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Well they've already done that implementing new co-procressor instructions in the various X-Scale cores, including MMX like instructions and a graphics accelarator in the latest PXA270. In the PDA market theses are only used by manufacturer driver writers (if even that), the extensions tend not to be used by application developers given Microsoft's stoneage development enviroment that doesn't even properly optimise for the StrongARM ARMv4, never mind X-Scale's ARMv5. But that does tend to favour the ARM9 which at only 266MHz matches a 400MHz PXA255 on almost every benchmark.

 is a RISC OS Userdruck on 25/8/05 10:43AM
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