Niels Lohmann cf2af0396d Scan strings vector-first on x86-64 and avoid a stall when nesting ...

- With SSE2, string runs are checked 16 bytes at a time from their first
  byte: one compare finds the end of most keys and short values, faster on
  x86-64 than a branch per byte. AArch64 keeps the byte steps (there, a
  NEON mask costs more and the branches predict well; vector-first was 20%
  slower on Apple M1).
- open() stores the parent's frame field by field. Built on the stack and
  copied, it was read back by loads wider than its stores, which waited for
  them (store forwarding fails): 18% of the time on citm_catalog.json.

Parse on x86-64 (GCC 13 / Clang 18, us): twitter 352 -> 306 / 316 -> 288,
citm_catalog 1000 -> 770 / 843 -> 692, canada 1941 -> 1687 / 1978 -> 1722.
Unchanged on Apple M1.

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

2026-10-06 07:22:15 +02:00

..

builder.hpp

Scan strings vector-first on x86-64 and avoid a stall when nesting

2026-10-06 07:22:15 +02:00

compare.hpp

Address the cpplint findings of json_view's comparisons

2026-09-30 21:01:49 +02:00

document_data.hpp

Add images of json_documents: save() and load()

2026-09-30 21:02:13 +02:00

edit_storage.hpp

Cover the edit storage in tests

2026-09-30 21:02:06 +02:00

edit.hpp

Add insert() and erase() to editable documents

2026-09-30 21:02:09 +02:00

errors.hpp

Add editable documents with set() and push_back()

2026-09-30 21:02:03 +02:00

image.hpp

Address the cpplint findings of json_document images

2026-09-30 21:02:14 +02:00

input.hpp

Address the clang-tidy findings of json_document and json_view

2026-09-30 20:58:46 +02:00

iterator.hpp

Walk the index of json_view through a navigation policy

2026-09-30 21:02:02 +02:00

lookup.hpp

Walk the index of json_view through a navigation policy

2026-09-30 21:02:02 +02:00

macro_scope.hpp

Add json_document and json_view: parse, accept, types, materialize

2026-09-30 20:57:43 +02:00

macro_unscope.hpp

Validate non-ASCII strings with SSSE3 on every x86-64 CPU that has it

2026-10-05 20:16:24 +02:00

materialize.hpp

Mark an Infer false positive in materialize()

2026-10-02 11:44:12 +02:00

node.hpp

Address the clang-tidy findings of the editable documents

2026-09-30 21:02:04 +02:00

number.hpp

Add images of json_documents: save() and load()

2026-09-30 21:02:13 +02:00

object_index.hpp

Fix CI: useless casts of the key hash of the view's object index

2026-09-30 21:02:00 +02:00

pointer.hpp

Fix CI: useless cast in the array index check of the view's JSON pointers

2026-09-30 21:01:41 +02:00

scan.hpp

Scan strings vector-first on x86-64 and avoid a stall when nesting

2026-10-06 07:22:15 +02:00

serializer.hpp

Format the digits of numbers in vector registers and without reloads

2026-10-05 22:28:58 +02:00

simd.hpp

Validate non-ASCII strings with SSSE3 on every x86-64 CPU that has it

2026-10-05 20:16:24 +02:00

string_ref.hpp

Mark string_ref's strlen as a Flawfinder false positive

2026-10-01 10:26:18 +02:00

value.hpp

Convert the floats of json_view from the digit layout

2026-09-30 21:01:51 +02:00