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If a livein is not used in the block. It's live through. 

llvm-svn: 37764
This commit is contained in:
Evan Cheng 2007-06-27 18:47:28 +00:00
parent 77f541ddfd
commit df0c705d7d
1 changed files with 8 additions and 5 deletions
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13
llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -625,13 +625,15 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
exit:
// Live-in register might not be used at all.
if (end == MIIdx) {
DOUT << " dead";
if (isAlias)
if (isAlias) {
DOUT << " dead";
end = getDefIndex(MIIdx) + 1;
} else {
DOUT << " live through";
end = baseIndex;
}
}
assert(start < end && "did not find end of interval?");
LiveRange LR(start, end, interval.getNextValue(~0U, 0));
DOUT << " +" << LR << '\n';
interval.addRange(LR);
@ -662,7 +664,8 @@ void LiveIntervals::computeIntervals() {
// Multiple live-ins can alias the same register.
for (const unsigned* AS = mri_->getSubRegisters(*LI); *AS; ++AS)
if (!hasInterval(*AS))
handleLiveInRegister(MBB, MIIndex, getOrCreateInterval(*AS), true);
handleLiveInRegister(MBB, MIIndex, getOrCreateInterval(*AS),
true);
}
}