Improve dump_integer performance by implementing a more efficient int2ascii
This commits implements a faster int2ascii inspired by "Fastware" talk given by Andrei Alexandrescu. See: https://www.youtube.com/watch?v=o4-CwDo2zpg
This commit is contained in:
Isaac Nickaein
parent
676c847c55
commit
6503e83e74
2 changed files with 190 additions and 30 deletions
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@ -527,6 +527,40 @@ class serializer
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}
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}
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/*!
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@brief count digits
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Count the number of decimal (base 10) digits for an input unsigned integer.
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@param[in] x unsigned integer number to count its digits
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@return number of decimal digits
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*/
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inline unsigned int count_digits(number_unsigned_t x) noexcept
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{
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unsigned int n_digits = 1;
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for (;;)
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{
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if (x < 10)
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{
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return n_digits;
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}
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if (x < 100)
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{
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return n_digits + 1;
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}
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if (x < 1000)
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{
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return n_digits + 2;
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}
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if (x < 10000)
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{
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return n_digits + 3;
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}
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x = x / 10000u;
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n_digits += 4;
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}
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}
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/*!
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@brief dump an integer
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@ -542,6 +576,22 @@ class serializer
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int> = 0>
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void dump_integer(NumberType x)
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{
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static constexpr std::array<std::array<char, 2>, 100> digits_to_99
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{
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{
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{'0', '0'}, {'0', '1'}, {'0', '2'}, {'0', '3'}, {'0', '4'}, {'0', '5'}, {'0', '6'}, {'0', '7'}, {'0', '8'}, {'0', '9'},
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{'1', '0'}, {'1', '1'}, {'1', '2'}, {'1', '3'}, {'1', '4'}, {'1', '5'}, {'1', '6'}, {'1', '7'}, {'1', '8'}, {'1', '9'},
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{'2', '0'}, {'2', '1'}, {'2', '2'}, {'2', '3'}, {'2', '4'}, {'2', '5'}, {'2', '6'}, {'2', '7'}, {'2', '8'}, {'2', '9'},
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{'3', '0'}, {'3', '1'}, {'3', '2'}, {'3', '3'}, {'3', '4'}, {'3', '5'}, {'3', '6'}, {'3', '7'}, {'3', '8'}, {'3', '9'},
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{'4', '0'}, {'4', '1'}, {'4', '2'}, {'4', '3'}, {'4', '4'}, {'4', '5'}, {'4', '6'}, {'4', '7'}, {'4', '8'}, {'4', '9'},
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{'5', '0'}, {'5', '1'}, {'5', '2'}, {'5', '3'}, {'5', '4'}, {'5', '5'}, {'5', '6'}, {'5', '7'}, {'5', '8'}, {'5', '9'},
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{'6', '0'}, {'6', '1'}, {'6', '2'}, {'6', '3'}, {'6', '4'}, {'6', '5'}, {'6', '6'}, {'6', '7'}, {'6', '8'}, {'6', '9'},
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{'7', '0'}, {'7', '1'}, {'7', '2'}, {'7', '3'}, {'7', '4'}, {'7', '5'}, {'7', '6'}, {'7', '7'}, {'7', '8'}, {'7', '9'},
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{'8', '0'}, {'8', '1'}, {'8', '2'}, {'8', '3'}, {'8', '4'}, {'8', '5'}, {'8', '6'}, {'8', '7'}, {'8', '8'}, {'8', '9'},
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{'9', '0'}, {'9', '1'}, {'9', '2'}, {'9', '3'}, {'9', '4'}, {'9', '5'}, {'9', '6'}, {'9', '7'}, {'9', '8'}, {'9', '9'},
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}
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};
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// special case for "0"
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if (x == 0)
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{
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@ -549,28 +599,58 @@ class serializer
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return;
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}
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const bool is_negative = std::is_same<NumberType, number_integer_t>::value and not (x >= 0); // see issue #755
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std::size_t i = 0;
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// use a pointer to fill the buffer
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auto buffer_ptr = begin(number_buffer);
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while (x != 0)
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{
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// spare 1 byte for '\0'
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assert(i < number_buffer.size() - 1);
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const bool is_negative = std::is_same<NumberType, number_integer_t>::value and not(x >= 0); // see issue #755
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number_unsigned_t abs_value;
