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suyu/externals/vcpkg/packages/fmt_x64-windows/include/fmt/format-inl.h
Crimson-Hawk f1e4595ebf Initial commit
2024-03-05 16:42:40 +08:00

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// Formatting library for C++ - implementation
//
// Copyright (c) 2012 - 2016, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
#ifndef FMT_FORMAT_INL_H_
#define FMT_FORMAT_INL_H_
#include <algorithm>
#include <cctype>
#include <cerrno> // errno
#include <climits>
#include <cmath>
#include <cstdarg>
#include <cstring> // std::memmove
#include <cwchar>
#include <exception>
#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
# include <locale>
#endif
#ifdef _WIN32
# include <io.h> // _isatty
#endif
#include "format.h"
FMT_BEGIN_NAMESPACE
namespace detail {
FMT_FUNC void assert_fail(const char* file, int line, const char* message) {
// Use unchecked std::fprintf to avoid triggering another assertion when
// writing to stderr fails
std::fprintf(stderr, "%s:%d: assertion failed: %s", file, line, message);
// Chosen instead of std::abort to satisfy Clang in CUDA mode during device
// code pass.
std::terminate();
}
FMT_FUNC void throw_format_error(const char* message) {
FMT_THROW(format_error(message));
}
#ifndef _MSC_VER
# define FMT_SNPRINTF snprintf
#else // _MSC_VER
inline int fmt_snprintf(char* buffer, size_t size, const char* format, ...) {
va_list args;
va_start(args, format);
int result = vsnprintf_s(buffer, size, _TRUNCATE, format, args);
va_end(args);
return result;
}
# define FMT_SNPRINTF fmt_snprintf
#endif // _MSC_VER
FMT_FUNC void format_error_code(detail::buffer<char>& out, int error_code,
string_view message) FMT_NOEXCEPT {
// Report error code making sure that the output fits into
// inline_buffer_size to avoid dynamic memory allocation and potential
// bad_alloc.
out.try_resize(0);
static const char SEP[] = ": ";
static const char ERROR_STR[] = "error ";
// Subtract 2 to account for terminating null characters in SEP and ERROR_STR.
size_t error_code_size = sizeof(SEP) + sizeof(ERROR_STR) - 2;
auto abs_value = static_cast<uint32_or_64_or_128_t<int>>(error_code);
if (detail::is_negative(error_code)) {
abs_value = 0 - abs_value;
++error_code_size;
}
error_code_size += detail::to_unsigned(detail::count_digits(abs_value));
auto it = buffer_appender<char>(out);
if (message.size() <= inline_buffer_size - error_code_size)
format_to(it, FMT_STRING("{}{}"), message, SEP);
format_to(it, FMT_STRING("{}{}"), ERROR_STR, error_code);
FMT_ASSERT(out.size() <= inline_buffer_size, "");
}
FMT_FUNC void report_error(format_func func, int error_code,
const char* message) FMT_NOEXCEPT {
memory_buffer full_message;
func(full_message, error_code, message);
// Don't use fwrite_fully because the latter may throw.
if (std::fwrite(full_message.data(), full_message.size(), 1, stderr) > 0)
std::fputc('\n', stderr);
}
// A wrapper around fwrite that throws on error.
inline void fwrite_fully(const void* ptr, size_t size, size_t count,
FILE* stream) {
size_t written = std::fwrite(ptr, size, count, stream);
if (written < count) FMT_THROW(system_error(errno, "cannot write to file"));
}
#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
template <typename Locale>
locale_ref::locale_ref(const Locale& loc) : locale_(&loc) {
static_assert(std::is_same<Locale, std::locale>::value, "");
}
template <typename Locale> Locale locale_ref::get() const {
static_assert(std::is_same<Locale, std::locale>::value, "");
return locale_ ? *static_cast<const std::locale*>(locale_) : std::locale();
}
template <typename Char>
FMT_FUNC auto thousands_sep_impl(locale_ref loc) -> thousands_sep_result<Char> {
auto& facet = std::use_facet<std::numpunct<Char>>(loc.get<std::locale>());
auto grouping = facet.grouping();
auto thousands_sep = grouping.empty() ? Char() : facet.thousands_sep();
return {std::move(grouping), thousands_sep};
}
template <typename Char> FMT_FUNC Char decimal_point_impl(locale_ref loc) {
return std::use_facet<std::numpunct<Char>>(loc.get<std::locale>())
.decimal_point();
}
#else
template <typename Char>
FMT_FUNC auto thousands_sep_impl(locale_ref) -> thousands_sep_result<Char> {
return {"\03", FMT_STATIC_THOUSANDS_SEPARATOR};
}
template <typename Char> FMT_FUNC Char decimal_point_impl(locale_ref) {
return '.';
}
#endif
} // namespace detail
#if !FMT_MSC_VER
FMT_API FMT_FUNC format_error::~format_error() FMT_NOEXCEPT = default;
#endif
FMT_FUNC std::system_error vsystem_error(int error_code, string_view format_str,
format_args args) {
auto ec = std::error_code(error_code, std::generic_category());
return std::system_error(ec, vformat(format_str, args));
}
namespace detail {
template <> FMT_FUNC int count_digits<4>(detail::fallback_uintptr n) {
// fallback_uintptr is always stored in little endian.
int i = static_cast<int>(sizeof(void*)) - 1;
while (i > 0 && n.value[i] == 0) --i;
auto char_digits = std::numeric_limits<unsigned char>::digits / 4;
return i >= 0 ? i * char_digits + count_digits<4, unsigned>(n.value[i]) : 1;
}
// log10(2) = 0x0.4d104d427de7fbcc...
static constexpr uint64_t log10_2_significand = 0x4d104d427de7fbcc;
template <typename T = void> struct basic_impl_data {
// Normalized 64-bit significands of pow(10, k), for k = -348, -340, ..., 340.
// These are generated by support/compute-powers.py.
static constexpr uint64_t pow10_significands[87] = {
0xfa8fd5a0081c0288, 0xbaaee17fa23ebf76, 0x8b16fb203055ac76,
0xcf42894a5dce35ea, 0x9a6bb0aa55653b2d, 0xe61acf033d1a45df,
0xab70fe17c79ac6ca, 0xff77b1fcbebcdc4f, 0xbe5691ef416bd60c,
0x8dd01fad907ffc3c, 0xd3515c2831559a83, 0x9d71ac8fada6c9b5,
0xea9c227723ee8bcb, 0xaecc49914078536d, 0x823c12795db6ce57,
0xc21094364dfb5637, 0x9096ea6f3848984f, 0xd77485cb25823ac7,
0xa086cfcd97bf97f4, 0xef340a98172aace5, 0xb23867fb2a35b28e,
0x84c8d4dfd2c63f3b, 0xc5dd44271ad3cdba, 0x936b9fcebb25c996,
0xdbac6c247d62a584, 0xa3ab66580d5fdaf6, 0xf3e2f893dec3f126,
0xb5b5ada8aaff80b8, 0x87625f056c7c4a8b, 0xc9bcff6034c13053,
0x964e858c91ba2655, 0xdff9772470297ebd, 0xa6dfbd9fb8e5b88f,
0xf8a95fcf88747d94, 0xb94470938fa89bcf, 0x8a08f0f8bf0f156b,
0xcdb02555653131b6, 0x993fe2c6d07b7fac, 0xe45c10c42a2b3b06,
0xaa242499697392d3, 0xfd87b5f28300ca0e, 0xbce5086492111aeb,
0x8cbccc096f5088cc, 0xd1b71758e219652c, 0x9c40000000000000,
0xe8d4a51000000000, 0xad78ebc5ac620000, 0x813f3978f8940984,
0xc097ce7bc90715b3, 0x8f7e32ce7bea5c70, 0xd5d238a4abe98068,
0x9f4f2726179a2245, 0xed63a231d4c4fb27, 0xb0de65388cc8ada8,
0x83c7088e1aab65db, 0xc45d1df942711d9a, 0x924d692ca61be758,
0xda01ee641a708dea, 0xa26da3999aef774a, 0xf209787bb47d6b85,
0xb454e4a179dd1877, 0x865b86925b9bc5c2, 0xc83553c5c8965d3d,
0x952ab45cfa97a0b3, 0xde469fbd99a05fe3, 0xa59bc234db398c25,
0xf6c69a72a3989f5c, 0xb7dcbf5354e9bece, 0x88fcf317f22241e2,
0xcc20ce9bd35c78a5, 0x98165af37b2153df, 0xe2a0b5dc971f303a,
0xa8d9d1535ce3b396, 0xfb9b7cd9a4a7443c, 0xbb764c4ca7a44410,
0x8bab8eefb6409c1a, 0xd01fef10a657842c, 0x9b10a4e5e9913129,
0xe7109bfba19c0c9d, 0xac2820d9623bf429, 0x80444b5e7aa7cf85,
0xbf21e44003acdd2d, 0x8e679c2f5e44ff8f, 0xd433179d9c8cb841,
0x9e19db92b4e31ba9, 0xeb96bf6ebadf77d9, 0xaf87023b9bf0ee6b,
};
#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wnarrowing"
#endif
// Binary exponents of pow(10, k), for k = -348, -340, ..., 340, corresponding
// to significands above.
static constexpr int16_t pow10_exponents[87] = {
-1220, -1193, -1166, -1140, -1113, -1087, -1060, -1034, -1007, -980, -954,
-927, -901, -874, -847, -821, -794, -768, -741, -715, -688, -661,
-635, -608, -582, -555, -529, -502, -475, -449, -422, -396, -369,
-343, -316, -289, -263, -236, -210, -183, -157, -130, -103, -77,
-50, -24, 3, 30, 56, 83, 109, 136, 162, 189, 216,
242, 269, 295, 322, 348, 375, 402, 428, 455, 481, 508,
534, 561, 588, 614, 641, 667, 694, 720, 747, 774, 800,
827, 853, 880, 907, 933, 960, 986, 1013, 1039, 1066};
#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
# pragma GCC diagnostic pop
#endif
static constexpr uint64_t power_of_10_64[20] = {
1, FMT_POWERS_OF_10(1ULL), FMT_POWERS_OF_10(1000000000ULL),
10000000000000000000ULL};
};
// This is a struct rather than an alias to avoid shadowing warnings in gcc.
struct impl_data : basic_impl_data<> {};
#if __cplusplus < 201703L
template <typename T>
constexpr uint64_t basic_impl_data<T>::pow10_significands[];
template <typename T> constexpr int16_t basic_impl_data<T>::pow10_exponents[];
template <typename T> constexpr uint64_t basic_impl_data<T>::power_of_10_64[];
#endif
template <typename T> struct bits {
static FMT_CONSTEXPR_DECL const int value =
static_cast<int>(sizeof(T) * std::numeric_limits<unsigned char>::digits);
};
// Returns the number of significand bits in Float excluding the implicit bit.
template <typename Float> constexpr int num_significand_bits() {
// Subtract 1 to account for an implicit most significant bit in the
// normalized form.
return std::numeric_limits<Float>::digits - 1;
}
// A floating-point number f * pow(2, e).
struct fp {
uint64_t f;
int e;
static constexpr const int num_significand_bits = bits<decltype(f)>::value;
constexpr fp() : f(0), e(0) {}
constexpr fp(uint64_t f_val, int e_val) : f(f_val), e(e_val) {}
// Constructs fp from an IEEE754 floating-point number. It is a template to
// prevent compile errors on systems where n is not IEEE754.
template <typename Float> explicit FMT_CONSTEXPR fp(Float n) { assign(n); }
template <typename Float>
using is_supported = bool_constant<sizeof(Float) == sizeof(uint64_t) ||
sizeof(Float) == sizeof(uint32_t)>;
// Assigns d to this and return true iff predecessor is closer than successor.
template <typename Float, FMT_ENABLE_IF(is_supported<Float>::value)>
FMT_CONSTEXPR bool assign(Float n) {
// Assume float is in the format [sign][exponent][significand].
const int num_float_significand_bits =
detail::num_significand_bits<Float>();
const uint64_t implicit_bit = 1ULL << num_float_significand_bits;
const uint64_t significand_mask = implicit_bit - 1;
constexpr bool is_double = sizeof(Float) == sizeof(uint64_t);
auto u = bit_cast<conditional_t<is_double, uint64_t, uint32_t>>(n);
f = u & significand_mask;
const uint64_t exponent_mask = (~0ULL >> 1) & ~significand_mask;
int biased_e =
static_cast<int>((u & exponent_mask) >> num_float_significand_bits);
// The predecessor is closer if n is a normalized power of 2 (f == 0) other
// than the smallest normalized number (biased_e > 1).
bool is_predecessor_closer = f == 0 && biased_e > 1;
if (biased_e != 0)
f += implicit_bit;
else
biased_e = 1; // Subnormals use biased exponent 1 (min exponent).
const int exponent_bias = std::numeric_limits<Float>::max_exponent - 1;
e = biased_e - exponent_bias - num_float_significand_bits;
return is_predecessor_closer;
}
template <typename Float, FMT_ENABLE_IF(!is_supported<Float>::value)>
bool assign(Float) {
FMT_ASSERT(false, "");
return false;
}
};
// Normalizes the value converted from double and multiplied by (1 << SHIFT).
template <int SHIFT = 0> FMT_CONSTEXPR fp normalize(fp value) {
// Handle subnormals.
const uint64_t implicit_bit = 1ULL << num_significand_bits<double>();
const auto shifted_implicit_bit = implicit_bit << SHIFT;
while ((value.f & shifted_implicit_bit) == 0) {
value.f <<= 1;
--value.e;
}
// Subtract 1 to account for hidden bit.
const auto offset =
fp::num_significand_bits - num_significand_bits<double>() - SHIFT - 1;
value.f <<= offset;
value.e -= offset;
return value;
}
inline bool operator==(fp x, fp y) { return x.f == y.f && x.e == y.e; }
// Computes lhs * rhs / pow(2, 64) rounded to nearest with half-up tie breaking.
