[Bug target/61108] gcc 4.8.2 generates incorrect integer arithmetic at O3 (ok at O2)

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61108

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-05-08
          Component|tree-optimization           |target
     Ever confirmed|0                           |1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The problem looks related to WIDEN_MULT_EVEN_EXPR/WIDEN_MULT_ODD_EXPR .

If we add an assignment from t to an array, we get
WIDEN_MULT_LO_EXPR/WIDEN_MULT_HI_EXPR which works.

So in the end this is a target issue since this is correct at tree level and it
looks like it is just an expansion of that is causing the issue.