Developer Guide and Reference


Packed Compare for Equal Intrinsic

The prototype for this Intel® Streaming SIMD Extensions (Intel® SSE4) intrinsic is in the
To use this intrinsic, include the
file as follows:
#include <immintrin.h>


__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:

Product and Performance Information


Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804