From the slowest/weakest to the fastest/strongest version :
- orion64-v0.8.exe             : slowest and weakest version
- orion64-v0.8-pop.exe         : slow and weak version
- orion64-v0.8-pop-avx.exe     : fast and strong version
- orion64-v0.8-pop-avx-fma.exe : fastest and strongest version

Each version requires support of some (sets of) instructions :
- orion64-v0.8.exe             : 64-bit processor
- orion64-v0.8-pop.exe         : 64-bit processor + 'popcount' instruction
- orion64-v0.8-pop-avx.exe     : 64-bit processor + 'popcount' instruction + 'avx' set of instructions
- orion64-v0.8-pop-avx-fma.exe : 64-bit processor + 'popcount' instruction + 'avx' and 'fma' sets of instructions
