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json_view: accept() checks the text without writing an index (#5970)

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann authored and GitHub committed 2026-11-01 17:21:06 +01:00
1 parent 76001c6b4c
commit 1a018577cc
9 files changed
+500 -83
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include/nlohmann/detail/view/simd.hpp
+5 -2
View File
@@ -289,9 +289,12 @@ compares, and the UTF-8 check covers the bytes up to it. Returns where the
string scan stops, like scan_string_run: before ill-formed UTF-8 and for the
last bytes of the input, the bytes are checked one sequence at a time. Out of
line, so that no constants of the check occupy registers in the parse loop.
On x86-64, it is compiled for SSSE3 (see cpu_has_ssse3()).
On x86-64, it is compiled for SSSE3 (see cpu_has_ssse3()). Not cloned: with
the calls of accept()'s builder, GCC 16 would clone it without plain (always
string_plain()), and calling the clone made json_document::parse() run 0.7-1.2 %
more instructions.
*/
NLOHMANN_VIEW_SSSE3_TARGET NLOHMANN_VIEW_NOINLINE inline const unsigned char* scan_string_vector(const unsigned char* p, const unsigned char* e, const std::uint8_t* plain) noexcept
NLOHMANN_VIEW_SSSE3_TARGET NLOHMANN_VIEW_NOINLINE NLOHMANN_VIEW_NOCLONE inline const unsigned char* scan_string_vector(const unsigned char* p, const unsigned char* e, const std::uint8_t* plain) noexcept
{
using lookup = utf8_lookup4<>;
const unsigned char* block = p;