FMT_CONSTEXPR inline uint64_t multiply(uint64_t lhs, uint64_t rhs) {
#if FMT_USE_INT128
auto product = static_cast<__uint128_t>(lhs) * rhs;
auto f = static_cast<uint64_t>(product >> 64);
return (static_cast<uint64_t>(product) & (1ULL << 63)) != 0 ? f + 1 : f;
#else
// Multiply 32-bit parts of significands.
uint64_t mask = (1ULL << 32) - 1;
uint64_t a = lhs >> 32, b = lhs & mask;
uint64_t c = rhs >> 32, d = rhs & mask;
uint64_t ac = a * c, bc = b * c, ad = a * d, bd = b * d;
// Compute mid 64-bit of result and round.
uint64_t mid = (bd >> 32) + (ad & mask) + (bc & mask) + (1U << 31);
return ac + (ad >> 32) + (bc >> 32) + (mid >> 32);
#endif
}
FMT_CONSTEXPR inline fp operator*(fp x, fp y) {
return {multiply(x.f, y.f), x.e + y.e + 64};
}
// Returns a cached power of 10 `c_k = c_k.f * pow(2, c_k.e)` such that its
// (binary) exponent satisfies `min_exponent <= c_k.e <= min_exponent + 28`.
FMT_CONSTEXPR inline fp get_cached_power(int min_exponent,
int& pow10_exponent) {
const int shift = 32;
const auto significand = static_cast<int64_t>(log10_2_significand);
int index = static_cast<int>(
((min_exponent + fp::num_significand_bits - 1) * (significand >> shift) +
((int64_t(1) << shift) - 1)) // ceil
>> 32 // arithmetic shift
);
// Decimal exponent of the first (smallest) cached power of 10.
const int first_dec_exp = -348;
// Difference between 2 consecutive decimal exponents in cached powers of 10.
const int dec_exp_step = 8;
index = (index - first_dec_exp - 1) / dec_exp_step + 1;
pow10_exponent = first_dec_exp + index * dec_exp_step;
return {impl_data::pow10_significands[index],
impl_data::pow10_exponents[index]};
}
// A simple accumulator to hold the sums of terms in bigint::square if uint128_t
// is not available.
struct accumulator {
uint64_t lower;
uint64_t upper;
constexpr accumulator() : lower(0), upper(0) {}
constexpr explicit operator uint32_t() const {
return static_cast<uint32_t>(lower);
}
FMT_CONSTEXPR void operator+=(uint64_t n) {
lower += n;
if (lower < n) ++upper;
}
FMT_CONSTEXPR void operator>>=(int shift) {
FMT_ASSERT(shift == 32, "");
(void)shift;
lower = (upper << 32) | (lower >> 32);
upper >>= 32;
}
};
class bigint {
private:
// A bigint is stored as an array of bigits (big digits), with bigit at index
// 0 being the least significant one.
using bigit = uint32_t;
using double_bigit = uint64_t;
enum { bigits_capacity = 32 };
basic_memory_buffer<bigit, bigits_capacity> bigits_;
int exp_;
FMT_CONSTEXPR20 bigit operator[](int index) const {
return bigits_[to_unsigned(index)];
}
FMT_CONSTEXPR20 bigit& operator[](int index) {
return bigits_[to_unsigned(index)];
}
static FMT_CONSTEXPR_DECL const int bigit_bits = bits<bigit>::value;
friend struct formatter<bigint>;
FMT_CONSTEXPR20 void subtract_bigits(int index, bigit other, bigit& borrow) {
auto result = static_cast<double_bigit>((*this)[index]) - other - borrow;
(*this)[index] = static_cast<bigit>(result);
borrow = static_cast<bigit>(result >> (bigit_bits * 2 - 1));
}
FMT_CONSTEXPR20 void remove_leading_zeros() {
int num_bigits = static_cast<int>(bigits_.size()) - 1;
while (num_bigits > 0 && (*this)[num_bigits] == 0) --num_bigits;
bigits_.resize(to_unsigned(num_bigits + 1));
}
// Computes *this -= other assuming aligned bigints and *this >= other.
FMT_CONSTEXPR20 void subtract_aligned(const bigint& other) {
FMT_ASSERT(other.exp_ >= exp_, "unaligned bigints");
FMT_ASSERT(compare(*this, other) >= 0, "");
bigit borrow = 0;
int i = other.exp_ - exp_;
for (size_t j = 0, n = other.bigits_.size(); j != n; ++i, ++j)
subtract_bigits(i, other.bigits_[j], borrow);
while (borrow > 0) subtract_bigits(i, 0, borrow);
remove_leading_zeros();
}
FMT_CONSTEXPR20 void multiply(uint32_t value) {
const double_bigit wide_value = value;
bigit carry = 0;
for (size_t i = 0, n = bigits_.size(); i < n; ++i) {
double_bigit result = bigits_[i] * wide_value + carry;
bigits_[i] = static_cast<bigit>(result);
carry = static_cast<bigit>(result >> bigit_bits);
}
if (carry != 0) bigits_.push_back(carry);
}
FMT_CONSTEXPR20 void multiply(uint64_t value) {
const bigit mask = ~bigit(0);
const double_bigit lower = value & mask;
const double_bigit upper = value >> bigit_bits;
double_bigit carry = 0;
for (size_t i = 0, n = bigits_.size(); i < n; ++i) {
double_bigit result = bigits_[i] * lower + (carry & mask);
carry =
bigits_[i] * upper + (result >> bigit_bits) + (carry >> bigit_bits);
bigits_[i] = static_cast<bigit>(result);
}
while (carry != 0) {
bigits_.push_back(carry & mask);
carry >>= bigit_bits;
}
}
public:
FMT_CONSTEXPR20 bigint() : exp_(0) {}
explicit bigint(uint64_t n) { assign(n); }
FMT_CONSTEXPR20 ~bigint() {
FMT_ASSERT(bigits_.capacity() <= bigits_capacity, "");
}
bigint(const bigint&) = delete;
void operator=(const bigint&) = delete;
FMT_CONSTEXPR20 void assign(const bigint& other) {
auto size = other.bigits_.size();
bigits_.resize(size);
auto data = other.bigits_.data();
std::copy(data, data + size, make_checked(bigits_.data(), size));
exp_ = other.exp_;
}
FMT_CONSTEXPR20 void assign(uint64_t n) {
size_t num_bigits = 0;
do {
bigits_[num_bigits++] = n & ~bigit(0);
n >>= bigit_bits;
} while (n != 0);
bigits_.resize(num_bigits);
exp_ = 0;
}
FMT_CONSTEXPR20 int num_bigits() const {
return static_cast<int>(bigits_.size()) + exp_;
}
FMT_NOINLINE FMT_CONSTEXPR20 bigint& operator<<=(int shift) {
FMT_ASSERT(shift >= 0, "");
exp_ += shift / bigit_bits;
shift %= bigit_bits;
if (shift == 0) return *this;
bigit carry = 0;
for (size_t i = 0, n = bigits_.size(); i < n; ++i) {
bigit c = bigits_[i] >> (bigit_bits - shift);
bigits_[i] = (bigits_[i] << shift) + carry;
carry = c;
}
if (carry != 0) bigits_.push_back(carry);
return *this;
}
template <typename Int> FMT_CONSTEXPR20 bigint& operator*=(Int value) {
FMT_ASSERT(value > 0, "");
multiply(uint32_or_64_or_128_t<Int>(value));
return *this;
}
friend FMT_CONSTEXPR20 int compare(const bigint& lhs, const bigint& rhs) {
int num_lhs_bigits = lhs.num_bigits(), num_rhs_bigits = rhs.num_bigits();
if (num_lhs_bigits != num_rhs_bigits)
return num_lhs_bigits > num_rhs_bigits ? 1 : -1;
int i = static_cast<int>(lhs.bigits_.size()) - 1;
int j = static_cast<int>(rhs.bigits_.size()) - 1;
int end = i - j;
if (end < 0) end = 0;
for (; i >= end; --i, --j) {
bigit lhs_bigit = lhs[i], rhs_bigit = rhs[j];
if (lhs_bigit != rhs_bigit) return lhs_bigit > rhs_bigit ? 1 : -1;
}
if (i != j) return i > j ? 1 : -1;
return 0;
}
// Returns compare(lhs1 + lhs2, rhs).
friend FMT_CONSTEXPR20 int add_compare(const bigint& lhs1, const bigint& lhs2,
const bigint& rhs) {
int max_lhs_bigits = (std::max)(lhs1.num_bigits(), lhs2.num_bigits());
int num_rhs_bigits = rhs.num_bigits();
if (max_lhs_bigits + 1 < num_rhs_bigits) return -1;
if (max_lhs_bigits > num_rhs_bigits) return 1;
auto get_bigit = [](const bigint& n, int i) -> bigit {
return i >= n.exp_ && i < n.num_bigits() ? n[i - n.exp_] : 0;
};
double_bigit borrow = 0;
int min_exp = (std::min)((std::min)(lhs1.exp_, lhs2.exp_), rhs.exp_);
for (int i = num_rhs_bigits - 1; i >= min_exp; --i) {
double_bigit sum =
static_cast<double_bigit>(get_bigit(lhs1, i)) + get_bigit(lhs2, i);
bigit rhs_bigit = get_bigit(rhs, i);
if (sum > rhs_bigit + borrow) return 1;
borrow = rhs_bigit + borrow - sum;
if (borrow > 1) return -1;
borrow <<= bigit_bits;
}
return borrow != 0 ? -1 : 0;
}
// Assigns pow(10, exp) to this bigint.
FMT_CONSTEXPR20 void assign_pow10(int exp) {
FMT_ASSERT(exp >= 0, "");
if (exp == 0) return assign(1);
// Find the top bit.
int bitmask = 1;
while (exp >= bitmask) bitmask <<= 1;
bitmask >>= 1;
// pow(10, exp) = pow(5, exp) * pow(2, exp). First compute pow(5, exp) by
// repeated squaring and multiplication.
assign(5);
bitmask >>= 1;
while (bitmask != 0) {
square();
if ((exp & bitmask) != 0) *this *= 5;
bitmask >>= 1;
}
*this <<= exp; // Multiply by pow(2, exp) by shifting.
}
FMT_CONSTEXPR20 void square() {
int num_bigits = static_cast<int>(bigits_.size());
int num_result_bigits = 2 * num_bigits;
basic_memory_buffer<bigit, bigits_capacity> n(std::move(bigits_));
bigits_.resize(to_unsigned(num_result_bigits));
using accumulator_t = conditional_t<FMT_USE_INT128, uint128_t, accumulator>;
auto sum = accumulator_t();
for (int bigit_index = 0; bigit_index < num_bigits; ++bigit_index) {
// Compute bigit at position bigit_index of the result by adding
// cross-product terms n[i] * n[j] such that i + j == bigit_index.
for (int i = 0, j = bigit_index; j >= 0; ++i, --j) {
// Most terms are multiplied twice which can be optimized in the future.
sum += static_cast<double_bigit>(n[i]) * n[j];
}
(*this)[bigit_index] = static_cast<bigit>(sum);
sum >>= bits<bigit>::value; // Compute the carry.
}
// Do the same for the top half.
for (int bigit_index = num_bigits; bigit_index < num_result_bigits;
++bigit_index) {
for (int j = num_bigits - 1, i = bigit_index - j; i < num_bigits;)
sum += static_cast<double_bigit>(n[i++]) * n[j--];
(*this)[bigit_index] = static_cast<bigit>(sum);
sum >>= bits<bigit>::value;
}
remove_leading_zeros();
exp_ *= 2;
}
// If this bigint has a bigger exponent than other, adds trailing zero to make
// exponents equal. This simplifies some operations such as subtraction.
FMT_CONSTEXPR20 void align(const bigint& other) {
int exp_difference = exp_ - other.exp_;
if (exp_difference <= 0) return;
int num_bigits = static_cast<int>(bigits_.size());
bigits_.resize(to_unsigned(num_bigits + exp_difference));
for (int i = num_bigits - 1, j = i + exp_difference; i >= 0; --i, --j)
bigits_[j] = bigits_[i];
std::uninitialized_fill_n(bigits_.data(), exp_difference, 0);
exp_ -= exp_difference;
}
// Divides this bignum by divisor, assigning the remainder to this and
// returning the quotient.
