Niels Lohmann 7c3888fe42 Write the scalar elements of a container without entering dump_internal() ...

Every element of an array or object went through dump_internal(), whose
frame holds the state for descending into a container (callee-saved
registers, indentation, depth). A scalar, which is what most elements
are, needs none of it, and paid for the entry and exit regardless.

The loops now call dump_scalar() directly for anything that is not an
object or an array, and dump_internal() for those only.

Apple M1, Apple clang, retired instructions per dump(), on top of the
previous change:
  small object 2997 -> 2712 (-10 %)   signed_ints 276M -> 252M (-9 %)
  floats 323M -> 301M (-7 %)          jeopardy 501M -> 462M (-8 %)
  citm_catalog 5.96M -> 5.61M (-6 %)  twitter 4.40M -> 4.12M (-6 %)
  canada 39.2M -> 37.0M (-5 %)

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

2026-10-22 09:28:13 +02:00

..

nlohmann

Write the scalar elements of a container without entering dump_internal()

2026-10-22 09:28:13 +02:00