Use OSX terminal to find out the CPU instructions set (AVX, SSE and such)
Enter

sysctl -a | grep cpu.feat


get a list like

machdep.cpu.features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP MTRR PGE MCA CMOV PAT PSE36 CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT TM PBE SSE3 PCLMULQDQ DTES64 MON DSCPL VMX EST TM2 SSSE3 CX16 TPR PDCM SSE4.1 SSE4.2 x2APIC POPCNT AES PCID XSAVE OSXSAVE TSCTMR AVX1.0
machdep.cpu.feature_bits: 2286390173542120447


Alternatively (avoiding the grep and being a lot faster, which might help you run this often within a script)

sysctl machdep.cpu.features
sysctl machdep.cpu.features machdep.cpu.feature_bits


gives you just the list (or both) directly.

Or just use: sysctl machdep.cpu to get them all