But I think nunfetishists point was that if you become *dependant* on non-standard extensions then if Intel change or drop these (or simply lose interest in the ARM) you could be left in a bind.
As to ARM610/710 yes *ARM* have added extensions since (such as the VFP instructions on ARM10, CLZ and other odds and ends bits and pieces). Point is ARM define the standard and *all* ARM licensees can use the extensions. With MMX that's an Intel creation and whether it *could* be used by other ARM licensees might be an issue.
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