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Remove the eight-digit case of the view's digit parser

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Since whole blocks of eight digits are read directly, parse_upto8() only
gets fewer than eight digits; its eight-digit case was dead code.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-29 09:52:19 +02:00
parent 58ac756134
commit a49d6e2e3b
1 changed files with 3 additions and 6 deletions
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9
include/nlohmann/detail/view/scan.hpp
View File

@@ -147,16 +147,13 @@ inline std::uint64_t int_pow10(unsigned k) noexcept
return table[k];
}
/// value of k <= 8 digits at p in one step if [p, p + 8) lies below limit,
/// else one digit at a time
/// value of 0 < k < 8 digits at p in one step if [p, p + 8) lies below
/// limit, else one digit at a time (whole blocks of eight digits are read by
/// parse_upto19() directly)
NLOHMANN_VIEW_ALWAYS_INLINE std::uint64_t parse_upto8(const unsigned char* p, unsigned k, const unsigned char* limit) noexcept
{
if (NLOHMANN_VIEW_LIKELY(limit - p >= 8))
{
if (k == 8)
{
return parse_eight_digits(read_eight_bytes(p));
}
// move the k digits to the top and pad the vacated low bytes with '0'
const unsigned shift = 8 * (8 - k);
return parse_eight_digits((read_eight_bytes(p) << shift) | (0x3030303030303030u >> (8 * k)));