Niels Lohmann 7521d0436b Keep the target values of a diffed object of up to 16 members on the stack ...

diff_unequal() allocated a vector with the values in target of the members
of every object it diffed member by member. Objects with up to 16 members,
which are most of them, now use space in the stack frame, and larger ones
a vector as before. The storage is chosen once, when its size is reserved,
so that adding and reading a value needs no check of which one is in use.

diff() over the previous commit (instructions on macOS, Linux Ir GCC 13 / Clang
18): citm_catalog 21.5M -> 20.0M, 14.2M -> 13.5M / 14.2M -> 13.7M; twitter
12.0M -> 11.7M, 7.5M -> 7.3M / 7.5M -> 7.4M; canada 82.0M -> 81.5M.

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

2026-10-22 09:29:54 +02:00

..

nlohmann

Keep the target values of a diffed object of up to 16 members on the stack

2026-10-22 09:29:54 +02:00