I don't know why there is even a debate about Intel not enabling certain features for AMD CPU's. Obviously there are reliability questions in doing so, and reliability is paramount.

You want to dispute that? Cyrex. End of discussion. They made Intel CPU clones and were the AMD of the early 90's, and you know what? Programs that ran on Intel CPUs would sometimes not work on Cyrex CPUs because not all x86 is created equal. Then, again in the 90's, AMD came out and they too had some stability issues that came about from not being exactly the same as Intel. The only company with an x86 license who I'm not aware of running into this issue is VIA, and I actually wouldn't be surprised if they had but I just didn't hear about it.

So that's twice in recent history that it has turned out other manufacturers were not up to snuff, yet some people think Intel must put their own rep (==money) on the line to claim that AMD is? It just doesn't make sense. Now if AMD offered money to Intel to fully pay to have the compiler tested then sure, I would say it is fair to force Intel to enable the optimizations because they do have such a large portion of the market, but failing that...