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Clz builtin may be not constexpr #2762

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Feb 15, 2022
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Clz builtin may be not constexpr #2762

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2 changes: 1 addition & 1 deletion include/fmt/format.h
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Original file line number Diff line number Diff line change
Expand Up @@ -991,7 +991,7 @@ FMT_CONSTEXPR20 inline auto count_digits(uint64_t n) -> int {
template <int BITS, typename UInt>
FMT_CONSTEXPR auto count_digits(UInt n) -> int {
#ifdef FMT_BUILTIN_CLZ
if (num_bits<UInt>() == 32)
if (!is_constant_evaluated() && num_bits<UInt>() == 32)
return (FMT_BUILTIN_CLZ(static_cast<uint32_t>(n) | 1) ^ 31) / BITS + 1;
#endif
// Lambda avoids unreachable code warnings from NVHPC.
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