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???
05/18/07 13:49
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 		 #139487 - Alignment
Responding to: ???'s previous message
Frieder Ferlemann said:
Usually addresses for variables are only known after the linking stage. - Too late for the compiler to notice and generate more efficient code for aligned access.

Some compilers have keywords/pragmas to control alignment.
Don't know if this applies to any 8051 compilers, though (I certainly haven't noticed it in Keil)...



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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