FMT_CONSTEXPR20 int divmod_assign(const bigint& divisor) {
FMT_ASSERT(this != &divisor, "");
if (compare(*this, divisor) < 0) return 0;
FMT_ASSERT(divisor.bigits_[divisor.bigits_.size() - 1u] != 0, "");
align(divisor);
int quotient = 0;
do {
subtract_aligned(divisor);
++quotient;
} while (compare(*this, divisor) >= 0);
return quotient;
}
};
enum class round_direction { unknown, up, down };
// Given the divisor (normally a power of 10), the remainder = v % divisor for
// some number v and the error, returns whether v should be rounded up, down, or
// whether the rounding direction can't be determined due to error.
// error should be less than divisor / 2.
FMT_CONSTEXPR inline round_direction get_round_direction(uint64_t divisor,
uint64_t remainder,
uint64_t error) {
FMT_ASSERT(remainder < divisor, ""); // divisor - remainder won't overflow.
FMT_ASSERT(error < divisor, ""); // divisor - error won't overflow.
FMT_ASSERT(error < divisor - error, ""); // error * 2 won't overflow.
// Round down if (remainder + error) * 2 <= divisor.
if (remainder <= divisor - remainder && error * 2 <= divisor - remainder * 2)
return round_direction::down;
// Round up if (remainder - error) * 2 >= divisor.
if (remainder >= error &&
remainder - error >= divisor - (remainder - error)) {
return round_direction::up;
}
return round_direction::unknown;
}
namespace digits {
enum result {
more, // Generate more digits.
done, // Done generating digits.
error // Digit generation cancelled due to an error.
};
}
struct gen_digits_handler {
char* buf;
int size;
int precision;
int exp10;
bool fixed;
FMT_CONSTEXPR digits::result on_digit(char digit, uint64_t divisor,
uint64_t remainder, uint64_t error,
bool integral) {
FMT_ASSERT(remainder < divisor, "");
buf[size++] = digit;
if (!integral && error >= remainder) return digits::error;
if (size < precision) return digits::more;
if (!integral) {
// Check if error * 2 < divisor with overflow prevention.
// The check is not needed for the integral part because error = 1
// and divisor > (1 << 32) there.
if (error >= divisor || error >= divisor - error) return digits::error;
} else {
FMT_ASSERT(error == 1 && divisor > 2, "");
}
auto dir = get_round_direction(divisor, remainder, error);
if (dir != round_direction::up)
return dir == round_direction::down ? digits::done : digits::error;
++buf[size - 1];
for (int i = size - 1; i > 0 && buf[i] > '9'; --i) {
buf[i] = '0';
++buf[i - 1];
}
if (buf[0] > '9') {
buf[0] = '1';
if (fixed)
buf[size++] = '0';
else
++exp10;
}
return digits::done;
}
};
// Generates output using the Grisu digit-gen algorithm.
// error: the size of the region (lower, upper) outside of which numbers
// definitely do not round to value (Delta in Grisu3).
FMT_INLINE FMT_CONSTEXPR20 digits::result grisu_gen_digits(
fp value, uint64_t error, int& exp, gen_digits_handler& handler) {
const fp one(1ULL << -value.e, value.e);
// The integral part of scaled value (p1 in Grisu) = value / one. It cannot be
// zero because it contains a product of two 64-bit numbers with MSB set (due
// to normalization) - 1, shifted right by at most 60 bits.
auto integral = static_cast<uint32_t>(value.f >> -one.e);
FMT_ASSERT(integral != 0, "");
FMT_ASSERT(integral == value.f >> -one.e, "");
// The fractional part of scaled value (p2 in Grisu) c = value % one.
uint64_t fractional = value.f & (one.f - 1);
exp = count_digits(integral); // kappa in Grisu.
// Non-fixed formats require at least one digit and no precision adjustment.
if (handler.fixed) {
// Adjust fixed precision by exponent because it is relative to decimal
// point.
int precision_offset = exp + handler.exp10;
if (precision_offset > 0 &&
handler.precision > max_value<int>() - precision_offset) {
FMT_THROW(format_error("number is too big"));
}
handler.precision += precision_offset;
// Check if precision is satisfied just by leading zeros, e.g.
// format("{:.2f}", 0.001) gives "0.00" without generating any digits.
if (handler.precision <= 0) {
if (handler.precision < 0) return digits::done;
// Divide by 10 to prevent overflow.
uint64_t divisor = impl_data::power_of_10_64[exp - 1] << -one.e;
auto dir = get_round_direction(divisor, value.f / 10, error * 10);
if (dir == round_direction::unknown) return digits::error;
handler.buf[handler.size++] = dir == round_direction::up ? '1' : '0';
return digits::done;
}
}
// Generate digits for the integral part. This can produce up to 10 digits.
do {
uint32_t digit = 0;
auto divmod_integral = [&](uint32_t divisor) {
digit = integral / divisor;
integral %= divisor;
};
// This optimization by Milo Yip reduces the number of integer divisions by
// one per iteration.
switch (exp) {
case 10:
divmod_integral(1000000000);
break;
case 9:
divmod_integral(100000000);
break;
case 8:
divmod_integral(10000000);
break;
case 7:
divmod_integral(1000000);
break;
case 6:
divmod_integral(100000);
break;
case 5:
divmod_integral(10000);
break;
case 4:
divmod_integral(1000);
break;
case 3:
divmod_integral(100);
break;
case 2:
divmod_integral(10);
break;
case 1:
digit = integral;
integral = 0;
break;
default:
FMT_ASSERT(false, "invalid number of digits");
}
--exp;
auto remainder = (static_cast<uint64_t>(integral) << -one.e) + fractional;
auto result = handler.on_digit(static_cast<char>('0' + digit),
impl_data::power_of_10_64[exp] << -one.e,
remainder, error, true);
if (result != digits::more) return result;
} while (exp > 0);
// Generate digits for the fractional part.
for (;;) {
fractional *= 10;
error *= 10;
char digit = static_cast<char>('0' + (fractional >> -one.e));
fractional &= one.f - 1;
--exp;
auto result = handler.on_digit(digit, one.f, fractional, error, false);
if (result != digits::more) return result;
}
}
// A 128-bit integer type used internally,
struct uint128_wrapper {
uint128_wrapper() = default;
#if FMT_USE_INT128
uint128_t internal_;
constexpr uint128_wrapper(uint64_t high, uint64_t low) FMT_NOEXCEPT
: internal_{static_cast<uint128_t>(low) |
(static_cast<uint128_t>(high) << 64)} {}
constexpr uint128_wrapper(uint128_t u) : internal_{u} {}
constexpr uint64_t high() const FMT_NOEXCEPT {
return uint64_t(internal_ >> 64);
}
constexpr uint64_t low() const FMT_NOEXCEPT { return uint64_t(internal_); }
uint128_wrapper& operator+=(uint64_t n) FMT_NOEXCEPT {
internal_ += n;
return *this;
}
#else
uint64_t high_;
uint64_t low_;
constexpr uint128_wrapper(uint64_t high, uint64_t low) FMT_NOEXCEPT
: high_{high},
low_{low} {}
constexpr uint64_t high() const FMT_NOEXCEPT { return high_; }
constexpr uint64_t low() const FMT_NOEXCEPT { return low_; }
uint128_wrapper& operator+=(uint64_t n) FMT_NOEXCEPT {
# if defined(_MSC_VER) && defined(_M_X64)
unsigned char carry = _addcarry_u64(0, low_, n, &low_);
_addcarry_u64(carry, high_, 0, &high_);
return *this;
# else
uint64_t sum = low_ + n;
high_ += (sum < low_ ? 1 : 0);
low_ = sum;
return *this;
# endif
}
#endif
};
// Implementation of Dragonbox algorithm: https://github.com/jk-jeon/dragonbox.
namespace dragonbox {
// Computes 128-bit result of multiplication of two 64-bit unsigned integers.
inline uint128_wrapper umul128(uint64_t x, uint64_t y) FMT_NOEXCEPT {
#if FMT_USE_INT128
return static_cast<uint128_t>(x) * static_cast<uint128_t>(y);
#elif defined(_MSC_VER) && defined(_M_X64)
uint128_wrapper result;
result.low_ = _umul128(x, y, &result.high_);
return result;
#else
const uint64_t mask = (uint64_t(1) << 32) - uint64_t(1);
uint64_t a = x >> 32;
uint64_t b = x & mask;
uint64_t c = y >> 32;
uint64_t d = y & mask;
uint64_t ac = a * c;
uint64_t bc = b * c;
uint64_t ad = a * d;
uint64_t bd = b * d;
uint64_t intermediate = (bd >> 32) + (ad & mask) + (bc & mask);
return {ac + (intermediate >> 32) + (ad >> 32) + (bc >> 32),
(intermediate << 32) + (bd & mask)};
#endif
}
// Computes upper 64 bits of multiplication of two 64-bit unsigned integers.
inline uint64_t umul128_upper64(uint64_t x, uint64_t y) FMT_NOEXCEPT {
#if FMT_USE_INT128
auto p = static_cast<uint128_t>(x) * static_cast<uint128_t>(y);
return static_cast<uint64_t>(p >> 64);
#elif defined(_MSC_VER) && defined(_M_X64)
return __umulh(x, y);
#else
return umul128(x, y).high();
#endif
}
// Computes upper 64 bits of multiplication of a 64-bit unsigned integer and a
// 128-bit unsigned integer.
inline uint64_t umul192_upper64(uint64_t x, uint128_wrapper y) FMT_NOEXCEPT {
uint128_wrapper g0 = umul128(x, y.high());
g0 += umul128_upper64(x, y.low());
return g0.high();
}
// Computes upper 32 bits of multiplication of a 32-bit unsigned integer and a
// 64-bit unsigned integer.
inline uint32_t umul96_upper32(uint32_t x, uint64_t y) FMT_NOEXCEPT {
return static_cast<uint32_t>(umul128_upper64(x, y));
}
// Computes middle 64 bits of multiplication of a 64-bit unsigned integer and a
// 128-bit unsigned integer.
inline uint64_t umul192_middle64(uint64_t x, uint128_wrapper y) FMT_NOEXCEPT {
uint64_t g01 = x * y.high();
uint64_t g10 = umul128_upper64(x, y.low());
return g01 + g10;
}
// Computes lower 64 bits of multiplication of a 32-bit unsigned integer and a
// 64-bit unsigned integer.
inline uint64_t umul96_lower64(uint32_t x, uint64_t y) FMT_NOEXCEPT {
return x * y;
}
// Computes floor(log10(pow(2, e))) for e in [-1700, 1700] using the method from
// https://fmt.dev/papers/Grisu-Exact.pdf#page=5, section 3.4.
inline int floor_log10_pow2(int e) FMT_NOEXCEPT {
FMT_ASSERT(e <= 1700 && e >= -1700, "too large exponent");
const int shift = 22;
return (e * static_cast<int>(log10_2_significand >> (64 - shift))) >> shift;
}
// Various fast log computations.
inline int floor_log2_pow10(int e) FMT_NOEXCEPT {
FMT_ASSERT(e <= 1233 && e >= -1233, "too large exponent");
const uint64_t log2_10_integer_part = 3;
const uint64_t log2_10_fractional_digits = 0x5269e12f346e2bf9;
const int shift_amount = 19;
return (e * static_cast<int>(
(log2_10_integer_part << shift_amount) |
(log2_10_fractional_digits >> (64 - shift_amount)))) >>
shift_amount;
}
inline int floor_log10_pow2_minus_log10_4_over_3(int e) FMT_NOEXCEPT {
FMT_ASSERT(e <= 1700 && e >= -1700, "too large exponent");
const uint64_t log10_4_over_3_fractional_digits = 0x1ffbfc2bbc780375;
const int shift_amount = 22;
return (e * static_cast<int>(log10_2_significand >> (64 - shift_amount)) -
static_cast<int>(log10_4_over_3_fractional_digits >>
(64 - shift_amount))) >>
shift_amount;
}
// Returns true iff x is divisible by pow(2, exp).
inline bool divisible_by_power_of_2(uint32_t x, int exp) FMT_NOEXCEPT {
FMT_ASSERT(exp >= 1, "");
FMT_ASSERT(x != 0, "");
#ifdef FMT_BUILTIN_CTZ
return FMT_BUILTIN_CTZ(x) >= exp;
#else
return exp < num_bits<uint32_t>() && x == ((x >> exp) << exp);
#endif
}
inline bool divisible_by_power_of_2(uint64_t x, int exp) FMT_NOEXCEPT {
FMT_ASSERT(exp >= 1, "");
FMT_ASSERT(x != 0, "");
#ifdef FMT_BUILTIN_CTZLL
return FMT_BUILTIN_CTZLL(x) >= exp;
#else
return exp < num_bits<uint64_t>() && x == ((x >> exp) << exp);
#endif
}
// Table entry type for divisibility test.
template <typename T> struct divtest_table_entry {
T mod_inv;
T max_quotient;
};
// Returns true iff x is divisible by pow(5, exp).
