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LibCrypto+LibJS: Better bigint bitwise_and binop

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Bitwise and is defined in terms of two's complement, so some converting
needs to happen for SignedBigInteger's sign/magnitude representation to
work out.

UnsignedBigInteger::bitwise_not() is repurposed to convert all
high-order zero bits to ones up to a limit, for the two's complement
conversion to work.

Fixes test262/test/language/expressions/bitwise-and/bigint.js.
This commit is contained in:
Nico Weber
2022-01-17 19:54:02 -05:00
committed by Ali Mohammad Pur
parent 945d962322
commit 1f98639396
Notes: sideshowbarker 2024-07-17 20:40:16 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/1f986393964
Pull-request: https://github.com/SerenityOS/serenity/pull/11996
Reviewed-by: https://github.com/alimpfard
7 changed files with 52 additions and 23 deletions
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Userland/Libraries/LibCrypto/BigInt/Algorithms/UnsignedBigIntegerAlgorithms.h
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@@ -18,7 +18,7 @@ public:
static void bitwise_or_without_allocation(UnsignedBigInteger const& left, UnsignedBigInteger const& right, UnsignedBigInteger& output);
static void bitwise_and_without_allocation(UnsignedBigInteger const& left, UnsignedBigInteger const& right, UnsignedBigInteger& output);
static void bitwise_xor_without_allocation(UnsignedBigInteger const& left, UnsignedBigInteger const& right, UnsignedBigInteger& output);
static void bitwise_not_without_allocation(UnsignedBigInteger const& left, UnsignedBigInteger& output);
static void bitwise_not_fill_to_size_without_allocation(UnsignedBigInteger const& left, size_t, UnsignedBigInteger& output);
static void shift_left_without_allocation(UnsignedBigInteger const& number, size_t bits_to_shift_by, UnsignedBigInteger& temp_result, UnsignedBigInteger& temp_plus, UnsignedBigInteger& output);
static void multiply_without_allocation(UnsignedBigInteger const& left, UnsignedBigInteger const& right, UnsignedBigInteger& temp_shift_result, UnsignedBigInteger& temp_shift_plus, UnsignedBigInteger& temp_shift, UnsignedBigInteger& output);
static void divide_without_allocation(UnsignedBigInteger const& numerator, UnsignedBigInteger const& denominator, UnsignedBigInteger& temp_shift_result, UnsignedBigInteger& temp_shift_plus, UnsignedBigInteger& temp_shift, UnsignedBigInteger& temp_minus, UnsignedBigInteger& quotient, UnsignedBigInteger& remainder);