Cool, but it doesn't generate SBB in real code, but instead gives me something like this:

    xorl %r11d, %r11d
    cmpl %r12d, %eax
    seta %r11b

And if I do both of these, side by side:

    tmp = rc.code < rc_bound ? ~0 : 0;
    if (rc.code < rc_bound) rc.range = rc_bound;

Then GCC generates an if-else branch.

Thus, inline assembly is the only option so far to prevent the compiler from doing something dumb.