inline bool divisible_by_power_of_5(uint32_t x, int exp) FMT_NOEXCEPT {
FMT_ASSERT(exp <= 10, "too large exponent");
static constexpr const divtest_table_entry<uint32_t> divtest_table[] = {
{0x00000001, 0xffffffff}, {0xcccccccd, 0x33333333},
{0xc28f5c29, 0x0a3d70a3}, {0x26e978d5, 0x020c49ba},
{0x3afb7e91, 0x0068db8b}, {0x0bcbe61d, 0x0014f8b5},
{0x68c26139, 0x000431bd}, {0xae8d46a5, 0x0000d6bf},
{0x22e90e21, 0x00002af3}, {0x3a2e9c6d, 0x00000897},
{0x3ed61f49, 0x000001b7}};
return x * divtest_table[exp].mod_inv <= divtest_table[exp].max_quotient;
}
inline bool divisible_by_power_of_5(uint64_t x, int exp) FMT_NOEXCEPT {
FMT_ASSERT(exp <= 23, "too large exponent");
static constexpr const divtest_table_entry<uint64_t> divtest_table[] = {
{0x0000000000000001, 0xffffffffffffffff},
{0xcccccccccccccccd, 0x3333333333333333},
{0x8f5c28f5c28f5c29, 0x0a3d70a3d70a3d70},
{0x1cac083126e978d5, 0x020c49ba5e353f7c},
{0xd288ce703afb7e91, 0x0068db8bac710cb2},
{0x5d4e8fb00bcbe61d, 0x0014f8b588e368f0},
{0x790fb65668c26139, 0x000431bde82d7b63},
{0xe5032477ae8d46a5, 0x0000d6bf94d5e57a},
{0xc767074b22e90e21, 0x00002af31dc46118},
{0x8e47ce423a2e9c6d, 0x0000089705f4136b},
{0x4fa7f60d3ed61f49, 0x000001b7cdfd9d7b},
{0x0fee64690c913975, 0x00000057f5ff85e5},
{0x3662e0e1cf503eb1, 0x000000119799812d},
{0xa47a2cf9f6433fbd, 0x0000000384b84d09},
{0x54186f653140a659, 0x00000000b424dc35},
{0x7738164770402145, 0x0000000024075f3d},
{0xe4a4d1417cd9a041, 0x000000000734aca5},
{0xc75429d9e5c5200d, 0x000000000170ef54},
{0xc1773b91fac10669, 0x000000000049c977},
{0x26b172506559ce15, 0x00000000000ec1e4},
{0xd489e3a9addec2d1, 0x000000000002f394},
{0x90e860bb892c8d5d, 0x000000000000971d},
{0x502e79bf1b6f4f79, 0x0000000000001e39},
{0xdcd618596be30fe5, 0x000000000000060b}};
return x * divtest_table[exp].mod_inv <= divtest_table[exp].max_quotient;
}
// Replaces n by floor(n / pow(5, N)) returning true if and only if n is
// divisible by pow(5, N).
// Precondition: n <= 2 * pow(5, N + 1).
template <int N>
bool check_divisibility_and_divide_by_pow5(uint32_t& n) FMT_NOEXCEPT {
static constexpr struct {
uint32_t magic_number;
int bits_for_comparison;
uint32_t threshold;
int shift_amount;
} infos[] = {{0xcccd, 16, 0x3333, 18}, {0xa429, 8, 0x0a, 20}};
constexpr auto info = infos[N - 1];
n *= info.magic_number;
const uint32_t comparison_mask = (1u << info.bits_for_comparison) - 1;
bool result = (n & comparison_mask) <= info.threshold;
n >>= info.shift_amount;
return result;
}
// Computes floor(n / pow(10, N)) for small n and N.
// Precondition: n <= pow(10, N + 1).
template <int N> uint32_t small_division_by_pow10(uint32_t n) FMT_NOEXCEPT {
static constexpr struct {
uint32_t magic_number;
int shift_amount;
uint32_t divisor_times_10;
} infos[] = {{0xcccd, 19, 100}, {0xa3d8, 22, 1000}};
constexpr auto info = infos[N - 1];
FMT_ASSERT(n <= info.divisor_times_10, "n is too large");
return n * info.magic_number >> info.shift_amount;
}
// Computes floor(n / 10^(kappa + 1)) (float)
inline uint32_t divide_by_10_to_kappa_plus_1(uint32_t n) FMT_NOEXCEPT {
return n / float_info<float>::big_divisor;
}
// Computes floor(n / 10^(kappa + 1)) (double)
inline uint64_t divide_by_10_to_kappa_plus_1(uint64_t n) FMT_NOEXCEPT {
return umul128_upper64(n, 0x83126e978d4fdf3c) >> 9;
}
// Various subroutines using pow10 cache
template <class T> struct cache_accessor;
template <> struct cache_accessor<float> {
using carrier_uint = float_info<float>::carrier_uint;
using cache_entry_type = uint64_t;
static uint64_t get_cached_power(int k) FMT_NOEXCEPT {
FMT_ASSERT(k >= float_info<float>::min_k && k <= float_info<float>::max_k,
"k is out of range");
static constexpr const uint64_t pow10_significands[] = {
0x81ceb32c4b43fcf5, 0xa2425ff75e14fc32, 0xcad2f7f5359a3b3f,
0xfd87b5f28300ca0e, 0x9e74d1b791e07e49, 0xc612062576589ddb,
0xf79687aed3eec552, 0x9abe14cd44753b53, 0xc16d9a0095928a28,
0xf1c90080baf72cb2, 0x971da05074da7bef, 0xbce5086492111aeb,
0xec1e4a7db69561a6, 0x9392ee8e921d5d08, 0xb877aa3236a4b44a,
0xe69594bec44de15c, 0x901d7cf73ab0acda, 0xb424dc35095cd810,
0xe12e13424bb40e14, 0x8cbccc096f5088cc, 0xafebff0bcb24aaff,
0xdbe6fecebdedd5bf, 0x89705f4136b4a598, 0xabcc77118461cefd,
0xd6bf94d5e57a42bd, 0x8637bd05af6c69b6, 0xa7c5ac471b478424,
0xd1b71758e219652c, 0x83126e978d4fdf3c, 0xa3d70a3d70a3d70b,
0xcccccccccccccccd, 0x8000000000000000, 0xa000000000000000,
0xc800000000000000, 0xfa00000000000000, 0x9c40000000000000,
0xc350000000000000, 0xf424000000000000, 0x9896800000000000,
0xbebc200000000000, 0xee6b280000000000, 0x9502f90000000000,
0xba43b74000000000, 0xe8d4a51000000000, 0x9184e72a00000000,
0xb5e620f480000000, 0xe35fa931a0000000, 0x8e1bc9bf04000000,
0xb1a2bc2ec5000000, 0xde0b6b3a76400000, 0x8ac7230489e80000,
0xad78ebc5ac620000, 0xd8d726b7177a8000, 0x878678326eac9000,
0xa968163f0a57b400, 0xd3c21bcecceda100, 0x84595161401484a0,
0xa56fa5b99019a5c8, 0xcecb8f27f4200f3a, 0x813f3978f8940984,
0xa18f07d736b90be5, 0xc9f2c9cd04674ede, 0xfc6f7c4045812296,
0x9dc5ada82b70b59d, 0xc5371912364ce305, 0xf684df56c3e01bc6,
0x9a130b963a6c115c, 0xc097ce7bc90715b3, 0xf0bdc21abb48db20,
0x96769950b50d88f4, 0xbc143fa4e250eb31, 0xeb194f8e1ae525fd,
0x92efd1b8d0cf37be, 0xb7abc627050305ad, 0xe596b7b0c643c719,
0x8f7e32ce7bea5c6f, 0xb35dbf821ae4f38b, 0xe0352f62a19e306e};
return pow10_significands[k - float_info<float>::min_k];
}
static carrier_uint compute_mul(carrier_uint u,
const cache_entry_type& cache) FMT_NOEXCEPT {
return umul96_upper32(u, cache);
}
static uint32_t compute_delta(const cache_entry_type& cache,
int beta_minus_1) FMT_NOEXCEPT {
return static_cast<uint32_t>(cache >> (64 - 1 - beta_minus_1));
}
static bool compute_mul_parity(carrier_uint two_f,
const cache_entry_type& cache,
int beta_minus_1) FMT_NOEXCEPT {
FMT_ASSERT(beta_minus_1 >= 1, "");
FMT_ASSERT(beta_minus_1 < 64, "");
return ((umul96_lower64(two_f, cache) >> (64 - beta_minus_1)) & 1) != 0;
}
static carrier_uint compute_left_endpoint_for_shorter_interval_case(
const cache_entry_type& cache, int beta_minus_1) FMT_NOEXCEPT {
return static_cast<carrier_uint>(
(cache - (cache >> (float_info<float>::significand_bits + 2))) >>
(64 - float_info<float>::significand_bits - 1 - beta_minus_1));
}
static carrier_uint compute_right_endpoint_for_shorter_interval_case(
const cache_entry_type& cache, int beta_minus_1) FMT_NOEXCEPT {
return static_cast<carrier_uint>(
(cache + (cache >> (float_info<float>::significand_bits + 1))) >>
(64 - float_info<float>::significand_bits - 1 - beta_minus_1));
}
static carrier_uint compute_round_up_for_shorter_interval_case(
const cache_entry_type& cache, int beta_minus_1) FMT_NOEXCEPT {
return (static_cast<carrier_uint>(
cache >>
(64 - float_info<float>::significand_bits - 2 - beta_minus_1)) +
1) /
2;
}
};
template <> struct cache_accessor<double> {
using carrier_uint = float_info<double>::carrier_uint;
using cache_entry_type = uint128_wrapper;
static uint128_wrapper get_cached_power(int k) FMT_NOEXCEPT {
FMT_ASSERT(k >= float_info<double>::min_k && k <= float_info<double>::max_k,
"k is out of range");
static constexpr const uint128_wrapper pow10_significands[] = {
#if FMT_USE_FULL_CACHE_DRAGONBOX
{0xff77b1fcbebcdc4f, 0x25e8e89c13bb0f7b},
{0x9faacf3df73609b1, 0x77b191618c54e9ad},
{0xc795830d75038c1d, 0xd59df5b9ef6a2418},
{0xf97ae3d0d2446f25, 0x4b0573286b44ad1e},
{0x9becce62836ac577, 0x4ee367f9430aec33},
{0xc2e801fb244576d5, 0x229c41f793cda740},
{0xf3a20279ed56d48a, 0x6b43527578c11110},
{0x9845418c345644d6, 0x830a13896b78aaaa},
{0xbe5691ef416bd60c, 0x23cc986bc656d554},
{0xedec366b11c6cb8f, 0x2cbfbe86b7ec8aa9},
{0x94b3a202eb1c3f39, 0x7bf7d71432f3d6aa},
{0xb9e08a83a5e34f07, 0xdaf5ccd93fb0cc54},
{0xe858ad248f5c22c9, 0xd1b3400f8f9cff69},
{0x91376c36d99995be, 0x23100809b9c21fa2},
{0xb58547448ffffb2d, 0xabd40a0c2832a78b},
{0xe2e69915b3fff9f9, 0x16c90c8f323f516d},
{0x8dd01fad907ffc3b, 0xae3da7d97f6792e4},
{0xb1442798f49ffb4a, 0x99cd11cfdf41779d},
{0xdd95317f31c7fa1d, 0x40405643d711d584},
{0x8a7d3eef7f1cfc52, 0x482835ea666b2573},
{0xad1c8eab5ee43b66, 0xda3243650005eed0},
{0xd863b256369d4a40, 0x90bed43e40076a83},
{0x873e4f75e2224e68, 0x5a7744a6e804a292},
{0xa90de3535aaae202, 0x711515d0a205cb37},
{0xd3515c2831559a83, 0x0d5a5b44ca873e04},
{0x8412d9991ed58091, 0xe858790afe9486c3},
{0xa5178fff668ae0b6, 0x626e974dbe39a873},
{0xce5d73ff402d98e3, 0xfb0a3d212dc81290},
{0x80fa687f881c7f8e, 0x7ce66634bc9d0b9a},
{0xa139029f6a239f72, 0x1c1fffc1ebc44e81},
{0xc987434744ac874e, 0xa327ffb266b56221},
{0xfbe9141915d7a922, 0x4bf1ff9f0062baa9},
{0x9d71ac8fada6c9b5, 0x6f773fc3603db4aa},
{0xc4ce17b399107c22, 0xcb550fb4384d21d4},
{0xf6019da07f549b2b, 0x7e2a53a146606a49},
{0x99c102844f94e0fb, 0x2eda7444cbfc426e},
{0xc0314325637a1939, 0xfa911155fefb5309},
