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* internal-fn.def (GOACC_REDUCTION): New. * internal-fn.h (enum ifn_goacc_reduction_kind): New. * internal-fn.c (expand_GOACC_REDUCTION): New. * target.def (goacc.reduction): New OpenACC hook. * targhooks.h (default_goacc_reduction): Declare. * doc/tm.texi.in: Add TARGET_GOACC_REDUCTION. * doc/tm.texi: Rebuilt. * omp-low.c (oacc_get_reduction_array_id, oacc_max_threads, scan_sharing_clauses): Remove oacc reduction handling here. (lower_rec_input_clauses): Don't handle OpenACC reductions here. (oacc_lower_reduction_var_helper): Delete. (lower_oacc_reductions): New. (lower_reduction_clauses): Don't handle OpenACC reductions here. (lower_oacc_head_tail): Call lower_oacc_reductions. (oacc_gimple_assign, oacc_init_reduction_array, oacc_initialize_reduction_data, oacc_finalize_reduction_data, oacc_process_reduction_data): Delete. (lower_omp_target): Remove old OpenACC reduction handling. Insert dummy OpenACC gang reduction for reductions at outer level. (oacc_loop_xform_head_tail): Transform IFN_GOACC_REDUCTION. (default_goacc_reduction): New. (execute_oacc_device_lower): Handle IFN_GOACC_REDUCTION. From-SVN: r229767
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