As you've no doubt noticed in the docs, where icc supports similar syntax, the spelling is a little different, e.g. without " " in the argument. It seems like an obvious target for reconciliation, but I have no information on the plans.
Your reference indicates no support for gcc targets such as x86_64, which looks like a glaring omission.
I suppose you're aware of the way this was done in the past by icc:
http://software.intel.com/en-us/articles/how-to-manually-target-2nd-generation-intel-core-processors-with-support-for-intel-avx
