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Use alloca size instead number of element as the cutoff for promoting loop unrolling

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Use alloca size instead number of element as the cutoff for promoting loop unrolling
This commit is contained in:
Liou, Jhe-Yu
2025-08-22 17:34:55 +00:00
committed by igcbot
parent 8ae6734b82
commit cd5c825d4d
1 changed files with 4 additions and 3 deletions
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7
IGC/Compiler/GenTTI.cpp
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@ -344,12 +344,13 @@ void GenIntrinsicsTTIImpl::getUnrollingPreferences(Loop *L, ScalarEvolution &SE,
// TODO: Can a alloca with a fixed size not reside in the entry block?
if (!AI->isStaticAlloca())
continue;
// Assume every iteration consumes 1 alloca element.
if (cast<ConstantInt>(AI->getArraySize())->getZExtValue() > UnrollMaxCountForAlloca)
continue;
// Using alloca size in bytes as the threshold boost seems a bit tricky.
unsigned AllocaSize = *(AI->getAllocationSizeInBits(DL)) / 8;
// Assume every iteration consumes 1 DW (64 bytes).
if (AllocaSize/8 > UnrollMaxCountForAlloca)
continue;
ThresholdBoost += AllocaSize;
if (GEP)
isGEPLoopInduction[GEP] = true;