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Added a new "splitting" spiller.

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When a call is placed to spill an interval this spiller will first try to
break the interval up into its component values. Single value intervals and
intervals which have already been split (or are the result of previous splits)
are spilled by the default spiller.

Splitting intervals as described above may improve the performance of generated
code in some circumstances. This work is experimental however, and it still
miscompiles many benchmarks. It's not recommended for general use yet.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90951 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames
2009-12-09 05:39:12 +00:00
parent 164c7ba0ef
commit 6194569d22
6 changed files with 343 additions and 22 deletions
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4
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -401,7 +401,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
interval.removeRange(Start, End);
assert(interval.ranges.size() == 1 &&
"Newly discovered PHI interval has >1 ranges.");
MachineBasicBlock *killMBB = getMBBFromIndex(interval.endIndex());
MachineBasicBlock *killMBB = getMBBFromIndex(VNI->def);
VNI->addKill(indexes_->getTerminatorGap(killMBB));
VNI->setHasPHIKill(true);
DEBUG({
@ -412,7 +412,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// Replace the interval with one of a NEW value number. Note that this
// value number isn't actually defined by an instruction, weird huh? :)
LiveRange LR(Start, End,
interval.getNextValue(SlotIndex(getMBBStartIdx(mbb), true),
interval.getNextValue(SlotIndex(getMBBStartIdx(Killer->getParent()), true),
0, false, VNInfoAllocator));
LR.valno->setIsPHIDef(true);
DEBUG(errs() << " replace range with " << LR);