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Do a separate pass to compute spill weights because doing it inline 

with live intervals was missing registers that were used before they
were defined (in the arbitrary order live intervals numbers
instructions).

llvm-svn: 10603
This commit is contained in:
Alkis Evlogimenos 2003-12-24 15:44:53 +00:00
parent 4688edb69d
commit eeea81483f
1 changed files with 27 additions and 10 deletions
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37
llvm/lib/CodeGen/LiveIntervals.cpp
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@ -106,6 +106,33 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) {
computeIntervals();
// compute spill weights
const LoopInfo& loopInfo = getAnalysis<LoopInfo>();
for (MbbIndex2MbbMap::iterator
it = mbbi2mbbMap_.begin(), itEnd = mbbi2mbbMap_.end();
it != itEnd; ++it) {
MachineBasicBlock* mbb = it->second;
unsigned loopDepth = loopInfo.getLoopDepth(mbb->getBasicBlock());
for (MachineBasicBlock::iterator mi = mbb->begin(), miEnd = mbb->end();
mi != miEnd; ++mi) {
MachineInstr* instr = *mi;
for (int i = instr->getNumOperands() - 1; i >= 0; --i) {
MachineOperand& mop = instr->getOperand(i);
if (!mop.isVirtualRegister())
continue;
unsigned reg = mop.getAllocatedRegNum();
Reg2IntervalMap::iterator r2iit = r2iMap_.find(reg);
assert(r2iit != r2iMap_.end());
intervals_[r2iit->second].weight += pow(10.0F, loopDepth);
}
}
}
return true;
}
@ -255,8 +282,6 @@ void LiveIntervals::computeIntervals()
{
DEBUG(std::cerr << "computing live intervals:\n");
const LoopInfo& loopInfo = getAnalysis<LoopInfo>();
for (MbbIndex2MbbMap::iterator
it = mbbi2mbbMap_.begin(), itEnd = mbbi2mbbMap_.end();
it != itEnd; ++it) {
@ -264,8 +289,6 @@ void LiveIntervals::computeIntervals()
DEBUG(std::cerr << "machine basic block: "
<< mbb->getBasicBlock()->getName() << "\n");
unsigned loopDepth = loopInfo.getLoopDepth(mbb->getBasicBlock());
for (MachineBasicBlock::iterator mi = mbb->begin(), miEnd = mbb->end();
mi != miEnd; ++mi) {
MachineInstr* instr = *mi;
@ -296,12 +319,6 @@ void LiveIntervals::computeIntervals()
else
handleVirtualRegisterDef(mbb, mi, reg);
}
// update weights
Reg2IntervalMap::iterator r2iit = r2iMap_.find(reg);
if (r2iit != r2iMap_.end() &&
reg >= MRegisterInfo::FirstVirtualRegister)
intervals_[r2iit->second].weight += pow(10.0F, loopDepth);
}
}
}