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_cmpeq_epi64(__m128i a, __m128i b)
Performs a packed integer 64-bit comparison for equality. The intrinsic fills the corresponding parts of the result with zeroes or ones based on equality.
Corresponding instruction: PCMPEQQ