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__m128i prod = _mm_unpacklo_epi64(prod01, prod23); // (ab3,ab2,ab1,ab0)
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Code sample was taken from this StackOverflow thread: [https://stackoverflow.com/questions/17264399/fastest-way-to-multiply-two-vectors-of-32bit-integers-in-c-with-sse Fastest way to multiply two vectors of 32bit integers in C++, with SSE]
Here is a link to an interactive guide to Intel Intrinsics: [https://software.intel.com/sites/landingpage/IntrinsicsGuide/#techs=SSE,SSE2,SSE3,SSSE3,SSE4_1,SSE4_2 Intel Intrinsics SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2]
