mirror of
https://github.com/nlohmann/json.git
synced 2026-10-06 06:30:31 +00:00
Niels Lohmann
44fba02ec2
- zmij::to_shortest() keeps the last digit apart from the 15 or 16 digits before it, and dtoa_impl::write_shortest() converts those at once: with SSE2 on x86-64 and NEON on 64-bit Arm (no CPU check needed), else eight digits at a time. The decimal point is inserted in the register; reading the digits back right after storing them stalled store forwarding. - json::dump() writes floats and integers straight into its write buffer instead of copying them from number_buffer, and integers below 10^16 eight digits at a time. - json_view's dump() writes doubles from their bits and tokens of up to 15 digits through the same code; its own NEON writer is removed. to_chars() on canada.json: 35 -> 29 ns per double (x86-64), 18.8 -> 14.2 ns (Apple M1); json::dump() of canada.json 16-29% faster, of citm_catalog.json 14-19%. Signed-off-by: Niels Lohmann <mail@nlohmann.me>