Hi,

The test in PR 49318 fails because the vectorizer recognizes address
computation sequence as a widening-multiplication pattern, while such
sequence is not relevant to vectorization. The problem is that the
vectorizer doesn't check if a statement is going to be vectorized
before replacing it with a pattern. Moreover, the vectorizer first
detects the patterns and only after that looks for relevant
statements. Changing the order is not a good option, since statements
relevance is defined also by their belonging to a pattern.

This patch solves the problem by removing pattern statements that were
created for statements that are not supposed to be vectorized.

Bootstrapped with vectorization enabled on powerpc64-suse-linux and
tested on powerpc64-suse-linux and x86_64-suse-linux.
Committed.

Ira

ChangeLog:

     PR tree-optimization/49318
     * tree-vect-loop.c (vect_determine_vectorization_factor):
     Remove irrelevant pattern statements.

testsuite/ChangeLog:

     PR tree-optimization/49318
     * gcc.dg/vect/pr49318.c: New test.