On Feb 12, 2005, at 1:10 PM, Amaury Jacquot wrote:
64bit is generally slower than 32bit. The only benefit of 64bit is non-segmented addressing of several gigabytes of data. If you don't need that then 64 bit adressing is just overhead.
no it's not.
64 bit on a 32 bit processor is smaller because the processor only does 32 bits at a time.
OK, maybe I wasn't crystal clear; I referred to the 64 bit *addressing space*.
A "64bit operating system" *only* refers to the address space. The 64bit data register size is *already* available to applications under a "32 bit operating system" like Mac OS X today.
Therefore, applications that do not use the larger addressing space won't be any faster on a "64 bit operating system". If anything, it just means 2x the storage size for pointers, which will unnecessarily fill the processor cache and slow the app.
/Roine
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