{0xf03d93eebc589f88, 0x793555ab7eba27cb},
{0x96267c7535b763b5, 0x4bc1558b2f3458df},
{0xbbb01b9283253ca2, 0x9eb1aaedfb016f17},
{0xea9c227723ee8bcb, 0x465e15a979c1cadd},
{0x92a1958a7675175f, 0x0bfacd89ec191eca},
{0xb749faed14125d36, 0xcef980ec671f667c},
{0xe51c79a85916f484, 0x82b7e12780e7401b},
{0x8f31cc0937ae58d2, 0xd1b2ecb8b0908811},
{0xb2fe3f0b8599ef07, 0x861fa7e6dcb4aa16},
{0xdfbdcece67006ac9, 0x67a791e093e1d49b},
{0x8bd6a141006042bd, 0xe0c8bb2c5c6d24e1},
{0xaecc49914078536d, 0x58fae9f773886e19},
{0xda7f5bf590966848, 0xaf39a475506a899f},
{0x888f99797a5e012d, 0x6d8406c952429604},
{0xaab37fd7d8f58178, 0xc8e5087ba6d33b84},
{0xd5605fcdcf32e1d6, 0xfb1e4a9a90880a65},
{0x855c3be0a17fcd26, 0x5cf2eea09a550680},
{0xa6b34ad8c9dfc06f, 0xf42faa48c0ea481f},
{0xd0601d8efc57b08b, 0xf13b94daf124da27},
{0x823c12795db6ce57, 0x76c53d08d6b70859},
{0xa2cb1717b52481ed, 0x54768c4b0c64ca6f},
{0xcb7ddcdda26da268, 0xa9942f5dcf7dfd0a},
{0xfe5d54150b090b02, 0xd3f93b35435d7c4d},
{0x9efa548d26e5a6e1, 0xc47bc5014a1a6db0},
{0xc6b8e9b0709f109a, 0x359ab6419ca1091c},
{0xf867241c8cc6d4c0, 0xc30163d203c94b63},
{0x9b407691d7fc44f8, 0x79e0de63425dcf1e},
{0xc21094364dfb5636, 0x985915fc12f542e5},
{0xf294b943e17a2bc4, 0x3e6f5b7b17b2939e},
{0x979cf3ca6cec5b5a, 0xa705992ceecf9c43},
{0xbd8430bd08277231, 0x50c6ff782a838354},
{0xece53cec4a314ebd, 0xa4f8bf5635246429},
{0x940f4613ae5ed136, 0x871b7795e136be9a},
{0xb913179899f68584, 0x28e2557b59846e40},
{0xe757dd7ec07426e5, 0x331aeada2fe589d0},
{0x9096ea6f3848984f, 0x3ff0d2c85def7622},
{0xb4bca50b065abe63, 0x0fed077a756b53aa},
{0xe1ebce4dc7f16dfb, 0xd3e8495912c62895},
{0x8d3360f09cf6e4bd, 0x64712dd7abbbd95d},
{0xb080392cc4349dec, 0xbd8d794d96aacfb4},
{0xdca04777f541c567, 0xecf0d7a0fc5583a1},
{0x89e42caaf9491b60, 0xf41686c49db57245},
{0xac5d37d5b79b6239, 0x311c2875c522ced6},
{0xd77485cb25823ac7, 0x7d633293366b828c},
{0x86a8d39ef77164bc, 0xae5dff9c02033198},
{0xa8530886b54dbdeb, 0xd9f57f830283fdfd},
{0xd267caa862a12d66, 0xd072df63c324fd7c},
{0x8380dea93da4bc60, 0x4247cb9e59f71e6e},
{0xa46116538d0deb78, 0x52d9be85f074e609},
{0xcd795be870516656, 0x67902e276c921f8c},
{0x806bd9714632dff6, 0x00ba1cd8a3db53b7},
{0xa086cfcd97bf97f3, 0x80e8a40eccd228a5},
{0xc8a883c0fdaf7df0, 0x6122cd128006b2ce},
{0xfad2a4b13d1b5d6c, 0x796b805720085f82},
{0x9cc3a6eec6311a63, 0xcbe3303674053bb1},
{0xc3f490aa77bd60fc, 0xbedbfc4411068a9d},
{0xf4f1b4d515acb93b, 0xee92fb5515482d45},
{0x991711052d8bf3c5, 0x751bdd152d4d1c4b},
{0xbf5cd54678eef0b6, 0xd262d45a78a0635e},
{0xef340a98172aace4, 0x86fb897116c87c35},
{0x9580869f0e7aac0e, 0xd45d35e6ae3d4da1},
{0xbae0a846d2195712, 0x8974836059cca10a},
{0xe998d258869facd7, 0x2bd1a438703fc94c},
{0x91ff83775423cc06, 0x7b6306a34627ddd0},
{0xb67f6455292cbf08, 0x1a3bc84c17b1d543},
{0xe41f3d6a7377eeca, 0x20caba5f1d9e4a94},
{0x8e938662882af53e, 0x547eb47b7282ee9d},
{0xb23867fb2a35b28d, 0xe99e619a4f23aa44},
{0xdec681f9f4c31f31, 0x6405fa00e2ec94d5},
{0x8b3c113c38f9f37e, 0xde83bc408dd3dd05},
{0xae0b158b4738705e, 0x9624ab50b148d446},
{0xd98ddaee19068c76, 0x3badd624dd9b0958},
{0x87f8a8d4cfa417c9, 0xe54ca5d70a80e5d7},
{0xa9f6d30a038d1dbc, 0x5e9fcf4ccd211f4d},
{0xd47487cc8470652b, 0x7647c32000696720},
{0x84c8d4dfd2c63f3b, 0x29ecd9f40041e074},
{0xa5fb0a17c777cf09, 0xf468107100525891},
{0xcf79cc9db955c2cc, 0x7182148d4066eeb5},
{0x81ac1fe293d599bf, 0xc6f14cd848405531},
{0xa21727db38cb002f, 0xb8ada00e5a506a7d},
{0xca9cf1d206fdc03b, 0xa6d90811f0e4851d},
{0xfd442e4688bd304a, 0x908f4a166d1da664},
{0x9e4a9cec15763e2e, 0x9a598e4e043287ff},
{0xc5dd44271ad3cdba, 0x40eff1e1853f29fe},
{0xf7549530e188c128, 0xd12bee59e68ef47d},
{0x9a94dd3e8cf578b9, 0x82bb74f8301958cf},
{0xc13a148e3032d6e7, 0xe36a52363c1faf02},
{0xf18899b1bc3f8ca1, 0xdc44e6c3cb279ac2},
{0x96f5600f15a7b7e5, 0x29ab103a5ef8c0ba},
{0xbcb2b812db11a5de, 0x7415d448f6b6f0e8},
{0xebdf661791d60f56, 0x111b495b3464ad22},
{0x936b9fcebb25c995, 0xcab10dd900beec35},
{0xb84687c269ef3bfb, 0x3d5d514f40eea743},
{0xe65829b3046b0afa, 0x0cb4a5a3112a5113},
{0x8ff71a0fe2c2e6dc, 0x47f0e785eaba72ac},
{0xb3f4e093db73a093, 0x59ed216765690f57},
{0xe0f218b8d25088b8, 0x306869c13ec3532d},
{0x8c974f7383725573, 0x1e414218c73a13fc},
{0xafbd2350644eeacf, 0xe5d1929ef90898fb},
{0xdbac6c247d62a583, 0xdf45f746b74abf3a},
{0x894bc396ce5da772, 0x6b8bba8c328eb784},
{0xab9eb47c81f5114f, 0x066ea92f3f326565},
{0xd686619ba27255a2, 0xc80a537b0efefebe},
{0x8613fd0145877585, 0xbd06742ce95f5f37},
{0xa798fc4196e952e7, 0x2c48113823b73705},
{0xd17f3b51fca3a7a0, 0xf75a15862ca504c6},
{0x82ef85133de648c4, 0x9a984d73dbe722fc},
{0xa3ab66580d5fdaf5, 0xc13e60d0d2e0ebbb},
{0xcc963fee10b7d1b3, 0x318df905079926a9},
{0xffbbcfe994e5c61f, 0xfdf17746497f7053},
{0x9fd561f1fd0f9bd3, 0xfeb6ea8bedefa634},
{0xc7caba6e7c5382c8, 0xfe64a52ee96b8fc1},
{0xf9bd690a1b68637b, 0x3dfdce7aa3c673b1},
{0x9c1661a651213e2d, 0x06bea10ca65c084f},
{0xc31bfa0fe5698db8, 0x486e494fcff30a63},
{0xf3e2f893dec3f126, 0x5a89dba3c3efccfb},
{0x986ddb5c6b3a76b7, 0xf89629465a75e01d},
{0xbe89523386091465, 0xf6bbb397f1135824},
{0xee2ba6c0678b597f, 0x746aa07ded582e2d},
{0x94db483840b717ef, 0xa8c2a44eb4571cdd},
{0xba121a4650e4ddeb, 0x92f34d62616ce414},
{0xe896a0d7e51e1566, 0x77b020baf9c81d18},
{0x915e2486ef32cd60, 0x0ace1474dc1d122f},
{0xb5b5ada8aaff80b8, 0x0d819992132456bb},
{0xe3231912d5bf60e6, 0x10e1fff697ed6c6a},
{0x8df5efabc5979c8f, 0xca8d3ffa1ef463c2},
{0xb1736b96b6fd83b3, 0xbd308ff8a6b17cb3},
{0xddd0467c64bce4a0, 0xac7cb3f6d05ddbdf},
{0x8aa22c0dbef60ee4, 0x6bcdf07a423aa96c},
{0xad4ab7112eb3929d, 0x86c16c98d2c953c7},
{0xd89d64d57a607744, 0xe871c7bf077ba8b8},
{0x87625f056c7c4a8b, 0x11471cd764ad4973},
{0xa93af6c6c79b5d2d, 0xd598e40d3dd89bd0},
{0xd389b47879823479, 0x4aff1d108d4ec2c4},
{0x843610cb4bf160cb, 0xcedf722a585139bb},
{0xa54394fe1eedb8fe, 0xc2974eb4ee658829},
{0xce947a3da6a9273e, 0x733d226229feea33},
{0x811ccc668829b887, 0x0806357d5a3f5260},
{0xa163ff802a3426a8, 0xca07c2dcb0cf26f8},
{0xc9bcff6034c13052, 0xfc89b393dd02f0b6},
{0xfc2c3f3841f17c67, 0xbbac2078d443ace3},
{0x9d9ba7832936edc0, 0xd54b944b84aa4c0e},
{0xc5029163f384a931, 0x0a9e795e65d4df12},
{0xf64335bcf065d37d, 0x4d4617b5ff4a16d6},
{0x99ea0196163fa42e, 0x504bced1bf8e4e46},
{0xc06481fb9bcf8d39, 0xe45ec2862f71e1d7},
{0xf07da27a82c37088, 0x5d767327bb4e5a4d},
{0x964e858c91ba2655, 0x3a6a07f8d510f870},
{0xbbe226efb628afea, 0x890489f70a55368c},
{0xeadab0aba3b2dbe5, 0x2b45ac74ccea842f},
{0x92c8ae6b464fc96f, 0x3b0b8bc90012929e},
{0xb77ada0617e3bbcb, 0x09ce6ebb40173745},
{0xe55990879ddcaabd, 0xcc420a6a101d0516},
{0x8f57fa54c2a9eab6, 0x9fa946824a12232e},
{0xb32df8e9f3546564, 0x47939822dc96abfa},
{0xdff9772470297ebd, 0x59787e2b93bc56f8},
{0x8bfbea76c619ef36, 0x57eb4edb3c55b65b},
{0xaefae51477a06b03, 0xede622920b6b23f2},
{0xdab99e59958885c4, 0xe95fab368e45ecee},
{0x88b402f7fd75539b, 0x11dbcb0218ebb415},
{0xaae103b5fcd2a881, 0xd652bdc29f26a11a},
{0xd59944a37c0752a2, 0x4be76d3346f04960},
{0x857fcae62d8493a5, 0x6f70a4400c562ddc},
{0xa6dfbd9fb8e5b88e, 0xcb4ccd500f6bb953},
{0xd097ad07a71f26b2, 0x7e2000a41346a7a8},
{0x825ecc24c873782f, 0x8ed400668c0c28c9},
{0xa2f67f2dfa90563b, 0x728900802f0f32fb},
{0xcbb41ef979346bca, 0x4f2b40a03ad2ffba},
{0xfea126b7d78186bc, 0xe2f610c84987bfa9},
{0x9f24b832e6b0f436, 0x0dd9ca7d2df4d7ca},
{0xc6ede63fa05d3143, 0x91503d1c79720dbc},
{0xf8a95fcf88747d94, 0x75a44c6397ce912b},
{0x9b69dbe1b548ce7c, 0xc986afbe3ee11abb},
{0xc24452da229b021b, 0xfbe85badce996169},
{0xf2d56790ab41c2a2, 0xfae27299423fb9c4},
{0x97c560ba6b0919a5, 0xdccd879fc967d41b},
{0xbdb6b8e905cb600f, 0x5400e987bbc1c921},
{0xed246723473e3813, 0x290123e9aab23b69},
{0x9436c0760c86e30b, 0xf9a0b6720aaf6522},
{0xb94470938fa89bce, 0xf808e40e8d5b3e6a},
{0xe7958cb87392c2c2, 0xb60b1d1230b20e05},
{0x90bd77f3483bb9b9, 0xb1c6f22b5e6f48c3},
{0xb4ecd5f01a4aa828, 0x1e38aeb6360b1af4},
{0xe2280b6c20dd5232, 0x25c6da63c38de1b1},
{0x8d590723948a535f, 0x579c487e5a38ad0f},
{0xb0af48ec79ace837, 0x2d835a9df0c6d852},
{0xdcdb1b2798182244, 0xf8e431456cf88e66},
{0x8a08f0f8bf0f156b, 0x1b8e9ecb641b5900},
{0xac8b2d36eed2dac5, 0xe272467e3d222f40},
{0xd7adf884aa879177, 0x5b0ed81dcc6abb10},
{0x86ccbb52ea94baea, 0x98e947129fc2b4ea},
{0xa87fea27a539e9a5, 0x3f2398d747b36225},
{0xd29fe4b18e88640e, 0x8eec7f0d19a03aae},
{0x83a3eeeef9153e89, 0x1953cf68300424ad},
{0xa48ceaaab75a8e2b, 0x5fa8c3423c052dd8},
{0xcdb02555653131b6, 0x3792f412cb06794e},
{0x808e17555f3ebf11, 0xe2bbd88bbee40bd1},
{0xa0b19d2ab70e6ed6, 0x5b6aceaeae9d0ec5},
{0xc8de047564d20a8b, 0xf245825a5a445276},
{0xfb158592be068d2e, 0xeed6e2f0f0d56713},
{0x9ced737bb6c4183d, 0x55464dd69685606c},
{0xc428d05aa4751e4c, 0xaa97e14c3c26b887},
{0xf53304714d9265df, 0xd53dd99f4b3066a9},
{0x993fe2c6d07b7fab, 0xe546a8038efe402a},
{0xbf8fdb78849a5f96, 0xde98520472bdd034},
{0xef73d256a5c0f77c, 0x963e66858f6d4441},
