[Tinycc-devel] Statically computed label differences

[Petr Skocik]

Hi.

In https://software.intel.com/sites/default/files/m/a/1/e/dsohowto.pdf 
Ulrich Drepper recommends static jump tables based on label offsets
rather than labels' absolute values in order to minimize relocations.

Drepper's example:

int add (int a, int b) {
    static const int offsets[] = {
        &&a0-&&a0, &&a1-&&a0, &&a2-&&a0
    };
    goto *(&&a0 + offsets[b]);
a0:
    return a + 0;
a1:
    return a + 1;
a2:
    return a + 2;
}

This doesn't work on tcc, at least not with the array being `static`
(error: initializer element is not constant).

I guess there isn't an easy fix that would make this work on tinycc's
part (without modifications to the example code)?

Thanks.

Regards,
Petr S.