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Handle the special case of registers begin redefined by early-clobber defs.

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In this case, the value need to be available at the load index instead of the
normal use index.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127167 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-03-07 18:56:16 +00:00
parent 6154f6c929
commit a9d5c2715b
1 changed files with 7 additions and 0 deletions
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7
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -779,6 +779,13 @@ void LiveIntervals::shrinkToUses(LiveInterval *li) {
if (VNI->isUnused())
continue;
NewLI.addRange(LiveRange(VNI->def, VNI->def.getNextSlot(), VNI));
// A use tied to an early-clobber def ends at the load slot and isn't caught
// above. Catch it here instead. This probably only ever happens for inline
// assembly.
if (VNI->def.isUse())
if (VNInfo *UVNI = li->getVNInfoAt(VNI->def.getLoadIndex()))
WorkList.push_back(std::make_pair(VNI->def.getLoadIndex(), UVNI));
}
// Keep track of the PHIs that are in use.