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Programming Talk / C++ / C# - Should I use bit shifting to divide/multiply powers of 2?

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prasoc
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Posted: 27th Jul 2009 23:54
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Will it save so many cycles that it actually makes a difference, for example if I do this



instead of dividing by 2 every frame? And what about if I change like 10 divides and 10 multiplications to bit shifts every frame, how much will that improve performance?


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Diggsey
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Posted: 28th Jul 2009 02:47
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In DBPro, the difference will be almost non-existant. You should concentrate on optimizing the bottle-necks of the code, not things like that which will not be noticeable.


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Benjamin
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Posted: 28th Jul 2009 08:35
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And if you're using C++ the compiler will most likely do the optimization for you anyway, providing you have it enabled.

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Homey the Clown
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Posted: 29th Sep 2009 09:39
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technically it could be faster because that is pretty much a direct assembly language translation(shr or shl). but today's compilers are so optimized, it really wont make a noticeable difference.


If at first you dont succeed, call it version 1.0.
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