mirror of
https://github.com/LadybirdBrowser/ladybird.git
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2254 lines
93 KiB
C++
2254 lines
93 KiB
C++
/*
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* Copyright (c) 2022, David Tuin <davidot@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/CharacterTypes.h>
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#include <AK/FloatingPointStringConversions.h>
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#include <AK/Format.h>
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#include <AK/ScopeGuard.h>
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#include <AK/StringView.h>
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#include <AK/UFixedBigInt.h>
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namespace AK {
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// This entire algorithm is an implementation of the paper: Number Parsing at a Gigabyte per Second
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// by Daniel Lemire, available at https://arxiv.org/abs/2101.11408 and an implementation
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// at https://github.com/fastfloat/fast_float
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// There is also a perhaps more easily understandable explanation
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// at https://nigeltao.github.io/blog/2020/eisel-lemire.html
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template<typename T>
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concept ParseableFloatingPoint = IsFloatingPoint<T> && (sizeof(T) == sizeof(u32) || sizeof(T) == sizeof(u64));
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template<ParseableFloatingPoint T>
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struct FloatingPointInfo {
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static_assert(sizeof(T) == sizeof(u64) || sizeof(T) == sizeof(u32));
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using SameSizeUnsigned = Conditional<sizeof(T) == sizeof(u64), u64, u32>;
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// Implementing just this gives all the other bit sizes and mask immediately.
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static constexpr inline i32 mantissa_bits()
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{
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if constexpr (sizeof(T) == sizeof(u64))
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return 52;
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return 23;
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}
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static constexpr inline i32 exponent_bits()
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{
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return sizeof(T) * 8u - 1u - mantissa_bits();
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}
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static constexpr inline i32 exponent_bias()
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{
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return (1 << (exponent_bits() - 1)) - 1;
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}
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static constexpr inline i32 minimum_exponent()
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{
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return -exponent_bias();
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}
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static constexpr inline i32 infinity_exponent()
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{
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static_assert(exponent_bits() < 31);
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return (1 << exponent_bits()) - 1;
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}
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static constexpr inline i32 sign_bit_index()
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{
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return sizeof(T) * 8 - 1;
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}
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static constexpr inline SameSizeUnsigned sign_mask()
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{
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return SameSizeUnsigned { 1 } << sign_bit_index();
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}
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static constexpr inline SameSizeUnsigned mantissa_mask()
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{
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return (SameSizeUnsigned { 1 } << mantissa_bits()) - 1;
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}
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static constexpr inline SameSizeUnsigned exponent_mask()
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{
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return SameSizeUnsigned { infinity_exponent() } << mantissa_bits();
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}
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static constexpr inline i32 max_exponent_round_to_even()
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{
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if constexpr (sizeof(T) == sizeof(u64))
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return 23;
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return 10;
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}
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static constexpr inline i32 min_exponent_round_to_even()
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{
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if constexpr (sizeof(T) == sizeof(u64))
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return -4;
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return -17;
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}
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static constexpr inline size_t max_possible_digits_needed_for_parsing()
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{
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if constexpr (sizeof(T) == sizeof(u64))
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return 769;
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return 114;
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}
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static constexpr inline i32 max_power_of_10()
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{
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if constexpr (sizeof(T) == sizeof(u64))
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return 308;
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return 38;
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}
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static constexpr inline i32 min_power_of_10()
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{
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// Closest double value to zero is xe-324 and since we have at most 19 digits
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// we know that -324 -19 = -343 so exponent below that must be zero (for double)
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if constexpr (sizeof(T) == sizeof(u64))
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return -342;
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return -65;
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}
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static constexpr inline i32 max_exact_power_of_10()
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{
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// These are the largest power of 10 representable in T
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// So all powers of 10*i less than or equal to this should be the exact
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// values, be careful as they can be above "safe integer" limits.
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if constexpr (sizeof(T) == sizeof(u64))
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return 22;
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return 10;
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}
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static constexpr inline T power_of_ten(i32 exponent)
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{
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VERIFY(exponent <= max_exact_power_of_10());
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VERIFY(exponent >= 0);
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return m_powers_of_ten_stored[exponent];
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}
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template<u32 MaxPower>
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static constexpr inline Array<T, MaxPower + 1> compute_powers_of_ten()
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{
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// All these values are guaranteed to be exact all powers of MaxPower is the
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Array<T, MaxPower + 1> values {};
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values[0] = T(1.0);
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T ten = T(10.);
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for (u32 i = 1; i <= MaxPower; ++i)
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values[i] = values[i - 1] * ten;
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return values;
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}
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static constexpr auto m_powers_of_ten_stored = compute_powers_of_ten<max_exact_power_of_10()>();
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};
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template<typename T>
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using BitSizedUnsignedForFloatingPoint = typename FloatingPointInfo<T>::SameSizeUnsigned;
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struct BasicParseResult {
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u64 mantissa = 0;
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i64 exponent = 0;
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bool valid = false;
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bool negative = false;
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bool more_than_19_digits_with_overflow = false;
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char const* last_parsed { nullptr };
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StringView whole_part;
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StringView fractional_part;
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};
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static constexpr auto max_representable_power_of_ten_in_u64 = 19;
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static_assert(1e19 <= static_cast<double>(NumericLimits<u64>::max()));
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static_assert(1e20 >= static_cast<double>(NumericLimits<u64>::max()));
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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# error Float parsing currently assumes little endian, this fact is only used in fast parsing of 8 digits at a time \
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you _should_ only need to change read eight_digits to make this big endian compatible.
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#endif
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constexpr u64 read_eight_digits(char const* string)
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{
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u64 val;
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__builtin_memcpy(&val, string, sizeof(val));
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return val;
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}
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constexpr static bool has_eight_digits(u64 value)
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{
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// The ascii digits 0-9 are hex 0x30 - 0x39
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// If x is within that range then y := x + 0x46 is 0x76 to 0x7f
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// z := x - 0x30 is 0x00 - 0x09
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// y | z = 0x7t where t is in the range 0 - f so doing & 0x80 gives 0
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// However if a character x is below 0x30 then x - 0x30 underflows setting
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// the 0x80 bit of the next digit meaning & 0x80 will never be 0.
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// Similarly if a character x is above 0x39 then x + 0x46 gives at least
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// 0x80 thus & 0x80 will not be zero.
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return (((value + 0x4646464646464646) | (value - 0x3030303030303030)) & 0x8080808080808080) == 0;
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}
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constexpr static u32 eight_digits_to_value(u64 value)
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{
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// THIS DOES ABSOLUTELY ASSUME has_eight_digits is true
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// This trick is based on https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
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// FIXME: fast_float uses a slightly different version, but that is far harder
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// to understand and does not seem to improve performance substantially.
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// See https://github.com/fastfloat/fast_float/pull/28
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// First convert the digits to their respectively numbers (0x30 -> 0x00 etc.)
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value -= 0x3030303030303030;
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// Because of little endian the first number will in fact be the least significant
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// bits of value i.e. "12345678" -> 0x0807060504030201
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// This means that we need to shift/multiply each digit with 8 - the byte it is in
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// So the eight need to go down, and the 01 need to be multiplied with 10000000
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// We effectively multiply by 10 and then shift those values to the right (2^8 = 256)
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// We then shift the values back down, this leads to 4 digits pairs in the 2 byte parts
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// The values between are "garbage" which we will ignore
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value = (value * (256 * 10 + 1)) >> 8;
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// So with our example this gives 0x$$4e$$38$$22$$0c, where $$ is garbage/ignored
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// In decimal this gives 78 56 34 12
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// Now we keep performing the same trick twice more
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// First * 100 and shift of 16 (2^16 = 65536) and then shift back
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value = ((value & 0x00FF00FF00FF00FF) * (65536 * 100 + 1)) >> 16;
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// Again with our example this gives 0x$$$$162e$$$$04d2
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// 5678 1234
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// And finally with * 10000 and shift of 32 (2^32 = 4294967296)
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value = ((value & 0x0000FFFF0000FFFF) * (4294967296 * 10000 + 1)) >> 32;
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// With the example this gives 0x$$$$$$$$00bc614e
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// 12345678
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// Now we just truncate to the lower part
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return u32(value);
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}
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template<typename IsDoneCallback, typename Has8CharsLeftCallback>
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static BasicParseResult parse_numbers(char const* start, IsDoneCallback is_done, Has8CharsLeftCallback has_eight_chars_to_read)
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{
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char const* ptr = start;
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BasicParseResult result {};
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if (start == nullptr || is_done(ptr))
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return result;
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if (*ptr == '-' || *ptr == '+') {
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result.negative = *ptr == '-';
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++ptr;
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if (is_done(ptr) || (!is_ascii_digit(*ptr) && *ptr != '.'))
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return result;
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}
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auto const fast_parse_decimal = [&](auto& value) {
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while (has_eight_chars_to_read(ptr) && has_eight_digits(read_eight_digits(ptr))) {
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value = 100'000'000 * value + eight_digits_to_value(read_eight_digits(ptr));
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ptr += 8;
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}
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while (!is_done(ptr) && is_ascii_digit(*ptr)) {
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value = 10 * value + (*ptr - '0');
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++ptr;
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}
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};
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u64 mantissa = 0;
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auto const* whole_part_start = ptr;
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fast_parse_decimal(mantissa);
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auto const* whole_part_end = ptr;
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auto digits_found = whole_part_end - whole_part_start;
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result.whole_part = StringView(whole_part_start, digits_found);
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i64 exponent = 0;
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auto const* start_of_fractional_part = ptr;
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if (!is_done(ptr) && *ptr == '.') {
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++ptr;
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++start_of_fractional_part;
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fast_parse_decimal(mantissa);
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// We parsed x digits after the dot so need to multiply with 10^-x
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exponent = -(ptr - start_of_fractional_part);
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}
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result.fractional_part = StringView(start_of_fractional_part, ptr - start_of_fractional_part);
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digits_found += -exponent;
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// If both the part
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if (digits_found == 0)
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return result;
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i64 explicit_exponent = 0;
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// We do this in a lambda to easily be able to get out of parsing the exponent
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// and resetting the final character read to before the 'e'.
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[&] {
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if (is_done(ptr))
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return;
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if (*ptr != 'e' && *ptr != 'E')
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return;
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auto* pointer_before_e = ptr;
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ArmedScopeGuard reset_ptr { [&] { ptr = pointer_before_e; } };
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++ptr;
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if (is_done(ptr))
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return;
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bool negative_exponent = false;
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if (*ptr == '-' || *ptr == '+') {
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negative_exponent = *ptr == '-';
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++ptr;
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if (is_done(ptr))
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return;
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}
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if (!is_ascii_digit(*ptr))
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return;
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// Now we must have an optional sign and at least one digit so we
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// will not reset
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reset_ptr.disarm();
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while (!is_done(ptr) && is_ascii_digit(*ptr)) {
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// A massive exponent is not really a problem as this would
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// require a lot of characters so we would fallback on precise
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// parsing anyway (this is already 268435456 digits or 10 megabytes of digits)
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if (explicit_exponent < 0x10'000'000)
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explicit_exponent = 10 * explicit_exponent + (*ptr - '0');
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++ptr;
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}
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explicit_exponent = negative_exponent ? -explicit_exponent : explicit_exponent;
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exponent += explicit_exponent;
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}();
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result.valid = true;
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result.last_parsed = ptr;
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if (digits_found > max_representable_power_of_ten_in_u64) {
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// There could be overflow but because we just count the digits it could be leading zeros
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auto const* leading_digit = whole_part_start;
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while (!is_done(leading_digit) && (*leading_digit == '0' || *leading_digit == '.')) {
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if (*leading_digit == '0')
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--digits_found;
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++leading_digit;
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}
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if (digits_found > max_representable_power_of_ten_in_u64) {
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// FIXME: We just removed leading zeros, we might be able to skip these easily again.
