[Bug tree-optimization/55334] [4.8 Regression] mgrid regression (ipa-cp disables vectorization)

[jamborm at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55334

--- Comment #28 from Martin Jambor <jamborm at gcc dot gnu.org> 2013-02-20 11:13:04 UTC ---
(In reply to comment #27)
> Yes, preserving COMPONENT_REFs would help here, but it is not
> correct (even for this testcase the types do not match).
> 

So you know where the mismatch is?  I looked whether I could refuse to
IPA-CP just type-mismatched values to restrict pointers but at least
when still in IPA-CP, which checks it, the value and the type of the
parameter conform to useless_type_conversion_p.  So I'll go ahead and
commit http://gcc.gnu.org/ml/gcc-patches/2013-02/msg00870.html with
the requested tweak.