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Use the new predicate to control when we do prealloc splitting. Fix a small bug.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58738 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-11-05 00:32:13 +00:00
parent 4e20c5c30b
commit b214c6971b
1 changed files with 5 additions and 1 deletions
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6
lib/CodeGen/PreAllocSplitting.cpp
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@ -648,6 +648,10 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
if (DefMI && LIs->isReMaterializable(*LI, ValNo, DefMI))
return false;
// If this would create a new join point, do not split.
if (DefMI && createsNewJoin(LR, DefMI->getParent(), Barrier->getParent()))
return false;
// Find all references in the barrier mbb.
SmallPtrSet<MachineInstr*, 4> RefsInMBB;
for (MachineRegisterInfo::reg_iterator I = MRI->reg_begin(CurrLI->reg),
@ -862,7 +866,7 @@ bool PreAllocSplitting::createsNewJoin(LiveRange* LR,
Stack.push_back(std::make_pair(PredMBB, ++S));
continue;
} else
Stack.push_back(std::make_pair(PredMBB, ++S));
Stack.push_back(std::make_pair(PredMBB, S+1));
MachineBasicBlock* MBB = *S;
Visited.insert(MBB);