Intel is under no obligation whatsoever to support AMD, much less produce optimal code for it. That takes effort and intimate knowledge about the caveats and errata on AMD cpus. AMD isn't willing to share that, nor support financially the development.
If you don't like Intel's compiler ( which has something like 4% market share ) , you're free to use from a plethora of others : MS, Pathscale, GCC, Sun Studio,etc.
The whole compiler thing is BS stemming from the socio-political views of those in power, liberal neo-socialists ) both US/EU, who have grand ideas of benevolence from the strong to the weak and if they don't do it willfully they will be forced. Horse manure.
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