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Limit Dragonbox to supported FP formats

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This commit is contained in:
Victor Zverovich 2022-02-19 07:14:18 -08:00
parent 7b96420961
commit af5d8004fc
1 changed files with 8 additions and 10 deletions
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18
include/fmt/format-inl.h
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@ -2208,7 +2208,13 @@ FMT_HEADER_ONLY_CONSTEXPR20 int format_float(Float value, int precision,
if (specs.fallback) return snprintf_float(value, precision, specs, buf);
if (!is_constant_evaluated() && precision < 0) {
int exp = 0;
bool use_dragon = true;
if (!is_fast_float<Float>()) {
// Use floor because 0.9 = 9e-1.
exp = static_cast<int>(std::floor(std::log10(value)));
if (fixed) adjust_precision(precision, exp + 1);
} else if (!is_constant_evaluated() && precision < 0) {
// Use Dragonbox for the shortest format.
if (specs.binary32) {
auto dec = dragonbox::to_decimal(static_cast<float>(value));
@ -2218,11 +2224,7 @@ FMT_HEADER_ONLY_CONSTEXPR20 int format_float(Float value, int precision,
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>()) {
} else {
// 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.
@ -2241,10 +2243,6 @@ FMT_HEADER_ONLY_CONSTEXPR20 int format_float(Float value, int precision,
exp += handler.size - cached_exp10 - 1;
precision = handler.precision;
}
} else {
// Use floor because 0.9 = 9e-1.
exp = static_cast<int>(std::floor(std::log10(value)));
if (fixed) adjust_precision(precision, exp + 1);
}
if (use_dragon) {
auto f = fp();