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Treat clones the same as their origin.

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When DCE clones a live range because it separates into connected components,
make sure that the clones enter the same register allocator stage as the
register they were cloned from.

For instance, clones may be split even when they where created during spilling.
Other registers created during spilling are not candidates for splitting or even
(re-)spilling.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128524 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-03-30 02:52:39 +00:00
parent 9f86e8054b
commit f22ca3fe5f
3 changed files with 29 additions and 6 deletions
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lib/CodeGen/LiveRangeEdit.cpp
+4 -1
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@@ -231,8 +231,11 @@ void LiveRangeEdit::eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead,
continue;
DEBUG(dbgs() << NumComp << " components: " << *LI << '\n');
SmallVector<LiveInterval*, 8> Dups(1, LI);
for (unsigned i = 1; i != NumComp; ++i)
for (unsigned i = 1; i != NumComp; ++i) {
Dups.push_back(&createFrom(LI->reg, LIS, VRM));
if (delegate_)
delegate_->LRE_DidCloneVirtReg(Dups.back()->reg, LI->reg);
}
ConEQ.Distribute(&Dups[0], VRM.getRegInfo());
}
}