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Cap descriptor width to 64 bytes in FindChild. #3443

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Merged
copybara-service merged 1 commit into from
Oct 2, 2026
Merged

Cap descriptor width to 64 bytes in FindChild. #3443

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5 changes: 4 additions & 1 deletion hwy/contrib/btree/btree-inl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -549,7 +549,10 @@ HWY_INLINE size_t FindChild(const InternalNode<KeyT>* HWY_RESTRICT internal,
typename InternalNode<KeyT>::StorageKeyT target) {
using StorageKeyT = typename InternalNode<KeyT>::StorageKeyT;
constexpr size_t kCapacity = InternalNode<KeyT>::kCapacity;
const CappedTag<StorageKeyT, kCapacity> d;
// Cap vectors at 64 bytes: InternalNode is only alignas(64), so a wider
// vector (possible on scalable targets) would make the aligned Load below
// unsafe.
const CappedTag<StorageKeyT, 64 / sizeof(StorageKeyT)> d;
const size_t N = Lanes(d);
const auto v_target = Set(d, target);

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