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Fix a couple of bugs where we considered physregs past their range as possibly

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intersecting an interval.

llvm-svn: 17939
This commit is contained in:
Chris Lattner 2004-11-18 04:33:31 +00:00
parent c23cebb206
commit e9ab36314d
1 changed files with 11 additions and 6 deletions
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17
lib/CodeGen/RegAllocLinearScan.cpp
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@ -145,6 +145,7 @@ bool RA::runOnMachineFunction(MachineFunction &fn) {
tm_ = &fn.getTarget();
mri_ = tm_->getRegisterInfo();
li_ = &getAnalysis<LiveIntervals>();
if (!prt_.get()) prt_.reset(new PhysRegTracker(*mri_));
vrm_.reset(new VirtRegMap(*mf_));
if (!spiller_.get()) spiller_.reset(createSpiller());
@ -393,12 +394,16 @@ void RA::assignRegOrStackSlotAtInterval(LiveInterval* cur)
for (unsigned i = 0, e = fixed_.size(); i != e; ++i) {
IntervalPtr &IP = fixed_[i];
LiveInterval *I = IP.first;
LiveInterval::iterator II = I->advanceTo(IP.second, StartPosition);
IP.second = II;
if (cur->overlapsFrom(*I, II)) {
unsigned reg = I->reg;
prt_->addRegUse(reg);
updateSpillWeights(reg, I->weight);
if (I->endNumber() > StartPosition) {
LiveInterval::iterator II = I->advanceTo(IP.second, StartPosition);
IP.second = II;
if (II != I->begin() && II->start > StartPosition)
--II;
if (cur->overlapsFrom(*I, II)) {
unsigned reg = I->reg;
prt_->addRegUse(reg);
updateSpillWeights(reg, I->weight);
}
}
}