------- Additional Comments From dberlin at gcc dot gnu dot org 2004-11-23
02:53 -------
(In reply to comment #8)
> yes, but if GVNPRE hoists the operation, we end up with:
>
> int f(int i, int b, int *c)
> {
> int ii;
> ii = i+1;
> if (b)
> ;
> else
> *c = ii;
> return ii;
> }
>
> that can be later simplified to:
>
> int f(int i, int b, int *c)
> {
> int ii;
> ii = i+1;
> if (!b)
> *c = ii;
> return ii;
> }
>
This is still not faster code, only smaller code.
And you'll note that with -Os, this is what we do.
In any case, i have no plan sto make GVN-PRE do this type of hoisting, as i'm
not so interested in code size.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|dberlin at gcc dot gnu dot |unassigned at gcc dot gnu
|org |dot org
Status|ASSIGNED |NEW
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15559
