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{ __m128i m1 = *( __m128i* )( s1 ); __m128i m2 = *( __m128i* )( s2 ); __m128i r1 = not( _mm_cmpeq_epi8( m1, m2 ) ); __m128i zero = { 0 }; __m128i r2 = _mm_cmpeq_epi8( m1, zero ); __m128i r3 = _mm_cmpeq_epi8( m2, zero ); __m128i r = _mm_or_si128( r1, _mm_or_si128( r2, r3 ) ); mask = _mm_movemask_epi8( r ); if ( mask ) { unsigned index = __builtin_ffs( mask ) - 1; return ( s1[ index ] - s2[ index ] ); } }
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