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10.5: List 64-bit enabled GUI applications in 10.5
"It has nothing directly to do the with speed of the program" -> I don't think so, 64 bit do something for the speed of the program, but only with the apps wich are specifically developed for 64 bit. In fact, if you are working directly with 64 bit variables (on a 64 bit CPU) it's faster than working with 32 bit variables, only because the CPU can work with bigger numbers and for example for a database app it's far better for managing and using indexes.
10.5: List 64-bit enabled GUI applications in 10.5
On ppc it is hard to tell what is faster. For example loading a 64-bit register may take up to 4 instructions. Small immediate values (up to 25-bit I believe) don't take anymore due to sign extension. Also if your data structures in memory are 64-bit now instead of 32-bit you pay a cache and memory bandwidth penalty. |
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