Add page aware implementation of an array.#7
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Add page aware implementation of an array.#7mijovic wants to merge 1 commit intocategory-labs:mainfrom
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mijovic
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| /// belongs to a page via: | ||
| /// | ||
| /// page_index(slot) = slot >> 7 | ||
| /// offset(slot) = slot & 0x7F | ||
| /// | ||
| /// Once any slot on a page is accessed, all subsequent SLOAD/SSTORE on | ||
| /// that page are charged at warm cost. This library exploits that property | ||
| /// by aligning the array base to a 128-slot page boundary: | ||
| /// | ||
| /// base = and(keccak256(arr.slot), not(0x7f)) — clears low 7 bits | ||
| /// | ||
| /// base + 0 → length | ||
| /// base + 1 → arr[0] | ||
| /// base + 2 → arr[1] | ||
| /// ... | ||
| /// base + N → arr[N-1] | ||
| /// | ||
| /// Crucially, the length is stored at `base + 0` — on the same page as | ||
| /// the data — rather than at `arr.slot` (as a native Solidity array would). |
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Ideally we leverage mip-8 for arrays that use second page too, giving that this optimize only when manipulating first 127 items, then it behave with cold cost on second page(as mentioned in Slack)
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