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???
05/16/07 15:40
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 		 #139358 - Often mutually exclusive...
Responding to: ???'s previous message
Marcos Frago said:
In order to write efficient C routines (fast execution / small program code)

Fast execution and small program code are often mutually exclusive - ie, you can have one or the other, but not both.

eg:

  • writing a loop uses less code than repeating the same set of code many times, but is slower due to the loop overhead

  • putting common code into functions reduces code size, but is slower due to the call/return overhead

    • List of 43 messages in thread
    TopicAuthorDate
    How to speed code?            01/01/70 00:00      
       How did you come to that bizarre idea...            01/01/70 00:00      
          bizarre!?            01/01/70 00:00      
             I am a C-hater, remember...            01/01/70 00:00      
          Smaller, Faster            01/01/70 00:00      
       Is that true??            01/01/70 00:00      
       Often mutually exclusive...            01/01/70 00:00      
       Take my contribution with a grain of salt.            01/01/70 00:00      
          http://www.8052.com/users/disasm/            01/01/70 00:00      
       what compiler?            01/01/70 00:00      
       Data types            01/01/70 00:00      
       Getting the least            01/01/70 00:00      
       My Two Cents            01/01/70 00:00      
          Turn in your Programmer's ID Card.            01/01/70 00:00      
             heheh...yeah            01/01/70 00:00      
             SJMP            01/01/70 00:00      
       Comments            01/01/70 00:00      
       How to speed code?            01/01/70 00:00      
       a couple of \'rules\'            01/01/70 00:00      
          More on Erik's Rules            01/01/70 00:00      
             a comment            01/01/70 00:00      
             PDATA            01/01/70 00:00      
                don't forget about @DPTR access to CDATA            01/01/70 00:00      
                   but            01/01/70 00:00      
                      WHAT??? You mean I have it too? Dystypia?            01/01/70 00:00      
                         Enginnering is all about the tradeoffs            01/01/70 00:00      
                            two places where you REALLY can make an impact            01/01/70 00:00      
                               b) buffer at 256 byte boundary            01/01/70 00:00      
                                  Alignment            01/01/70 00:00      
                                  you did'nt hear ?            01/01/70 00:00      
                   Another \"but\"            01/01/70 00:00      
                      it is, after all, quicker            01/01/70 00:00      
                         Errr...            01/01/70 00:00      
                            perhaps, but it has to "live" somewhere.            01/01/70 00:00      
                               You\'re assuming...            01/01/70 00:00      
                                  confirming Andys statement            01/01/70 00:00      
                                     We WERE discusisng 805x ...            01/01/70 00:00      
                                        well, does it not?            01/01/70 00:00      
                                           Tables in code space vs data space            01/01/70 00:00      
                                              Philps XA, the best "16 bit '51"            01/01/70 00:00      
                                                 Maxim/Dallas DS89C450            01/01/70 00:00      
       most compilers            01/01/70 00:00      
          Thanks            01/01/70 00:00      

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