{0x95a8637627989aad, 0xdde7001379a44aa9},
{0xbb127c53b17ec159, 0x5560c018580d5d53},
{0xe9d71b689dde71af, 0xaab8f01e6e10b4a7},
{0x9226712162ab070d, 0xcab3961304ca70e9},
{0xb6b00d69bb55c8d1, 0x3d607b97c5fd0d23},
{0xe45c10c42a2b3b05, 0x8cb89a7db77c506b},
{0x8eb98a7a9a5b04e3, 0x77f3608e92adb243},
{0xb267ed1940f1c61c, 0x55f038b237591ed4},
{0xdf01e85f912e37a3, 0x6b6c46dec52f6689},
{0x8b61313bbabce2c6, 0x2323ac4b3b3da016},
{0xae397d8aa96c1b77, 0xabec975e0a0d081b},
{0xd9c7dced53c72255, 0x96e7bd358c904a22},
{0x881cea14545c7575, 0x7e50d64177da2e55},
{0xaa242499697392d2, 0xdde50bd1d5d0b9ea},
{0xd4ad2dbfc3d07787, 0x955e4ec64b44e865},
{0x84ec3c97da624ab4, 0xbd5af13bef0b113f},
{0xa6274bbdd0fadd61, 0xecb1ad8aeacdd58f},
{0xcfb11ead453994ba, 0x67de18eda5814af3},
{0x81ceb32c4b43fcf4, 0x80eacf948770ced8},
{0xa2425ff75e14fc31, 0xa1258379a94d028e},
{0xcad2f7f5359a3b3e, 0x096ee45813a04331},
{0xfd87b5f28300ca0d, 0x8bca9d6e188853fd},
{0x9e74d1b791e07e48, 0x775ea264cf55347e},
{0xc612062576589dda, 0x95364afe032a819e},
{0xf79687aed3eec551, 0x3a83ddbd83f52205},
{0x9abe14cd44753b52, 0xc4926a9672793543},
{0xc16d9a0095928a27, 0x75b7053c0f178294},
{0xf1c90080baf72cb1, 0x5324c68b12dd6339},
{0x971da05074da7bee, 0xd3f6fc16ebca5e04},
{0xbce5086492111aea, 0x88f4bb1ca6bcf585},
{0xec1e4a7db69561a5, 0x2b31e9e3d06c32e6},
{0x9392ee8e921d5d07, 0x3aff322e62439fd0},
{0xb877aa3236a4b449, 0x09befeb9fad487c3},
{0xe69594bec44de15b, 0x4c2ebe687989a9b4},
{0x901d7cf73ab0acd9, 0x0f9d37014bf60a11},
{0xb424dc35095cd80f, 0x538484c19ef38c95},
{0xe12e13424bb40e13, 0x2865a5f206b06fba},
{0x8cbccc096f5088cb, 0xf93f87b7442e45d4},
{0xafebff0bcb24aafe, 0xf78f69a51539d749},
{0xdbe6fecebdedd5be, 0xb573440e5a884d1c},
{0x89705f4136b4a597, 0x31680a88f8953031},
{0xabcc77118461cefc, 0xfdc20d2b36ba7c3e},
{0xd6bf94d5e57a42bc, 0x3d32907604691b4d},
{0x8637bd05af6c69b5, 0xa63f9a49c2c1b110},
{0xa7c5ac471b478423, 0x0fcf80dc33721d54},
{0xd1b71758e219652b, 0xd3c36113404ea4a9},
{0x83126e978d4fdf3b, 0x645a1cac083126ea},
{0xa3d70a3d70a3d70a, 0x3d70a3d70a3d70a4},
{0xcccccccccccccccc, 0xcccccccccccccccd},
{0x8000000000000000, 0x0000000000000000},
{0xa000000000000000, 0x0000000000000000},
{0xc800000000000000, 0x0000000000000000},
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{0xb6472e511c81471d, 0xe0133fe4adf8e952},
{0xe3d8f9e563a198e5, 0x58180fddd97723a6},
{0x8e679c2f5e44ff8f, 0x570f09eaa7ea7648},
{0xb201833b35d63f73, 0x2cd2cc6551e513da},
{0xde81e40a034bcf4f, 0xf8077f7ea65e58d1},
{0x8b112e86420f6191, 0xfb04afaf27faf782},
{0xadd57a27d29339f6, 0x79c5db9af1f9b563},
{0xd94ad8b1c7380874, 0x18375281ae7822bc},
{0x87cec76f1c830548, 0x8f2293910d0b15b5},
{0xa9c2794ae3a3c69a, 0xb2eb3875504ddb22},
{0xd433179d9c8cb841, 0x5fa60692a46151eb},
{0x849feec281d7f328, 0xdbc7c41ba6bcd333},
{0xa5c7ea73224deff3, 0x12b9b522906c0800},
{0xcf39e50feae16bef, 0xd768226b34870a00},
{0x81842f29f2cce375, 0xe6a1158300d46640},
{0xa1e53af46f801c53, 0x60495ae3c1097fd0},
{0xca5e89b18b602368, 0x385bb19cb14bdfc4},
{0xfcf62c1dee382c42, 0x46729e03dd9ed7b5},
{0x9e19db92b4e31ba9, 0x6c07a2c26a8346d1},
{0xc5a05277621be293, 0xc7098b7305241885},
{ 0xf70867153aa2db38,
0xb8cbee4fc66d1ea7 }
#else
{0xff77b1fcbebcdc4f, 0x25e8e89c13bb0f7b},
{0xce5d73ff402d98e3, 0xfb0a3d212dc81290},
{0xa6b34ad8c9dfc06f, 0xf42faa48c0ea481f},
{0x86a8d39ef77164bc, 0xae5dff9c02033198},
{0xd98ddaee19068c76, 0x3badd624dd9b0958},
{0xafbd2350644eeacf, 0xe5d1929ef90898fb},
{0x8df5efabc5979c8f, 0xca8d3ffa1ef463c2},
{0xe55990879ddcaabd, 0xcc420a6a101d0516},
{0xb94470938fa89bce, 0xf808e40e8d5b3e6a},
{0x95a8637627989aad, 0xdde7001379a44aa9},
{0xf1c90080baf72cb1, 0x5324c68b12dd6339},
{0xc350000000000000, 0x0000000000000000},
{0x9dc5ada82b70b59d, 0xf020000000000000},
{0xfee50b7025c36a08, 0x02f236d04753d5b4},
{0xcde6fd5e09abcf26, 0xed4c0226b55e6f86},
{0xa6539930bf6bff45, 0x84db8346b786151c},
{0x865b86925b9bc5c2, 0x0b8a2392ba45a9b2},
{0xd910f7ff28069da4, 0x1b2ba1518094da04},
{0xaf58416654a6babb, 0x387ac8d1970027b2},
{0x8da471a9de737e24, 0x5ceaecfed289e5d2},
{0xe4d5e82392a40515, 0x0fabaf3feaa5334a},
{0xb8da1662e7b00a17, 0x3d6a751f3b936243},
{ 0x95527a5202df0ccb,
0x0f37801e0c43ebc8 }
#endif
};
#if FMT_USE_FULL_CACHE_DRAGONBOX
return pow10_significands[k - float_info<double>::min_k];
#else
static constexpr const uint64_t powers_of_5_64[] = {
0x0000000000000001, 0x0000000000000005, 0x0000000000000019,
0x000000000000007d, 0x0000000000000271, 0x0000000000000c35,
0x0000000000003d09, 0x000000000001312d, 0x000000000005f5e1,
0x00000000001dcd65, 0x00000000009502f9, 0x0000000002e90edd,
0x000000000e8d4a51, 0x0000000048c27395, 0x000000016bcc41e9,
0x000000071afd498d, 0x0000002386f26fc1, 0x000000b1a2bc2ec5,
0x000003782dace9d9, 0x00001158e460913d, 0x000056bc75e2d631,
0x0001b1ae4d6e2ef5, 0x000878678326eac9, 0x002a5a058fc295ed,
0x00d3c21bcecceda1, 0x0422ca8b0a00a425, 0x14adf4b7320334b9};
static constexpr const uint32_t pow10_recovery_errors[] = {
0x50001400, 0x54044100, 0x54014555, 0x55954415, 0x54115555, 0x00000001,
0x50000000, 0x00104000, 0x54010004, 0x05004001, 0x55555544, 0x41545555,
0x54040551, 0x15445545, 0x51555514, 0x10000015, 0x00101100, 0x01100015,
0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x04450514, 0x45414110,
0x55555145, 0x50544050, 0x15040155, 0x11054140, 0x50111514, 0x11451454,
0x00400541, 0x00000000, 0x55555450, 0x10056551, 0x10054011, 0x55551014,
0x69514555, 0x05151109, 0x00155555};
static const int compression_ratio = 27;
// Compute base index.
int cache_index = (k - float_info<double>::min_k) / compression_ratio;
int kb = cache_index * compression_ratio + float_info<double>::min_k;
int offset = k - kb;
// Get base cache.
uint128_wrapper base_cache = pow10_significands[cache_index];
if (offset == 0) return base_cache;
// Compute the required amount of bit-shift.
int alpha = floor_log2_pow10(kb + offset) - floor_log2_pow10(kb) - offset;
FMT_ASSERT(alpha > 0 && alpha < 64, "shifting error detected");
// Try to recover the real cache.
uint64_t pow5 = powers_of_5_64[offset];
uint128_wrapper recovered_cache = umul128(base_cache.high(), pow5);
uint128_wrapper middle_low =
umul128(base_cache.low() - (kb < 0 ? 1u : 0u), pow5);
recovered_cache += middle_low.high();
uint64_t high_to_middle = recovered_cache.high() << (64 - alpha);
uint64_t middle_to_low = recovered_cache.low() << (64 - alpha);
recovered_cache =
uint128_wrapper{(recovered_cache.low() >> alpha) | high_to_middle,
((middle_low.low() >> alpha) | middle_to_low)};
if (kb < 0) recovered_cache += 1;
// Get error.
int error_idx = (k - float_info<double>::min_k) / 16;
uint32_t error = (pow10_recovery_errors[error_idx] >>
((k - float_info<double>::min_k) % 16) * 2) &
0x3;
// Add the error back.
FMT_ASSERT(recovered_cache.low() + error >= recovered_cache.low(), "");
return {recovered_cache.high(), recovered_cache.low() + error};
#endif
}
static carrier_uint compute_mul(carrier_uint u,
const cache_entry_type& cache) FMT_NOEXCEPT {
return umul192_upper64(u, cache);
}
static uint32_t compute_delta(cache_entry_type const& cache,
int beta_minus_1) FMT_NOEXCEPT {
return static_cast<uint32_t>(cache.high() >> (64 - 1 - beta_minus_1));
}
static bool compute_mul_parity(carrier_uint two_f,
const cache_entry_type& cache,
int beta_minus_1) FMT_NOEXCEPT {
FMT_ASSERT(beta_minus_1 >= 1, "");
FMT_ASSERT(beta_minus_1 < 64, "");
return ((umul192_middle64(two_f, cache) >> (64 - beta_minus_1)) & 1) != 0;
}
static carrier_uint compute_left_endpoint_for_shorter_interval_case(
const cache_entry_type& cache, int beta_minus_1) FMT_NOEXCEPT {
return (cache.high() -
(cache.high() >> (float_info<double>::significand_bits + 2))) >>
(64 - float_info<double>::significand_bits - 1 - beta_minus_1);
}
static carrier_uint compute_right_endpoint_for_shorter_interval_case(
const cache_entry_type& cache, int beta_minus_1) FMT_NOEXCEPT {
return (cache.high() +
(cache.high() >> (float_info<double>::significand_bits + 1))) >>
(64 - float_info<double>::significand_bits - 1 - beta_minus_1);
}
static carrier_uint compute_round_up_for_shorter_interval_case(
const cache_entry_type& cache, int beta_minus_1) FMT_NOEXCEPT {
return ((cache.high() >>
(64 - float_info<double>::significand_bits - 2 - beta_minus_1)) +
1) /
2;
}
};
// Various integer checks
template <class T>
bool is_left_endpoint_integer_shorter_interval(int exponent) FMT_NOEXCEPT {
return exponent >=
float_info<
T>::case_shorter_interval_left_endpoint_lower_threshold &&
exponent <=
float_info<T>::case_shorter_interval_left_endpoint_upper_threshold;
}
template <class T>
bool is_endpoint_integer(typename float_info<T>::carrier_uint two_f,
int exponent, int minus_k) FMT_NOEXCEPT {
if (exponent < float_info<T>::case_fc_pm_half_lower_threshold) return false;
// For k >= 0.
