Author: Robert Hyatt
Date: 10:23:50 01/19/05
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On January 19, 2005 at 11:55:43, Rémi Coulom wrote: >Hi, > >I am porting my chess program to 64 bit on an AMD64 Athlon processor. I have >noticed that, with gcc, sizeof(int)=4. I would have expected sizeof(int)=8. On >32-bit platforms, 32-bit variables are faster than 16-bit variables. I wonder if >64-bit variables are faster than 32-bit variables on 64-bit machines. I have >made a few experiments and did not notice much difference. > >Rémi You aren't running a 64 bit gcc then. And most likely are not running a 64 bit operating system which is necessary before you can use a 64 bit compiler... Not much difference in speed, unless you _need_ 64 bit values. Then having to do 2x32 on a 32 bit machine is slower than one 64 bit operation on the opteron.
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