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// If removing the leading zeros does not help we reparse and keep just the significant digits
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result.more_than_19_digits_with_overflow = true;
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mantissa = 0;
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constexpr i64 smallest_nineteen_digit_number = { 1000000000000000000 };
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char const* reparse_ptr = whole_part_start;
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constexpr i64 smallest_eleven_digit_number = { 10000000000 };
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while (mantissa < smallest_eleven_digit_number && (whole_part_end - reparse_ptr) >= 8) {
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mantissa = 100'000'000 * mantissa + eight_digits_to_value(read_eight_digits(reparse_ptr));
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reparse_ptr += 8;
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}
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while (mantissa < smallest_nineteen_digit_number && reparse_ptr != whole_part_end) {
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mantissa = 10 * mantissa + (*reparse_ptr - '0');
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++reparse_ptr;
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}
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if (mantissa >= smallest_nineteen_digit_number) {
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// We still needed to parse (whole_part_end - reparse_ptr) digits so scale the exponent
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exponent = explicit_exponent + (whole_part_end - reparse_ptr);
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} else {
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reparse_ptr = start_of_fractional_part;
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char const* fractional_end = result.fractional_part.characters_without_null_termination() + result.fractional_part.length();
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while (mantissa < smallest_eleven_digit_number && (fractional_end - reparse_ptr) >= 8) {
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mantissa = 100'000'000 * mantissa + eight_digits_to_value(read_eight_digits(reparse_ptr));
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reparse_ptr += 8;
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}
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while (mantissa < smallest_nineteen_digit_number && reparse_ptr != fractional_end) {
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mantissa = 10 * mantissa + (*reparse_ptr - '0');
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++reparse_ptr;
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}
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// Again we might be truncating fractional number so scale the exponent with that
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// However here need to subtract 1 from the exponent for every fractional digit
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exponent = explicit_exponent - (reparse_ptr - start_of_fractional_part);
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}
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}
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}
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result.mantissa = mantissa;
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result.exponent = exponent;
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return result;
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}
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constexpr static u128 compute_power_of_five(i64 exponent)
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{
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constexpr u4096 bit128 = u4096 { 1u } << 127u;
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constexpr u4096 bit129 = u4096 { 1u } << 128u;
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VERIFY(exponent <= 308);
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VERIFY(exponent >= -342);
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if (exponent >= 0) {
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u4096 base { 1u };
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for (auto i = 0u; i < exponent; ++i) {
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base *= 5u;
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}
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while (base < bit128)
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base <<= 1u;
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while (base >= bit129)
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base >>= 1u;
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return u128 { base };
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}
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exponent *= -1;
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if (exponent <= 27) {
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u4096 base { 1u };
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for (auto i = 0u; i < exponent; ++i) {
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base *= 5u;
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}
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auto z = u4096::my_size() * 8
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- base.clz();
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auto b = z + 127;
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u4096 base2 { 1u };
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for (auto i = 0u; i < b; ++i) {
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base2 *= 2u;
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}
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base2 /= base;
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base2 += 1u;
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return u128 { base2 };
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}
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VERIFY(exponent <= 342);
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VERIFY(exponent >= 28);
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u4096 base { 1u };
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for (auto i = 0u; i < exponent; ++i) {
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base *= 5u;
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}
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auto z = u4096::my_size() * 8
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- base.clz();
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auto b = 2 * z + 128;
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u4096 base2 { 1u };
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for (auto i = 0u; i < b; ++i) {
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base2 *= 2u;
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}
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base2 /= base;
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base2 += 1u;
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while (base2 >= bit129)
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base2 >>= 1u;
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return u128 { base2 };
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}
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|
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static constexpr i64 lowest_exponent = -342;
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static constexpr i64 highest_exponent = 308;
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|
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constexpr auto pre_compute_table()
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{
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// Computing this entire table at compile time is slow and hits constexpr
|
||
// limits, so we just compute a (the simplest) value to make sure the
|
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// function is used. This table can thus be generated with the function
|
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// `u128 compute_power_of_five(i64 exponent)` above.
|
||
AK::Array<u128, highest_exponent - lowest_exponent + 1> values = {
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u128 { 0x113faa2906a13b3fULL, 0xeef453d6923bd65aULL },
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u128 { 0x4ac7ca59a424c507ULL, 0x9558b4661b6565f8ULL },
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u128 { 0x5d79bcf00d2df649ULL, 0xbaaee17fa23ebf76ULL },
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u128 { 0xf4d82c2c107973dcULL, 0xe95a99df8ace6f53ULL },
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u128 { 0x79071b9b8a4be869ULL, 0x91d8a02bb6c10594ULL },
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u128 { 0x9748e2826cdee284ULL, 0xb64ec836a47146f9ULL },
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u128 { 0xfd1b1b2308169b25ULL, 0xe3e27a444d8d98b7ULL },
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u128 { 0xfe30f0f5e50e20f7ULL, 0x8e6d8c6ab0787f72ULL },
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u128 { 0xbdbd2d335e51a935ULL, 0xb208ef855c969f4fULL },
|
||
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u128 { 0xfdf17746497f7052ULL, 0xffbbcfe994e5c61fULL },
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u128 { 0xace1474dc1d122eULL, 0x915e2486ef32cd60ULL },
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u128 { 0xd819992132456baULL, 0xb5b5ada8aaff80b8ULL },
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u128 { 0x6bcdf07a423aa96bULL, 0x8aa22c0dbef60ee4ULL },
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u128 { 0x86c16c98d2c953c6ULL, 0xad4ab7112eb3929dULL },
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u128 { 0xe871c7bf077ba8b7ULL, 0xd89d64d57a607744ULL },
