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[ConstantFolding] Add folding for [de]interleave2, insert and extract #141301

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Merged
merged 8 commits into from
Jun 11, 2025
Merged

[ConstantFolding] Add folding for [de]interleave2, insert and extract #141301

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[ConstantFolding] Add folding for [de]interleave2, insert and extract
npanchen May 23, 2025
6a37fdc
Addressed comments
npanchen May 27, 2025
6c34f44
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npanchen May 28, 2025
1145582
Addressed latest comments
npanchen Jun 2, 2025
386bb29
Explicitly handle ConstantAggregateZero
npanchen Jun 10, 2025
77952a5
addressed comments
npanchen Jun 10, 2025
f64de79
Removed handling of invalid cases
npanchen Jun 11, 2025
ab1abeb
fixed typos
npanchen Jun 11, 2025
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32 changes: 20 additions & 12 deletions llvm/lib/Analysis/ConstantFolding.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3998,20 +3998,28 @@ ConstantFoldStructCall(StringRef Name, Intrinsic::ID IntrinsicID,
if (!Vec)
return nullptr;

unsigned NumElements =
cast<VectorType>(Vec->getType())->getElementCount().getKnownMinValue() /
2;
auto VecTy = cast<VectorType>(Vec->getType());
unsigned NumElements = VecTy->getElementCount().getKnownMinValue() / 2;

SmallVector<Constant *, 4> Res0(NumElements), Res1(NumElements);
for (unsigned I = 0; I < NumElements; ++I) {
Constant *Elt0 = Vec->getAggregateElement(2 * I);
Constant *Elt1 = Vec->getAggregateElement(2 * I + 1);
if (!Elt0 || !Elt1)
return nullptr;
Res0[I] = Elt0;
Res1[I] = Elt1;
if (isa<ConstantAggregateZero>(Vec)) {
auto *HalfVecTy = VectorType::getHalfElementsVectorType(VecTy);
return ConstantStruct::get(StTy, ConstantAggregateZero::get(HalfVecTy),
ConstantAggregateZero::get(HalfVecTy));
}
return ConstantStruct::get(StTy, ConstantVector::get(Res0),
ConstantVector::get(Res1));
if (isa<FixedVectorType>(Vec->getType())) {
for (unsigned I = 0; I < NumElements; ++I) {
Constant *Elt0 = Vec->getAggregateElement(2 * I);
Constant *Elt1 = Vec->getAggregateElement(2 * I + 1);
if (!Elt0 || !Elt1)
return nullptr;
Res0[I] = Elt0;
Res1[I] = Elt1;
}
return ConstantStruct::get(StTy, ConstantVector::get(Res0),
ConstantVector::get(Res1));
}
return nullptr;
}
default:
// TODO: Constant folding of vector intrinsics that fall through here does
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