endian little unaligned ok wordsize 64 family x86 amd64 x86-64 em64t x64 k8 barcelona atom nocona core2 corei7 sandybridge ivybridge core2duo -> core2 intelcore2 -> core2 intelcore2duo -> core2 nehalem -> corei7 westmere -> corei7 sledgehammer -> k8 opteron -> k8 amdopteron -> k8 athlon64 -> k8 sse2 ssse3 sse4.1 sse4.2 avx2 aesni rdrand rdseed sha bmi2 sha