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Fix several bugs in the new fast-path:

Browse Source 
1) Remove an incorrect assertion.
  2) Set the stack slot weight properly.
  3) Resize the VirtRegMap when needed.

llvm-svn: 54949
This commit is contained in:
Owen Anderson 2008-08-18 21:20:32 +00:00
parent 2b4db92a29
commit 0c22b6d22c
1 changed files with 16 additions and 16 deletions
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32
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -1608,11 +1608,7 @@ std::vector<LiveInterval*> LiveIntervals::
addIntervalsForSpillsFast(const LiveInterval &li,
const MachineLoopInfo *loopInfo,
VirtRegMap &vrm, float& SSWeight) {
unsigned slot = vrm.assignVirt2StackSlot(li.reg);
// since this is called after the analysis is done we don't know if
// LiveVariables is available
lv_ = getAnalysisToUpdate<LiveVariables>();
vrm.assignVirt2StackSlot(li.reg);
std::vector<LiveInterval*> added;
@ -1628,14 +1624,17 @@ addIntervalsForSpillsFast(const LiveInterval &li,
DenseMap<MachineInstr*, unsigned> VRegMap;
DenseMap<MachineInstr*, VNInfo*> VNMap;
SSWeight = 0.0f;
for (MachineRegisterInfo::reg_iterator RI = mri_->reg_begin(li.reg),
RE = mri_->reg_end(); RI != RE; ) {
// Create a new virtual register for the spill interval.
MachineOperand& MO = RI.getOperand();
unsigned NewVReg = 0;
if (!VRegMap.count(MO.getParent()))
if (!VRegMap.count(MO.getParent())) {
VRegMap[MO.getParent()] = NewVReg = mri_->createVirtualRegister(rc);
else
vrm.grow();
} else
NewVReg = VRegMap[MO.getParent()];
// Increment iterator to avoid invalidation.
@ -1644,10 +1643,7 @@ addIntervalsForSpillsFast(const LiveInterval &li,
MO.setReg(NewVReg);
// create a new register for this spill
vrm.grow();
vrm.assignVirt2StackSlot(NewVReg, slot);
LiveInterval &nI = getOrCreateInterval(NewVReg);
assert(nI.empty());
// the spill weight is now infinity as it
// cannot be spilled again
@ -1672,17 +1668,21 @@ addIntervalsForSpillsFast(const LiveInterval &li,
}
added.push_back(&nI);
// update live variables if it is available
if (lv_)
lv_->addVirtualRegisterKilled(NewVReg, MO.getParent());
DOUT << "\t\t\t\tadded new interval: ";
DEBUG(nI.dump());
DOUT << '\n';
unsigned loopDepth = loopInfo->getLoopDepth(MO.getParent()->getParent());
if (HasUse) {
if (HasDef)
SSWeight += getSpillWeight(true, true, loopDepth);
else
SSWeight += getSpillWeight(false, true, loopDepth);
} else
SSWeight += getSpillWeight(true, false, loopDepth);
}
SSWeight = HUGE_VALF;
std::sort(added.begin(), added.end(), LISorter());