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const auto digit = std::labs(static_cast<long>(x % 10));
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number_buffer[i++] = static_cast<char>('0' + digit);
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x /= 10;
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}
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unsigned int n_chars;
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if (is_negative)
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{
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// make sure there is capacity for the '-'
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assert(i < number_buffer.size() - 2);
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number_buffer[i++] = '-';
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*buffer_ptr = '-';
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abs_value = static_cast<number_unsigned_t>(0 - x);
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// account one more byte for the minus sign
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n_chars = 1 + count_digits(abs_value);
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}
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else
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{
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abs_value = static_cast<number_unsigned_t>(x);
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n_chars = count_digits(abs_value);
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}
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std::reverse(number_buffer.begin(), number_buffer.begin() + i);
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o->write_characters(number_buffer.data(), i);
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// spare 1 byte for '\0'
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assert(n_chars < number_buffer.size() - 1);
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// jump to the end to generate the string from backward
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// so we later avoid reversing the result
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buffer_ptr += n_chars;
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// Fast int2ascii implementation inspired by "Fastware" talk by Andrei Alexandrescu
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// See: https://www.youtube.com/watch?v=o4-CwDo2zpg
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const auto buffer_end = buffer_ptr;
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while (abs_value >= 100)
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{
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const auto digits_index = static_cast<unsigned>((abs_value % 100));
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abs_value /= 100;
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*(--buffer_ptr) = digits_to_99[digits_index][1];
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*(--buffer_ptr) = digits_to_99[digits_index][0];
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}
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if (abs_value >= 10)
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{
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const auto digits_index = static_cast<unsigned>(abs_value);
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*(--buffer_ptr) = digits_to_99[digits_index][1];
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*(--buffer_ptr) = digits_to_99[digits_index][0];
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}
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else
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{
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*(--buffer_ptr) = static_cast<char>('0' + abs_value);
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}
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o->write_characters(number_buffer.data(), n_chars);
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}
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/*!
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@ -11410,6 +11410,40 @@ class serializer
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}
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}
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/*!
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@brief count digits
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Count the number of decimal (base 10) digits for an input unsigned integer.
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@param[in] x unsigned integer number to count its digits
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@return number of decimal digits
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*/
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inline unsigned int count_digits(number_unsigned_t x) noexcept
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{
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unsigned int n_digits = 1;
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for (;;)
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{
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if (x < 10)
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{
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return n_digits;
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}
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if (x < 100)
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{
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return n_digits + 1;
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}
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if (x < 1000)
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{
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return n_digits + 2;
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}
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if (x < 10000)
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{
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return n_digits + 3;
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}
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x = x / 10000u;
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n_digits += 4;
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}
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}
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/*!
