Intel® C++ Compiler XE 13.1 User and Reference Guides
The prototype for this Intel® Streaming SIMD Extensions (Intel® SSE4) intrinsic is in the smmintrin.h file.
__m128i _mm_packus_epi32(__m128i m1, __m128i m2);
Converts eight packed signed doublewords into eight packed unsigned words, using unsigned saturation to handle overflow condition.
Corresponding instruction: PACKUSDW