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perf(builder): add LSX fast_needs_escaping for LoongArch (#2727)

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Use LSX intrinsics for the string-builder escape scan on LoongArch,
matching the existing find_next_json_quotable_character LSX path.

Fixes #2603
This commit is contained in:
吴杨帆
2026-05-19 05:13:43 +08:00
committed by GitHub
parent 8e2e9b8e02
commit 396ca141fd
1 changed files with 29 additions and 0 deletions
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include/simdjson/generic/builder/json_string_builder-inl.h
+29
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@@ -173,6 +173,35 @@ simdjson_inline bool fast_needs_escaping(std::string_view view) {
}
return _mm_movemask_epi8(running) != 0;
}
#elif SIMDJSON_EXPERIMENTAL_HAS_LSX
simdjson_inline bool fast_needs_escaping(std::string_view view) {
if (view.size() < 16) {
return simple_needs_escaping(view);
}
size_t i = 0;
__m128i running = __lsx_vreplgr2vr_b(0);
__m128i v34 = __lsx_vreplgr2vr_b(34);
__m128i v92 = __lsx_vreplgr2vr_b(92);
__m128i v32 = __lsx_vreplgr2vr_b(32);
for (; i + 15 < view.size(); i += 16) {
__m128i word =
__lsx_vld(reinterpret_cast<const char *>(view.data() + i), 0);
__m128i chunk = __lsx_vseq_b(word, v34);
chunk = __lsx_vor_v(chunk, __lsx_vseq_b(word, v92));
chunk = __lsx_vor_v(chunk, __lsx_vslt_bu(word, v32));
running = __lsx_vor_v(running, chunk);
}
if (i < view.size()) {
__m128i word = __lsx_vld(
reinterpret_cast<const char *>(view.data() + view.length() - 16), 0);
__m128i chunk = __lsx_vseq_b(word, v34);
chunk = __lsx_vor_v(chunk, __lsx_vseq_b(word, v92));
chunk = __lsx_vor_v(chunk, __lsx_vslt_bu(word, v32));
running = __lsx_vor_v(running, chunk);
}
return !__lsx_bz_v(running);
}
#elif SIMDJSON_EXPERIMENTAL_HAS_PPC64
simdjson_inline bool fast_needs_escaping(std::string_view view) {
if (view.size() < 16) {