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

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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 22b4f05a21
commit 2c947a4fa0
1 changed files with 27 additions and 10 deletions
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37
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);
}
}
}