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Stop precomputing last split points, query the SplitAnalysis cache on demand.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128875 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-04-05 04:20:29 +00:00
parent 1a7744501a
commit 612f7807c5
3 changed files with 17 additions and 21 deletions
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lib/CodeGen/SplitKit.cpp
+4 -9
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@@ -151,12 +151,6 @@ bool SplitAnalysis::calcLiveBlockInfo() {
SlotIndex Start, Stop;
tie(Start, Stop) = LIS.getSlotIndexes()->getMBBRange(BI.MBB);
// The last split point is the latest possible insertion point that dominates
// all successor blocks. If interference reaches LastSplitPoint, it is not
// possible to insert a split or reload that makes CurLI live in the
// outgoing bundle.
BI.LastSplitPoint = getLastSplitPoint(BI.MBB->getNumber());
// LVI is the first live segment overlapping MBB.
BI.LiveIn = LVI->start <= Start;
if (!BI.LiveIn)
@@ -947,13 +941,14 @@ void SplitEditor::splitSingleBlocks(const SplitAnalysis::BlockPtrSet &Blocks) {
continue;
openIntv();
SlotIndex LastSplitPoint = SA.getLastSplitPoint(BI.MBB->getNumber());
SlotIndex SegStart = enterIntvBefore(std::min(BI.FirstUse,
BI.LastSplitPoint));
if (!BI.LiveOut || BI.LastUse < BI.LastSplitPoint) {
LastSplitPoint));
if (!BI.LiveOut || BI.LastUse < LastSplitPoint) {
useIntv(SegStart, leaveIntvAfter(BI.LastUse));
} else {
// The last use is after the last valid split point.
SlotIndex SegStop = leaveIntvBefore(BI.LastSplitPoint);
SlotIndex SegStop = leaveIntvBefore(LastSplitPoint);
useIntv(SegStart, SegStop);
overlapIntv(SegStop, BI.LastUse);
}