Hello,
Another question for you Lionel ! (...or for anybody who knows the answer of course)

This instruction throws a memory error :
void *buffer = malloc(LCD_SIZE);
I think that malloc returns only NULL when there is not enough memory, and doesn't throw any error.
Besides, I think that a lack of memory is not a problem because this code prints 3840/78868 before the malloc, so there is enough memory:
printf("%d / %lu", LCD_SIZE, HeapAvail());
I know it's vague but I can't post all the code of my fat program here, but perhaps you've encountered a situation like that before me and you could enlighten me ?
Thanks in advance,
Torio

Well, well, well... Always that bloody stack.
So let's review the methods you gave me in a previous subject :

eliminating SAVE_STACK (saving/restoring the screen yourself, in an allocated memory block or through the method used by the Home Screen Restore program)

Done.

reducing call nesting

I don't use recersive functions.

using the registers to pass parameters (__attribute__((__regparm__)) on single functions, -mregparm=5 compiler switch)

This may be my last option.
I don't know what you mean by passing parameters on single functions (and what is a single function, by the way ?)...
For -mregparm=5 compiler switch, I guess I have to add "-mregparm=5" at the end of the text box in Project->Options->Compilation->GCC Switches. Am I right ?

Are you saving and restoring the screen yourself to local buffers (buffers declared inside functions, as opposed to global buffers) ?

Yes, it's already done 

Yup. And that's a global switch which applies to all functions; if you wanted to enable it on several functions only, you'd use __attribute__((__regparm__(5))) in the definition of each of those functions

I applied the switch, it doesn't change anything... 

In any case, you can send me a copy of the code base, like the previous time I performed optimizations on it

I will send it to you by mail in a few hours. 

I don't think I'll have time to do much on it before the week-end, though.

Oh, don't worry about that. Tomorrow is the beginning of school for me, and I take my first year of Prepa (MPSI, if you want to know) so I will only have access to my computer on holiday. You will have about 1-2 months to look my code. Is that okay ?