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u128 { 0x11471cd764ad4972ULL, 0x87625f056c7c4a8bULL },
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u128 { 0xd598e40d3dd89bcfULL, 0xa93af6c6c79b5d2dULL },
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u128 { 0x4aff1d108d4ec2c3ULL, 0xd389b47879823479ULL },
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u128 { 0xcedf722a585139baULL, 0x843610cb4bf160cbULL },
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u128 { 0xc2974eb4ee658828ULL, 0xa54394fe1eedb8feULL },
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u128 { 0x733d226229feea32ULL, 0xce947a3da6a9273eULL },
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u128 { 0x806357d5a3f525fULL, 0x811ccc668829b887ULL },
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u128 { 0xca07c2dcb0cf26f7ULL, 0xa163ff802a3426a8ULL },
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u128 { 0xfc89b393dd02f0b5ULL, 0xc9bcff6034c13052ULL },
|
||
u128 { 0xbbac2078d443ace2ULL, 0xfc2c3f3841f17c67ULL },
|
||
u128 { 0xd54b944b84aa4c0dULL, 0x9d9ba7832936edc0ULL },
|
||
u128 { 0xa9e795e65d4df11ULL, 0xc5029163f384a931ULL },
|
||
u128 { 0x4d4617b5ff4a16d5ULL, 0xf64335bcf065d37dULL },
|
||
u128 { 0x504bced1bf8e4e45ULL, 0x99ea0196163fa42eULL },
|
||
u128 { 0xe45ec2862f71e1d6ULL, 0xc06481fb9bcf8d39ULL },
|
||
u128 { 0x5d767327bb4e5a4cULL, 0xf07da27a82c37088ULL },
|
||
u128 { 0x3a6a07f8d510f86fULL, 0x964e858c91ba2655ULL },
|
||
u128 { 0x890489f70a55368bULL, 0xbbe226efb628afeaULL },
|
||
u128 { 0x2b45ac74ccea842eULL, 0xeadab0aba3b2dbe5ULL },
|
||
u128 { 0x3b0b8bc90012929dULL, 0x92c8ae6b464fc96fULL },
|
||
u128 { 0x9ce6ebb40173744ULL, 0xb77ada0617e3bbcbULL },
|
||
u128 { 0xcc420a6a101d0515ULL, 0xe55990879ddcaabdULL },
|
||
u128 { 0x9fa946824a12232dULL, 0x8f57fa54c2a9eab6ULL },
|
||
u128 { 0x47939822dc96abf9ULL, 0xb32df8e9f3546564ULL },
|
||
u128 { 0x59787e2b93bc56f7ULL, 0xdff9772470297ebdULL },
|
||
u128 { 0x57eb4edb3c55b65aULL, 0x8bfbea76c619ef36ULL },
|
||
u128 { 0xede622920b6b23f1ULL, 0xaefae51477a06b03ULL },
|
||
u128 { 0xe95fab368e45ecedULL, 0xdab99e59958885c4ULL },
|
||
u128 { 0x11dbcb0218ebb414ULL, 0x88b402f7fd75539bULL },
|
||
u128 { 0xd652bdc29f26a119ULL, 0xaae103b5fcd2a881ULL },
|
||
u128 { 0x4be76d3346f0495fULL, 0xd59944a37c0752a2ULL },
|
||
u128 { 0x6f70a4400c562ddbULL, 0x857fcae62d8493a5ULL },
|
||
u128 { 0xcb4ccd500f6bb952ULL, 0xa6dfbd9fb8e5b88eULL },
|
||
u128 { 0x7e2000a41346a7a7ULL, 0xd097ad07a71f26b2ULL },
|
||
u128 { 0x8ed400668c0c28c8ULL, 0x825ecc24c873782fULL },
|
||
u128 { 0x728900802f0f32faULL, 0xa2f67f2dfa90563bULL },
|
||
u128 { 0x4f2b40a03ad2ffb9ULL, 0xcbb41ef979346bcaULL },
|
||
u128 { 0xe2f610c84987bfa8ULL, 0xfea126b7d78186bcULL },
|
||
u128 { 0xdd9ca7d2df4d7c9ULL, 0x9f24b832e6b0f436ULL },
|
||
u128 { 0x91503d1c79720dbbULL, 0xc6ede63fa05d3143ULL },
|
||
u128 { 0x75a44c6397ce912aULL, 0xf8a95fcf88747d94ULL },
|
||
u128 { 0xc986afbe3ee11abaULL, 0x9b69dbe1b548ce7cULL },
|
||
u128 { 0xfbe85badce996168ULL, 0xc24452da229b021bULL },
|
||
u128 { 0xfae27299423fb9c3ULL, 0xf2d56790ab41c2a2ULL },
|
||
u128 { 0xdccd879fc967d41aULL, 0x97c560ba6b0919a5ULL },
|
||
u128 { 0x5400e987bbc1c920ULL, 0xbdb6b8e905cb600fULL },
|
||
u128 { 0x290123e9aab23b68ULL, 0xed246723473e3813ULL },
|
||
u128 { 0xf9a0b6720aaf6521ULL, 0x9436c0760c86e30bULL },
|
||
u128 { 0xf808e40e8d5b3e69ULL, 0xb94470938fa89bceULL },
|
||
u128 { 0xb60b1d1230b20e04ULL, 0xe7958cb87392c2c2ULL },
|
||
u128 { 0xb1c6f22b5e6f48c2ULL, 0x90bd77f3483bb9b9ULL },
|
||
u128 { 0x1e38aeb6360b1af3ULL, 0xb4ecd5f01a4aa828ULL },
|
||
u128 { 0x25c6da63c38de1b0ULL, 0xe2280b6c20dd5232ULL },
|
||
u128 { 0x579c487e5a38ad0eULL, 0x8d590723948a535fULL },
|
||
u128 { 0x2d835a9df0c6d851ULL, 0xb0af48ec79ace837ULL },
|
||
u128 { 0xf8e431456cf88e65ULL, 0xdcdb1b2798182244ULL },
|
||
u128 { 0x1b8e9ecb641b58ffULL, 0x8a08f0f8bf0f156bULL },
|
||
u128 { 0xe272467e3d222f3fULL, 0xac8b2d36eed2dac5ULL },
|
||
u128 { 0x5b0ed81dcc6abb0fULL, 0xd7adf884aa879177ULL },
|
||
u128 { 0x98e947129fc2b4e9ULL, 0x86ccbb52ea94baeaULL },
|
||
u128 { 0x3f2398d747b36224ULL, 0xa87fea27a539e9a5ULL },
|
||
u128 { 0x8eec7f0d19a03aadULL, 0xd29fe4b18e88640eULL },
|
||
u128 { 0x1953cf68300424acULL, 0x83a3eeeef9153e89ULL },
|
||
u128 { 0x5fa8c3423c052dd7ULL, 0xa48ceaaab75a8e2bULL },
|
||
u128 { 0x3792f412cb06794dULL, 0xcdb02555653131b6ULL },
|
||
u128 { 0xe2bbd88bbee40bd0ULL, 0x808e17555f3ebf11ULL },
|
||
u128 { 0x5b6aceaeae9d0ec4ULL, 0xa0b19d2ab70e6ed6ULL },
|
||
u128 { 0xf245825a5a445275ULL, 0xc8de047564d20a8bULL },
|
||
u128 { 0xeed6e2f0f0d56712ULL, 0xfb158592be068d2eULL },
|
||
u128 { 0x55464dd69685606bULL, 0x9ced737bb6c4183dULL },
|
||
u128 { 0xaa97e14c3c26b886ULL, 0xc428d05aa4751e4cULL },
|
||
u128 { 0xd53dd99f4b3066a8ULL, 0xf53304714d9265dfULL },
|
||
u128 { 0xe546a8038efe4029ULL, 0x993fe2c6d07b7fabULL },
|
||
u128 { 0xde98520472bdd033ULL, 0xbf8fdb78849a5f96ULL },
|
||
u128 { 0x963e66858f6d4440ULL, 0xef73d256a5c0f77cULL },
|
||
u128 { 0xdde7001379a44aa8ULL, 0x95a8637627989aadULL },
|
||
u128 { 0x5560c018580d5d52ULL, 0xbb127c53b17ec159ULL },
|
||
u128 { 0xaab8f01e6e10b4a6ULL, 0xe9d71b689dde71afULL },
|
||
u128 { 0xcab3961304ca70e8ULL, 0x9226712162ab070dULL },
|
||
u128 { 0x3d607b97c5fd0d22ULL, 0xb6b00d69bb55c8d1ULL },
|
||
u128 { 0x8cb89a7db77c506aULL, 0xe45c10c42a2b3b05ULL },
|
||
u128 { 0x77f3608e92adb242ULL, 0x8eb98a7a9a5b04e3ULL },
|
||
u128 { 0x55f038b237591ed3ULL, 0xb267ed1940f1c61cULL },
|
||
u128 { 0x6b6c46dec52f6688ULL, 0xdf01e85f912e37a3ULL },
|
||
u128 { 0x2323ac4b3b3da015ULL, 0x8b61313bbabce2c6ULL },
|
||
u128 { 0xabec975e0a0d081aULL, 0xae397d8aa96c1b77ULL },
|
||
u128 { 0x96e7bd358c904a21ULL, 0xd9c7dced53c72255ULL },
|
||
u128 { 0x7e50d64177da2e54ULL, 0x881cea14545c7575ULL },
|
||
u128 { 0xdde50bd1d5d0b9e9ULL, 0xaa242499697392d2ULL },
|
||
u128 { 0x955e4ec64b44e864ULL, 0xd4ad2dbfc3d07787ULL },
|
||
u128 { 0xbd5af13bef0b113eULL, 0x84ec3c97da624ab4ULL },
|
||
u128 { 0xecb1ad8aeacdd58eULL, 0xa6274bbdd0fadd61ULL },
|
||
u128 { 0x67de18eda5814af2ULL, 0xcfb11ead453994baULL },
|
||
u128 { 0x80eacf948770ced7ULL, 0x81ceb32c4b43fcf4ULL },
|
||
u128 { 0xa1258379a94d028dULL, 0xa2425ff75e14fc31ULL },
|
||
u128 { 0x96ee45813a04330ULL, 0xcad2f7f5359a3b3eULL },
|
||
u128 { 0x8bca9d6e188853fcULL, 0xfd87b5f28300ca0dULL },
|
||
u128 { 0x775ea264cf55347eULL, 0x9e74d1b791e07e48ULL },
|
||
u128 { 0x95364afe032a819eULL, 0xc612062576589ddaULL },
|
||
u128 { 0x3a83ddbd83f52205ULL, 0xf79687aed3eec551ULL },
|
||
u128 { 0xc4926a9672793543ULL, 0x9abe14cd44753b52ULL },
|
||
u128 { 0x75b7053c0f178294ULL, 0xc16d9a0095928a27ULL },
|
||
u128 { 0x5324c68b12dd6339ULL, 0xf1c90080baf72cb1ULL },
|
||
u128 { 0xd3f6fc16ebca5e04ULL, 0x971da05074da7beeULL },
|
||
u128 { 0x88f4bb1ca6bcf585ULL, 0xbce5086492111aeaULL },
|
||
u128 { 0x2b31e9e3d06c32e6ULL, 0xec1e4a7db69561a5ULL },
|
||
u128 { 0x3aff322e62439fd0ULL, 0x9392ee8e921d5d07ULL },
|
||
u128 { 0x9befeb9fad487c3ULL, 0xb877aa3236a4b449ULL },
|
||
u128 { 0x4c2ebe687989a9b4ULL, 0xe69594bec44de15bULL },
|
||
u128 { 0xf9d37014bf60a11ULL, 0x901d7cf73ab0acd9ULL },
|
||
u128 { 0x538484c19ef38c95ULL, 0xb424dc35095cd80fULL },
|
||
u128 { 0x2865a5f206b06fbaULL, 0xe12e13424bb40e13ULL },
|
||
u128 { 0xf93f87b7442e45d4ULL, 0x8cbccc096f5088cbULL },
|
||
u128 { 0xf78f69a51539d749ULL, 0xafebff0bcb24aafeULL },
|
||
u128 { 0xb573440e5a884d1cULL, 0xdbe6fecebdedd5beULL },
|
||
u128 { 0x31680a88f8953031ULL, 0x89705f4136b4a597ULL },
|
||
u128 { 0xfdc20d2b36ba7c3eULL, 0xabcc77118461cefcULL },
|
||
u128 { 0x3d32907604691b4dULL, 0xd6bf94d5e57a42bcULL },
|
||
u128 { 0xa63f9a49c2c1b110ULL, 0x8637bd05af6c69b5ULL },
|
||
u128 { 0xfcf80dc33721d54ULL, 0xa7c5ac471b478423ULL },
|
||
u128 { 0xd3c36113404ea4a9ULL, 0xd1b71758e219652bULL },
|
||
u128 { 0x645a1cac083126eaULL, 0x83126e978d4fdf3bULL },
|
||
u128 { 0x3d70a3d70a3d70a4ULL, 0xa3d70a3d70a3d70aULL },
|
||
u128 { 0xcccccccccccccccdULL, 0xccccccccccccccccULL },
|
||
compute_power_of_five(0),
|
||
u128 { 0x0ULL, 0xa000000000000000ULL },
|
||
u128 { 0x0ULL, 0xc800000000000000ULL },
|
||
u128 { 0x0ULL, 0xfa00000000000000ULL },
|
||
u128 { 0x0ULL, 0x9c40000000000000ULL },
|
||
u128 { 0x0ULL, 0xc350000000000000ULL },
|
||
u128 { 0x0ULL, 0xf424000000000000ULL },
|
||
u128 { 0x0ULL, 0x9896800000000000ULL },
|
||
u128 { 0x0ULL, 0xbebc200000000000ULL },
|
||
u128 { 0x0ULL, 0xee6b280000000000ULL },
|
||
u128 { 0x0ULL, 0x9502f90000000000ULL },
|
||
u128 { 0x0ULL, 0xba43b74000000000ULL },
|
||
u128 { 0x0ULL, 0xe8d4a51000000000ULL },
|
||
u128 { 0x0ULL, 0x9184e72a00000000ULL },
|
||
u128 { 0x0ULL, 0xb5e620f480000000ULL },
|
||
u128 { 0x0ULL, 0xe35fa931a0000000ULL },
|
||
u128 { 0x0ULL, 0x8e1bc9bf04000000ULL },
|
||
u128 { 0x0ULL, 0xb1a2bc2ec5000000ULL },
|
||
u128 { 0x0ULL, 0xde0b6b3a76400000ULL },
|
||
u128 { 0x0ULL, 0x8ac7230489e80000ULL },
|
||
u128 { 0x0ULL, 0xad78ebc5ac620000ULL },
|
||
u128 { 0x0ULL, 0xd8d726b7177a8000ULL },
|
||
u128 { 0x0ULL, 0x878678326eac9000ULL },
|
||
u128 { 0x0ULL, 0xa968163f0a57b400ULL },
|
||
u128 { 0x0ULL, 0xd3c21bcecceda100ULL },
|
||
u128 { 0x0ULL, 0x84595161401484a0ULL },
|
||
u128 { 0x0ULL, 0xa56fa5b99019a5c8ULL },
|
||
u128 { 0x0ULL, 0xcecb8f27f4200f3aULL },
|
||
u128 { 0x4000000000000000ULL, 0x813f3978f8940984ULL },
|
||
u128 { 0x5000000000000000ULL, 0xa18f07d736b90be5ULL },
|
||
u128 { 0xa400000000000000ULL, 0xc9f2c9cd04674edeULL },
|
||
u128 { 0x4d00000000000000ULL, 0xfc6f7c4045812296ULL },
|
||
u128 { 0xf020000000000000ULL, 0x9dc5ada82b70b59dULL },
|
||
u128 { 0x6c28000000000000ULL, 0xc5371912364ce305ULL },
|
||
u128 { 0xc732000000000000ULL, 0xf684df56c3e01bc6ULL },
|
||
u128 { 0x3c7f400000000000ULL, 0x9a130b963a6c115cULL },
|
||
u128 { 0x4b9f100000000000ULL, 0xc097ce7bc90715b3ULL },
|
||
u128 { 0x1e86d40000000000ULL, 0xf0bdc21abb48db20ULL },
|
||
u128 { 0x1314448000000000ULL, 0x96769950b50d88f4ULL },
|
||
u128 { 0x17d955a000000000ULL, 0xbc143fa4e250eb31ULL },
|
||
u128 { 0x5dcfab0800000000ULL, 0xeb194f8e1ae525fdULL },
|
||
u128 { 0x5aa1cae500000000ULL, 0x92efd1b8d0cf37beULL },
|
||
u128 { 0xf14a3d9e40000000ULL, 0xb7abc627050305adULL },
|
||
u128 { 0x6d9ccd05d0000000ULL, 0xe596b7b0c643c719ULL },
|
||
u128 { 0xe4820023a2000000ULL, 0x8f7e32ce7bea5c6fULL },
|
||
