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Fix compiler crash and profitability test in memset optimisation #22

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Fix compiler crash and profitability test in memset optimisation #22

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1d27eb6
Fix compiler crash on undefined alignment memset
Jul 24, 2023
0fa7ee2
Adapt memset heuristics and tests for targets with unaligned accesses
Jul 31, 2023
7da624f
Fix denominator check
Jul 31, 2023
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5 changes: 4 additions & 1 deletion llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
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Expand Up @@ -265,7 +265,10 @@ void MemsetRanges::addRange(int64_t Start, int64_t Size, Value *Ptr,
I->Start = Start;
I->StartPtr = Ptr;
I->Alignment = Alignment;
I->MaxAlignmentOffset = (I->MaxAlignmentOffset + Size) % I->MaxAlignment;
if (I->MaxAlignmentOffset != 0)
I->MaxAlignmentOffset = (I->MaxAlignmentOffset + Size) % I->MaxAlignment;
else
I->MaxAlignmentOffset = 0;
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}

// Does this store provide a better alignment than we have
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