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Improve __float128 support

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This commit is contained in:
Victor Zverovich
2022-03-19 09:33:40 -07:00
parent 71778e8b90
commit 3f9b7433a3
2 changed files with 13 additions and 6 deletions
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11
include/fmt/format.h
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@@ -1286,14 +1286,19 @@ template <typename T> struct decimal_fp {
template <typename T> FMT_API auto to_decimal(T x) noexcept -> decimal_fp<T>;
} // namespace dragonbox
// Returns true iff Float has the implicit bit which is not stored.
template <typename Float> constexpr bool has_implicit_bit() {
// An 80-bit FP number has a 64-bit significand an no implicit bit.
return std::numeric_limits<Float>::digits != 64;
}
// Returns the number of significand bits in Float excluding the implicit bit.
// Returns the number of significand bits stored in Float. The implicit bit is
// not counted since it is not stored.
template <typename Float> constexpr int num_significand_bits() {
return std::numeric_limits<Float>::digits -
(has_implicit_bit<Float>() ? 1 : 0);
// std::numeric_limits may not support __float128.
return is_float128<Float>() ? 112
: (std::numeric_limits<Float>::digits -
(has_implicit_bit<Float>() ? 1 : 0));
}
template <typename Float>