u128 { 0xdda2802c8a800000ULL, 0xb35dbf821ae4f38bULL },
|
||
u128 { 0xd50b2037ad200000ULL, 0xe0352f62a19e306eULL },
|
||
u128 { 0x4526f422cc340000ULL, 0x8c213d9da502de45ULL },
|
||
u128 { 0x9670b12b7f410000ULL, 0xaf298d050e4395d6ULL },
|
||
u128 { 0x3c0cdd765f114000ULL, 0xdaf3f04651d47b4cULL },
|
||
u128 { 0xa5880a69fb6ac800ULL, 0x88d8762bf324cd0fULL },
|
||
u128 { 0x8eea0d047a457a00ULL, 0xab0e93b6efee0053ULL },
|
||
u128 { 0x72a4904598d6d880ULL, 0xd5d238a4abe98068ULL },
|
||
u128 { 0x47a6da2b7f864750ULL, 0x85a36366eb71f041ULL },
|
||
u128 { 0x999090b65f67d924ULL, 0xa70c3c40a64e6c51ULL },
|
||
u128 { 0xfff4b4e3f741cf6dULL, 0xd0cf4b50cfe20765ULL },
|
||
u128 { 0xbff8f10e7a8921a4ULL, 0x82818f1281ed449fULL },
|
||
u128 { 0xaff72d52192b6a0dULL, 0xa321f2d7226895c7ULL },
|
||
u128 { 0x9bf4f8a69f764490ULL, 0xcbea6f8ceb02bb39ULL },
|
||
u128 { 0x2f236d04753d5b4ULL, 0xfee50b7025c36a08ULL },
|
||
u128 { 0x1d762422c946590ULL, 0x9f4f2726179a2245ULL },
|
||
u128 { 0x424d3ad2b7b97ef5ULL, 0xc722f0ef9d80aad6ULL },
|
||
u128 { 0xd2e0898765a7deb2ULL, 0xf8ebad2b84e0d58bULL },
|
||
u128 { 0x63cc55f49f88eb2fULL, 0x9b934c3b330c8577ULL },
|
||
u128 { 0x3cbf6b71c76b25fbULL, 0xc2781f49ffcfa6d5ULL },
|
||
u128 { 0x8bef464e3945ef7aULL, 0xf316271c7fc3908aULL },
|
||
u128 { 0x97758bf0e3cbb5acULL, 0x97edd871cfda3a56ULL },
|
||
u128 { 0x3d52eeed1cbea317ULL, 0xbde94e8e43d0c8ecULL },
|
||
u128 { 0x4ca7aaa863ee4bddULL, 0xed63a231d4c4fb27ULL },
|
||
u128 { 0x8fe8caa93e74ef6aULL, 0x945e455f24fb1cf8ULL },
|
||
u128 { 0xb3e2fd538e122b44ULL, 0xb975d6b6ee39e436ULL },
|
||
u128 { 0x60dbbca87196b616ULL, 0xe7d34c64a9c85d44ULL },
|
||
u128 { 0xbc8955e946fe31cdULL, 0x90e40fbeea1d3a4aULL },
|
||
u128 { 0x6babab6398bdbe41ULL, 0xb51d13aea4a488ddULL },
|
||
u128 { 0xc696963c7eed2dd1ULL, 0xe264589a4dcdab14ULL },
|
||
u128 { 0xfc1e1de5cf543ca2ULL, 0x8d7eb76070a08aecULL },
|
||
u128 { 0x3b25a55f43294bcbULL, 0xb0de65388cc8ada8ULL },
|
||
u128 { 0x49ef0eb713f39ebeULL, 0xdd15fe86affad912ULL },
|
||
u128 { 0x6e3569326c784337ULL, 0x8a2dbf142dfcc7abULL },
|
||
u128 { 0x49c2c37f07965404ULL, 0xacb92ed9397bf996ULL },
|
||
u128 { 0xdc33745ec97be906ULL, 0xd7e77a8f87daf7fbULL },
|
||
u128 { 0x69a028bb3ded71a3ULL, 0x86f0ac99b4e8dafdULL },
|
||
u128 { 0xc40832ea0d68ce0cULL, 0xa8acd7c0222311bcULL },
|
||
u128 { 0xf50a3fa490c30190ULL, 0xd2d80db02aabd62bULL },
|
||
u128 { 0x792667c6da79e0faULL, 0x83c7088e1aab65dbULL },
|
||
u128 { 0x577001b891185938ULL, 0xa4b8cab1a1563f52ULL },
|
||
u128 { 0xed4c0226b55e6f86ULL, 0xcde6fd5e09abcf26ULL },
|
||
u128 { 0x544f8158315b05b4ULL, 0x80b05e5ac60b6178ULL },
|
||
u128 { 0x696361ae3db1c721ULL, 0xa0dc75f1778e39d6ULL },
|
||
u128 { 0x3bc3a19cd1e38e9ULL, 0xc913936dd571c84cULL },
|
||
u128 { 0x4ab48a04065c723ULL, 0xfb5878494ace3a5fULL },
|
||
u128 { 0x62eb0d64283f9c76ULL, 0x9d174b2dcec0e47bULL },
|
||
u128 { 0x3ba5d0bd324f8394ULL, 0xc45d1df942711d9aULL },
|
||
u128 { 0xca8f44ec7ee36479ULL, 0xf5746577930d6500ULL },
|
||
u128 { 0x7e998b13cf4e1ecbULL, 0x9968bf6abbe85f20ULL },
|
||
u128 { 0x9e3fedd8c321a67eULL, 0xbfc2ef456ae276e8ULL },
|
||
u128 { 0xc5cfe94ef3ea101eULL, 0xefb3ab16c59b14a2ULL },
|
||
u128 { 0xbba1f1d158724a12ULL, 0x95d04aee3b80ece5ULL },
|
||
u128 { 0x2a8a6e45ae8edc97ULL, 0xbb445da9ca61281fULL },
|
||
u128 { 0xf52d09d71a3293bdULL, 0xea1575143cf97226ULL },
|
||
u128 { 0x593c2626705f9c56ULL, 0x924d692ca61be758ULL },
|
||
u128 { 0x6f8b2fb00c77836cULL, 0xb6e0c377cfa2e12eULL },
|
||
u128 { 0xb6dfb9c0f956447ULL, 0xe498f455c38b997aULL },
|
||
u128 { 0x4724bd4189bd5eacULL, 0x8edf98b59a373fecULL },
|
||
u128 { 0x58edec91ec2cb657ULL, 0xb2977ee300c50fe7ULL },
|
||
u128 { 0x2f2967b66737e3edULL, 0xdf3d5e9bc0f653e1ULL },
|
||
u128 { 0xbd79e0d20082ee74ULL, 0x8b865b215899f46cULL },
|
||
u128 { 0xecd8590680a3aa11ULL, 0xae67f1e9aec07187ULL },
|
||
u128 { 0xe80e6f4820cc9495ULL, 0xda01ee641a708de9ULL },
|
||
u128 { 0x3109058d147fdcddULL, 0x884134fe908658b2ULL },
|
||
u128 { 0xbd4b46f0599fd415ULL, 0xaa51823e34a7eedeULL },
|
||
u128 { 0x6c9e18ac7007c91aULL, 0xd4e5e2cdc1d1ea96ULL },
|
||
u128 { 0x3e2cf6bc604ddb0ULL, 0x850fadc09923329eULL },
|
||
u128 { 0x84db8346b786151cULL, 0xa6539930bf6bff45ULL },
|
||
u128 { 0xe612641865679a63ULL, 0xcfe87f7cef46ff16ULL },
|
||
u128 { 0x4fcb7e8f3f60c07eULL, 0x81f14fae158c5f6eULL },
|
||
u128 { 0xe3be5e330f38f09dULL, 0xa26da3999aef7749ULL },
|
||
u128 { 0x5cadf5bfd3072cc5ULL, 0xcb090c8001ab551cULL },
|
||
u128 { 0x73d9732fc7c8f7f6ULL, 0xfdcb4fa002162a63ULL },
|
||
u128 { 0x2867e7fddcdd9afaULL, 0x9e9f11c4014dda7eULL },
|
||
u128 { 0xb281e1fd541501b8ULL, 0xc646d63501a1511dULL },
|
||
u128 { 0x1f225a7ca91a4226ULL, 0xf7d88bc24209a565ULL },
|
||
u128 { 0x3375788de9b06958ULL, 0x9ae757596946075fULL },
|
||
u128 { 0x52d6b1641c83aeULL, 0xc1a12d2fc3978937ULL },
|
||
u128 { 0xc0678c5dbd23a49aULL, 0xf209787bb47d6b84ULL },
|
||
u128 { 0xf840b7ba963646e0ULL, 0x9745eb4d50ce6332ULL },
|
||
u128 { 0xb650e5a93bc3d898ULL, 0xbd176620a501fbffULL },
|
||
u128 { 0xa3e51f138ab4cebeULL, 0xec5d3fa8ce427affULL },
|
||
u128 { 0xc66f336c36b10137ULL, 0x93ba47c980e98cdfULL },
|
||
u128 { 0xb80b0047445d4184ULL, 0xb8a8d9bbe123f017ULL },
|
||
u128 { 0xa60dc059157491e5ULL, 0xe6d3102ad96cec1dULL },
|
||
u128 { 0x87c89837ad68db2fULL, 0x9043ea1ac7e41392ULL },
|
||
u128 { 0x29babe4598c311fbULL, 0xb454e4a179dd1877ULL },
|
||
u128 { 0xf4296dd6fef3d67aULL, 0xe16a1dc9d8545e94ULL },
|
||
u128 { 0x1899e4a65f58660cULL, 0x8ce2529e2734bb1dULL },
|
||
u128 { 0x5ec05dcff72e7f8fULL, 0xb01ae745b101e9e4ULL },
|
||
u128 { 0x76707543f4fa1f73ULL, 0xdc21a1171d42645dULL },
|
||
u128 { 0x6a06494a791c53a8ULL, 0x899504ae72497ebaULL },
|
||
u128 { 0x487db9d17636892ULL, 0xabfa45da0edbde69ULL },
|
||
u128 { 0x45a9d2845d3c42b6ULL, 0xd6f8d7509292d603ULL },
|
||
u128 { 0xb8a2392ba45a9b2ULL, 0x865b86925b9bc5c2ULL },
|
||
u128 { 0x8e6cac7768d7141eULL, 0xa7f26836f282b732ULL },
|
||
u128 { 0x3207d795430cd926ULL, 0xd1ef0244af2364ffULL },
|
||
u128 { 0x7f44e6bd49e807b8ULL, 0x8335616aed761f1fULL },
|
||
u128 { 0x5f16206c9c6209a6ULL, 0xa402b9c5a8d3a6e7ULL },
|
||
u128 { 0x36dba887c37a8c0fULL, 0xcd036837130890a1ULL },
|
||
u128 { 0xc2494954da2c9789ULL, 0x802221226be55a64ULL },
|
||
u128 { 0xf2db9baa10b7bd6cULL, 0xa02aa96b06deb0fdULL },
|
||
u128 { 0x6f92829494e5acc7ULL, 0xc83553c5c8965d3dULL },
|
||
u128 { 0xcb772339ba1f17f9ULL, 0xfa42a8b73abbf48cULL },
|
||
u128 { 0xff2a760414536efbULL, 0x9c69a97284b578d7ULL },
|
||
u128 { 0xfef5138519684abaULL, 0xc38413cf25e2d70dULL },
|
||
u128 { 0x7eb258665fc25d69ULL, 0xf46518c2ef5b8cd1ULL },
|
||
u128 { 0xef2f773ffbd97a61ULL, 0x98bf2f79d5993802ULL },
|
||
u128 { 0xaafb550ffacfd8faULL, 0xbeeefb584aff8603ULL },
|
||
u128 { 0x95ba2a53f983cf38ULL, 0xeeaaba2e5dbf6784ULL },
|
||
u128 { 0xdd945a747bf26183ULL, 0x952ab45cfa97a0b2ULL },
|
||
u128 { 0x94f971119aeef9e4ULL, 0xba756174393d88dfULL },
|
||
u128 { 0x7a37cd5601aab85dULL, 0xe912b9d1478ceb17ULL },
|
||
u128 { 0xac62e055c10ab33aULL, 0x91abb422ccb812eeULL },
|
||
u128 { 0x577b986b314d6009ULL, 0xb616a12b7fe617aaULL },
|
||
u128 { 0xed5a7e85fda0b80bULL, 0xe39c49765fdf9d94ULL },
|
||
u128 { 0x14588f13be847307ULL, 0x8e41ade9fbebc27dULL },
|
||
u128 { 0x596eb2d8ae258fc8ULL, 0xb1d219647ae6b31cULL },
|
||
u128 { 0x6fca5f8ed9aef3bbULL, 0xde469fbd99a05fe3ULL },
|
||
u128 { 0x25de7bb9480d5854ULL, 0x8aec23d680043beeULL },
|
||
u128 { 0xaf561aa79a10ae6aULL, 0xada72ccc20054ae9ULL },
|
||
u128 { 0x1b2ba1518094da04ULL, 0xd910f7ff28069da4ULL },
|
||
u128 { 0x90fb44d2f05d0842ULL, 0x87aa9aff79042286ULL },
|
||
u128 { 0x353a1607ac744a53ULL, 0xa99541bf57452b28ULL },
|
||
u128 { 0x42889b8997915ce8ULL, 0xd3fa922f2d1675f2ULL },
|
||
u128 { 0x69956135febada11ULL, 0x847c9b5d7c2e09b7ULL },
|
||
u128 { 0x43fab9837e699095ULL, 0xa59bc234db398c25ULL },
|
||
u128 { 0x94f967e45e03f4bbULL, 0xcf02b2c21207ef2eULL },
|
||
u128 { 0x1d1be0eebac278f5ULL, 0x8161afb94b44f57dULL },
|
||
u128 { 0x6462d92a69731732ULL, 0xa1ba1ba79e1632dcULL },
|
||
u128 { 0x7d7b8f7503cfdcfeULL, 0xca28a291859bbf93ULL },
|
||
u128 { 0x5cda735244c3d43eULL, 0xfcb2cb35e702af78ULL },
|
||
u128 { 0x3a0888136afa64a7ULL, 0x9defbf01b061adabULL },
|
||
u128 { 0x88aaa1845b8fdd0ULL, 0xc56baec21c7a1916ULL },
|
||
u128 { 0x8aad549e57273d45ULL, 0xf6c69a72a3989f5bULL },
|
||
u128 { 0x36ac54e2f678864bULL, 0x9a3c2087a63f6399ULL },
|
||
u128 { 0x84576a1bb416a7ddULL, 0xc0cb28a98fcf3c7fULL },
|
||
u128 { 0x656d44a2a11c51d5ULL, 0xf0fdf2d3f3c30b9fULL },
|
||
u128 { 0x9f644ae5a4b1b325ULL, 0x969eb7c47859e743ULL },
|
||
u128 { 0x873d5d9f0dde1feeULL, 0xbc4665b596706114ULL },
|
||
u128 { 0xa90cb506d155a7eaULL, 0xeb57ff22fc0c7959ULL },
|
||
u128 { 0x9a7f12442d588f2ULL, 0x9316ff75dd87cbd8ULL },
|
||
u128 { 0xc11ed6d538aeb2fULL, 0xb7dcbf5354e9beceULL },
|
||
u128 { 0x8f1668c8a86da5faULL, 0xe5d3ef282a242e81ULL },
|
||
u128 { 0xf96e017d694487bcULL, 0x8fa475791a569d10ULL },
|
||
u128 { 0x37c981dcc395a9acULL, 0xb38d92d760ec4455ULL },
|
||
u128 { 0x85bbe253f47b1417ULL, 0xe070f78d3927556aULL },
|
||
u128 { 0x93956d7478ccec8eULL, 0x8c469ab843b89562ULL },
|
||
u128 { 0x387ac8d1970027b2ULL, 0xaf58416654a6babbULL },
|
||
u128 { 0x6997b05fcc0319eULL, 0xdb2e51bfe9d0696aULL },
|
||
u128 { 0x441fece3bdf81f03ULL, 0x88fcf317f22241e2ULL },
|
||
u128 { 0xd527e81cad7626c3ULL, 0xab3c2fddeeaad25aULL },
|
||
u128 { 0x8a71e223d8d3b074ULL, 0xd60b3bd56a5586f1ULL },
|
||
u128 { 0xf6872d5667844e49ULL, 0x85c7056562757456ULL },
|
||
u128 { 0xb428f8ac016561dbULL, 0xa738c6bebb12d16cULL },
|
||
u128 { 0xe13336d701beba52ULL, 0xd106f86e69d785c7ULL },
|
||
u128 { 0xecc0024661173473ULL, 0x82a45b450226b39cULL },
|
||
u128 { 0x27f002d7f95d0190ULL, 0xa34d721642b06084ULL },
|
||
u128 { 0x31ec038df7b441f4ULL, 0xcc20ce9bd35c78a5ULL },
|
||
u128 { 0x7e67047175a15271ULL, 0xff290242c83396ceULL },
|
||
u128 { 0xf0062c6e984d386ULL, 0x9f79a169bd203e41ULL },
|
||
u128 { 0x52c07b78a3e60868ULL, 0xc75809c42c684dd1ULL },
|
||
u128 { 0xa7709a56ccdf8a82ULL, 0xf92e0c3537826145ULL },
|
||
u128 { 0x88a66076400bb691ULL, 0x9bbcc7a142b17ccbULL },
|
||
u128 { 0x6acff893d00ea435ULL, 0xc2abf989935ddbfeULL },
|
||
u128 { 0x583f6b8c4124d43ULL, 0xf356f7ebf83552feULL },
|
||
u128 { 0xc3727a337a8b704aULL, 0x98165af37b2153deULL },
|
||
u128 { 0x744f18c0592e4c5cULL, 0xbe1bf1b059e9a8d6ULL },
|
||
u128 { 0x1162def06f79df73ULL, 0xeda2ee1c7064130cULL },
