Linked by Tony Bourke on Thu 22nd Jan 2004 21:29 UTC
Benchmarks When running tests, installing operating systems, and compiling software for my Ultra 5, I came to the stunning realization that hey, this system is 64-bit, and all of the operating systems I installed on this Ultra 5 (can) run in 64-bit mode.
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While we're adding stuff! :)
by Dawnrider on Thu 22nd Jan 2004 22:05 UTC

This set of benchmarks is actually very nice, since it compares pure 32bit code on a system without too many differences between 64bit and 32bit implementations.

On x86-64, however, recompiling to 64bit also gives the compiler access to additional registers, so it doesn't have to waste cycles re-arranging contents in the limited number of x86 registers. This offers a performance boost beyond simple recompilation and excluding the benefits of 64bits on operations which need it.

Therefore, readers considering Opterons and Athlon64s should be aware that the figures here do not represent the results they would discover from 64bit recompilation. ;)