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Fix one more case of splitting after the last split point.

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llvm-svn: 125137
This commit is contained in:
Jakob Stoklund Olesen 2011-02-08 23:26:48 +00:00
parent 3da2844610
commit 3433de2114
1 changed files with 10 additions and 8 deletions
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18
lib/CodeGen/RegAllocGreedy.cpp
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@ -746,8 +746,7 @@ void RAGreedy::splitAroundRegion(LiveInterval &VirtReg, unsigned PhysReg,
continue;
}
if (IP.second.getBoundaryIndex() < BI.LastUse &&
IP.second.getBoundaryIndex() <= BI.LastSplitPoint) {
if (IP.second.getBoundaryIndex() < BI.LastUse) {
// There are interference-free uses at the end of the block.
// Find the first use that can get the live-out register.
SmallVectorImpl<SlotIndex>::const_iterator UI =
@ -755,13 +754,16 @@ void RAGreedy::splitAroundRegion(LiveInterval &VirtReg, unsigned PhysReg,
IP.second.getBoundaryIndex());
assert(UI != SA->UseSlots.end() && "Couldn't find last use");
SlotIndex Use = *UI;
DEBUG(dbgs() << ", free use at " << Use << ".\n");
assert(Use <= BI.LastUse && "Couldn't find last use");
SlotIndex SegStart = SE.enterIntvBefore(Use);
assert(SegStart >= IP.second && "Couldn't avoid interference");
assert(SegStart < BI.LastSplitPoint && "Impossible split point");
SE.useIntv(SegStart, Stop);
continue;
// Only attempt a split befroe the last split point.
if (Use.getBaseIndex() <= BI.LastSplitPoint) {
DEBUG(dbgs() << ", free use at " << Use << ".\n");
SlotIndex SegStart = SE.enterIntvBefore(Use);
assert(SegStart >= IP.second && "Couldn't avoid interference");
assert(SegStart < BI.LastSplitPoint && "Impossible split point");
SE.useIntv(SegStart, Stop);
continue;
}
}
// Interference is after the last use.