
const MCSchedClassDesc *UseDesc = resolveSchedClass(UseMI);
if (UseDesc->NumReadAdvanceEntries == 0)
return Latency;
unsigned UseIdx = findUseIdx(UseMI, UseOperIdx);
return Latency - STI->getReadAdvanceCycles(UseDesc, UseIdx, WriteID);
if (EnableSchedItins && hasInstrItineraries()) {
int OperLatency = 0;
if (UseMI) {
OperLatency =
TII->getOperandLatency(&InstrItins, DefMI, DefOperIdx, UseMI, UseOperIdx);
}
// If DefIdx does not exist in the model (e.g. implicit defs), then return
// unit latency (defaultDefLatency may be too conservative).
else {
unsigned DefClass = DefMI->getDesc().getSchedClass();
OperLatency = InstrItins.getOperandCycle(DefClass, DefOperIdx);
}
if (OperLatency >= 0)
return OperLatency;
// No operand latency was found.
unsigned InstrLatency = TII->getInstrLatency(&InstrItins, DefMI);
// Expected latency is the max of the stage latency and itinerary props.
if (!FindMin)
InstrLatency = std::max(InstrLatency,
TII->defaultDefLatency(&SchedModel, DefMI));
return InstrLatency;
}
assert(!FindMin && EnableSchedModel && hasInstrSchedModel() &&
"Expected a SchedModel for this cpu");
const MCSchedClassDesc *SCDesc = resolveSchedClass(DefMI);
unsigned DefIdx = findDefIdx(DefMI, DefOperIdx);
if (DefIdx < SCDesc->NumWriteLatencyEntries) {
// Lookup the definition's write latency in SubtargetInfo.
const MCWriteLatencyEntry *WLEntry =
STI->getWriteLatencyEntry(SCDesc, DefIdx);
unsigned WriteID = WLEntry->WriteResourceID;
unsigned Latency = WLEntry->Cycles;
if (!UseMI)
return Latency;
// Lookup the use's latency adjustment in SubtargetInfo.
const MCSchedClassDesc *UseDesc = resolveSchedClass(UseMI);
if (UseDesc->NumReadAdvanceEntries == 0)
return Latency;
unsigned UseIdx = findUseIdx(UseMI, UseOperIdx);
return Latency - STI->getReadAdvanceCycles(UseDesc, UseIdx, WriteID);
}
// If DefIdx does not exist in the model (e.g. implicit defs), then return
// unit latency (defaultDefLatency may be too conservative).
#ifndef NDEBUG
if (SCDesc->isValid() && !DefMI->getOperand(DefOperIdx).isImplicit()
&& !DefMI->getDesc().OpInfo[DefOperIdx].isOptionalDef()) {
std::string Err;
raw_string_ostream ss(Err);
ss << "DefIdx " << DefIdx << " exceeds machine model writes for "
<< *DefMI;
report_fatal_error(ss.str());
}
if (SCDesc->isValid() && !DefMI->getOperand(DefOperIdx).isImplicit()
&& !DefMI->getDesc().OpInfo[DefOperIdx].isOptionalDef()) {
std::string Err;
raw_string_ostream ss(Err);
ss << "DefIdx " << DefIdx << " exceeds machine model writes for "
<< *DefMI;
report_fatal_error(ss.str());
}
#endif
return 1;
}
assert(EnableSchedItins && hasInstrItineraries() &&
"operand latency requires itinerary");
int OperLatency = 0;
if (UseMI) {
OperLatency =
TII->getOperandLatency(&InstrItins, DefMI, DefOperIdx, UseMI, UseOperIdx);
}
else {
unsigned DefClass = DefMI->getDesc().getSchedClass();
OperLatency = InstrItins.getOperandCycle(DefClass, DefOperIdx);
}
if (OperLatency >= 0)
return OperLatency;
// No operand latency was found.
unsigned InstrLatency = TII->getInstrLatency(&InstrItins, DefMI);
// Expected latency is the max of the stage latency and itinerary props.
if (!FindMin)
InstrLatency = std::max(InstrLatency,
TII->defaultDefLatency(&SchedModel, DefMI));
return InstrLatency;
return 1;
}