1. Allow fallback to a lesser AVX support during make
Due to the fact that some distro restrict the compiule architecture
during make (while not setting any restrictions during configure) we
need to detect the target architecture also during make in order to
restrict the code we generate.
2. Add comments and better protect the arch specific code.
Identify all the vectorial functions used and clasify them according to
the neccesary hardware capabilities.
Use these requirements to protect the code for load and stores (the rest
of the code being automatically generated it is more difficult to
protect).
3. Correctly check for AVX* support.
Signed-off-by: George Bosilca <bosilca@icl.utk.edu>
fcf2766a03