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| Compiler and functions.... |
 Posted: Thu Oct 27, 2005 6:23 am |
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Hi all,
I'm using a PIC16F877A and I have a question that maybe is a silly question, but that can clarify some doubts I have...
I wrote a function and then I call it during the program.
I try to optimize this function and I hope that the compiler loads it only once in the program memory and jump to the function address every time I call during the execution of my code...
But when I look into the .tre file I find this function many and many times, what does it mean?
Thanks in advantage, Andrea |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Re: Compiler and functions.... |
| Posted: Thu Oct 27, 2005 7:33 am |
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| Anonymous wrote: | Hi all,
I'm using a PIC16F877A and I have a question that maybe is a silly question, but that can clarify some doubts I have...
I wrote a function and then I call it during the program.
I try to optimize this function and I hope that the compiler loads it only once in the program memory and jump to the function address every time I call during the execution of my code...
But when I look into the .tre file I find this function many and many times, what does it mean?
Thanks in advantage, Andrea |
Take out your optimization and look at the file again
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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kypec
Joined: 20 Sep 2003
Posts: 54
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| Posted: Thu Oct 27, 2005 7:34 am |
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If you want the compiler to include the body of your function
only once in the program memory then use #separate directive
just before the function definition.
| Code: | #separate
int8 my_func(int1 arg1,int8 arg8) {
...
} |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Thu Oct 27, 2005 7:46 am |
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| Quote: | | But when I look into the .tre file I find this function many and many times, what does it mean? |
Calling a function has overhead, for short functions the compiler might decide it's better to handle them as #inline. The compiler decisions are based on the optimizer settings, optimizing for speed or program size. |
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