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#include "fast_float/fast_float.h"
#include <cassert>
#include <cmath>
#include <cstdio>
#include <ios>
#include <iostream>
#include <limits>
#include <stdexcept>
#if defined(__CYGWIN__) || defined(__MINGW32__) || defined(__MINGW64__)
// Anything at all that is related to cygwin, msys and so forth will
// always use this fallback because we cannot rely on it behaving as normal
// gcc.
#include <locale>
#include <sstream>
// workaround for CYGWIN
double cygwin_strtod_l(char const *start, char **end) {
double d;
std::stringstream ss;
ss.imbue(std::locale::classic());
ss << start;
ss >> d;
if (ss.fail()) {
*end = nullptr;
}
if (ss.eof()) {
ss.clear();
}
auto nread = ss.tellg();
*end = const_cast<char *>(start) + nread;
return d;
}
float cygwin_strtof_l(char const *start, char **end) {
float d;
std::stringstream ss;
ss.imbue(std::locale::classic());
ss << start;
ss >> d;
if (ss.fail()) {
*end = nullptr;
}
if (ss.eof()) {
ss.clear();
}
auto nread = ss.tellg();
*end = const_cast<char *>(start) + nread;
return d;
}
#endif
template <typename T> char *to_string(T d, char *buffer) {
auto written = std::snprintf(buffer, 64, "%.*e",
std::numeric_limits<T>::max_digits10 - 1, d);
return buffer + written;
}
void strtof_from_string(char const *st, float &d) {
char *pr = (char *)st;
#if defined(__CYGWIN__) || defined(__MINGW32__) || defined(__MINGW64__) || \
defined(sun) || defined(__sun)
d = cygwin_strtof_l(st, &pr);
#elif defined(_WIN32)
static _locale_t c_locale = _create_locale(LC_ALL, "C");
d = _strtof_l(st, &pr, c_locale);
#else
static locale_t c_locale = newlocale(LC_ALL_MASK, "C", NULL);
d = strtof_l(st, &pr, c_locale);
#endif
if (pr == st) {
throw std::runtime_error("bug in strtod_from_string");
}
}
bool allvalues() {
char buffer[64];
for (uint64_t w = 0; w <= 0xFFFFFFFF; w++) {
float v;
if ((w % 1048576) == 0) {
std::cout << ".";
std::cout.flush();
}
uint32_t word = uint32_t(w);
memcpy(&v, &word, sizeof(v));
if (std::isfinite(v)) {
float nextf = std::nextafterf(v, INFINITY);
if (copysign(1, v) != copysign(1, nextf)) {
continue;
}
if (!std::isfinite(nextf)) {
continue;
}
double v1{v};
assert(float(v1) == v);
double v2{nextf};
assert(float(v2) == nextf);
double midv{v1 + (v2 - v1) / 2};
float expected_midv = float(midv);
char const *string_end = to_string(midv, buffer);
float str_answer;
strtof_from_string(buffer, str_answer);
float result_value;
auto result = fast_float::from_chars(buffer, string_end, result_value);
// Starting with version 4.0 for fast_float, we return result_out_of_range
// if the value is either too small (too close to zero) or too large
// (effectively infinity). So std::errc::result_out_of_range is normal for
// well-formed input strings.
if (result.ec != std::errc() &&
result.ec != std::errc::result_out_of_range) {
std::cerr << "parsing error ? " << buffer << std::endl;
return false;
}
if (std::isnan(v)) {
if (!std::isnan(result_value)) {
std::cerr << "not nan" << buffer << std::endl;
std::cerr << "v " << std::hexfloat << v << std::endl;
std::cerr << "v2 " << std::hexfloat << v2 << std::endl;
std::cerr << "midv " << std::hexfloat << midv << std::endl;
std::cerr << "expected_midv " << std::hexfloat << expected_midv
<< std::endl;
return false;
}
} else if (copysign(1, result_value) != copysign(1, v)) {
std::cerr << buffer << std::endl;
std::cerr << "v " << std::hexfloat << v << std::endl;
std::cerr << "v2 " << std::hexfloat << v2 << std::endl;
std::cerr << "midv " << std::hexfloat << midv << std::endl;
std::cerr << "expected_midv " << std::hexfloat << expected_midv
<< std::endl;
std::cerr << "I got " << std::hexfloat << result_value
<< " but I was expecting " << v << std::endl;
return false;
} else if (result_value != str_answer) {
std::cerr << "no match ? " << buffer << std::endl;
std::cerr << "v " << std::hexfloat << v << std::endl;
std::cerr << "v2 " << std::hexfloat << v2 << std::endl;
std::cerr << "midv " << std::hexfloat << midv << std::endl;
std::cerr << "expected_midv " << std::hexfloat << expected_midv
<< std::endl;
std::cout << "started with " << std::hexfloat << midv << std::endl;
std::cout << "round down to " << std::hexfloat << str_answer
<< std::endl;
std::cout << "got back " << std::hexfloat << result_value << std::endl;
std::cout << std::dec;
return false;
}
}
}
std::cout << std::endl;
return true;
}
inline void Assert(bool Assertion) {
#if defined(__CYGWIN__) || defined(__MINGW32__) || defined(__MINGW64__) || \
defined(sun) || defined(__sun)
if (!Assertion) {
std::cerr << "Omitting hard failure on msys/cygwin/sun systems.";
}
#else
if (!Assertion) {
throw std::runtime_error("bug");
}
#endif
}
int main() {
#if defined(__CYGWIN__) || defined(__MINGW32__) || defined(__MINGW64__) || \
defined(sun) || defined(__sun)
std::cout << "Warning: msys/cygwin or solaris detected. This particular test "
"is likely to generate false failures due to our reliance on "
"the underlying runtime library as a gold standard."
<< std::endl;
#endif
Assert(allvalues());
std::cout << std::endl;
std::cout << "all ok" << std::endl;
return EXIT_SUCCESS;
}
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