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Fix PR18572 - llc crash during GenericScheduler::initPolicy().

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Generalized the heuristic that looks at the (very rough) size of the
register file before enabling regpressure tracking.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199766 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2014-01-21 21:27:37 +00:00
parent ce5f07f33c
commit 10afb02d48
2 changed files with 30 additions and 4 deletions
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lib/CodeGen/MachineScheduler.cpp
+10 -4
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@@ -2531,10 +2531,16 @@ void GenericScheduler::initPolicy(MachineBasicBlock::iterator Begin,
// Avoid setting up the register pressure tracker for small regions to save
// compile time. As a rough heuristic, only track pressure when the number of
// schedulable instructions exceeds half the integer register file.
unsigned NIntRegs = Context->RegClassInfo->getNumAllocatableRegs(
TM.getTargetLowering()->getRegClassFor(MVT::i32));
RegionPolicy.ShouldTrackPressure = NumRegionInstrs > (NIntRegs / 2);
RegionPolicy.ShouldTrackPressure = true;
unsigned LegalIntVT = MVT::i32;
for (; LegalIntVT > (unsigned)MVT::i1; --LegalIntVT) {
if (TM.getTargetLowering()->isTypeLegal((MVT::SimpleValueType)LegalIntVT)) {
unsigned NIntRegs = Context->RegClassInfo->getNumAllocatableRegs(
TM.getTargetLowering()->getRegClassFor(
(MVT::SimpleValueType)LegalIntVT));
RegionPolicy.ShouldTrackPressure = NumRegionInstrs > (NIntRegs / 2);
}
}
// For generic targets, we default to bottom-up, because it's simpler and more
// compile-time optimizations have been implemented in that direction.