Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
02/16/07 09:23
Read: times


 		 #133112 - Thanks. Also interesting.
Responding to: ???'s previous message
Save This Code
;while(--somechar != 0);
	dec	_somechar
	mov	a,_somechar
	jz	00108$
	sjmp	00101$


Wow. Looks like SDCC doesn't use the DJNZ instruction at all (or at least doesn't recognize an obvious place to use it).

Well, every compiler has its quirks, and some are downright lousy. I've tried the Accutron C compiler (comes with Analog Devices eval kits), and it honestly saves each and every register when entering a function, regardless of which are actually used.

List of 68 messages in thread
TopicAuthorDate
Speed Recommendation            01/01/70 00:00      
   Time for processing            01/01/70 00:00      
   Get a 1X Chip            01/01/70 00:00      
      another 485 issue            01/01/70 00:00      
         slightly less            01/01/70 00:00      
            who gives a hoot            01/01/70 00:00      
               maybe yes, maybe not...            01/01/70 00:00      
   Choose the appropriate tool!            01/01/70 00:00      
      Don't have much of a choice!            01/01/70 00:00      
         drop the "coding standards"            01/01/70 00:00      
         Yikes.            01/01/70 00:00      
            down memory lane            01/01/70 00:00      
               a possible compromise...            01/01/70 00:00      
                  Well...            01/01/70 00:00      
               The other end of the spectrum ...            01/01/70 00:00      
                  afer quite a few iterations....            01/01/70 00:00      
                     The guide to writing unmaintainable code says:            01/01/70 00:00      
         That's the kind of nonsense...            01/01/70 00:00      
   put some load on the hardware            01/01/70 00:00      
      Jan, oh Jan            01/01/70 00:00      
      9-bit - more work for the hardware!            01/01/70 00:00      
         true, but...            01/01/70 00:00      
            It is...            01/01/70 00:00      
               calculate the ISR after making the ISR skip            01/01/70 00:00      
   Optimizing C            01/01/70 00:00      
      just one example            01/01/70 00:00      
         The advantage is...            01/01/70 00:00      
            If the thinking had preceded the coding ...            01/01/70 00:00      
               you miss the point            01/01/70 00:00      
                  then what's the chance of having him to C-craft?            01/01/70 00:00      
                     zero            01/01/70 00:00      
                     Job security, of course.            01/01/70 00:00      
      Examples are not equivalent            01/01/70 00:00      
         Wasn\'t saying that they were.            01/01/70 00:00      
            I just tried SDCC...            01/01/70 00:00      
               Hm, can you post the assembly output ?            01/01/70 00:00      
                  Keil does this            01/01/70 00:00      
                     Interesting.            01/01/70 00:00      
                     Optimizing and Keil/SDCC/Raisonance            01/01/70 00:00      
                        Retort            01/01/70 00:00      
                           Register Banks...            01/01/70 00:00      
                              benchmarks            01/01/70 00:00      
                              tools differ            01/01/70 00:00      
                              Clarification            01/01/70 00:00      
                                 comments            01/01/70 00:00      
                                    not to write things twice            01/01/70 00:00      
                                       no need            01/01/70 00:00      
                                          And how does this produce two incarnations?            01/01/70 00:00      
                                             like this            01/01/70 00:00      
                                                hehe            01/01/70 00:00      
                                                   this is no better confusion-wise            01/01/70 00:00      
                                                      what is "efficient"            01/01/70 00:00      
                                                         ok is \'safe\' better?            01/01/70 00:00      
                                                            How to convey our ideas to the mcu?            01/01/70 00:00      
                                                               Carefull now, you could end with Prolog :)            01/01/70 00:00      
                                                                  my kids            01/01/70 00:00      
                                                            Huge code != huge time            01/01/70 00:00      
                                                               This comes under the heading of "famous last words            01/01/70 00:00      
                        the question I always raise on this            01/01/70 00:00      
                           Here's Why...            01/01/70 00:00      
                  SDCC            01/01/70 00:00      
                     Thanks. Also interesting.            01/01/70 00:00      
                     SDCC peephole optimiser conflict            01/01/70 00:00      
                  Raisonance            01/01/70 00:00      
   help me ,I NEED SOME HELP ON MY PROJECT            01/01/70 00:00      
      that is NOT 'help'            01/01/70 00:00      
      Well that is not the way to get it!            01/01/70 00:00      
      start a new thread!            01/01/70 00:00      

Back to Subject List