On Thu, Jan 7, 2010 at 11:46 AM, Paulo J. Matos <pocma...@gmail.com> wrote:
> Hi all,
>
> With the code:
> -----------------------------
> extern void display(unsigned int);
>
> void callee(int z) // Sibcall worth it
> {
> display(z);
> }
>
> void caller(int x, int y) // Sibcall not worth it
> {
> display(x);
> display(y);
> callee(x*y);
> }
> -----------------------------
>
> I have put a few prints in TARGET_FUNCTION_OK_FOR_SIBCALL (when
> compiled with -Os):
> current pass = expand (135)
> Function ok: callee
> Callee display
> framesize 0
> totalsize 2
> current_function_pretend_args_size 0
>
> current pass = expand (135)
> Function ok: caller
> Callee display
> framesize 0
> totalsize 0
> current_function_pretend_args_size 0
>
This case is interesting because it seems that callee is being inlined
into caller. Still intriguing is that the same happens with: -Os
-fno-inline -fno-inline-small-functions
-fno-inline-functions-called-once
--
Paulo Jorge Matos - pocmatos at gmail.com
http://www.pmatos.net
