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Fix the case where an instruction is not properly marked as using all registers that alias its inputs.

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llvm-svn: 57286
This commit is contained in:
Owen Anderson 2008-10-08 04:30:51 +00:00
parent 08e60cee90
commit 7f99714393
1 changed files with 19 additions and 1 deletions
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20
lib/CodeGen/RegAllocLocal.cpp
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@ -575,8 +575,26 @@ void RALocal::ComputeLocalLiveness(MachineBasicBlock& MBB) {
// them for later. Also, we have to process these
// _before_ processing the defs, since an instr
// uses regs before it defs them.
if (MO.isReg() && MO.getReg() && MO.isUse())
if (MO.isReg() && MO.getReg() && MO.isUse()) {
LastUseDef[MO.getReg()] = std::make_pair(I, i);
if (TargetRegisterInfo::isVirtualRegister(MO.getReg())) continue;
const unsigned* subregs = TRI->getAliasSet(MO.getReg());
if (subregs) {
while (*subregs) {
DenseMap<unsigned, std::pair<MachineInstr*, unsigned> >::iterator
alias = LastUseDef.find(*subregs);
if (alias != LastUseDef.end() &&
alias->second.first != I)
LastUseDef[*subregs] = std::make_pair(I, i);
++subregs;
}
}
}
}
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {