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Also handle the situation where an indirect branch is the first (and last)

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instruction in a basic block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125116 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-02-08 21:46:11 +00:00
parent 8a61da8a68
commit d08d77318a
1 changed files with 8 additions and 6 deletions
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14
lib/CodeGen/RegAllocGreedy.cpp
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@ -808,16 +808,18 @@ void RAGreedy::splitAroundRegion(LiveInterval &VirtReg, unsigned PhysReg,
DEBUG(dbgs() << ", uses at " << BI.LastUse << " after split point "
<< BI.LastSplitPoint << ", stack-out.\n");
SlotIndex SegEnd;
if (BI.LastSplitPoint == Start)
// Find the last real instruction before the split point.
MachineBasicBlock::iterator SplitI =
LIS->getInstructionFromIndex(BI.LastSplitPoint);
MachineBasicBlock::iterator I = SplitI, B = BI.MBB->begin();
while (I != B && (--I)->isDebugValue())
;
if (I == SplitI)
SegEnd = SE.leaveIntvAtTop(*BI.MBB);
else {
MachineBasicBlock::iterator I =
LIS->getInstructionFromIndex(BI.LastSplitPoint);
do assert(I != BI.MBB->begin() && "Expected instruction");
while ((--I)->isDebugValue());
SegEnd = SE.leaveIntvAfter(LIS->getInstructionIndex(I));
SE.useIntv(Start, SegEnd);
}
SE.useIntv(Start, SegEnd);
// Run a double interval from the split to the last use.
// This makes it possible to spill the complement without affecting the
// indirect branch.