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Don't accidentally leave small gaps in the live ranges when leaving the active

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interval after an instruction. The leaveIntvAfter() method only adds liveness
from the instruction's boundary index to the inserted copy.

Ideally, SplitKit should be smarter about this, perhaps by combining useIntv()
and leaveIntvAfter() into one method that guarantees continuity.

llvm-svn: 123858
This commit is contained in:
Jakob Stoklund Olesen 2011-01-19 23:14:56 +00:00
parent 868d2877dc
commit c47bd85657
1 changed files with 3 additions and 2 deletions
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5
lib/CodeGen/RegAllocGreedy.cpp
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@ -757,7 +757,7 @@ void RAGreedy::splitAroundRegion(LiveInterval &VirtReg, unsigned PhysReg,
}
if (!BI.LiveThrough) {
DEBUG(dbgs() << ", killed in block.\n");
SE.useIntv(Start, BI.Kill);
SE.useIntv(Start, BI.Kill.getBoundaryIndex());
SE.leaveIntvAfter(BI.Kill);
continue;
}
@ -765,7 +765,7 @@ void RAGreedy::splitAroundRegion(LiveInterval &VirtReg, unsigned PhysReg,
// Block is live-through, but exit bundle is on the stack.
// Spill immediately after the last use.
DEBUG(dbgs() << ", uses, stack-out.\n");
SE.useIntv(Start, BI.LastUse);
SE.useIntv(Start, BI.LastUse.getBoundaryIndex());
SE.leaveIntvAfter(BI.LastUse);
continue;
}
@ -789,6 +789,7 @@ void RAGreedy::splitAroundRegion(LiveInterval &VirtReg, unsigned PhysReg,
SlotIndex Use = std::lower_bound(SA->UseSlots.begin(), SA->UseSlots.end(),
IP.second)[-1];
DEBUG(dbgs() << ", free use at " << Use << ".\n");
Use = Use.getBoundaryIndex();
assert(Use >= BI.FirstUse && Use < IP.first);
SE.useIntv(Start, Use);
SE.leaveIntvAfter(Use);