[Numpy-discussion] Simplifying compiler optimization flags logic (fortran compilers)

Hi, I was wondering whether it was really worth having a lot of magic going on in fcompilers for flags like -msse2 and co (everything done in get_flags_arch, for example). It is quite fragile (we had several problems wrt buggy compilers, buggy CPU detection), and I am not sure it buys us much anyway. Did some people notice a difference between gfortran -O3 -msse2 and gfortran -O3 ? thanks, David