Gus Correa wrote:
On Opteron Shanghai the Intel 10.1 compilers seem to reject any architecture-dependent optimization flag above -xW (SSE and SSE2), although the processor has SSE3, etc, and would qualify for higher levels of optimization, or not? Is this deliberate?
Intel builds compilers that generate reasonable performing code on Intel processors. I think they also generate (or at least they did in the past) a slower path for more generic processors. AMDs are in this mix.
Our experience with recent gcc suggests it is pretty good relative to icc/pgcc. Gfortran isn't bad, but we find it easier to build F90 code with ifort/pgf90 than gfortran. I haven't used g95 much, don't have as much of an opinion as to ease of portability.
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