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Factor out scoreboard into separate class. This way we might have several different score boards.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100644 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2010-04-07 18:19:24 +00:00
parent 2eeeff8371
commit 1298948c5c
2 changed files with 72 additions and 60 deletions
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62
lib/CodeGen/ExactHazardRecognizer.cpp
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@ -29,7 +29,7 @@ ExactHazardRecognizer(const InstrItineraryData &LItinData) :
// Determine the maximum depth of any itinerary. This determines the
// depth of the scoreboard. We always make the scoreboard at least 1
// cycle deep to avoid dealing with the boundary condition.
ScoreboardDepth = 1;
unsigned ScoreboardDepth = 1;
if (!ItinData.isEmpty()) {
for (unsigned idx = 0; ; ++idx) {
if (ItinData.isEndMarker(idx))
@ -45,35 +45,25 @@ ExactHazardRecognizer(const InstrItineraryData &LItinData) :
}
}
Scoreboard = new unsigned[ScoreboardDepth];
ScoreboardHead = 0;
Scoreboard.reset(ScoreboardDepth);
DEBUG(dbgs() << "Using exact hazard recognizer: ScoreboardDepth = "
<< ScoreboardDepth << '\n');
}
ExactHazardRecognizer::~ExactHazardRecognizer() {
delete [] Scoreboard;
}
void ExactHazardRecognizer::Reset() {
memset(Scoreboard, 0, ScoreboardDepth * sizeof(unsigned));
ScoreboardHead = 0;
Scoreboard.reset();
}
unsigned ExactHazardRecognizer::getFutureIndex(unsigned offset) {
return (ScoreboardHead + offset) % ScoreboardDepth;
}
void ExactHazardRecognizer::dumpScoreboard() {
void ExactHazardRecognizer::ScoreBoard::dump() const {
dbgs() << "Scoreboard:\n";
unsigned last = ScoreboardDepth - 1;
while ((last > 0) && (Scoreboard[getFutureIndex(last)] == 0))
unsigned last = Depth - 1;
while ((last > 0) && ((*this)[last] == 0))
last--;
for (unsigned i = 0; i <= last; i++) {
unsigned FUs = Scoreboard[getFutureIndex(i)];
unsigned FUs = (*this)[i];
dbgs() << "\t";
for (int j = 31; j >= 0; j--)
dbgs() << ((FUs & (1 << j)) ? '1' : '0');
@ -96,11 +86,10 @@ ExactHazardRecognizer::HazardType ExactHazardRecognizer::getHazardType(SUnit *SU
// stage is occupied. FIXME it would be more accurate to find the
// same unit free in all the cycles.
for (unsigned int i = 0; i < IS->getCycles(); ++i) {
assert(((cycle + i) < ScoreboardDepth) &&
assert(((cycle + i) < Scoreboard.getDepth()) &&
"Scoreboard depth exceeded!");
unsigned index = getFutureIndex(cycle + i);
unsigned freeUnits = IS->getUnits() & ~Scoreboard[index];
unsigned freeUnits = IS->getUnits() & ~Scoreboard[cycle + i];
if (!freeUnits) {
DEBUG(dbgs() << "*** Hazard in cycle " << (cycle + i) << ", ");
DEBUG(dbgs() << "SU(" << SU->NodeNum << "): ");
@ -108,14 +97,14 @@ ExactHazardRecognizer::HazardType ExactHazardRecognizer::getHazardType(SUnit *SU
return Hazard;
}
}
// Advance the cycle to the next stage.
cycle += IS->getNextCycles();
}
return NoHazard;
}
void ExactHazardRecognizer::EmitInstruction(SUnit *SU) {
if (ItinData.isEmpty())
return;
@ -131,31 +120,30 @@ void ExactHazardRecognizer::EmitInstruction(SUnit *SU) {
// stage is occupied. FIXME it would be more accurate to reserve
// the same unit free in all the cycles.
for (unsigned int i = 0; i < IS->getCycles(); ++i) {
assert(((cycle + i) < ScoreboardDepth) &&
assert(((cycle + i) < Scoreboard.getDepth()) &&
"Scoreboard depth exceeded!");
unsigned index = getFutureIndex(cycle + i);
unsigned freeUnits = IS->getUnits() & ~Scoreboard[index];
unsigned freeUnits = IS->getUnits() & ~Scoreboard[cycle + i];
// reduce to a single unit
unsigned freeUnit = 0;
do {
freeUnit = freeUnits;
freeUnits = freeUnit & (freeUnit - 1);
} while (freeUnits);
assert(freeUnit && "No function unit available!");
Scoreboard[index] |= freeUnit;
Scoreboard[cycle + i] |= freeUnit;
}
// Advance the cycle to the next stage.
cycle += IS->getNextCycles();
}
DEBUG(dumpScoreboard());
DEBUG(Scoreboard.dump());
}
void ExactHazardRecognizer::AdvanceCycle() {
Scoreboard[ScoreboardHead] = 0;
ScoreboardHead = getFutureIndex(1);
Scoreboard[0] = 0;
Scoreboard.advance();
}