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Ignore the cloning of unknown registers.

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THe LRE_DidCloneVirtReg callback may be called with vitual registers
that RAGreedy doesn't even know about yet.  In that case, there are no
data structures to update.

llvm-svn: 139702
This commit is contained in:
Jakob Stoklund Olesen 2011-09-14 17:34:37 +00:00
parent b08f6dc724
commit 44b1ea8bae
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/RegAllocGreedy.cpp
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@ -377,6 +377,10 @@ void RAGreedy::LRE_WillShrinkVirtReg(unsigned VirtReg) {
}
void RAGreedy::LRE_DidCloneVirtReg(unsigned New, unsigned Old) {
// Cloning a register we haven't even heard about yet? Just ignore it.
if (!ExtraRegInfo.inBounds(Old))
return;
// LRE may clone a virtual register because dead code elimination causes it to
// be split into connected components. The new components are much smaller
// than the original, so they should get a new chance at being assigned.