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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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11
Libraries/LibCrypto/BigInt/SignedBigInteger.cpp
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@@ -291,6 +291,17 @@ FLATTEN SignedBigInteger SignedBigInteger::shift_right(size_t num_bits) const
return SignedBigInteger { m_unsigned_data.shift_right(num_bits), m_sign };
}
FLATTEN ErrorOr<SignedBigInteger> SignedBigInteger::mod_power_of_two(size_t power_of_two) const
{
auto const lower_bits = m_unsigned_data.as_n_bits(power_of_two);
if (is_positive())
return SignedBigInteger(lower_bits);
// twos encode lower bits
return SignedBigInteger(TRY(lower_bits.try_bitwise_not_fill_to_one_based_index(power_of_two)).plus(1).as_n_bits(power_of_two));
}
FLATTEN SignedBigInteger SignedBigInteger::multiplied_by(SignedBigInteger const& other) const
{
bool result_sign = m_sign ^ other.m_sign;