[Bug tree-optimization/52975] Ofast produces not optimized code for vectorized "converted if"

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52975

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
           Keywords|                            |missed-optimization
   Last reconfirmed|                            |2012-04-13
          Component|rtl-optimization            |tree-optimization
         AssignedTo|unassigned at gcc dot       |rguenth at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-04-13 14:05:12 UTC ---
Yes, I noticed this.  For scalar code we can handle the mess caused by
if-conversion in RTL optimization, for vectorized code we cannot.
I have a patch that fixes it for -O3 at least - for -Ofast we run foul
of if-conversion changing the conditions from < 0.0 to >= 0.0 on the
else branch.

I'll think about the best way of dealing with that.