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Lazily defer duplicating the live interval we are splitting until we know it is

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necessary.

Sometimes, live range splitting doesn't shrink the current interval, but simply
changes some instructions to use a new interval. That makes the original more
suitable for spilling. In this case, we don't need to duplicate the original.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110481 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-08-06 22:17:33 +00:00
parent 4945dd8314
commit 5eb308b944
3 changed files with 70 additions and 53 deletions
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7
lib/CodeGen/InlineSpiller.cpp
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@ -113,9 +113,10 @@ bool InlineSpiller::split() {
splitAnalysis_.analyze(li_);
if (const MachineLoop *loop = splitAnalysis_.getBestSplitLoop()) {
SplitEditor(splitAnalysis_, lis_, vrm_, *newIntervals_)
.splitAroundLoop(loop);
return true;
// We can split, but li_ may be left intact with fewer uses.
if (SplitEditor(splitAnalysis_, lis_, vrm_, *newIntervals_)
.splitAroundLoop(loop))
return true;
}
return false;
}