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LibJS+LibCrypto: Use a bitwise approach for BigInt's as*IntN methods

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This speeds up expressions such as `BigInt.asIntN(0x4000000000000, 1n)`
(#3615). And those involving very large bigints.
This commit is contained in:
Jess 2025-03-19 10:31:39 +13:00 • committed by Jelle Raaijmakers
commit 12cbefbee7
Notes: github-actions[bot] 2025-03-20 08:45:14 +00:00
9 changed files with 110 additions and 33 deletions
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Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
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@ -117,9 +117,11 @@ public:
[[nodiscard]] UnsignedBigInteger bitwise_not_fill_to_one_based_index(size_t) const;
[[nodiscard]] UnsignedBigInteger shift_left(size_t num_bits) const;
[[nodiscard]] UnsignedBigInteger shift_right(size_t num_bits) const;
[[nodiscard]] UnsignedBigInteger as_n_bits(size_t n) const;
[[nodiscard]] UnsignedBigInteger multiplied_by(UnsignedBigInteger const& other) const;
[[nodiscard]] UnsignedDivisionResult divided_by(UnsignedBigInteger const& divisor) const;
[[nodiscard]] ErrorOr<UnsignedBigInteger> try_bitwise_not_fill_to_one_based_index(size_t) const;
[[nodiscard]] ErrorOr<UnsignedBigInteger> try_shift_left(size_t num_bits) const;
[[nodiscard]] u32 hash() const;