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Add live-ins to every BB. 

llvm-svn: 34342
This commit is contained in:
Evan Cheng 2007-02-16 09:05:02 +00:00
parent e1d2bcf8ce
commit 7238410766
1 changed files with 20 additions and 0 deletions
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20
llvm/lib/CodeGen/RegAllocLinearScan.cpp
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@ -291,6 +291,26 @@ void RA::linearScan()
i = IntervalPtrs::reverse_iterator(inactive_.erase(i.base()-1)); i = IntervalPtrs::reverse_iterator(inactive_.erase(i.base()-1));
} }
// A brute force way of adding live-ins to every BB.
for (MachineFunction::iterator MBB = mf_->begin(), E = mf_->end();
MBB != E; ++MBB) {
unsigned StartIdx = li_->getMBBStartIdx(MBB->getNumber());
for (IntervalPtrs::iterator i = fixed_.begin(), e = fixed_.end();
i != e; ++i)
if (i->first->liveAt(StartIdx))
MBB->addLiveIn(i->first->reg);
for (unsigned i = 0, e = handled_.size(); i != e; ++i) {
LiveInterval *HI = handled_[i];
if (HI->liveAt(StartIdx)) {
unsigned Reg = HI->reg;
if (MRegisterInfo::isVirtualRegister(Reg))
Reg = vrm_->getPhys(Reg);
MBB->addLiveIn(Reg);
}
}
}
DOUT << *vrm_; DOUT << *vrm_;
} }