Re: [Gm2] Over-aggressive Optimizations with gcc 4.1.1

[Waldek Hebisch]

Gaius Mulley wote:
> John O Goyo <address@hidden> writes:
<snip>
> > gcc-4.1.1-32: tst=> gm2 -S -I. -O2 add.mod
> > gcc-4.1.1-32: tst=> cat add.s
> >          .file   "add.mod"
> >          .ident  "GCC: (GNU) 4.1.1"
> > gcc-4.1.1-32: tst=>
> > 
> > Hhhmm..... #6-)
> > john
> 
> Hi John,
> 
> thanks for the report - yes gm2 does perform some rather optimistic
> transformations..  looks like we need another set of regression tests
> which perform -O2 and a link and run.
>

Do you mean that gm2 frontend mis-optimizes the code.  For Pascal I
found out that 4.x backend has quite aggresive removal of "unused" code.
At -O2 and -O3 cgraph routines start from known external entries
and mark reachable objects.  Everything unreachable is removed.
I had to make sure that backend knows about all exported functions
(otherwise it removed them): I do not remember exactly what I did,
but I think it is enough to make sure that your declaration is
on the list returned by getdecls and has proper bits set (TREE_PUBLIC
and TREE_STATIC).

-- 
                              Waldek Hebisch
address@hidden