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Workaround intel bug

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Potential workaround / restructure for the intel bug that is the cause of #3645.

Make the variable in the external struct instead an embedded static constexpr variable in the only function that uses the variable.
This commit is contained in:
Greg Sjaardema 2023-09-20 08:56:07 -06:00 committed by GitHub
parent a3a74fa7f3
commit bbaac96651
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1 changed files with 15 additions and 22 deletions
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37
include/fmt/format.h
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@ -1740,28 +1740,6 @@ FMT_CONSTEXPR inline fp operator*(fp x, fp y) {
return {multiply(x.f, y.f), x.e + y.e + 64};
}
template <typename T = void> struct basic_data {
// For checking rounding thresholds.
// The kth entry is chosen to be the smallest integer such that the
// upper 32-bits of 10^(k+1) times it is strictly bigger than 5 * 10^k.
static constexpr uint32_t fractional_part_rounding_thresholds[8] = {
2576980378U, // ceil(2^31 + 2^32/10^1)
2190433321U, // ceil(2^31 + 2^32/10^2)
2151778616U, // ceil(2^31 + 2^32/10^3)
2147913145U, // ceil(2^31 + 2^32/10^4)
2147526598U, // ceil(2^31 + 2^32/10^5)
2147487943U, // ceil(2^31 + 2^32/10^6)
2147484078U, // ceil(2^31 + 2^32/10^7)
2147483691U // ceil(2^31 + 2^32/10^8)
};
};
// This is a struct rather than an alias to avoid shadowing warnings in gcc.
struct data : basic_data<> {};
#if FMT_CPLUSPLUS < 201703L
template <typename T>
constexpr uint32_t basic_data<T>::fractional_part_rounding_thresholds[];
#endif
template <typename T, bool doublish = num_bits<T>() == num_bits<double>()>
using convert_float_result =
@ -3283,6 +3261,21 @@ FMT_CONSTEXPR20 void format_hexfloat(Float value, int precision,
template <typename Float>
FMT_CONSTEXPR20 auto format_float(Float value, int precision, float_specs specs,
buffer<char>& buf) -> int {
// For checking rounding thresholds.
// The kth entry is chosen to be the smallest integer such that the
// upper 32-bits of 10^(k+1) times it is strictly bigger than 5 * 10^k.
static constexpr uint32_t fractional_part_rounding_thresholds[8] = {
2576980378U, // ceil(2^31 + 2^32/10^1)
2190433321U, // ceil(2^31 + 2^32/10^2)
2151778616U, // ceil(2^31 + 2^32/10^3)
2147913145U, // ceil(2^31 + 2^32/10^4)
2147526598U, // ceil(2^31 + 2^32/10^5)
2147487943U, // ceil(2^31 + 2^32/10^6)
2147484078U, // ceil(2^31 + 2^32/10^7)
2147483691U // ceil(2^31 + 2^32/10^8)
};
// float is passed as double to reduce the number of instantiations.
static_assert(!std::is_same<Float, float>::value, "");
FMT_ASSERT(value >= 0, "value is negative");