Hi,

This patch fixes PR 49352 by ignoring debug uses in SLP reduction detection.
While fixing it Jakub also discovered that an incorrect statement may
be analyzed and operands of not commutative operation may be swapped.
The patch fixes those as well.

Bootstrapped and tested on powerpc64-suse-linux.
Committed.

Ira

ChangeLog:

2011-06-13 Jakub Jelinek  <jakub@redhat.com>
           Ira Rosen  <ira.rosen@linaro.org>

        PR tree-optimization/49352
        * tree-vect-loop.c (vect_is_slp_reduction): Don't count debug uses at
        all, make sure loop_use_stmt after the loop is a def stmt of a used
        SSA_NAME that is the only one defined inside of the loop.  Don't
        check for COND_EXPR and GIMPLE_BINARY_RHS.
        (vect_is_simple_reduction_1): Call vect_is_slp_reduction only if
        check_reduction is true.



2011-06-13 Jakub Jelinek  <jakub@redhat.com>
                 Ira Rosen  <ira.rosen@linaro.org>

	PR tree-optimization/49352
	* gcc.dg/vect/pr49352.c: New test.