|
||
u128 { 0x8addcb5645ac2ba8ULL, 0x9485d4d1c63e8be7ULL },
|
||
u128 { 0x6d953e2bd7173692ULL, 0xb9a74a0637ce2ee1ULL },
|
||
u128 { 0xc8fa8db6ccdd0437ULL, 0xe8111c87c5c1ba99ULL },
|
||
u128 { 0x1d9c9892400a22a2ULL, 0x910ab1d4db9914a0ULL },
|
||
u128 { 0x2503beb6d00cab4bULL, 0xb54d5e4a127f59c8ULL },
|
||
u128 { 0x2e44ae64840fd61dULL, 0xe2a0b5dc971f303aULL },
|
||
u128 { 0x5ceaecfed289e5d2ULL, 0x8da471a9de737e24ULL },
|
||
u128 { 0x7425a83e872c5f47ULL, 0xb10d8e1456105dadULL },
|
||
u128 { 0xd12f124e28f77719ULL, 0xdd50f1996b947518ULL },
|
||
u128 { 0x82bd6b70d99aaa6fULL, 0x8a5296ffe33cc92fULL },
|
||
u128 { 0x636cc64d1001550bULL, 0xace73cbfdc0bfb7bULL },
|
||
u128 { 0x3c47f7e05401aa4eULL, 0xd8210befd30efa5aULL },
|
||
u128 { 0x65acfaec34810a71ULL, 0x8714a775e3e95c78ULL },
|
||
u128 { 0x7f1839a741a14d0dULL, 0xa8d9d1535ce3b396ULL },
|
||
u128 { 0x1ede48111209a050ULL, 0xd31045a8341ca07cULL },
|
||
u128 { 0x934aed0aab460432ULL, 0x83ea2b892091e44dULL },
|
||
u128 { 0xf81da84d5617853fULL, 0xa4e4b66b68b65d60ULL },
|
||
u128 { 0x36251260ab9d668eULL, 0xce1de40642e3f4b9ULL },
|
||
u128 { 0xc1d72b7c6b426019ULL, 0x80d2ae83e9ce78f3ULL },
|
||
u128 { 0xb24cf65b8612f81fULL, 0xa1075a24e4421730ULL },
|
||
u128 { 0xdee033f26797b627ULL, 0xc94930ae1d529cfcULL },
|
||
u128 { 0x169840ef017da3b1ULL, 0xfb9b7cd9a4a7443cULL },
|
||
u128 { 0x8e1f289560ee864eULL, 0x9d412e0806e88aa5ULL },
|
||
u128 { 0xf1a6f2bab92a27e2ULL, 0xc491798a08a2ad4eULL },
|
||
u128 { 0xae10af696774b1dbULL, 0xf5b5d7ec8acb58a2ULL },
|
||
u128 { 0xacca6da1e0a8ef29ULL, 0x9991a6f3d6bf1765ULL },
|
||
u128 { 0x17fd090a58d32af3ULL, 0xbff610b0cc6edd3fULL },
|
||
u128 { 0xddfc4b4cef07f5b0ULL, 0xeff394dcff8a948eULL },
|
||
u128 { 0x4abdaf101564f98eULL, 0x95f83d0a1fb69cd9ULL },
|
||
u128 { 0x9d6d1ad41abe37f1ULL, 0xbb764c4ca7a4440fULL },
|
||
u128 { 0x84c86189216dc5edULL, 0xea53df5fd18d5513ULL },
|
||
u128 { 0x32fd3cf5b4e49bb4ULL, 0x92746b9be2f8552cULL },
|
||
u128 { 0x3fbc8c33221dc2a1ULL, 0xb7118682dbb66a77ULL },
|
||
u128 { 0xfabaf3feaa5334aULL, 0xe4d5e82392a40515ULL },
|
||
u128 { 0x29cb4d87f2a7400eULL, 0x8f05b1163ba6832dULL },
|
||
u128 { 0x743e20e9ef511012ULL, 0xb2c71d5bca9023f8ULL },
|
||
u128 { 0x914da9246b255416ULL, 0xdf78e4b2bd342cf6ULL },
|
||
u128 { 0x1ad089b6c2f7548eULL, 0x8bab8eefb6409c1aULL },
|
||
u128 { 0xa184ac2473b529b1ULL, 0xae9672aba3d0c320ULL },
|
||
u128 { 0xc9e5d72d90a2741eULL, 0xda3c0f568cc4f3e8ULL },
|
||
u128 { 0x7e2fa67c7a658892ULL, 0x8865899617fb1871ULL },
|
||
u128 { 0xddbb901b98feeab7ULL, 0xaa7eebfb9df9de8dULL },
|
||
u128 { 0x552a74227f3ea565ULL, 0xd51ea6fa85785631ULL },
|
||
u128 { 0xd53a88958f87275fULL, 0x8533285c936b35deULL },
|
||
u128 { 0x8a892abaf368f137ULL, 0xa67ff273b8460356ULL },
|
||
u128 { 0x2d2b7569b0432d85ULL, 0xd01fef10a657842cULL },
|
||
u128 { 0x9c3b29620e29fc73ULL, 0x8213f56a67f6b29bULL },
|
||
u128 { 0x8349f3ba91b47b8fULL, 0xa298f2c501f45f42ULL },
|
||
u128 { 0x241c70a936219a73ULL, 0xcb3f2f7642717713ULL },
|
||
u128 { 0xed238cd383aa0110ULL, 0xfe0efb53d30dd4d7ULL },
|
||
u128 { 0xf4363804324a40aaULL, 0x9ec95d1463e8a506ULL },
|
||
u128 { 0xb143c6053edcd0d5ULL, 0xc67bb4597ce2ce48ULL },
|
||
u128 { 0xdd94b7868e94050aULL, 0xf81aa16fdc1b81daULL },
|
||
u128 { 0xca7cf2b4191c8326ULL, 0x9b10a4e5e9913128ULL },
|
||
u128 { 0xfd1c2f611f63a3f0ULL, 0xc1d4ce1f63f57d72ULL },
|
||
u128 { 0xbc633b39673c8cecULL, 0xf24a01a73cf2dccfULL },
|
||
u128 { 0xd5be0503e085d813ULL, 0x976e41088617ca01ULL },
|
||
u128 { 0x4b2d8644d8a74e18ULL, 0xbd49d14aa79dbc82ULL },
|
||
u128 { 0xddf8e7d60ed1219eULL, 0xec9c459d51852ba2ULL },
|
||
u128 { 0xcabb90e5c942b503ULL, 0x93e1ab8252f33b45ULL },
|
||
u128 { 0x3d6a751f3b936243ULL, 0xb8da1662e7b00a17ULL },
|
||
u128 { 0xcc512670a783ad4ULL, 0xe7109bfba19c0c9dULL },
|
||
u128 { 0x27fb2b80668b24c5ULL, 0x906a617d450187e2ULL },
|
||
u128 { 0xb1f9f660802dedf6ULL, 0xb484f9dc9641e9daULL },
|
||
u128 { 0x5e7873f8a0396973ULL, 0xe1a63853bbd26451ULL },
|
||
u128 { 0xdb0b487b6423e1e8ULL, 0x8d07e33455637eb2ULL },
|
||
u128 { 0x91ce1a9a3d2cda62ULL, 0xb049dc016abc5e5fULL },
|
||
u128 { 0x7641a140cc7810fbULL, 0xdc5c5301c56b75f7ULL },
|
||
u128 { 0xa9e904c87fcb0a9dULL, 0x89b9b3e11b6329baULL },
|
||
u128 { 0x546345fa9fbdcd44ULL, 0xac2820d9623bf429ULL },
|
||
u128 { 0xa97c177947ad4095ULL, 0xd732290fbacaf133ULL },
|
||
u128 { 0x49ed8eabcccc485dULL, 0x867f59a9d4bed6c0ULL },
|
||
u128 { 0x5c68f256bfff5a74ULL, 0xa81f301449ee8c70ULL },
|
||
u128 { 0x73832eec6fff3111ULL, 0xd226fc195c6a2f8cULL },
|
||
u128 { 0xc831fd53c5ff7eabULL, 0x83585d8fd9c25db7ULL },
|
||
u128 { 0xba3e7ca8b77f5e55ULL, 0xa42e74f3d032f525ULL },
|
||
u128 { 0x28ce1bd2e55f35ebULL, 0xcd3a1230c43fb26fULL },
|
||
u128 { 0x7980d163cf5b81b3ULL, 0x80444b5e7aa7cf85ULL },
|
||
u128 { 0xd7e105bcc332621fULL, 0xa0555e361951c366ULL },
|
||
u128 { 0x8dd9472bf3fefaa7ULL, 0xc86ab5c39fa63440ULL },
|
||
u128 { 0xb14f98f6f0feb951ULL, 0xfa856334878fc150ULL },
|
||
u128 { 0x6ed1bf9a569f33d3ULL, 0x9c935e00d4b9d8d2ULL },
|
||
u128 { 0xa862f80ec4700c8ULL, 0xc3b8358109e84f07ULL },
|
||
u128 { 0xcd27bb612758c0faULL, 0xf4a642e14c6262c8ULL },
|
||
u128 { 0x8038d51cb897789cULL, 0x98e7e9cccfbd7dbdULL },
|
||
u128 { 0xe0470a63e6bd56c3ULL, 0xbf21e44003acdd2cULL },
|
||
u128 { 0x1858ccfce06cac74ULL, 0xeeea5d5004981478ULL },
|
||
u128 { 0xf37801e0c43ebc8ULL, 0x95527a5202df0ccbULL },
|
||
u128 { 0xd30560258f54e6baULL, 0xbaa718e68396cffdULL },
|
||
u128 { 0x47c6b82ef32a2069ULL, 0xe950df20247c83fdULL },
|
||
u128 { 0x4cdc331d57fa5441ULL, 0x91d28b7416cdd27eULL },
|
||
u128 { 0xe0133fe4adf8e952ULL, 0xb6472e511c81471dULL },
|
||
u128 { 0x58180fddd97723a6ULL, 0xe3d8f9e563a198e5ULL },
|
||
u128 { 0x570f09eaa7ea7648ULL, 0x8e679c2f5e44ff8fULL },
|
||
};
|
||
return values;
|
||
}
|
||
|
||
static constexpr auto pre_computed_powers_of_five = pre_compute_table();
|
||
|
||
static constexpr u128 power_of_five(i64 exponent)
|
||
{
|
||
return pre_computed_powers_of_five[exponent - lowest_exponent];
|
||
}
|
||
|
||
struct FloatingPointBuilder {
|
||
u64 mantissa = 0;
|
||
// This exponent is power of 2 and with the bias already added.
|
||
i32 exponent = 0;
|
||
|
||
static constexpr i32 invalid_exponent_offset = 32768;
|
||
|
||
static FloatingPointBuilder zero()
|
||
{
|
||
return { 0, 0 };
|
||
}
|
||
|
||
template<typename T>
|
||
static FloatingPointBuilder infinity()
|
||
{
|
||
return { 0, FloatingPointInfo<T>::infinity_exponent() };
|
||
}
|
||
|
||
template<typename T>
|
||
static FloatingPointBuilder nan()
|
||
{
|
||
return { 1ull << (FloatingPointInfo<T>::mantissa_bits() - 1), FloatingPointInfo<T>::infinity_exponent() };
|
||
}
|
||
|
||
template<typename T>
|
||
static FloatingPointBuilder from_value(T value)
|
||
{
|
||
using BitDetails = FloatingPointInfo<T>;
|
||
auto bits = bit_cast<typename BitDetails::SameSizeUnsigned>(value);
|
||
// we ignore negative
|
||
|
||
FloatingPointBuilder result;
|
||
i32 bias = BitDetails::mantissa_bits() + BitDetails::exponent_bias();
|
||
if ((bits & BitDetails::exponent_mask()) == 0) {
|
||
// 0 exponent -> denormal (or zero)
|
||
result.exponent = 1 - bias;
|
||
// Denormal so _DON'T_ add the implicit 1
|
||
result.mantissa = bits & BitDetails::mantissa_mask();
|
||
} else {
|
||
result.exponent = (bits & BitDetails::exponent_mask()) >> BitDetails::mantissa_bits();
|
||
result.exponent -= bias;
|
||
result.mantissa = (bits & BitDetails::mantissa_mask()) | (1ull << BitDetails::mantissa_bits());
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
template<typename T>
|
||
T to_value(bool is_negative) const
|
||
{
|
||
if constexpr (IsSame<double, T>) {
|
||
VERIFY((mantissa & 0xffe0'0000'0000'0000) == 0);
|
||
VERIFY((mantissa & 0xfff0'0000'0000'0000) == 0 || exponent == 1);
|
||
VERIFY((exponent & ~(0x7ff)) == 0);
|
||
} else {
|
||
static_assert(IsSame<float, T>);
|
||
VERIFY((mantissa & 0xff00'0000) == 0);
|
||
VERIFY((mantissa & 0xff80'0000) == 0 || exponent == 1);
|
||
VERIFY((exponent & ~(0xff)) == 0);
|
||
}
|
||
|
||
using BitSizedUnsigened = BitSizedUnsignedForFloatingPoint<T>;
|
||
|
||
BitSizedUnsigened raw_bits = mantissa;
|
||
raw_bits |= BitSizedUnsigened(exponent) << FloatingPointInfo<T>::mantissa_bits();
|
||
raw_bits |= BitSizedUnsigened(is_negative) << FloatingPointInfo<T>::sign_bit_index();
|
||
return bit_cast<T>(raw_bits);
|
||
}
|
||
};
|
||
|
||
template<typename T>
|
||
static FloatingPointBuilder parse_arbitrarily_long_floating_point(BasicParseResult& result, FloatingPointBuilder initial);
|
||
|
||
static i32 decimal_exponent_to_binary_exponent(i32 exponent)
|
||
{
|
||
return ((((152170 + 65536) * exponent) >> 16) + 63);
|
||
}
|
||
|
||
static u128 multiply(u64 a, u64 b)
|
||
{
|
||
#ifdef __SIZEOF_INT128__
|
||
unsigned __int128 result = (unsigned __int128)a * b;
|
||
u64 low = result;
|
||
u64 high = result >> 64;
|
||
return u128 { low, high };
|
||
#else
|
||
return u128 { a }.wide_multiply(u128 { b }).low;
|
||
#endif
|
||
}
|
||
|
||
template<unsigned Precision>
|
||
u128 multiplication_approximation(u64 value, i32 exponent)
|
||
{
|
||
auto z = power_of_five(exponent);
|
||
|
||
static_assert(Precision < 64);
|
||
constexpr u64 mask = NumericLimits<u64>::max() >> Precision;
|
||
|
||
auto lower_result = multiply(z.high(), value);
|
||
|
||
if ((lower_result.high() & mask) == mask) {
|
||
auto upper_result = multiply(z.low(), value);
|
||
lower_result.low() += upper_result.high();
|
||
if (upper_result.high() > lower_result.low()) {
|
||
++lower_result.high();
|
||
}
|
||
}
|
||
|
||
return lower_result;
|
||
}
|
||
|
||
template<typename T>
|
||
static FloatingPointBuilder not_enough_precision_binary_to_decimal(i64 exponent, u64 mantissa, int leading_zeros)
|
||
{
|
||
using FloatingPointRepr = FloatingPointInfo<T>;
|
||
i32 did_not_have_upper_bit = static_cast<i32>(mantissa >> 63) ^ 1;
|
||
FloatingPointBuilder answer;
|
||
answer.mantissa = mantissa << did_not_have_upper_bit;
|
||
|
||
i32 bias = FloatingPointRepr::mantissa_bits() + FloatingPointRepr::exponent_bias();
|
||
answer.exponent = decimal_exponent_to_binary_exponent(static_cast<i32>(exponent)) - leading_zeros - did_not_have_upper_bit - 62 + bias;
|
||
// Make it negative to show we need more precision.
