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Fix coloring bug when mapping values in the middle of a live-through block.

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If the found value is not live-through the block, we should only add liveness up
to the requested slot index. When the value is live-through, the whole block
should be colored.

Bug found by SSA verification in the machine code verifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124812 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-02-03 20:29:36 +00:00
parent 207c868c92
commit 08eb8dd616
1 changed files with 7 additions and 7 deletions
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14
lib/CodeGen/SplitKit.cpp
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@ -607,14 +607,14 @@ VNInfo *LiveIntervalMap::mapValue(const VNInfo *ParentVNI, SlotIndex Idx,
for (unsigned i = 0, e = LiveIn.size(); i != e; ++i) {
MachineBasicBlock *MBB = LiveIn[i]->getBlock();
SlotIndex Start = LIS.getMBBStartIdx(MBB);
if (MBB == IdxMBB) {
LI->addRange(LiveRange(Start, Idx.getNextSlot(), IdxVNI));
continue;
}
// Anything in LiveIn other than IdxMBB is live-through.
VNInfo *VNI = LiveOutCache.lookup(MBB).first;
assert(VNI && "Missing block value");
LI->addRange(LiveRange(Start, LIS.getMBBEndIdx(MBB), VNI));
// Anything in LiveIn other than IdxMBB is live-through.
// In IdxMBB, we should stop at Idx unless the same value is live-out.
if (MBB == IdxMBB && IdxVNI != VNI)
LI->addRange(LiveRange(Start, Idx.getNextSlot(), IdxVNI));
else
LI->addRange(LiveRange(Start, LIS.getMBBEndIdx(MBB), VNI));
}
return IdxVNI;