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use valid bits to avoid unnecessary machine trace metric recomputations

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Although this does cut the number of traces recomputed by ~10% for the
test case mentioned in http://reviews.llvm.org/D10460, it doesn't
make a dent in the overall performance. That example needs to be more
selective when invalidating traces.

llvm-svn: 241393
This commit is contained in:
Sanjay Patel 2015-07-04 15:00:28 +00:00
parent 7c51289046
commit c0d734a9ee
1 changed files with 10 additions and 5 deletions
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9
lib/CodeGen/MachineTraceMetrics.cpp
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@ -1131,11 +1131,16 @@ computeInstrHeights(const MachineBasicBlock *MBB) {
MachineTraceMetrics::Trace
MachineTraceMetrics::Ensemble::getTrace(const MachineBasicBlock *MBB) {
// FIXME: Check cache tags, recompute as needed.
TraceBlockInfo &TBI = BlockInfo[MBB->getNumber()];
if (!TBI.hasValidDepth() || !TBI.hasValidHeight())
computeTrace(MBB);
if (!TBI.HasValidInstrDepths)
computeInstrDepths(MBB);
if (!TBI.HasValidInstrHeights)
computeInstrHeights(MBB);
return Trace(*this, BlockInfo[MBB->getNumber()]);
return Trace(*this, TBI);
}
unsigned