------- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-08
23:34 -------
Confirmed, here is the full testcase by the way:
int f(int i, int j)
{
if (i!=j)
return i - j;
return 0;
}
Note I did not say the patch is useless but I just wantted to say that it would
be useful if gcc did this for
us instead of changing the code. Anyways this can be done with PHI-OPT, I will
try to look into this
doing this for 4.1. Your patch should be still considered.
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |pinskia at gcc dot gnu dot
| |org
Severity|normal |enhancement
Status|UNCONFIRMED |NEW
Component|c |tree-optimization
Ever Confirmed| |1
Keywords| |missed-optimization
Last reconfirmed|0000-00-00 00:00:00 |2005-02-08 23:34:07
date| |
Summary|Missed optimisation |don't remove an if when we
| |know the value is the same
| |as with the if (subtraction)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19832