if (exponent <= float_info<T>::case_fc_pm_half_upper_threshold) return true;
// For k < 0.
if (exponent > float_info<T>::divisibility_check_by_5_threshold) return false;
return divisible_by_power_of_5(two_f, minus_k);
}
template <class T>
bool is_center_integer(typename float_info<T>::carrier_uint two_f, int exponent,
int minus_k) FMT_NOEXCEPT {
// Exponent for 5 is negative.
if (exponent > float_info<T>::divisibility_check_by_5_threshold) return false;
if (exponent > float_info<T>::case_fc_upper_threshold)
return divisible_by_power_of_5(two_f, minus_k);
// Both exponents are nonnegative.
if (exponent >= float_info<T>::case_fc_lower_threshold) return true;
// Exponent for 2 is negative.
return divisible_by_power_of_2(two_f, minus_k - exponent + 1);
}
// Remove trailing zeros from n and return the number of zeros removed (float)
FMT_INLINE int remove_trailing_zeros(uint32_t& n) FMT_NOEXCEPT {
#ifdef FMT_BUILTIN_CTZ
int t = FMT_BUILTIN_CTZ(n);
#else
int t = ctz(n);
#endif
if (t > float_info<float>::max_trailing_zeros)
t = float_info<float>::max_trailing_zeros;
const uint32_t mod_inv1 = 0xcccccccd;
const uint32_t max_quotient1 = 0x33333333;
const uint32_t mod_inv2 = 0xc28f5c29;
const uint32_t max_quotient2 = 0x0a3d70a3;
int s = 0;
for (; s < t - 1; s += 2) {
if (n * mod_inv2 > max_quotient2) break;
n *= mod_inv2;
}
if (s < t && n * mod_inv1 <= max_quotient1) {
n *= mod_inv1;
++s;
}
n >>= s;
return s;
}
// Removes trailing zeros and returns the number of zeros removed (double)
FMT_INLINE int remove_trailing_zeros(uint64_t& n) FMT_NOEXCEPT {
#ifdef FMT_BUILTIN_CTZLL
int t = FMT_BUILTIN_CTZLL(n);
#else
int t = ctzll(n);
#endif
if (t > float_info<double>::max_trailing_zeros)
t = float_info<double>::max_trailing_zeros;
// Divide by 10^8 and reduce to 32-bits
// Since ret_value.significand <= (2^64 - 1) / 1000 < 10^17,
// both of the quotient and the r should fit in 32-bits
const uint32_t mod_inv1 = 0xcccccccd;
const uint32_t max_quotient1 = 0x33333333;
const uint64_t mod_inv8 = 0xc767074b22e90e21;
const uint64_t max_quotient8 = 0x00002af31dc46118;
// If the number is divisible by 1'0000'0000, work with the quotient
if (t >= 8) {
auto quotient_candidate = n * mod_inv8;
if (quotient_candidate <= max_quotient8) {
auto quotient = static_cast<uint32_t>(quotient_candidate >> 8);
int s = 8;
for (; s < t; ++s) {
if (quotient * mod_inv1 > max_quotient1) break;
quotient *= mod_inv1;
}
quotient >>= (s - 8);
n = quotient;
return s;
}
}
// Otherwise, work with the remainder
auto quotient = static_cast<uint32_t>(n / 100000000);
auto remainder = static_cast<uint32_t>(n - 100000000 * quotient);
if (t == 0 || remainder * mod_inv1 > max_quotient1) {
return 0;
}
remainder *= mod_inv1;
if (t == 1 || remainder * mod_inv1 > max_quotient1) {
n = (remainder >> 1) + quotient * 10000000ull;
return 1;
}
remainder *= mod_inv1;
if (t == 2 || remainder * mod_inv1 > max_quotient1) {
n = (remainder >> 2) + quotient * 1000000ull;
return 2;
}
remainder *= mod_inv1;
if (t == 3 || remainder * mod_inv1 > max_quotient1) {
n = (remainder >> 3) + quotient * 100000ull;
return 3;
}
remainder *= mod_inv1;
if (t == 4 || remainder * mod_inv1 > max_quotient1) {
n = (remainder >> 4) + quotient * 10000ull;
return 4;
}
remainder *= mod_inv1;
if (t == 5 || remainder * mod_inv1 > max_quotient1) {
n = (remainder >> 5) + quotient * 1000ull;
return 5;
}
remainder *= mod_inv1;
if (t == 6 || remainder * mod_inv1 > max_quotient1) {
n = (remainder >> 6) + quotient * 100ull;
return 6;
}
remainder *= mod_inv1;
n = (remainder >> 7) + quotient * 10ull;
return 7;
}
// The main algorithm for shorter interval case
template <class T>
FMT_INLINE decimal_fp<T> shorter_interval_case(int exponent) FMT_NOEXCEPT {
decimal_fp<T> ret_value;
// Compute k and beta
const int minus_k = floor_log10_pow2_minus_log10_4_over_3(exponent);
const int beta_minus_1 = exponent + floor_log2_pow10(-minus_k);
// Compute xi and zi
using cache_entry_type = typename cache_accessor<T>::cache_entry_type;
const cache_entry_type cache = cache_accessor<T>::get_cached_power(-minus_k);
auto xi = cache_accessor<T>::compute_left_endpoint_for_shorter_interval_case(
cache, beta_minus_1);
auto zi = cache_accessor<T>::compute_right_endpoint_for_shorter_interval_case(
cache, beta_minus_1);
// If the left endpoint is not an integer, increase it
if (!is_left_endpoint_integer_shorter_interval<T>(exponent)) ++xi;
// Try bigger divisor
ret_value.significand = zi / 10;
// If succeed, remove trailing zeros if necessary and return
if (ret_value.significand * 10 >= xi) {
ret_value.exponent = minus_k + 1;
ret_value.exponent += remove_trailing_zeros(ret_value.significand);
return ret_value;
}
// Otherwise, compute the round-up of y
ret_value.significand =
cache_accessor<T>::compute_round_up_for_shorter_interval_case(
cache, beta_minus_1);
ret_value.exponent = minus_k;
// When tie occurs, choose one of them according to the rule
if (exponent >= float_info<T>::shorter_interval_tie_lower_threshold &&
exponent <= float_info<T>::shorter_interval_tie_upper_threshold) {
ret_value.significand = ret_value.significand % 2 == 0
? ret_value.significand
: ret_value.significand - 1;
} else if (ret_value.significand < xi) {
++ret_value.significand;
}
return ret_value;
}
template <typename T> decimal_fp<T> to_decimal(T x) FMT_NOEXCEPT {
// Step 1: integer promotion & Schubfach multiplier calculation.
using carrier_uint = typename float_info<T>::carrier_uint;
using cache_entry_type = typename cache_accessor<T>::cache_entry_type;
auto br = bit_cast<carrier_uint>(x);
// Extract significand bits and exponent bits.
const carrier_uint significand_mask =
(static_cast<carrier_uint>(1) << float_info<T>::significand_bits) - 1;
carrier_uint significand = (br & significand_mask);
int exponent = static_cast<int>((br & exponent_mask<T>()) >>
float_info<T>::significand_bits);
if (exponent != 0) { // Check if normal.
exponent += float_info<T>::exponent_bias - float_info<T>::significand_bits;
// Shorter interval case; proceed like Schubfach.
if (significand == 0) return shorter_interval_case<T>(exponent);
significand |=
(static_cast<carrier_uint>(1) << float_info<T>::significand_bits);
} else {
// Subnormal case; the interval is always regular.
if (significand == 0) return {0, 0};
exponent = float_info<T>::min_exponent - float_info<T>::significand_bits;
}
const bool include_left_endpoint = (significand % 2 == 0);
const bool include_right_endpoint = include_left_endpoint;
// Compute k and beta.
const int minus_k = floor_log10_pow2(exponent) - float_info<T>::kappa;
const cache_entry_type cache = cache_accessor<T>::get_cached_power(-minus_k);
const int beta_minus_1 = exponent + floor_log2_pow10(-minus_k);
// Compute zi and deltai
// 10^kappa <= deltai < 10^(kappa + 1)
const uint32_t deltai = cache_accessor<T>::compute_delta(cache, beta_minus_1);
const carrier_uint two_fc = significand << 1;
const carrier_uint two_fr = two_fc | 1;
const carrier_uint zi =
cache_accessor<T>::compute_mul(two_fr << beta_minus_1, cache);
// Step 2: Try larger divisor; remove trailing zeros if necessary
// Using an upper bound on zi, we might be able to optimize the division
// better than the compiler; we are computing zi / big_divisor here
decimal_fp<T> ret_value;
ret_value.significand = divide_by_10_to_kappa_plus_1(zi);
uint32_t r = static_cast<uint32_t>(zi - float_info<T>::big_divisor *
ret_value.significand);
if (r > deltai) {
goto small_divisor_case_label;
} else if (r < deltai) {
// Exclude the right endpoint if necessary
if (r == 0 && !include_right_endpoint &&
is_endpoint_integer<T>(two_fr, exponent, minus_k)) {
--ret_value.significand;
r = float_info<T>::big_divisor;
goto small_divisor_case_label;
}
} else {
// r == deltai; compare fractional parts
// Check conditions in the order different from the paper
// to take advantage of short-circuiting
const carrier_uint two_fl = two_fc - 1;
if ((!include_left_endpoint ||
!is_endpoint_integer<T>(two_fl, exponent, minus_k)) &&
!cache_accessor<T>::compute_mul_parity(two_fl, cache, beta_minus_1)) {
goto small_divisor_case_label;
}
}
ret_value.exponent = minus_k + float_info<T>::kappa + 1;
// We may need to remove trailing zeros
ret_value.exponent += remove_trailing_zeros(ret_value.significand);
return ret_value;
// Step 3: Find the significand with the smaller divisor
small_divisor_case_label:
ret_value.significand *= 10;
ret_value.exponent = minus_k + float_info<T>::kappa;
const uint32_t mask = (1u << float_info<T>::kappa) - 1;
auto dist = r - (deltai / 2) + (float_info<T>::small_divisor / 2);
// Is dist divisible by 2^kappa?
if ((dist & mask) == 0) {
const bool approx_y_parity =
((dist ^ (float_info<T>::small_divisor / 2)) & 1) != 0;
dist >>= float_info<T>::kappa;
// Is dist divisible by 5^kappa?
if (check_divisibility_and_divide_by_pow5<float_info<T>::kappa>(dist)) {
ret_value.significand += dist;
// Check z^(f) >= epsilon^(f)
// We have either yi == zi - epsiloni or yi == (zi - epsiloni) - 1,
// where yi == zi - epsiloni if and only if z^(f) >= epsilon^(f)
// Since there are only 2 possibilities, we only need to care about the
// parity. Also, zi and r should have the same parity since the divisor
// is an even number
if (cache_accessor<T>::compute_mul_parity(two_fc, cache, beta_minus_1) !=
approx_y_parity) {
--ret_value.significand;
} else {
// If z^(f) >= epsilon^(f), we might have a tie
// when z^(f) == epsilon^(f), or equivalently, when y is an integer
if (is_center_integer<T>(two_fc, exponent, minus_k)) {
ret_value.significand = ret_value.significand % 2 == 0
? ret_value.significand
: ret_value.significand - 1;
}
}
}
// Is dist not divisible by 5^kappa?
else {
ret_value.significand += dist;
}
}
// Is dist not divisible by 2^kappa?
else {
// Since we know dist is small, we might be able to optimize the division
// better than the compiler; we are computing dist / small_divisor here
ret_value.significand +=
small_division_by_pow10<float_info<T>::kappa>(dist);
}
return ret_value;
}
} // namespace dragonbox
// Formats a floating-point number using a variation of the Fixed-Precision
// Positive Floating-Point Printout ((FPP)^2) algorithm by Steele & White:
// https://fmt.dev/papers/p372-steele.pdf.
FMT_CONSTEXPR20 inline void format_dragon(fp value, bool is_predecessor_closer,
int num_digits, buffer<char>& buf,
int& exp10) {
bigint numerator; // 2 * R in (FPP)^2.
bigint denominator; // 2 * S in (FPP)^2.
// lower and upper are differences between value and corresponding boundaries.
bigint lower; // (M^- in (FPP)^2).
bigint upper_store; // upper's value if different from lower.
bigint* upper = nullptr; // (M^+ in (FPP)^2).
