At 10:05 AM -0600 7/5/12, Scott Ribe wrote:
And theoretically, moving from 32-bit to 64-bit executable could
slow you down because of fewer pointers fitting in cache--however
the few people I've ever heard mention that were, in my opinion,
seriously overblowing it. In my experience with data & algorithm
heavy code, just switching from 32- to 64-bit produces about a 10%
performance boost, because of the advantages of x86-64 (more
registers and so on).
Now you may be getting to the crux of the matter:
For a processor family with reasonably clean 32- and 64-bit models
(i.e. PowerPC) going to 64-bit is a speed hit in many circumstances
due to the increase in size of everything.
However, i386 has so much baggage and so few registers that the
performance gain from x86-64's much less sucky architecture/runtime
more than makes up for the loss due to memory bloat.
;-)
-Steve
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