OpenMP loop cloning for SIMT execution

OpenMP loop cloning for SIMT execution

2016-11-22  Jakub Jelinek  <jakub@redhat.com>
            Alexander Monakov  <amonakov@ispras.ru>

	* internal-fn.c (expand_GOMP_USE_SIMT): New function.
	* tree.c (omp_clause_num_ops): OMP_CLAUSE__SIMT_ has 0 operands.
	(omp_clause_code_name): Add _simt_ name.
	(walk_tree_1): Handle OMP_CLAUSE__SIMT_.
	* tree-core.h (enum omp_clause_code): Add OMP_CLAUSE__SIMT_.
	* omp-low.c (scan_sharing_clauses): Handle OMP_CLAUSE__SIMT_.
	(scan_omp_simd): New function.
	(scan_omp_1_stmt): Use it in target regions if needed.
	(omp_max_vf): Don't max with omp_max_simt_vf.
	(lower_rec_simd_input_clauses): Use omp_max_simt_vf if
	OMP_CLAUSE__SIMT_ is present.
	(lower_rec_input_clauses): Compute maybe_simt from presence of
	OMP_CLAUSE__SIMT_.
	(lower_lastprivate_clauses): Likewise.
	(expand_omp_simd): Likewise.
	(execute_omp_device_lower): Lower IFN_GOMP_USE_SIMT.
	* internal-fn.def (GOMP_USE_SIMT): New internal function.
	* tree-pretty-print.c (dump_omp_clause): Handle OMP_CLAUSE__SIMT_.

Co-Authored-By: Alexander Monakov <amonakov@ispras.ru>
From-SVN: r242714