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[LoopUnroll] Clamp PartialThreshold for large LoopMicroOpBufferSize #67657

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May 16, 2024
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[LoopUnroll] Clamp PartialThreshold for large LoopMicroOpBufferSize #67657

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8 changes: 7 additions & 1 deletion llvm/include/llvm/CodeGen/BasicTTIImpl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -610,7 +610,13 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
if (PartialUnrollingThreshold.getNumOccurrences() > 0)
MaxOps = PartialUnrollingThreshold;
else if (ST->getSchedModel().LoopMicroOpBufferSize > 0)
MaxOps = ST->getSchedModel().LoopMicroOpBufferSize;
// Upper bound by the default PartialThreshold, which is the same as
// the default full-unroll Threshold. Even if the loop micro-op buffer
// is very large, this does not mean that we want to unroll all loops
// to that length, as it would increase code size beyond the limits of
// what unrolling normally allows.
MaxOps = std::min(ST->getSchedModel().LoopMicroOpBufferSize,
UP.PartialThreshold);
else
return;

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