|
||
answer.exponent -= FloatingPointBuilder::invalid_exponent_offset;
|
||
VERIFY(answer.exponent < 0);
|
||
return answer;
|
||
}
|
||
|
||
template<typename T>
|
||
static FloatingPointBuilder fallback_binary_to_decimal(u64 mantissa, i64 exponent)
|
||
{
|
||
// We should have caught huge exponents already
|
||
VERIFY(exponent >= -400 && exponent <= 400);
|
||
|
||
// Perform the initial steps of binary_to_decimal.
|
||
auto w = mantissa;
|
||
auto leading_zeros = count_leading_zeroes(mantissa);
|
||
w <<= leading_zeros;
|
||
|
||
auto product = multiplication_approximation<FloatingPointInfo<T>::mantissa_bits() + 3>(w, exponent);
|
||
|
||
return not_enough_precision_binary_to_decimal<T>(exponent, product.high(), leading_zeros);
|
||
}
|
||
|
||
template<typename T>
|
||
static FloatingPointBuilder binary_to_decimal(u64 mantissa, i64 exponent)
|
||
{
|
||
using FloatingPointRepr = FloatingPointInfo<T>;
|
||
|
||
if (mantissa == 0 || exponent < FloatingPointRepr::min_power_of_10())
|
||
return FloatingPointBuilder::zero();
|
||
|
||
// Max double value which isn't negative is xe308
|
||
if (exponent > FloatingPointRepr::max_power_of_10())
|
||
return FloatingPointBuilder::infinity<T>();
|
||
|
||
auto w = mantissa;
|
||
// Normalize the decimal significand w by shifting it so that w ∈ [2^63, 2^64)
|
||
auto leading_zeros = count_leading_zeroes(mantissa);
|
||
w <<= leading_zeros;
|
||
|
||
// We need at least mantissa bits + 1 for the implicit bit + 1 for the implicit 0 top bit and one extra for rounding
|
||
u128 approximation_of_product_with_power_of_five = multiplication_approximation<FloatingPointRepr::mantissa_bits() + 3>(w, exponent);
|
||
|
||
// The paper (and code of fastfloat/fast_float as of writing) mention that the low part
|
||
// of approximation_of_product_with_power_of_five can be 2^64 - 1 here in which case we need more
|
||
// precision if the exponent lies outside of [-27, 55]. However the authors of the paper have
|
||
// shown that this case cannot actually occur. See https://github.com/fastfloat/fast_float/issues/146#issuecomment-1262527329
|
||
|
||
u8 upperbit = approximation_of_product_with_power_of_five.high() >> 63;
|
||
auto real_mantissa = approximation_of_product_with_power_of_five.high() >> (upperbit + 64 - FloatingPointRepr::mantissa_bits() - 3);
|
||
|
||
// We immediately normalize the exponent to 0 - max else we have to add the bias in most following calculations
|
||
i32 power_of_two_with_bias = decimal_exponent_to_binary_exponent(exponent) - leading_zeros + upperbit + FloatingPointRepr::exponent_bias();
|
||
|
||
if (power_of_two_with_bias <= 0) {
|
||
// If the exponent is less than the bias we might have a denormal on our hands
|
||
// A denormal is a float with exponent zero, which means it doesn't have the implicit
|
||
// 1 at the top of the mantissa.
|
||
|
||
// If the top bit would be below the bottom of the mantissa we have to round to zero
|
||
if (power_of_two_with_bias <= -63)
|
||
return FloatingPointBuilder::zero();
|
||
|
||
// Otherwise, we have to shift the mantissa to be a denormal
|
||
auto s = -power_of_two_with_bias + 1;
|
||
real_mantissa = real_mantissa >> s;
|
||
|
||
// And then round ties to even
|
||
real_mantissa += real_mantissa & 1;
|
||
real_mantissa >>= 1;
|
||
|
||
// Check for subnormal by checking if the 53th bit of the mantissa it set in which case exponent is 1 not 0
|
||
// It is only a real subnormal if the top bit isn't set
|
||
power_of_two_with_bias = real_mantissa < (1ull << FloatingPointRepr::mantissa_bits()) ? 0 : 1;
|
||
|
||
return { real_mantissa, power_of_two_with_bias };
|
||
}
|
||
|
||
if (approximation_of_product_with_power_of_five.low() <= 1 && (real_mantissa & 0b11) == 0b01
|
||
&& exponent >= FloatingPointRepr::min_exponent_round_to_even()
|
||
&& exponent <= FloatingPointRepr::max_exponent_round_to_even()) {
|
||
// If the lowest bit is set but the one above it isn't this is a value exactly halfway
|
||
// between two floating points
|
||
// if (z ÷ 264 )/m is a power of two then m ← m − 1
|
||
|
||
// effectively all discard bits from z.high are 0
|
||
if (approximation_of_product_with_power_of_five.high() == (real_mantissa << (upperbit + 64 - FloatingPointRepr::mantissa_bits() - 3))) {
|
||
real_mantissa &= ~u64(1);
|
||
}
|
||
}
|
||
|
||
real_mantissa += real_mantissa & 1;
|
||
real_mantissa >>= 1;
|
||
|
||
// If we overflowed the mantissa round up the exponent
|
||
if (real_mantissa >= (2ull << FloatingPointRepr::mantissa_bits())) {
|
||
real_mantissa = 1ull << FloatingPointRepr::mantissa_bits();
|
||
++power_of_two_with_bias;
|
||
}
|
||
|
||
real_mantissa &= ~(1ull << FloatingPointRepr::mantissa_bits());
|
||
|
||
// We might have rounded exponent up to infinity
|
||
if (power_of_two_with_bias >= FloatingPointRepr::infinity_exponent())
|
||
return FloatingPointBuilder::infinity<T>();
|
||
|
||
return {
|
||
real_mantissa, power_of_two_with_bias
|
||
};
|
||
}
|
||
|
||
static constexpr u64 multiply_with_carry(u64 x, u64 y, u64& carry)
|
||
{
|
||
u128 result = (u128 { x } * y) + carry;
|
||
carry = result.high();
|
||
return result.low();
|
||
}
|
||
|
||
static constexpr u64 add_with_overflow(u64 x, u64 y, bool& did_overflow)
|
||
{
|
||
u64 value;
|
||
did_overflow = __builtin_add_overflow(x, y, &value);
|
||
return value;
|
||
}
|
||
|
||
class MinimalBigInt {
|
||
public:
|
||
MinimalBigInt() = default;
|
||
MinimalBigInt(u64 value)
|
||
{
|
||
append(value);
|
||
}
|
||
|
||
static MinimalBigInt from_decimal_floating_point(BasicParseResult const& parse_result, size_t& digits_parsed, size_t max_total_digits)
|
||
{
|
||
size_t current_word_counter = 0;
|
||
// 10**19 is the biggest power of ten which fits in 64 bit
|
||
constexpr size_t max_word_counter = max_representable_power_of_ten_in_u64;
|
||
|
||
u64 current_word = 0;
|
||
|
||
enum AddDigitResult {
|
||
DidNotHitMaxDigits,
|
||
HitMaxDigits,
|
||
};
|
||
|
||
auto does_truncate_non_zero = [](char const* parse_head, char const* parse_end) {
|
||
while (parse_end - parse_head >= 8) {
|
||
static_assert('0' == 0x30);
|
||
|
||
if (read_eight_digits(parse_head) != 0x3030303030303030)
|
||
return true;
|
||
|
||
parse_head += 8;
|
||
}
|
||
|
||
while (parse_head != parse_end) {
|
||
if (*parse_head != '0')
|
||
return true;
|
||
|
||
++parse_head;
|
||
}
|
||
|
||
return false;
|
||
};
|
||
|
||
MinimalBigInt value;
|
||
auto add_digits = [&](StringView digits, bool check_fraction_for_truncation = false) {
|
||
char const* parse_head = digits.characters_without_null_termination();
|
||
char const* parse_end = digits.characters_without_null_termination() + digits.length();
|
||
|
||
if (digits_parsed == 0) {
|
||
// Skip all leading zeros as long as we haven't hit a non zero
|
||
while (parse_head != parse_end && *parse_head == '0')
|
||
++parse_head;
|
||
}
|
||
|
||
while (parse_head != parse_end) {
|
||
while (max_word_counter - current_word_counter >= 8
|
||
&& parse_end - parse_head >= 8
|
||
&& max_total_digits - digits_parsed >= 8) {
|
||
|
||
current_word = current_word * 100'000'000 + eight_digits_to_value(read_eight_digits(parse_head));
|
||
|
||
digits_parsed += 8;
|
||
current_word_counter += 8;
|
||
parse_head += 8;
|
||
}
|
||
|
||
while (current_word_counter < max_word_counter
|
||
&& parse_head != parse_end
|
||
&& digits_parsed < max_total_digits) {
|
||
|
||
current_word = current_word * 10 + (*parse_head - '0');
|
||
|
||
++digits_parsed;
|
||
++current_word_counter;
|
||
++parse_head;
|
||
}
|
||
|
||
if (digits_parsed == max_total_digits) {
|
||
// Check if we are leaving behind any non zero
|
||
bool truncated = does_truncate_non_zero(parse_head, parse_end);
|
||
if (auto fraction = parse_result.fractional_part; check_fraction_for_truncation && !fraction.is_empty())
|
||
truncated = truncated || does_truncate_non_zero(fraction.characters_without_null_termination(), fraction.characters_without_null_termination() + fraction.length());
|
||
|
||
// If we truncated we just pretend there is another 1 after the already parsed digits
|
||
|
||
if (truncated && current_word_counter != max_word_counter) {
|
||
// If it still fits in the current add it there, this saves a wide multiply
|
||
current_word = current_word * 10 + 1;
|
||
++current_word_counter;
|
||
truncated = false;
|
||
}
|
||
value.add_digits(current_word, current_word_counter);
|
||
|
||
// If it didn't fit just do * 10 + 1
|
||
if (truncated)
|
||
value.add_digits(1, 1);
|
||
|
||
return HitMaxDigits;
|
||
} else {
|
||
value.add_digits(current_word, current_word_counter);
|
||
current_word = 0;
|
||
current_word_counter = 0;
|
||
}
|
||
}
|
||
|
||
return DidNotHitMaxDigits;
|
||
};
|
||
|
||
if (add_digits(parse_result.whole_part, true) == HitMaxDigits)
|
||
return value;
|
||
|
||
add_digits(parse_result.fractional_part);
|
||
|
||
return value;
|
||
}
|
||
|
||
u64 top_64_bits(bool& has_truncated_bits) const
|
||
{
|
||
if (m_used_length == 0)
|
||
return 0;
|
||
|
||
// Top word should be non-zero
|
||
VERIFY(m_words[m_used_length - 1] != 0);
|
||
|
||
auto leading_zeros = count_leading_zeroes(m_words[m_used_length - 1]);
|
||
if (m_used_length == 1)
|
||
return m_words[0] << leading_zeros;
|
||
|
||
for (size_t i = 0; i < m_used_length - 2; i++) {
|
||
if (m_words[i] != 0) {
|
||
has_truncated_bits = true;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (leading_zeros == 0) {
|
||
// Shift of 64+ is undefined so this has to be a separate case
|
||
has_truncated_bits |= m_words[m_used_length - 2] != 0;
|
||
return m_words[m_used_length - 1] << leading_zeros;
|
||
}
|
||
|
||
auto bits_from_second = 64 - leading_zeros;
|
||
has_truncated_bits |= (m_words[m_used_length - 2] << leading_zeros) != 0;
|
||
return (m_words[m_used_length - 1] << leading_zeros) | (m_words[m_used_length - 2] >> bits_from_second);
|
||
}
|
||
|
||
i32 size_in_bits() const
|
||
{
|
||
if (m_used_length == 0)
|
||
return 0;
|
||
// This is guaranteed to be at most max_size_in_words * 64 so not above i32 max
|
||
return static_cast<i32>(64 * (m_used_length)-count_leading_zeroes(m_words[m_used_length - 1]));
|
||
}
|
||
|
||
void multiply_with_power_of_10(u32 exponent)
|
||
{
|
||
multiply_with_power_of_5(exponent);
|
||
multiply_with_power_of_2(exponent);
|
||
}
|
||
|
||
void multiply_with_power_of_5(u32 exponent)
|
||
{
|
||
// FIXME: We might be able to store a bigger power of 5 but this would
|
||
// require a wide multiply, so perhaps using u4096 would be
|
||
// better to get wide multiply and not duplicate logic.
