[PATCH] Enable vectorization of GEP expressions in SLP

[Michael Zolotukhin]

Hi,

Currently SLP vectorizer can’t handle GEP expressions, and hence it fails to vectorize the following example:
struct bounds {
  int *start;
  int *end;

  void init(bounds *one) {
    start = one->start + 10;
    end   = one->end   + 12;
  };
};

Here GEP could be easily vectorized just like a usual add-operation. The attached patch implements it.

With this change performance on SPEC/CFP2006/447.dealII is improved by 2%, while performance of other tests remains unchanged.

Is it ok for trunk?



Thanks,
Michael
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