Roine Gustafsson 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.
On x86-64 they did not only change from 32 bit to 64 bit, but they also doubled the number of general purpose and SSE registers. As a x86 has only a limited number of registers, the extra registers on x86-64 will make things faster.
Gert
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