https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cvtsi128_si64&expand=5665,3337,227,6151,5589,1869 ``` __int64 _mm_cvtsi128_si64 (__m128i a) Synopsis __int64 _mm_cvtsi128_si64 (__m128i a) #include <emmintrin.h> Instruction: movq r64, xmm CPUID Flags: SSE2 Description Copy the lower 64-bit integer in a to dst. Operation dst[63:0] := a[63:0] Performance Architecture Latency Throughput (CPI) Skylake 1 0.33 Broadwell 1 0.33 Haswell 1 0.33 Ivy Bridge 1 0.33 ```