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Do not add empty live intervals to handled_. They should never be undone for backtracking. 

llvm-svn: 49544
This commit is contained in:
Evan Cheng 2008-04-11 17:55:47 +00:00
parent 33281864c1
commit 305d268ac3
1 changed files with 1 additions and 2 deletions
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3
llvm/lib/CodeGen/RegAllocLinearScan.cpp
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@ -519,7 +519,6 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
DOUT << tri_->getName(physReg) << '\n';
// Note the register is not really in use.
vrm_->assignVirt2Phys(cur->reg, physReg);
handled_.push_back(cur);
return;
}
@ -539,7 +538,7 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
if (vni->def && vni->def != ~1U && vni->def != ~0U) {
MachineInstr *CopyMI = li_->getInstructionFromIndex(vni->def);
unsigned SrcReg, DstReg;
if (tii_->isMoveInstr(*CopyMI, SrcReg, DstReg)) {
if (CopyMI && tii_->isMoveInstr(*CopyMI, SrcReg, DstReg)) {
unsigned Reg = 0;
if (TargetRegisterInfo::isPhysicalRegister(SrcReg))
Reg = SrcReg;