Make dragonbox::to_decimal available in format.h
This commit is contained in:
Victor Zverovich
parent
2213a7110c
commit
63e0c35412
@ -1776,67 +1776,6 @@ inline int floor_log10_pow2_minus_log10_4_over_3(int e) FMT_NOEXCEPT {
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shift_amount;
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}
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// Type-specific information that Dragonbox uses.
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template <class T> struct float_info;
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template <> struct float_info<float> {
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using carrier_uint = uint32_t;
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static const int significand_bits = 23;
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static const int exponent_bits = 8;
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static const int min_exponent = -126;
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static const int max_exponent = 127;
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static const int exponent_bias = -127;
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static const int decimal_digits = 9;
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static const int kappa = 1;
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static const int big_divisor = 100;
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static const int small_divisor = 10;
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static const int min_k = -31;
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static const int max_k = 46;
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static const int cache_bits = 64;
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static const int divisibility_check_by_5_threshold = 39;
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static const int case_fc_pm_half_lower_threshold = -1;
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static const int case_fc_pm_half_upper_threshold = 6;
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static const int case_fc_lower_threshold = -2;
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static const int case_fc_upper_threshold = 6;
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static const int case_shorter_interval_left_endpoint_lower_threshold = 2;
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static const int case_shorter_interval_left_endpoint_upper_threshold = 3;
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static const int shorter_interval_tie_lower_threshold = -35;
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static const int shorter_interval_tie_upper_threshold = -35;
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static const int max_trailing_zeros = 7;
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};
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template <> struct float_info<double> {
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using carrier_uint = uint64_t;
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static const int significand_bits = 52;
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static const int exponent_bits = 11;
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static const int min_exponent = -1022;
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static const int max_exponent = 1023;
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static const int exponent_bias = -1023;
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static const int decimal_digits = 17;
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static const int kappa = 2;
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static const int big_divisor = 1000;
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static const int small_divisor = 100;
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static const int min_k = -292;
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static const int max_k = 326;
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static const int cache_bits = 128;
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static const int divisibility_check_by_5_threshold = 86;
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static const int case_fc_pm_half_lower_threshold = -2;
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static const int case_fc_pm_half_upper_threshold = 9;
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static const int case_fc_lower_threshold = -4;
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static const int case_fc_upper_threshold = 9;
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static const int case_shorter_interval_left_endpoint_lower_threshold = 2;
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static const int case_shorter_interval_left_endpoint_upper_threshold = 3;
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static const int shorter_interval_tie_lower_threshold = -77;
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static const int shorter_interval_tie_upper_threshold = -77;
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static const int max_trailing_zeros = 16;
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};
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template <class T> struct decimal_fp {
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using significand_type = typename float_info<T>::carrier_uint;
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significand_type significand;
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int exponent;
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};
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// Returns true iff x is divisible by pow(2, exp).
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inline bool divisible_by_power_of_2(uint32_t x, int exp) FMT_NOEXCEPT {
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FMT_ASSERT(exp >= 1, "");
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@ -2291,7 +2230,9 @@ FMT_ALWAYS_INLINE FMT_SAFEBUFFERS decimal_fp<T> shorter_interval_case(
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return ret_value;
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}
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template <class T> FMT_SAFEBUFFERS decimal_fp<T> to_decimal(T x) FMT_NOEXCEPT {
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template <typename T>
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FMT_SAFEBUFFERS enable_if_t<is_fast_float<T>(), decimal_fp<T>> to_decimal(T x)
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FMT_NOEXCEPT {
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// Step 1: integer promotion & Schubfach multiplier calculation.
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using carrier_uint = typename float_info<T>::carrier_uint;
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@ -587,13 +587,8 @@ inline counting_iterator copy_str(InputIt begin, InputIt end,
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return it + (end - begin);
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}
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#ifndef FMT_USE_GRISU
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# define FMT_USE_GRISU 1
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#endif
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template <typename T> constexpr bool use_grisu() {
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return FMT_USE_GRISU && std::numeric_limits<double>::is_iec559 &&
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sizeof(T) <= sizeof(double);
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template <typename T> constexpr bool is_fast_float() {
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return std::numeric_limits<T>::is_iec559 && sizeof(T) <= sizeof(double);
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}
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#ifndef FMT_USE_FULL_CACHE_DRAGONBOX
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@ -1368,6 +1363,78 @@ int snprintf_float(T value, int precision, float_specs specs,
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template <typename T> T promote_float(T value) { return value; }
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inline double promote_float(float value) { return static_cast<double>(value); }
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namespace dragonbox {
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// Type-specific information that Dragonbox uses.
