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Merge branch 'main' of https://github.com/fastfloat/fast_float

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HedgehogInTheCPP 2026-10-27 23:41:35 +03:00
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8
include/fast_float/decimal_to_binary.h
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@ -63,9 +63,15 @@ namespace detail {
* -ceil(p) + q * -ceil(p) + q
* where * where
* p = log(5**-q)/log(2) = -q * log(5)/log(2) * p = log(5**-q)/log(2) = -q * log(5)/log(2)
*
* The shift must floor towards negative infinity, as an arithmetic right
* shift does, but right-shifting a negative value is implementation-defined
* before C++20. Biasing the product by 2048 * 65536 keeps the shifted value
* non-negative without changing the result: the bias is a multiple of 2^16
* and is removed again after the shift.
*/ */
constexpr fastfloat_inline am_pow_t power(am_pow_t const q) noexcept { constexpr fastfloat_inline am_pow_t power(am_pow_t const q) noexcept {
return (((152170 + 65536) * q) >> 16) + 63; return (((152170 + 65536) * q + (2048 * 65536)) >> 16) - 2048 + 63;
} }
} // namespace detail } // namespace detail