|
||
static constexpr Array<u64, 28> power_of_5 = {
|
||
1ul,
|
||
5ul,
|
||
25ul,
|
||
125ul,
|
||
625ul,
|
||
3125ul,
|
||
15625ul,
|
||
78125ul,
|
||
390625ul,
|
||
1953125ul,
|
||
9765625ul,
|
||
48828125ul,
|
||
244140625ul,
|
||
1220703125ul,
|
||
6103515625ul,
|
||
30517578125ul,
|
||
152587890625ul,
|
||
762939453125ul,
|
||
3814697265625ul,
|
||
19073486328125ul,
|
||
95367431640625ul,
|
||
476837158203125ul,
|
||
2384185791015625ul,
|
||
11920928955078125ul,
|
||
59604644775390625ul,
|
||
298023223876953125ul,
|
||
1490116119384765625ul,
|
||
7450580596923828125ul,
|
||
};
|
||
|
||
static constexpr u32 max_step = power_of_5.size() - 1;
|
||
static constexpr u64 max_power = power_of_5[max_step];
|
||
|
||
while (exponent >= max_step) {
|
||
multiply_with_small(max_power);
|
||
exponent -= max_step;
|
||
}
|
||
|
||
if (exponent > 0)
|
||
multiply_with_small(power_of_5[exponent]);
|
||
}
|
||
|
||
void multiply_with_power_of_2(u32 exponent)
|
||
{
|
||
// It's cheaper to shift bits first since that creates at most 1 new word
|
||
shift_bits(exponent % 64);
|
||
shift_words(exponent / 64);
|
||
}
|
||
|
||
enum class CompareResult {
|
||
Equal,
|
||
GreaterThan,
|
||
LessThan
|
||
};
|
||
|
||
CompareResult compare_to(MinimalBigInt const& other) const
|
||
{
|
||
if (m_used_length > other.m_used_length)
|
||
return CompareResult::GreaterThan;
|
||
|
||
if (m_used_length < other.m_used_length)
|
||
return CompareResult::LessThan;
|
||
|
||
// Now we know it's the same size
|
||
for (size_t i = m_used_length; i > 0; --i) {
|
||
auto our_word = m_words[i - 1];
|
||
auto their_word = other.m_words[i - 1];
|
||
|
||
if (our_word > their_word)
|
||
return CompareResult::GreaterThan;
|
||
if (their_word > our_word)
|
||
return CompareResult::LessThan;
|
||
}
|
||
|
||
return CompareResult::Equal;
|
||
}
|
||
|
||
private:
|
||
void shift_words(u32 amount)
|
||
{
|
||
if (amount == 0)
|
||
return;
|
||
|
||
VERIFY(amount + m_used_length <= max_words_needed);
|
||
|
||
for (size_t i = m_used_length + amount - 1; i > amount - 1; --i)
|
||
m_words[i] = m_words[i - amount];
|
||
|
||
for (size_t i = 0; i < amount; ++i)
|
||
m_words[i] = 0;
|
||
|
||
m_used_length += amount;
|
||
}
|
||
|
||
void shift_bits(u32 amount)
|
||
{
|
||
if (amount == 0)
|
||
return;
|
||
|
||
VERIFY(amount < 64);
|
||
|
||
u32 inverse = 64 - amount;
|
||
u64 last_word = 0;
|
||
|
||
for (size_t i = 0; i < m_used_length; ++i) {
|
||
u64 word = m_words[i];
|
||
m_words[i] = (word << amount) | (last_word >> inverse);
|
||
last_word = word;
|
||
}
|
||
|
||
u64 carry = last_word >> inverse;
|
||
if (carry != 0)
|
||
append(carry);
|
||
}
|
||
|
||
static constexpr Array<u64, 20> powers_of_ten_uint64 = {
|
||
1UL, 10UL, 100UL, 1000UL, 10000UL, 100000UL, 1000000UL, 10000000UL, 100000000UL,
|
||
1000000000UL, 10000000000UL, 100000000000UL, 1000000000000UL, 10000000000000UL,
|
||
100000000000000UL, 1000000000000000UL, 10000000000000000UL, 100000000000000000UL,
|
||
1000000000000000000UL, 10000000000000000000UL
|
||
};
|
||
|
||
void multiply_with_small(u64 value)
|
||
{
|
||
u64 carry = 0;
|
||
for (size_t i = 0; i < m_used_length; ++i)
|
||
m_words[i] = multiply_with_carry(m_words[i], value, carry);
|
||
|
||
if (carry != 0)
|
||
append(carry);
|
||
}
|
||
|
||
void add_small(u64 value)
|
||
{
|
||
bool overflow;
|
||
size_t index = 0;
|
||
while (value != 0 && index < m_used_length) {
|
||
m_words[index] = add_with_overflow(m_words[index], value, overflow);
|
||
|
||
value = overflow ? 1 : 0;
|
||
++index;
|
||
}
|
||
|
||
if (value != 0)
|
||
append(value);
|
||
}
|
||
|
||
void add_digits(u64 value, size_t digits_for_value)
|
||
{
|
||
VERIFY(digits_for_value < powers_of_ten_uint64.size());
|
||
|
||
multiply_with_small(powers_of_ten_uint64[digits_for_value]);
|
||
add_small(value);
|
||
}
|
||
|
||
void append(u64 word)
|
||
{
|
||
VERIFY(m_used_length <= max_words_needed);
|
||
m_words[m_used_length] = word;
|
||
++m_used_length;
|
||
}
|
||
|
||
// The max valid words we might need are log2(10^(769 + 342)), max digits + max exponent
|
||
static constexpr size_t max_words_needed = 58;
|
||
|
||
size_t m_used_length = 0;
|
||
|
||
// FIXME: This is an array just to avoid allocations, but the max size is only needed for
|
||
// massive amount of digits, so a smaller vector would work for most cases.
|
||
Array<u64, max_words_needed> m_words {};
|
||
};
|
||
|
||
static bool round_nearest_tie_even(FloatingPointBuilder& value, bool did_truncate_bits, i32 shift)
|
||
{
|
||
VERIFY(shift == 11 || shift == 40);
|
||
u64 mask = (1ull << shift) - 1;
|
||
u64 halfway = 1ull << (shift - 1);
|
||
|
||
u64 truncated_bits = value.mantissa & mask;
|
||
bool is_halfway = truncated_bits == halfway;
|
||
bool is_above = truncated_bits > halfway;
|
||
|
||
value.mantissa >>= shift;
|
||
value.exponent += shift;
|
||
|
||
bool is_odd = (value.mantissa & 1) == 1;
|
||
return is_above || (is_halfway && did_truncate_bits) || (is_halfway && is_odd);
|
||
}
|
||
|
||
template<typename T, typename Callback>
|
||
static void round(FloatingPointBuilder& value, Callback&& should_round_up)
|
||
{
|
||
using FloatingRepr = FloatingPointInfo<T>;
|
||
|
||
i32 mantissa_shift = 64 - FloatingRepr::mantissa_bits() - 1;
|
||
if (-value.exponent >= mantissa_shift) {
|
||
// This is a denormal so we have to shift????
|
||
mantissa_shift = min(-value.exponent + 1, 64);
|
||
if (should_round_up(value, mantissa_shift))
|
||
++value.mantissa;
|
||
|
||
value.exponent = (value.mantissa < (1ull << FloatingRepr::mantissa_bits())) ? 0 : 1;
|
||
return;
|
||
}
|
||
|
||
if (should_round_up(value, mantissa_shift))
|
||
++value.mantissa;
|
||
|
||
// Mantissa might have been rounded so if it overflowed increase the exponent
|
||
if (value.mantissa >= (2ull << FloatingRepr::mantissa_bits())) {
|
||
value.mantissa = 0;
|
||
++value.exponent;
|
||
} else {
|
||
// Clear the implicit top bit
|
||
value.mantissa &= ~(1ull << FloatingRepr::mantissa_bits());
|
||
}
|
||
|
||
// If we also overflowed the exponent make it infinity!
|
||
if (value.exponent >= FloatingRepr::infinity_exponent()) {
|
||
value.exponent = FloatingRepr::infinity_exponent();
|
||
value.mantissa = 0;
|
||
}
|
||
}
|
||
|
||
template<typename T>
|
||
static FloatingPointBuilder build_positive_double(MinimalBigInt& mantissa, i32 exponent)
|
||
{
|
||
mantissa.multiply_with_power_of_10(exponent);
|
||
|
||
FloatingPointBuilder result {};
|
||
bool should_round_up_ties = false;
|
||
// First we get the 64 most significant bits WARNING not masked to real mantissa yet
|
||
result.mantissa = mantissa.top_64_bits(should_round_up_ties);
|
||
|
||
i32 bias = FloatingPointInfo<T>::mantissa_bits() + FloatingPointInfo<T>::exponent_bias();
|
||
result.exponent = mantissa.size_in_bits() - 64 + bias;
|
||
|
||
round<T>(result, [should_round_up_ties](FloatingPointBuilder& value, i32 shift) {
|
||
return round_nearest_tie_even(value, should_round_up_ties, shift);
|
||
});
|
||
return result;
|
||
}
|
||
|
||
template<ParseableFloatingPoint T>
|
||
static FloatingPointBuilder build_negative_exponent_double(MinimalBigInt& mantissa, i32 exponent, FloatingPointBuilder initial)
|
||
{
|
||
VERIFY(exponent < 0);
|
||
|
||
// Building a fraction from a big integer is harder to understand
|
||
// But fundamentely we have mantissa * 10^-e and so divide by 5^f
|
||
|
||
auto parts_copy = initial;
|
||
round<T>(parts_copy, [](FloatingPointBuilder& value, i32 shift) {
|
||
if (shift == 64)
|
||
value.mantissa = 0;
|
||
else
|
||
value.mantissa >>= shift;
|
||
|
||
value.exponent += shift;
|
||
|
||
return false;
|
||
});
|
||
|
||
T rounded_down_double_value = parts_copy.template to_value<T>(false);
|
||
auto exact_halfway_builder = FloatingPointBuilder::from_value(rounded_down_double_value);
|
||
// halfway is exactly just the next bit 1 (rest implicit zeros)
|
||
exact_halfway_builder.mantissa <<= 1;
|
||
exact_halfway_builder.mantissa += 1;
|
||
--exact_halfway_builder.exponent;
|
||
|
||
MinimalBigInt rounded_down_full_mantissa { exact_halfway_builder.mantissa };
|
||
|
||
// Scale halfway up with 5**(-e)
|
||
if (u32 power_of_5 = -exponent; power_of_5 != 0)
|
||
rounded_down_full_mantissa.multiply_with_power_of_5(power_of_5);
|
||
|
||
i32 power_of_2 = exact_halfway_builder.exponent - exponent;
|
||
if (power_of_2 > 0) {
|
||
// halfway has lower exponent scale up to real exponent
|
||
rounded_down_full_mantissa.multiply_with_power_of_2(power_of_2);
|
||
} else if (power_of_2 < 0) {
|
||
// halfway has higher exponent scale original mantissa up to real halfway
|
||
mantissa.multiply_with_power_of_2(-power_of_2);
|
||
}
|
||
|
||
auto compared_to_halfway = mantissa.compare_to(rounded_down_full_mantissa);
|
||
|
||
round<T>(initial, [compared_to_halfway](FloatingPointBuilder& value, i32 shift) {
|
||
if (shift == 64) {
|
||
value.mantissa = 0;
|
||
} else {
|
||
value.mantissa >>= shift;
|
||
}
|
||
value.exponent += shift;
|
||
|
||
if (compared_to_halfway == MinimalBigInt::CompareResult::GreaterThan)
|
||
return true;
|
||
if (compared_to_halfway == MinimalBigInt::CompareResult::LessThan)
|
||
return false;
|
||
|
||
return (value.mantissa & 1) == 1;
|
||
});
|
||
|
||
return initial;
|
||
}
|
||
|
||
template<typename T>
|
||
static FloatingPointBuilder parse_arbitrarily_long_floating_point(BasicParseResult& result, FloatingPointBuilder initial)
|
||
{
|
||
VERIFY(initial.exponent < 0);
|
||
initial.exponent += FloatingPointBuilder::invalid_exponent_offset;
|
||
|
||
VERIFY(result.exponent >= NumericLimits<i32>::min() && result.exponent <= NumericLimits<i32>::max());
|
||
i32 exponent = static_cast<i32>(result.exponent);
|
||
{
|
||
u64 mantissa_copy = result.mantissa;
|
||
|
||
while (mantissa_copy >= 10000) {
|
||
mantissa_copy /= 10000;
|
||
exponent += 4;
|
||
}
|
||
|
||
while (mantissa_copy >= 10) {
|
||
mantissa_copy /= 10;
|
||
++exponent;
|
||
}
|
||
}
|
||
|
||
size_t digits = 0;
|
||
|
||
constexpr auto max_digits_to_parse = FloatingPointInfo<T>::max_possible_digits_needed_for_parsing();
|
||
|
||
// Reparse mantissa into big int
|
||
auto mantissa = MinimalBigInt::from_decimal_floating_point(result, digits, max_digits_to_parse);
|
||
|
||
VERIFY(digits <= 1024);
|
||
|
||
exponent += 1 - static_cast<i32>(digits);
|
||
|
||
if (exponent >= 0)
|
||
return build_positive_double<T>(mantissa, exponent);
|
||
|
||
return build_negative_exponent_double<T>(mantissa, exponent, initial);
|
||
}
|
||
|
||
template<FloatingPoint T>
|
||
T parse_result_to_value(BasicParseResult& parse_result)
|
||
{
|
||
using FloatingPointRepr = FloatingPointInfo<T>;
|
||
|
||
if (parse_result.mantissa <= u64(2) << FloatingPointRepr::mantissa_bits()
|
||
&& parse_result.exponent >= -FloatingPointRepr::max_exact_power_of_10() && parse_result.exponent <= FloatingPointRepr::max_exact_power_of_10()
|
||
&& !parse_result.more_than_19_digits_with_overflow) {
|
||
|
||
T value = parse_result.mantissa;
|
||
VERIFY(u64(value) == parse_result.mantissa);
|
||
|
||
if (parse_result.exponent < 0)
|
||
value = value / FloatingPointRepr::power_of_ten(-parse_result.exponent);
|
||
else
|
||
value = value * FloatingPointRepr::power_of_ten(parse_result.exponent);
|
||
|
||
if (parse_result.negative)
|
||
value = -value;
|
||
|
||
return value;
|
||
}
|
||
|
||
auto floating_point_parts = binary_to_decimal<T>(parse_result.mantissa, parse_result.exponent);
|
||
if (parse_result.more_than_19_digits_with_overflow && floating_point_parts.exponent >= 0) {
|
||
auto rounded_up_double_build = binary_to_decimal<T>(parse_result.mantissa + 1, parse_result.exponent);
|
||
if (floating_point_parts.mantissa != rounded_up_double_build.mantissa || floating_point_parts.exponent != rounded_up_double_build.exponent) {
|
||
floating_point_parts = fallback_binary_to_decimal<T>(parse_result.mantissa, parse_result.exponent);
|
||
VERIFY(floating_point_parts.exponent < 0);
|
||
}
|
||
}
|
||
|
||
if (floating_point_parts.exponent < 0) {
|
||
// Invalid have to parse perfectly
|
||
floating_point_parts = parse_arbitrarily_long_floating_point<T>(parse_result, floating_point_parts);
|
||
}
|
||
|
||
return floating_point_parts.template to_value<T>(parse_result.negative);
|
||
}
|
||
|
||
template<FloatingPoint T>
|
||
constexpr FloatingPointParseResults<T> parse_result_to_full_result(BasicParseResult parse_result)
|
||
{
|
||
if (!parse_result.valid)
|
||
return { nullptr, FloatingPointError::NoOrInvalidInput, __builtin_nan("") };
|
||
|
||
FloatingPointParseResults<T> full_result {};
|
||
full_result.end_ptr = parse_result.last_parsed;
|
||
|
||
// We special case this to be able to differentiate between 0 and values rounded down to 0
|
||
if (parse_result.mantissa == 0) {
|
||
full_result.value = parse_result.negative ? -0. : 0.;
|
||
return full_result;
|
||
}
|
||
|
||
full_result.value = parse_result_to_value<T>(parse_result);
|
||
|
||
// The only way we can get infinity is from rounding up/down to it.
