c++ - SSE 4.2: alternative to _mm_cmpistri -


i wrote program runs _mm_cmpistri next \n (newline) character. while works great on computer, fails on server due missing sse 4.2 support.

is there alternative using sse commands <= sse 4.1?

regards

ok, actual code is. hasn't been tested, it's give idea.

__m128i lf = _mm_set1_epi8('\n'); // unaligned part __m128i data = _mm_loadu_si128((__m128i *)ptr); int mask = _mm_movemask_epi8(_mm_cmpeq_epi8(data, lf)); if (mask != 0)     return ffs(mask); int index = 16 - ((size_t)ptr & 15); // aligned part, possibly overlaps unaligned part that's ok (; index < length; index += 16) {     data = _mm_load_si128((__m128i *)(ptr + index));     mask = _mm_movemask_epi8(_mm_cmpeq_epi8(data, lf));     if (mask != 0)         return index + ffs(mask); }

for msvc, ffs can defined in terms of _bitscanforward.


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