Niels Lohmann 788b12213b accept(): skip digits without computing their value ...

accept() needs the value of a number only for a float whose exponent may
reach the largest value. skip_digits() finds the end of the digits without
the multiply-adds of accumulate_digits(), and once an 8-byte word fails the
digit test, the remaining loop needs no bounds check: a non-digit is in
that word. The value is computed afterwards for the rare floats that need
it.

accept() of canada.json: -16 % on Apple M1, -22 % with GCC 15 and -21 %
with Clang 21 on x86-64; files with many numbers -9 to -15 %.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

2026-11-06 12:16:38 +01:00

..

nlohmann

accept(): skip digits without computing their value

2026-11-06 12:16:38 +01:00