diff options
Diffstat (limited to 'src/corelib/serialization/qjson_p.h')
| -rw-r--r-- | src/corelib/serialization/qjson_p.h | 32 |
1 files changed, 7 insertions, 25 deletions
diff --git a/src/corelib/serialization/qjson_p.h b/src/corelib/serialization/qjson_p.h index dc56a49084..feba1faac6 100644 --- a/src/corelib/serialization/qjson_p.h +++ b/src/corelib/serialization/qjson_p.h @@ -69,6 +69,9 @@ QT_BEGIN_NAMESPACE +// in qstring.cpp +void qt_to_latin1_unchecked(uchar *dst, const ushort *uc, qsizetype len); + /* This defines a binary data structure for Json data. The data structure is optimised for fast reading and minimum allocations. The whole data structure can be mmap'ed and used directly. @@ -294,31 +297,10 @@ public: int len = d->length = str.length(); uchar *l = (uchar *)d->latin1; const ushort *uc = (const ushort *)str.unicode(); - int i = 0; -#ifdef __SSE2__ - for ( ; i + 16 <= len; i += 16) { - __m128i chunk1 = _mm_loadu_si128((__m128i*)&uc[i]); // load - __m128i chunk2 = _mm_loadu_si128((__m128i*)&uc[i + 8]); // load - // pack the two vector to 16 x 8bits elements - const __m128i result = _mm_packus_epi16(chunk1, chunk2); - _mm_storeu_si128((__m128i*)&l[i], result); // store - } -# ifdef Q_PROCESSOR_X86_64 - // we can do one more round, of 8 characters - if (i + 8 <= len) { - __m128i chunk = _mm_loadu_si128((__m128i*)&uc[i]); // load - // pack with itself, we'll discard the high part anyway - chunk = _mm_packus_epi16(chunk, chunk); - // unaligned 64-bit store - qToUnaligned(_mm_cvtsi128_si64(chunk), l + i); - i += 8; - } -# endif -#endif - for ( ; i < len; ++i) - l[i] = uc[i]; - for ( ; (quintptr)(l+i) & 0x3; ++i) - l[i] = 0; + qt_to_latin1_unchecked(l, uc, len); + + for ( ; (quintptr)(l+len) & 0x3; ++len) + l[len] = 0; return *this; } |