[PATCH] Yet another simple fix to enhance outer-loop vectorization.

[Yuri Rumyantsev]

Hi All,

Here is a simple fix which allows duplication of outer loops to
perform peeling for number of iterations if outer loop is marked with
pragma omp simd.

Bootstrap and regression testing did not show any new failures.
Is it OK for trunk?

ChangeLog:

2015-06-08  Yuri Rumyantsev  <ysrumyan@gmail.com>

* tree-vect-loop-manip.c (rename_variables_in_bb): Add argument
to allow renaming of PHI arguments on edges incoming from outer
loop header, add corresponding check before start PHI iterator.
(slpeel_tree_duplicate_loop_to_edge_cfg): Introduce new bool
variable DUPLICATE_OUTER_LOOP and set it to true for outer loops
with true force_vectorize.  Set-up dominator for outer loop too.
Pass DUPLICATE_OUTER_LOOP as argument to rename_variables_in_bb.
(slpeel_can_duplicate_loop_p): Allow duplicate of outer loop if it
was marked with force_vectorize and has restricted cfg.
* tre-vect-loop.c (vect_analyze_loop_2): Prohibit alignment peeling
for outer loops.

gcc/testsuite/ChangeLog:
* gcc.dg/vect/vect-outer-simd-2.c: New test.
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