[PATCH] AV - Use distance vector

[Devang Patel <dpatel at apple dot com>]

This patch updates auto vectorizer to use distance
vector info while analyzing data dependence. It uses
existing API to compute distance vector.

With this patch included test cases are auto vectorized.
This patch is also required to vectorize if-converted
loops.

Bootstrapped and tested on powerpc-darwin.

OK?
Thanks,
-
Devang

2004-09-15  Devang Patel  <dpatel@apple.com>

        * tree-data-ref.c (compute_distance_vector): Export.
        * tree-data-ref.h (compute_distance_vector): Same.
        * tree-vectorizer.c (vect_analyze_data_ref_dependence): new 
parameter,
        loop_vinfo. Use distance vector.
        (vect_analyze_data_ref_dependences): Supply new parameter.
        (vect_analyze_loop): Analyze operations before data dependences.

        testsuite

        * gcc.dg/vect/vect-20040915-1.c: New test.

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