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???
07/06/05 12:12
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 		 #96679 - Switch/Case Optimization
Responding to: ???'s previous message
I seem to remember that early versions of the Keil compiler didn't use jump tables for switch statements, this is probably why advice to avoid switch statements still persists.

This is unfortunate. Switch/case optimizations were added in version 3 which was released around 1990. This means that someone was making recommendations from the version 2 compiler which I doubt most current 8051 developers have ever used.

In fact, there are several ways to optimize a switch statement as shown in the following knowldgebase article: http://www.keil.com/support/docs/1316.htm

Jon

List of 54 messages in thread
TopicAuthorDate
code optimization            01/01/70 00:00      
   erm...            01/01/70 00:00      
   guidelines            01/01/70 00:00      
   Duh !!!!            01/01/70 00:00      
      yes its a link to learn optimization            01/01/70 00:00      
         the links provided            01/01/70 00:00      
            Really Wicked Optimisations!            01/01/70 00:00      
            counters in loops?            01/01/70 00:00      
               DJNZ            01/01/70 00:00      
                  ahh            01/01/70 00:00      
                  DOES it ?            01/01/70 00:00      
                     on Keil forum            01/01/70 00:00      
                     Yes!            01/01/70 00:00      
                     Of course it does...            01/01/70 00:00      
                        But...            01/01/70 00:00      
                           asking too much            01/01/70 00:00      
                              Not at all            01/01/70 00:00      
                           Maybe it does...            01/01/70 00:00      
                              Not when I tried it.            01/01/70 00:00      
                                 Lopp Rtation            01/01/70 00:00      
                        While you're there, Jon...            01/01/70 00:00      
                           how like a salt block?            01/01/70 00:00      
                              oh -- got it            01/01/70 00:00      
                           Overlaying and Scope            01/01/70 00:00      
                              Does it matter?            01/01/70 00:00      
                                 debugging            01/01/70 00:00      
   Previously on 8052.com            01/01/70 00:00      
      yes its in the board            01/01/70 00:00      
      IAR Article - Getting the Least            01/01/70 00:00      
   To be taken with a pinch of salt            01/01/70 00:00      
      more like a salt block            01/01/70 00:00      
      Re            01/01/70 00:00      
         switch            01/01/70 00:00      
            Switch/Case Optimization            01/01/70 00:00      
               Re: Switch/Case Optimization            01/01/70 00:00      
                  Look Why            01/01/70 00:00      
               Jon, I may have made a mistake            01/01/70 00:00      
         Big switches            01/01/70 00:00      
         Was?            01/01/70 00:00      
            Link to newer version            01/01/70 00:00      
               Hitex; Chris Hills            01/01/70 00:00      
                  Draft!            01/01/70 00:00      
   intermediate values in lookup tables            01/01/70 00:00      
      Generating lookup tables            01/01/70 00:00      
   a general statement on code optimization            01/01/70 00:00      
      Craft            01/01/70 00:00      
      Corrections            01/01/70 00:00      
         urban legends            01/01/70 00:00      
            Been there.            01/01/70 00:00      
               I think this is closer to the truth            01/01/70 00:00      
                  I just realize that the above            01/01/70 00:00      
               EE/CS            01/01/70 00:00      
            Micro-Optimisations - real-life example            01/01/70 00:00      
               manual optimization            01/01/70 00:00      

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