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commit e2411f566346aa4f07be4efd76391e5952866760 Author: Nick Vatamaniuc <[email protected]> AuthorDate: Fri Jun 12 20:11:14 2026 -0400 Update ffc.h : faster numbers parsing A quick microbench showed 10% speedup on numbers.json. Upstream PR: https://github.com/kolemannix/ffc.h/pull/23 --- c_src/ffc.h | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/c_src/ffc.h b/c_src/ffc.h index 056b6f9..3a1e20a 100644 --- a/c_src/ffc.h +++ b/c_src/ffc.h @@ -114,8 +114,8 @@ extern "C" { #define FFC_API #define FFC_VERSION_YEAR 26 -#define FFC_VERSION_MONTH 03 -#define FFC_VERSION_BUILD 03 +#define FFC_VERSION_MONTH 04 +#define FFC_VERSION_BUILD 01 #define FFC_VERSION ((FFC_VERSION_YEAR << 16) | (FFC_VERSION_MONTH << 8) | (FFC_VERSION_BUILD)) #define FFC_VERSION_STRINGIFY_(x) #x #define FFC_VERSION_STRINGIFY(x) FFC_VERSION_STRINGIFY_(x) @@ -1125,13 +1125,22 @@ ffc_internal ffc_inline void ffc_loop_parse_if_eight_digits(char const **p, char const *const pend, uint64_t* i) { // optimizes better than parse_if_eight_digits_unrolled() for char. - while ((pend - *p >= 8) && - ffc_is_made_of_eight_digits_fast(ffc_read8_to_u64(*p))) { - *i = (*i * 100000000) + - ffc_parse_eight_digits_unrolled_swar(ffc_read8_to_u64(*p)); + while (pend - *p >= 8) { + uint64_t val = ffc_read8_to_u64(*p); + if (!ffc_is_made_of_eight_digits_fast(val)) { break; } + *i = (*i * 100000000) + ffc_parse_eight_digits_unrolled_swar(val); // in rare cases, this will overflow, but that's ok *p += 8; } + // 4-digit follow-up: handles sub-8 remainders (e.g. 7-digit fractions) + // without falling all the way to byte-by-byte for the first 4 digits. + if (pend - *p >= 4) { + uint32_t val4 = ffc_read4_to_u32(*p); + if (ffc_is_made_of_four_digits_fast(val4)) { + *i = (*i * 10000) + ffc_parse_four_digits_unrolled(val4); + *p += 4; + } + } } /* section end: read digits */
