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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
parent 92d0cd3c7c
commit 12cbefbee7
Notes: github-actions[bot] 2025-03-20 08:45:14 +00:00 
Author: https://github.com/ttrssreal
Commit: https://github.com/LadybirdBrowser/ladybird/commit/12cbefbee7b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3994
Reviewed-by: https://github.com/gmta ✅
9 changed files with 110 additions and 33 deletions
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Libraries/LibCrypto/BigInt/SignedBigInteger.h
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@@ -120,6 +120,7 @@ public:
[[nodiscard]] SignedBigInteger multiplied_by(SignedBigInteger const& other) const;
[[nodiscard]] SignedDivisionResult divided_by(SignedBigInteger const& divisor) const;
[[nodiscard]] ErrorOr<SignedBigInteger> mod_power_of_two(size_t power_of_two) const;
[[nodiscard]] ErrorOr<SignedBigInteger> try_shift_left(size_t num_bits) const;
[[nodiscard]] SignedBigInteger plus(UnsignedBigInteger const& other) const;