Author: Dann Corbit
Date: 14:46:32 01/19/05
Go up one level in this thread
On January 19, 2005 at 17:27:57, Aaron Gordon wrote: >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 > >Try using longs instead of ints. I have a DEC Alpha 21164 here (64bit also), and >wondered the same thing. Here is the output I got when running sizeof(). > >short = 2 (16 bits) >int = 4 (32 bits) >long = 8 (64 bits) >long long = 8 (64 bits) >float = 4 (32 bits) >double = 8 (64 bits) > >On my Athlon XP, as expected, I get: >short = 2 (16 bits) >int = 4 (32 bits) >long = 4 (32 bits) >long long = 8 (64 bits) >float = 4 (32 bits) >double = 8 (64 bits) Depends on the compiler you use too. A compiler vendor can use any type they want for int, as long as it will hold +/- 32767 or larger.
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