// Shift numerator and denominator by an extra bit or two (if lower boundary
// is closer) to make lower and upper integers. This eliminates multiplication
// by 2 during later computations.
int shift = is_predecessor_closer ? 2 : 1;
uint64_t significand = value.f << shift;
if (value.e >= 0) {
numerator.assign(significand);
numerator <<= value.e;
lower.assign(1);
lower <<= value.e;
if (shift != 1) {
upper_store.assign(1);
upper_store <<= value.e + 1;
upper = &upper_store;
}
denominator.assign_pow10(exp10);
denominator <<= shift;
} else if (exp10 < 0) {
numerator.assign_pow10(-exp10);
lower.assign(numerator);
if (shift != 1) {
upper_store.assign(numerator);
upper_store <<= 1;
upper = &upper_store;
}
numerator *= significand;
denominator.assign(1);
denominator <<= shift - value.e;
} else {
numerator.assign(significand);
denominator.assign_pow10(exp10);
denominator <<= shift - value.e;
lower.assign(1);
if (shift != 1) {
upper_store.assign(1ULL << 1);
upper = &upper_store;
}
}
// Invariant: value == (numerator / denominator) * pow(10, exp10).
if (num_digits < 0) {
// Generate the shortest representation.
if (!upper) upper = &lower;
bool even = (value.f & 1) == 0;
num_digits = 0;
char* data = buf.data();
for (;;) {
int digit = numerator.divmod_assign(denominator);
bool low = compare(numerator, lower) - even < 0; // numerator <[=] lower.
// numerator + upper >[=] pow10:
bool high = add_compare(numerator, *upper, denominator) + even > 0;
data[num_digits++] = static_cast<char>('0' + digit);
if (low || high) {
if (!low) {
++data[num_digits - 1];
} else if (high) {
int result = add_compare(numerator, numerator, denominator);
// Round half to even.
if (result > 0 || (result == 0 && (digit % 2) != 0))
++data[num_digits - 1];
}
buf.try_resize(to_unsigned(num_digits));
exp10 -= num_digits - 1;
return;
}
numerator *= 10;
lower *= 10;
if (upper != &lower) *upper *= 10;
}
}
// Generate the given number of digits.
exp10 -= num_digits - 1;
if (num_digits == 0) {
denominator *= 10;
auto digit = add_compare(numerator, numerator, denominator) > 0 ? '1' : '0';
buf.push_back(digit);
return;
}
buf.try_resize(to_unsigned(num_digits));
for (int i = 0; i < num_digits - 1; ++i) {
int digit = numerator.divmod_assign(denominator);
buf[i] = static_cast<char>('0' + digit);
numerator *= 10;
}
int digit = numerator.divmod_assign(denominator);
auto result = add_compare(numerator, numerator, denominator);
if (result > 0 || (result == 0 && (digit % 2) != 0)) {
if (digit == 9) {
const auto overflow = '0' + 10;
buf[num_digits - 1] = overflow;
// Propagate the carry.
for (int i = num_digits - 1; i > 0 && buf[i] == overflow; --i) {
buf[i] = '0';
++buf[i - 1];
}
if (buf[0] == overflow) {
buf[0] = '1';
++exp10;
}
return;
}
++digit;
}
buf[num_digits - 1] = static_cast<char>('0' + digit);
}
template <typename Float>
FMT_HEADER_ONLY_CONSTEXPR20 int format_float(Float value, int precision,
float_specs specs,
buffer<char>& buf) {
// float is passed as double to reduce the number of instantiations.
static_assert(!std::is_same<Float, float>::value, "");
FMT_ASSERT(value >= 0, "value is negative");
const bool fixed = specs.format == float_format::fixed;
if (value <= 0) { // <= instead of == to silence a warning.
if (precision <= 0 || !fixed) {
buf.push_back('0');
return 0;
}
buf.try_resize(to_unsigned(precision));
fill_n(buf.data(), precision, '0');
return -precision;
}
if (specs.fallback) return snprintf_float(value, precision, specs, buf);
if (!is_constant_evaluated() && precision < 0) {
// Use Dragonbox for the shortest format.
if (specs.binary32) {
auto dec = dragonbox::to_decimal(static_cast<float>(value));
write<char>(buffer_appender<char>(buf), dec.significand);
return dec.exponent;
}
auto dec = dragonbox::to_decimal(static_cast<double>(value));
write<char>(buffer_appender<char>(buf), dec.significand);
return dec.exponent;
}
int exp = 0;
bool use_dragon = true;
if (is_fast_float<Float>()) {
// Use Grisu + Dragon4 for the given precision:
// https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf.
const int min_exp = -60; // alpha in Grisu.
int cached_exp10 = 0; // K in Grisu.
fp normalized = normalize(fp(value));
const auto cached_pow = get_cached_power(
min_exp - (normalized.e + fp::num_significand_bits), cached_exp10);
normalized = normalized * cached_pow;
gen_digits_handler handler{buf.data(), 0, precision, -cached_exp10, fixed};
if (grisu_gen_digits(normalized, 1, exp, handler) != digits::error &&
!is_constant_evaluated()) {
exp += handler.exp10;
buf.try_resize(to_unsigned(handler.size));
use_dragon = false;
} else {
exp += handler.size - cached_exp10 - 1;
precision = handler.precision;
}
}
if (use_dragon) {
auto f = fp();
bool is_predecessor_closer =
specs.binary32 ? f.assign(static_cast<float>(value)) : f.assign(value);
// Limit precision to the maximum possible number of significant digits in
// an IEEE754 double because we don't need to generate zeros.
const int max_double_digits = 767;
if (precision > max_double_digits) precision = max_double_digits;
format_dragon(f, is_predecessor_closer, precision, buf, exp);
}
if (!fixed && !specs.showpoint) {
// Remove trailing zeros.
auto num_digits = buf.size();
while (num_digits > 0 && buf[num_digits - 1] == '0') {
--num_digits;
++exp;
}
buf.try_resize(num_digits);
}
return exp;
}
template <typename T>
int snprintf_float(T value, int precision, float_specs specs,
buffer<char>& buf) {
// Buffer capacity must be non-zero, otherwise MSVC's vsnprintf_s will fail.
FMT_ASSERT(buf.capacity() > buf.size(), "empty buffer");
static_assert(!std::is_same<T, float>::value, "");
// Subtract 1 to account for the difference in precision since we use %e for
// both general and exponent format.
if (specs.format == float_format::general ||
specs.format == float_format::exp)
precision = (precision >= 0 ? precision : 6) - 1;
// Build the format string.
enum { max_format_size = 7 }; // The longest format is "%#.*Le".
char format[max_format_size];
char* format_ptr = format;
*format_ptr++ = '%';
if (specs.showpoint && specs.format == float_format::hex) *format_ptr++ = '#';
if (precision >= 0) {
*format_ptr++ = '.';
*format_ptr++ = '*';
}
if (std::is_same<T, long double>()) *format_ptr++ = 'L';
*format_ptr++ = specs.format != float_format::hex
? (specs.format == float_format::fixed ? 'f' : 'e')
: (specs.upper ? 'A' : 'a');
*format_ptr = '\0';
// Format using snprintf.
auto offset = buf.size();
for (;;) {
auto begin = buf.data() + offset;
auto capacity = buf.capacity() - offset;
#ifdef FMT_FUZZ
if (precision > 100000)
throw std::runtime_error(
"fuzz mode - avoid large allocation inside snprintf");
#endif
// Suppress the warning about a nonliteral format string.
// Cannot use auto because of a bug in MinGW (#1532).
int (*snprintf_ptr)(char*, size_t, const char*, ...) = FMT_SNPRINTF;
int result = precision >= 0
? snprintf_ptr(begin, capacity, format, precision, value)
: snprintf_ptr(begin, capacity, format, value);
if (result < 0) {
// The buffer will grow exponentially.
buf.try_reserve(buf.capacity() + 1);
continue;
}
auto size = to_unsigned(result);
// Size equal to capacity means that the last character was truncated.
if (size >= capacity) {
buf.try_reserve(size + offset + 1); // Add 1 for the terminating '\0'.
continue;
}
auto is_digit = [](char c) { return c >= '0' && c <= '9'; };
if (specs.format == float_format::fixed) {
if (precision == 0) {
buf.try_resize(size);
return 0;
}
// Find and remove the decimal point.
auto end = begin + size, p = end;
do {
--p;
} while (is_digit(*p));
int fraction_size = static_cast<int>(end - p - 1);
std::memmove(p, p + 1, to_unsigned(fraction_size));
buf.try_resize(size - 1);
return -fraction_size;
}
if (specs.format == float_format::hex) {
buf.try_resize(size + offset);
return 0;
}
// Find and parse the exponent.
auto end = begin + size, exp_pos = end;
do {
--exp_pos;
} while (*exp_pos != 'e');
char sign = exp_pos[1];
FMT_ASSERT(sign == '+' || sign == '-', "");
int exp = 0;
auto p = exp_pos + 2; // Skip 'e' and sign.
do {
FMT_ASSERT(is_digit(*p), "");
exp = exp * 10 + (*p++ - '0');
} while (p != end);
if (sign == '-') exp = -exp;
int fraction_size = 0;
if (exp_pos != begin + 1) {
// Remove trailing zeros.
auto fraction_end = exp_pos - 1;
while (*fraction_end == '0') --fraction_end;
// Move the fractional part left to get rid of the decimal point.
fraction_size = static_cast<int>(fraction_end - begin - 1);
std::memmove(begin + 1, begin + 2, to_unsigned(fraction_size));
}
buf.try_resize(to_unsigned(fraction_size) + offset + 1);
return exp - fraction_size;
}
}
} // namespace detail
template <> struct formatter<detail::bigint> {
FMT_CONSTEXPR format_parse_context::iterator parse(
format_parse_context& ctx) {
return ctx.begin();
}
format_context::iterator format(const detail::bigint& n,
format_context& ctx) {
auto out = ctx.out();
bool first = true;
for (auto i = n.bigits_.size(); i > 0; --i) {
auto value = n.bigits_[i - 1u];
if (first) {
out = format_to(out, FMT_STRING("{:x}"), value);
first = false;
continue;
}
out = format_to(out, FMT_STRING("{:08x}"), value);
}
if (n.exp_ > 0)
out = format_to(out, FMT_STRING("p{}"),
n.exp_ * detail::bigint::bigit_bits);
return out;
}
};
FMT_FUNC detail::utf8_to_utf16::utf8_to_utf16(string_view s) {
for_each_codepoint(s, [this](uint32_t cp, string_view) {
if (cp == invalid_code_point) FMT_THROW(std::runtime_error("invalid utf8"));
if (cp <= 0xFFFF) {
buffer_.push_back(static_cast<wchar_t>(cp));
} else {
cp -= 0x10000;
buffer_.push_back(static_cast<wchar_t>(0xD800 + (cp >> 10)));
buffer_.push_back(static_cast<wchar_t>(0xDC00 + (cp & 0x3FF)));
}
return true;
});
buffer_.push_back(0);
}
FMT_FUNC void format_system_error(detail::buffer<char>& out, int error_code,
const char* message) FMT_NOEXCEPT {
FMT_TRY {
auto ec = std::error_code(error_code, std::generic_category());
write(std::back_inserter(out), std::system_error(ec, message).what());
return;
}
FMT_CATCH(...) {}
format_error_code(out, error_code, message);
}
FMT_FUNC void report_system_error(int error_code,
const char* message) FMT_NOEXCEPT {
report_error(format_system_error, error_code, message);
}
// DEPRECATED!
// This function is defined here and not inline for ABI compatiblity.
FMT_FUNC void detail::error_handler::on_error(const char* message) {
throw_format_error(message);
}
FMT_FUNC std::string vformat(string_view fmt, format_args args) {
// Don't optimize the "{}" case to keep the binary size small and because it
// can be better optimized in fmt::format anyway.
auto buffer = memory_buffer();
detail::vformat_to(buffer, fmt, args);
return to_string(buffer);
}
#ifdef _WIN32
namespace detail {
using dword = conditional_t<sizeof(long) == 4, unsigned long, unsigned>;
extern "C" __declspec(dllimport) int __stdcall WriteConsoleW( //
void*, const void*, dword, dword*, void*);
} // namespace detail
#endif
namespace detail {
FMT_FUNC void print(std::FILE* f, string_view text) {
#ifdef _WIN32
auto fd = _fileno(f);
if (_isatty(fd)) {
detail::utf8_to_utf16 u16(string_view(text.data(), text.size()));
auto written = detail::dword();
if (detail::WriteConsoleW(reinterpret_cast<void*>(_get_osfhandle(fd)),
u16.c_str(), static_cast<uint32_t>(u16.size()),
&written, nullptr)) {
return;
}
// Fallback to fwrite on failure. It can happen if the output has been
// redirected to NUL.
}
#endif
detail::fwrite_fully(text.data(), 1, text.size(), f);
}
} // namespace detail
FMT_FUNC void vprint(std::FILE* f, string_view format_str, format_args args) {
memory_buffer buffer;
detail::vformat_to(buffer, format_str, args);
detail::print(f, {buffer.data(), buffer.size()});
}
#ifdef _WIN32
// Print assuming legacy (non-Unicode) encoding.
FMT_FUNC void detail::vprint_mojibake(std::FILE* f, string_view format_str,
format_args args) {
memory_buffer buffer;
detail::vformat_to(buffer, format_str,
basic_format_args<buffer_context<char>>(args));
fwrite_fully(buffer.data(), 1, buffer.size(), f);
}
#endif
FMT_FUNC void vprint(string_view format_str, format_args args) {
vprint(stdout, format_str, args);
}
FMT_END_NAMESPACE
#endif // FMT_FORMAT_INL_H_
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