* andrewhutchin...@cox.net <andrewhutchin...@cox.net> [09-12-15 19:09]:
> void (*fptr)();
>
> fptr = main;
>
> (*fptr)(); //Will use EICALL - should be CALL main
Hm, this problem seems to exist not only for the "big device". Using gcc
4.3.4 (from debian testing) on following C file with
$ avr-gcc -Wa,-adhlns=foo.lst foo.c -o foo.out -O2 -mmcu=atmega88
-- foo.c --------
static const void (*fptr)() = 0;
int main(void) {
fptr();
}
-----------------
yields the following code:
-----------------
13 main:
14 /* prologue: function */
15 /* frame size = 0 */
16 0000 E0E0 ldi r30,lo8(0)
17 0002 F0E0 ldi r31,hi8(0)
18 0004 0995 icall
19 /* epilogue start */
20 0006 0895 ret
-----------------
i.e. uses an indirect call instead of an direct call.
- Lars.
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