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template <class T> struct float_info;
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template <> struct float_info<float> {
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using carrier_uint = uint32_t;
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static const int significand_bits = 23;
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static const int exponent_bits = 8;
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static const int min_exponent = -126;
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static const int max_exponent = 127;
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static const int exponent_bias = -127;
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static const int decimal_digits = 9;
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static const int kappa = 1;
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static const int big_divisor = 100;
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static const int small_divisor = 10;
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static const int min_k = -31;
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static const int max_k = 46;
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static const int cache_bits = 64;
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static const int divisibility_check_by_5_threshold = 39;
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static const int case_fc_pm_half_lower_threshold = -1;
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static const int case_fc_pm_half_upper_threshold = 6;
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static const int case_fc_lower_threshold = -2;
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static const int case_fc_upper_threshold = 6;
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static const int case_shorter_interval_left_endpoint_lower_threshold = 2;
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static const int case_shorter_interval_left_endpoint_upper_threshold = 3;
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static const int shorter_interval_tie_lower_threshold = -35;
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static const int shorter_interval_tie_upper_threshold = -35;
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static const int max_trailing_zeros = 7;
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};
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template <> struct float_info<double> {
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using carrier_uint = uint64_t;
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static const int significand_bits = 52;
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static const int exponent_bits = 11;
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static const int min_exponent = -1022;
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static const int max_exponent = 1023;
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static const int exponent_bias = -1023;
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static const int decimal_digits = 17;
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static const int kappa = 2;
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static const int big_divisor = 1000;
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static const int small_divisor = 100;
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static const int min_k = -292;
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static const int max_k = 326;
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static const int cache_bits = 128;
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static const int divisibility_check_by_5_threshold = 86;
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static const int case_fc_pm_half_lower_threshold = -2;
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static const int case_fc_pm_half_upper_threshold = 9;
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static const int case_fc_lower_threshold = -4;
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static const int case_fc_upper_threshold = 9;
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static const int case_shorter_interval_left_endpoint_lower_threshold = 2;
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static const int case_shorter_interval_left_endpoint_upper_threshold = 3;
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static const int shorter_interval_tie_lower_threshold = -77;
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static const int shorter_interval_tie_upper_threshold = -77;
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static const int max_trailing_zeros = 16;
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};
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template <typename T> struct decimal_fp {
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using significand_type = typename float_info<T>::carrier_uint;
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significand_type significand;
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int exponent;
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};
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template <typename T>
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enable_if_t<is_fast_float<T>(), decimal_fp<T>> to_decimal(T x) FMT_NOEXCEPT;
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template <typename T>
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inline enable_if_t<!is_fast_float<T>(), unformattable> to_decimal(T) {
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return {};
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}
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} // namespace dragonbox
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template <typename Handler>
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FMT_CONSTEXPR void handle_int_type_spec(char spec, Handler&& handler) {
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switch (spec) {
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@ -1810,7 +1877,7 @@ OutputIt write(OutputIt out, T value, basic_format_specs<Char> specs,
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++precision;
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}
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if (const_check(std::is_same<T, float>())) fspecs.binary32 = true;
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fspecs.use_grisu = use_grisu<T>();
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fspecs.use_grisu = is_fast_float<T>();
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int exp = format_float(promote_float(value), precision, fspecs, buffer);
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fspecs.precision = precision;
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Char point =
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@ -1837,7 +1904,7 @@ OutputIt write(OutputIt out, T value) {
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memory_buffer buffer;
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int precision = -1;
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if (const_check(std::is_same<T, float>())) fspecs.binary32 = true;
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fspecs.use_grisu = use_grisu<T>();
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fspecs.use_grisu = is_fast_float<T>();
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int exp = format_float(promote_float(value), precision, fspecs, buffer);
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fspecs.precision = precision;
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float_writer<Char> w(buffer.data(), static_cast<int>(buffer.size()), exp,
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