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Extend the instruction itinerary model to include the ability to indicate the def and use cycle for each operand. This additional information is optional, so existing itineraries do not need to be changed.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79247 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Goodwin
2009-08-17 16:02:57 +00:00
parent 8f4b1ec02b
commit fac8541dd4
5 changed files with 139 additions and 67 deletions
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11
lib/CodeGen/ExactHazardRecognizer.cpp
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@ -33,7 +33,8 @@ ExactHazardRecognizer::ExactHazardRecognizer(const InstrItineraryData &LItinData
for (unsigned idx = 0; ; ++idx) {
// If the begin stage of an itinerary has 0 cycles and units,
// then we have reached the end of the itineraries.
const InstrStage *IS = ItinData.begin(idx), *E = ItinData.end(idx);
const InstrStage *IS = ItinData.beginStage(idx);
const InstrStage *E = ItinData.endStage(idx);
if ((IS->getCycles() == 0) && (IS->getUnits() == 0))
break;
@ -87,8 +88,8 @@ ExactHazardRecognizer::HazardType ExactHazardRecognizer::getHazardType(SUnit *SU
// Use the itinerary for the underlying instruction to check for
// free FU's in the scoreboard at the appropriate future cycles.
unsigned idx = SU->getInstr()->getDesc().getSchedClass();
for (const InstrStage *IS = ItinData.begin(idx), *E = ItinData.end(idx);
IS != E; ++IS) {
for (const InstrStage *IS = ItinData.beginStage(idx),
*E = ItinData.endStage(idx); IS != E; ++IS) {
// We must find one of the stage's units free for every cycle the
// stage is occupied. FIXME it would be more accurate to find the
// same unit free in all the cycles.
@ -119,8 +120,8 @@ void ExactHazardRecognizer::EmitInstruction(SUnit *SU) {
// Use the itinerary for the underlying instruction to reserve FU's
// in the scoreboard at the appropriate future cycles.
unsigned idx = SU->getInstr()->getDesc().getSchedClass();
for (const InstrStage *IS = ItinData.begin(idx), *E = ItinData.end(idx);
IS != E; ++IS) {
for (const InstrStage *IS = ItinData.beginStage(idx),
*E = ItinData.endStage(idx); IS != E; ++IS) {
// We must reserve one of the stage's units for every cycle the
// stage is occupied. FIXME it would be more accurate to reserve
// the same unit free in all the cycles.