[Bug middle-end/49363] New: [feature request] multiple target attribute (and runtime dispatching based on cpuid)

["vincenzo.innocente at cern dot ch" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49363

           Summary: [feature request] multiple target attribute (and
                    runtime dispatching based on cpuid)
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: vincenzo.innocente@cern.ch


let me come back to the issue of supporting runtime dispatching based on cpuid
at compiler time:
would it be possible to implement a runtime dispatching based on a comma
separated list of targets. for instance something like
 ret_type __attribute__ ((__target__ ("sse2,"avx","fma"))) func(...) { ...}
?
I think many developers are by now using macros, templates and other "magic" to
implement their own dispatching schema. Support from the compiler would be more
than welcome!