rs6000.c (output_vec_const_move): Find all cases of EASY_VECTOR_15_ADD_SELF.

rs6000.c (output_vec_const_move): Find all cases of EASY_VECTOR_15_ADD_SELF.

        * config/rs6000/rs6000.c (output_vec_const_move):
        Find all cases of EASY_VECTOR_15_ADD_SELF.
        (easy_vector_constant_add_self): Accept
        all vector constant loadable by vsplt* and vadd*.
        (easy_vector_same): Use easy_vector_splat_const.
        (easy_vector_const): Use easy_vector_splat_const.
        (easy_vector_splat_const): New function.
        (gen_easy_vector_constant_add_self): New function.

        * config/rs6000/rs6000-protos.c (gen_easy_vector_constant_add_self):
        New prototype.

        * config/rs6000/altivec.md (movv4si splitter): Change to
        emit move insn with halfed vector constant.
        (*movv8hi splitter): Likewise.
        (*movv16qi splitter): Likewise.

From-SVN: r80077