Hello,
for this reason, I try to avoid parameters in function calls.
The think I do not understand, the allocation of temporary storage.
Sometimes there is absolutely no need for the, but are allocated anyway.
Theblond
Sébastien Lorquet írta:
> hello,
>
> I have a question about something I didn't find in the manual.
>
> With the pic16, we automatically have a stack. The resulting code is huge.
>
> char foo(char c, char d) {
> return c+d;
> }
>
> generates:
> ; ; Starting pCode block
> S_main__foo code
> _foo:
> ; .line 81; main.c char foo(char c, char d) {
> MOVFF FSR2L, POSTDEC1
> MOVFF FSR1L, FSR2L
> MOVFF r0x00, POSTDEC1
> MOVFF r0x01, POSTDEC1
> MOVLW 0x02
> MOVFF PLUSW2, r0x00
> MOVLW 0x03
> MOVFF PLUSW2, r0x01
> ; .line 82; main.c return c+d;
> MOVF r0x01, W
> ADDWF r0x00, F
> MOVF r0x00, W
> MOVFF PREINC1, r0x01
> MOVFF PREINC1, r0x00
> MOVFF PREINC1, FSR2L
> RETURN
>
> This is a very big overhead. and every movff counts for 2 instructions.
>
> But on the contrary, the 8051 port maps its local variables and
> parameters in normal ram, managing the overlaps.
>
> Why can't we use such a data model for the pic port?
>
> this would make a much more compact code.
>
> Regards
> Sebastien
>
>
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