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Allow bit_cast to work for 80bit long double #4246

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Nov 29, 2024
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Allow bit_cast to work for 80bit long double #4246

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8 changes: 4 additions & 4 deletions include/fmt/format.h
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Original file line number Diff line number Diff line change
Expand Up @@ -419,17 +419,17 @@ template <> constexpr auto num_bits<uint128_fallback>() -> int { return 128; }
// and 128-bit pointers to uint128_fallback.
template <typename To, typename From, FMT_ENABLE_IF(sizeof(To) > sizeof(From))>
inline auto bit_cast(const From& from) -> To {
constexpr auto size = static_cast<int>(sizeof(From) / sizeof(unsigned));
constexpr auto size = static_cast<int>(sizeof(From) / sizeof(unsigned short));
struct data_t {
unsigned value[static_cast<unsigned>(size)];
unsigned short value[static_cast<unsigned>(size)];
} data = bit_cast<data_t>(from);
auto result = To();
if (const_check(is_big_endian())) {
for (int i = 0; i < size; ++i)
result = (result << num_bits<unsigned>()) | data.value[i];
result = (result << num_bits<unsigned short>()) | data.value[i];
} else {
for (int i = size - 1; i >= 0; --i)
result = (result << num_bits<unsigned>()) | data.value[i];
result = (result << num_bits<unsigned short>()) | data.value[i];
}
return result;
}
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