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  • Author Author: mlease
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C switch statements

mlease

This week I covered several approaches to make large switch statements execute faster and save power. Switch statements are a great way to help keep your code readable but it is easy to forget they can turn into a long sequence of if-then-else statements.

 

http://cmicrotek.com/wordpress_159256135/?p=156

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  • @Mike,

     

    Do you have any measured data to show the benefits of your design suggestions in terms of power reduction ?

     

    My approach would be to write code which most clearly expresses (in my case in C, VHDL or Verilog) intent and in the first instance to let the tools do the optimisation. So if I was desperate to optimise power consumption I would start with a nice clear case statement (assuming that was the obvious way to code, using an enumerated type for the switch variable for safety and clarity). Then I would want to measure any benefit from changing from the best compiler optimisation to "power crafted" code.

     

    MK

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  • @Mike,

     

    Do you have any measured data to show the benefits of your design suggestions in terms of power reduction ?

     

    My approach would be to write code which most clearly expresses (in my case in C, VHDL or Verilog) intent and in the first instance to let the tools do the optimisation. So if I was desperate to optimise power consumption I would start with a nice clear case statement (assuming that was the obvious way to code, using an enumerated type for the switch variable for safety and clarity). Then I would want to measure any benefit from changing from the best compiler optimisation to "power crafted" code.

     

    MK

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