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Exclude fallback functions when FMT_BUILTIN_CLZ(LL) is not defined (#2434)

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brm
2021-07-25 19:37:18 +02:00
committed by GitHub
parent 5c222f0561
commit 0544a2279b
1 changed files with 4 additions and 0 deletions
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include/fmt/format.h
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@ -916,6 +916,7 @@ FMT_CONSTEXPR inline auto count_digits(uint128_t n) -> int {
} }
#endif #endif
#ifdef FMT_BUILTIN_CLZLL
// It is a separate function rather than a part of count_digits to workaround // It is a separate function rather than a part of count_digits to workaround
// the lack of static constexpr in constexpr functions. // the lack of static constexpr in constexpr functions.
inline auto do_count_digits(uint64_t n) -> int { inline auto do_count_digits(uint64_t n) -> int {
@ -934,6 +935,7 @@ inline auto do_count_digits(uint64_t n) -> int {
10000000000000000000ULL}; 10000000000000000000ULL};
return t - (n < zero_or_powers_of_10[t]); return t - (n < zero_or_powers_of_10[t]);
} }
#endif
// Returns the number of decimal digits in n. Leading zeros are not counted // Returns the number of decimal digits in n. Leading zeros are not counted
// except for n == 0 in which case count_digits returns 1. // except for n == 0 in which case count_digits returns 1.
@ -962,6 +964,7 @@ FMT_CONSTEXPR auto count_digits(UInt n) -> int {
template <> auto count_digits<4>(detail::fallback_uintptr n) -> int; template <> auto count_digits<4>(detail::fallback_uintptr n) -> int;
#ifdef FMT_BUILTIN_CLZ
// It is a separate function rather than a part of count_digits to workaround // It is a separate function rather than a part of count_digits to workaround
// the lack of static constexpr in constexpr functions. // the lack of static constexpr in constexpr functions.
FMT_INLINE auto do_count_digits(uint32_t n) -> int { FMT_INLINE auto do_count_digits(uint32_t n) -> int {
@ -984,6 +987,7 @@ FMT_INLINE auto do_count_digits(uint32_t n) -> int {
auto inc = table[FMT_BUILTIN_CLZ(n | 1) ^ 31]; auto inc = table[FMT_BUILTIN_CLZ(n | 1) ^ 31];
return static_cast<int>((n + inc) >> 32); return static_cast<int>((n + inc) >> 32);
} }
#endif
// Optional version of count_digits for better performance on 32-bit platforms. // Optional version of count_digits for better performance on 32-bit platforms.
FMT_CONSTEXPR20 inline auto count_digits(uint32_t n) -> int { FMT_CONSTEXPR20 inline auto count_digits(uint32_t n) -> int {