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@brief dump an integer
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@ -11425,6 +11459,22 @@ class serializer
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int> = 0>
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void dump_integer(NumberType x)
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{
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static constexpr std::array<std::array<char, 2>, 100> digits_to_99
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{
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{
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{'0', '0'}, {'0', '1'}, {'0', '2'}, {'0', '3'}, {'0', '4'}, {'0', '5'}, {'0', '6'}, {'0', '7'}, {'0', '8'}, {'0', '9'},
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{'1', '0'}, {'1', '1'}, {'1', '2'}, {'1', '3'}, {'1', '4'}, {'1', '5'}, {'1', '6'}, {'1', '7'}, {'1', '8'}, {'1', '9'},
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{'2', '0'}, {'2', '1'}, {'2', '2'}, {'2', '3'}, {'2', '4'}, {'2', '5'}, {'2', '6'}, {'2', '7'}, {'2', '8'}, {'2', '9'},
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{'3', '0'}, {'3', '1'}, {'3', '2'}, {'3', '3'}, {'3', '4'}, {'3', '5'}, {'3', '6'}, {'3', '7'}, {'3', '8'}, {'3', '9'},
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{'4', '0'}, {'4', '1'}, {'4', '2'}, {'4', '3'}, {'4', '4'}, {'4', '5'}, {'4', '6'}, {'4', '7'}, {'4', '8'}, {'4', '9'},
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{'5', '0'}, {'5', '1'}, {'5', '2'}, {'5', '3'}, {'5', '4'}, {'5', '5'}, {'5', '6'}, {'5', '7'}, {'5', '8'}, {'5', '9'},
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{'6', '0'}, {'6', '1'}, {'6', '2'}, {'6', '3'}, {'6', '4'}, {'6', '5'}, {'6', '6'}, {'6', '7'}, {'6', '8'}, {'6', '9'},
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{'7', '0'}, {'7', '1'}, {'7', '2'}, {'7', '3'}, {'7', '4'}, {'7', '5'}, {'7', '6'}, {'7', '7'}, {'7', '8'}, {'7', '9'},
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{'8', '0'}, {'8', '1'}, {'8', '2'}, {'8', '3'}, {'8', '4'}, {'8', '5'}, {'8', '6'}, {'8', '7'}, {'8', '8'}, {'8', '9'},
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{'9', '0'}, {'9', '1'}, {'9', '2'}, {'9', '3'}, {'9', '4'}, {'9', '5'}, {'9', '6'}, {'9', '7'}, {'9', '8'}, {'9', '9'},
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}
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};
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// special case for "0"
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if (x == 0)
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{
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@ -11432,28 +11482,58 @@ class serializer
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return;
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}
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const bool is_negative = std::is_same<NumberType, number_integer_t>::value and not (x >= 0); // see issue #755
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std::size_t i = 0;
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// use a pointer to fill the buffer
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auto buffer_ptr = begin(number_buffer);
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while (x != 0)
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{
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// spare 1 byte for '\0'
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assert(i < number_buffer.size() - 1);
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const bool is_negative = std::is_same<NumberType, number_integer_t>::value and not(x >= 0); // see issue #755
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number_unsigned_t abs_value;
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const auto digit = std::labs(static_cast<long>(x % 10));
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number_buffer[i++] = static_cast<char>('0' + digit);
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x /= 10;
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}
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unsigned int n_chars;
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if (is_negative)
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{
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// make sure there is capacity for the '-'
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assert(i < number_buffer.size() - 2);
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number_buffer[i++] = '-';
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*buffer_ptr = '-';
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abs_value = static_cast<number_unsigned_t>(0 - x);
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// account one more byte for the minus sign
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n_chars = 1 + count_digits(abs_value);
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}
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else
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{
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abs_value = static_cast<number_unsigned_t>(x);
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n_chars = count_digits(abs_value);
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}
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std::reverse(number_buffer.begin(), number_buffer.begin() + i);
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o->write_characters(number_buffer.data(), i);
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// spare 1 byte for '\0'
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assert(n_chars < number_buffer.size() - 1);
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// jump to the end to generate the string from backward
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// so we later avoid reversing the result
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buffer_ptr += n_chars;
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// Fast int2ascii implementation inspired by "Fastware" talk by Andrei Alexandrescu
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// See: https://www.youtube.com/watch?v=o4-CwDo2zpg
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const auto buffer_end = buffer_ptr;
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while (abs_value >= 100)
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{
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const auto digits_index = static_cast<unsigned>((abs_value % 100));
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abs_value /= 100;
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*(--buffer_ptr) = digits_to_99[digits_index][1];
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*(--buffer_ptr) = digits_to_99[digits_index][0];
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}
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if (abs_value >= 10)
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{
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const auto digits_index = static_cast<unsigned>(abs_value);
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*(--buffer_ptr) = digits_to_99[digits_index][1];
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*(--buffer_ptr) = digits_to_99[digits_index][0];
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}
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else
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{
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*(--buffer_ptr) = static_cast<char>('0' + abs_value);
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}
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o->write_characters(number_buffer.data(), n_chars);
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}
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/*!
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