Commits on Dec 10, 2022

1. Investigate replacing double_conversion library with fast_float …

   https://bugs.webkit.org/show_bug.cgi?id=221178
   
   Reviewed by Sam Weinig.
   
   Parsing double numbers becomes 2x faster.
   
                                     ToT                     Patched
   
       json-parse-double      230.0022+-0.0838     ^    111.1297+-0.0983        ^ definitely 2.0697x faster
   
   Apple OSS approval for fast_float is OSS-4890.
   
   * Source/WTF/WTF.xcodeproj/project.pbxproj:
   * Source/WTF/wtf/CMakeLists.txt:
   * Source/WTF/wtf/FastFloat.cpp: Added.
   (WTF::parseDouble):
   * Source/WTF/wtf/FastFloat.h: Added.
   * Source/WTF/wtf/dtoa.h:
   * Source/WTF/wtf/fast_float/LICENSE: Added.
   * Source/WTF/wtf/fast_float/ascii_number.h: Added.
   (fast_float::byteswap):
   (fast_float::read_u64):
   (fast_float::write_u64):
   (fast_float::parse_eight_digits_unrolled):
   * Source/WTF/wtf/fast_float/bigint.h: Added.
   (fast_float::stackvec::stackvec):
   (fast_float::bigint::bigint):
   * Source/WTF/wtf/fast_float/decimal_to_binary.h: Added.
   (fast_float::compute_product_approximation):
   * Source/WTF/wtf/fast_float/digit_comparison.h: Added.
   * Source/WTF/wtf/fast_float/fast_float.h: Added.
   (fast_float::parse_options::parse_options):
   * Source/WTF/wtf/fast_float/fast_table.h: Added.
   * Source/WTF/wtf/fast_float/float_common.h: Added.
   (fast_float::fastfloat_strncasecmp):
   (fast_float::span::span):
   (fast_float::value128::value128):
   (fast_float::leading_zeroes):
   (fast_float::emulu):
   (fast_float::_umul128):
   (fast_float::full_multiplication):
   (fast_float::adjusted_mantissa::operator== const):
   (fast_float::adjusted_mantissa::operator!= const):
   (fast_float::binary_format<double>::mantissa_explicit_bits):
   (fast_float::binary_format<float>::mantissa_explicit_bits):
   (fast_float::binary_format<double>::max_exponent_round_to_even):
   (fast_float::binary_format<float>::max_exponent_round_to_even):
   (fast_float::binary_format<double>::min_exponent_round_to_even):
   (fast_float::binary_format<float>::min_exponent_round_to_even):
   (fast_float::binary_format<double>::minimum_exponent):
   (fast_float::binary_format<float>::minimum_exponent):
   (fast_float::binary_format<double>::infinite_power):
   (fast_float::binary_format<float>::infinite_power):
   (fast_float::binary_format<double>::sign_index):
   (fast_float::binary_format<float>::sign_index):
   (fast_float::binary_format<double>::min_exponent_fast_path):
   (fast_float::binary_format<float>::min_exponent_fast_path):
   (fast_float::binary_format<double>::max_exponent_fast_path):
   (fast_float::binary_format<float>::max_exponent_fast_path):
   (fast_float::binary_format<double>::max_mantissa_fast_path):
   (fast_float::binary_format<float>::max_mantissa_fast_path):
   (fast_float::binary_format<double>::exact_power_of_ten):
   (fast_float::binary_format<float>::exact_power_of_ten):
   (fast_float::binary_format<double>::largest_power_of_ten):
   (fast_float::binary_format<float>::largest_power_of_ten):
   (fast_float::binary_format<double>::smallest_power_of_ten):
   (fast_float::binary_format<float>::smallest_power_of_ten):
   (fast_float::binary_format<double>::max_digits):
   (fast_float::binary_format<float>::max_digits):
   (fast_float::binary_format<float>::exponent_mask):
   (fast_float::binary_format<double>::exponent_mask):
   (fast_float::binary_format<float>::mantissa_mask):
   (fast_float::binary_format<double>::mantissa_mask):
   (fast_float::binary_format<float>::hidden_bit_mask):
   (fast_float::binary_format<double>::hidden_bit_mask):
   (fast_float::to_float):
   * Source/WTF/wtf/fast_float/parse_number.h: Added.
   * Source/WTF/wtf/fast_float/simple_decimal_conversion.h: Added.
   (fast_float::detail::trim):
   (fast_float::detail::number_of_digits_decimal_left_shift):
   (fast_float::detail::round):
   (fast_float::detail::decimal_left_shift):
   (fast_float::detail::decimal_right_shift):
   (fast_float::compute_float):
   (fast_float::parse_long_mantissa):
   
   Canonical link: https://commits.webkit.org/257675@main

   

   Constellation committed Dec 10, 2022
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