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Only mark remainder intervals as RS_Spill after per-block splitting.

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The local ranges created get to stay in the RS_New stage, just like for
local and region splitting.

This gives tryLocalSplit a bit more freedom the first time it sees one
of these new local ranges.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137001 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-08-05 23:50:31 +00:00
parent 1f8804263f
commit a9c41d39d1
1 changed files with 12 additions and 2 deletions
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14
lib/CodeGen/RegAllocGreedy.cpp
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@ -1227,12 +1227,22 @@ unsigned RAGreedy::tryBlockSplit(LiveInterval &VirtReg, AllocationOrder &Order,
return 0;
// We did split for some blocks.
SE->finish();
SmallVector<unsigned, 8> IntvMap;
SE->finish(&IntvMap);
// Tell LiveDebugVariables about the new ranges.
DebugVars->splitRegister(Reg, LREdit.regs());
setStage(NewVRegs.begin(), NewVRegs.end(), RS_Spill);
ExtraRegInfo.resize(MRI->getNumVirtRegs());
// Sort out the new intervals created by splitting. The remainder interval
// goes straight to spilling, the new local ranges get to stay RS_New.
for (unsigned i = 0, e = LREdit.size(); i != e; ++i) {
LiveInterval &LI = *LREdit.get(i);
if (getStage(LI) == RS_New && IntvMap[i] == 0)
setStage(LI, RS_Spill);
}
if (VerifyEnabled)
MF->verify(this, "After splitting live range around basic blocks");
return 0;