Author: Pham Minh Tri
Date: 19:40:50 10/30/00
I see that many programs (like GNU, Crafty) use the register keyword too many - for almost all integer valuables. This keyword indicates the CPU try to load a valuable into a register, if posible, and hope that program may run little quicker. However, in my view and in the PC machine, it is hopeless or harmful. The number of registers is very small, and the number of available ones is smaller, and the number of integer valuables at one time is usually several bigger than them. As a result, instead of doing something directly in the memory of a valuable, the CPU has to load it into a register to do this work then store it into memory for making the register be available for the next command. It turns out, many extra instructions of loading and storing will make program little slower. I know this difference is very small and almost can not be measured (and some compilers like Visual C ignore this keyword) so people could program without concerning about it. Pham
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.