2014-04-03  Cong Hou  <congh@google.com>

PR tree-optimization/60505
    * tree-vectorizer.h (struct _stmt_vec_info): Add th field as the
    threshold of number of iterations below which no vectorization will be
    done.
    * tree-vect-loop.c (new_loop_vec_info):
    Initialize LOOP_VINFO_COST_MODEL_THRESHOLD.
    * tree-vect-loop.c (vect_analyze_loop_operations):
    Set LOOP_VINFO_COST_MODEL_THRESHOLD.
    * tree-vect-loop.c (vect_transform_loop):
    Use LOOP_VINFO_COST_MODEL_THRESHOLD.
    * tree-vect-loop.c (vect_analyze_loop_2): Check the maximum number
    of iterations of the loop and see if we should build the epilogue.

2014-04-03  Cong Hou  <congh@google.com>

    PR tree-optimization/60505
    * gcc.dg/vect/pr60505.c: New test.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@209065 138bc75d-0d04-0410-961f-82ee72b054a4