|
||
if (__builtin_isinf(full_result.value))
|
||
full_result.error = FloatingPointError::OutOfRange;
|
||
else if (full_result.value == T(0.))
|
||
full_result.error = FloatingPointError::RoundedDownToZero;
|
||
|
||
return full_result;
|
||
}
|
||
|
||
template<FloatingPoint T>
|
||
FloatingPointParseResults<T> parse_first_floating_point(char const* start, char const* end)
|
||
{
|
||
auto parse_result = parse_numbers(
|
||
start,
|
||
[end](char const* head) { return head == end; },
|
||
[end](char const* head) { return head - end >= 8; });
|
||
|
||
return parse_result_to_full_result<T>(parse_result);
|
||
}
|
||
|
||
template FloatingPointParseResults<double> parse_first_floating_point(char const* start, char const* end);
|
||
|
||
template FloatingPointParseResults<float> parse_first_floating_point(char const* start, char const* end);
|
||
|
||
template<FloatingPoint T>
|
||
FloatingPointParseResults<T> parse_first_floating_point_until_zero_character(char const* start)
|
||
{
|
||
auto parse_result = parse_numbers(
|
||
start,
|
||
[](char const* head) { return *head == '\0'; },
|
||
[](char const*) { return false; });
|
||
|
||
return parse_result_to_full_result<T>(parse_result);
|
||
}
|
||
|
||
template FloatingPointParseResults<double> parse_first_floating_point_until_zero_character(char const* start);
|
||
|
||
template FloatingPointParseResults<float> parse_first_floating_point_until_zero_character(char const* start);
|
||
|
||
template<FloatingPoint T>
|
||
Optional<T> parse_floating_point_completely(char const* start, char const* end)
|
||
{
|
||
auto parse_result = parse_numbers(
|
||
start,
|
||
[end](char const* head) { return head == end; },
|
||
[end](char const* head) { return head - end >= 8; });
|
||
|
||
if (!parse_result.valid || parse_result.last_parsed != end)
|
||
return {};
|
||
|
||
return parse_result_to_value<T>(parse_result);
|
||
}
|
||
|
||
template Optional<double> parse_floating_point_completely(char const* start, char const* end);
|
||
|
||
template Optional<float> parse_floating_point_completely(char const* start, char const* end);
|
||
|
||
struct HexFloatParseResult {
|
||
bool is_negative = false;
|
||
bool valid = false;
|
||
char const* last_parsed = nullptr;
|
||
u64 mantissa = 0;
|
||
i64 exponent = 0;
|
||
};
|
||
|
||
static HexFloatParseResult parse_hexfloat(char const* start)
|
||
{
|
||
HexFloatParseResult result {};
|
||
if (start == nullptr || *start == '\0')
|
||
return result;
|
||
|
||
char const* parse_head = start;
|
||
bool any_digits = false;
|
||
bool truncated_non_zero = false;
|
||
|
||
if (*parse_head == '-') {
|
||
result.is_negative = true;
|
||
++parse_head;
|
||
|
||
if (*parse_head == '\0' || (!is_ascii_hex_digit(*parse_head) && *parse_head != floating_point_decimal_separator))
|
||
return result;
|
||
} else if (*parse_head == '+') {
|
||
++parse_head;
|
||
|
||
if (*parse_head == '\0' || (!is_ascii_hex_digit(*parse_head) && *parse_head != floating_point_decimal_separator))
|
||
return result;
|
||
}
|
||
if (*parse_head == '0' && (*(parse_head + 1) != '\0') && (*(parse_head + 1) == 'x' || *(parse_head + 1) == 'X')) {
|
||
// Skip potential 0[xX], we have to do this here since the sign comes at the front
|
||
parse_head += 2;
|
||
}
|
||
|
||
auto add_mantissa_digit = [&] {
|
||
any_digits = true;
|
||
|
||
// We assume you already checked this is actually a digit
|
||
auto digit = parse_ascii_hex_digit(*parse_head);
|
||
|
||
// Because the power of sixteen is just scaling of power of two we don't
|
||
// need to keep all the remaining digits beyond the first 52 bits, just because
|
||
// it's easy we store the first 16 digits. However for rounding we do need to parse
|
||
// all the digits and keep track if we see any non zero one.
|
||
if (result.mantissa < (1ull << 60)) {
|
||
result.mantissa = (result.mantissa * 16) + digit;
|
||
return true;
|
||
}
|
||
|
||
if (digit != 0)
|
||
truncated_non_zero = true;
|
||
|
||
return false;
|
||
};
|
||
|
||
while (*parse_head != '\0' && is_ascii_hex_digit(*parse_head)) {
|
||
add_mantissa_digit();
|
||
|
||
++parse_head;
|
||
}
|
||
|
||
if (*parse_head != '\0' && *parse_head == floating_point_decimal_separator) {
|
||
++parse_head;
|
||
i64 digits_after_separator = 0;
|
||
while (*parse_head != '\0' && is_ascii_hex_digit(*parse_head)) {
|
||
// Track how many characters we actually read into the mantissa
|
||
digits_after_separator += add_mantissa_digit() ? 1 : 0;
|
||
|
||
++parse_head;
|
||
}
|
||
|
||
// We parsed x digits after the dot so need to multiply with 2^(-x * 4)
|
||
// Since every digit is 4 bits
|
||
result.exponent = -digits_after_separator * 4;
|
||
}
|
||
|
||
if (!any_digits)
|
||
return result;
|
||
|
||
if (*parse_head != '\0' && (*parse_head == 'p' || *parse_head == 'P')) {
|
||
[&] {
|
||
auto const* head_before_p = parse_head;
|
||
ArmedScopeGuard reset_ptr { [&] { parse_head = head_before_p; } };
|
||
++parse_head;
|
||
|
||
if (*parse_head == '\0')
|
||
return;
|
||
|
||
bool exponent_is_negative = false;
|
||
i64 explicit_exponent = 0;
|
||
|
||
if (*parse_head == '-' || *parse_head == '+') {
|
||
exponent_is_negative = *parse_head == '-';
|
||
++parse_head;
|
||
if (*parse_head == '\0')
|
||
return;
|
||
}
|
||
|
||
if (!is_ascii_digit(*parse_head))
|
||
return;
|
||
|
||
// We have at least one digit (with optional preceding sign) so we will not reset
|
||
reset_ptr.disarm();
|
||
|
||
while (*parse_head != '\0' && is_ascii_digit(*parse_head)) {
|
||
// If we hit exponent overflow the number is so huge we are in trouble anyway, see
|
||
// a comment in parse_numbers.
|
||
if (explicit_exponent < 0x10000000)
|
||
explicit_exponent = 10 * explicit_exponent + (*parse_head - '0');
|
||
++parse_head;
|
||
}
|
||
|
||
if (exponent_is_negative)
|
||
explicit_exponent = -explicit_exponent;
|
||
|
||
result.exponent += explicit_exponent;
|
||
}();
|
||
}
|
||
|
||
result.valid = true;
|
||
|
||
// Round up exactly halfway with truncated non zeros, but don't if it would cascade up
|
||
if (truncated_non_zero && (result.mantissa & 0xF) != 0xF) {
|
||
VERIFY(result.mantissa >= 0x1000'0000'0000'0000);
|
||
result.mantissa |= 1;
|
||
}
|
||
|
||
result.last_parsed = parse_head;
|
||
|
||
return result;
|
||
}
|
||
|
||
template<FloatingPoint T>
|
||
static FloatingPointBuilder build_hex_float(HexFloatParseResult& parse_result)
|
||
{
|
||
using FloatingPointRepr = FloatingPointInfo<T>;
|
||
VERIFY(parse_result.mantissa != 0);
|
||
|
||
if (parse_result.exponent >= FloatingPointRepr::infinity_exponent())
|
||
return FloatingPointBuilder::infinity<T>();
|
||
|
||
auto leading_zeros = count_leading_zeroes(parse_result.mantissa);
|
||
u64 normalized_mantissa = parse_result.mantissa << leading_zeros;
|
||
|
||
// No need to multiply with some power of 5 here the exponent is already a power of 2.
|
||
|
||
u8 upperbit = normalized_mantissa >> 63;
|
||
FloatingPointBuilder parts;
|
||
parts.mantissa = normalized_mantissa >> (upperbit + 64 - FloatingPointRepr::mantissa_bits() - 3);
|
||
|
||
parts.exponent = parse_result.exponent + upperbit - leading_zeros + FloatingPointRepr::exponent_bias() + 62;
|
||
|
||
if (parts.exponent <= 0) {
|
||
// subnormal
|
||
if (-parts.exponent + 1 >= 64) {
|
||
parts.mantissa = 0;
|
||
parts.exponent = 0;
|
||
return parts;
|
||
}
|
||
|
||
parts.mantissa >>= -parts.exponent + 1;
|
||
parts.mantissa += parts.mantissa & 1;
|
||
parts.mantissa >>= 1;
|
||
|
||
if (parts.mantissa < (1ull << FloatingPointRepr::mantissa_bits())) {
|
||
parts.exponent = 0;
|
||
} else {
|
||
parts.exponent = 1;
|
||
}
|
||
|
||
return parts;
|
||
}
|
||
|
||
// Here we don't have to only do this halfway check for some exponents
|
||
if ((parts.mantissa & 0b11) == 0b01) {
|
||
// effectively all discard bits from z.high are 0
|
||
if (normalized_mantissa == (parts.mantissa << (upperbit + 64 - FloatingPointRepr::mantissa_bits() - 3)))
|
||
parts.mantissa &= ~u64(1);
|
||
}
|
||
|
||
parts.mantissa += parts.mantissa & 1;
|
||
parts.mantissa >>= 1;
|
||
|
||
if (parts.mantissa >= (2ull << FloatingPointRepr::mantissa_bits())) {
|
||
parts.mantissa = 1ull << FloatingPointRepr::mantissa_bits();
|
||
++parts.exponent;
|
||
}
|
||
|
||
parts.mantissa &= ~(1ull << FloatingPointRepr::mantissa_bits());
|
||
|
||
if (parts.exponent >= FloatingPointRepr::infinity_exponent()) {
|
||
parts.mantissa = 0;
|
||
parts.exponent = FloatingPointRepr::infinity_exponent();
|
||
}
|
||
|
||
return parts;
|
||
}
|
||
|
||
template<FloatingPoint T>
|
||
FloatingPointParseResults<T> parse_first_hexfloat_until_zero_character(char const* start)
|
||
{
|
||
using FloatingPointRepr = FloatingPointInfo<T>;
|
||
auto parse_result = parse_hexfloat(start);
|
||
|
||
if (!parse_result.valid)
|
||
return { nullptr, FloatingPointError::NoOrInvalidInput, __builtin_nan("") };
|
||
|
||
FloatingPointParseResults<T> full_result {};
|
||
full_result.end_ptr = parse_result.last_parsed;
|
||
|
||
// We special case this to be able to differentiate between 0 and values rounded down to 0
|
||
|
||
if (parse_result.mantissa == 0) {
|
||
full_result.value = 0.;
|
||
return full_result;
|
||
}
|
||
|
||
auto result = build_hex_float<T>(parse_result);
|
||
full_result.value = result.template to_value<T>(parse_result.is_negative);
|
||
|
||
if (result.exponent == FloatingPointRepr::infinity_exponent()) {
|
||
VERIFY(result.mantissa == 0);
|
||
full_result.error = FloatingPointError::OutOfRange;
|
||
} else if (result.mantissa == 0 && result.exponent == 0) {
|
||
full_result.error = FloatingPointError::RoundedDownToZero;
|
||
}
|
||
|
||
return full_result;
|
||
}
|
||
|
||
template FloatingPointParseResults<double> parse_first_hexfloat_until_zero_character(char const* start);
|
||
|
||
template FloatingPointParseResults<float> parse_first_hexfloat_until_zero_character(char const* start);
|
||
|
||
}
|