OpenACC: Basic support for #pragma acc parallel.

OpenACC: Basic support for #pragma acc parallel.

	gcc/c-family/
	* c-pragma.h (pragma_kind): Add PRAGMA_OACC_PARALLEL.
	* c-pragma.c (oacc_pragmas): Add "parallel".
	gcc/c/
	* c-parser.c (c_parser_omp_structured_block): Update comment.
	(c_parser_oacc_parallel): New function.
	(c_parser_omp_construct): Handle PRAGMA_OACC_PARALLEL.

	gcc/
	* tree.def (OACC_PARALLEL): New code.
	* doc/generic.texi (OpenMP): Document it.
	* tree.h (OMP_BODY, OMP_CLAUSES): Include it.
	(OACC_PARALLEL_BODY, OACC_PARALLEL_CLAUSES): New macros.
	* tree-pretty-print.c (dump_generic_node): Handle OACC_PARALLEL.
	gcc/c/
	* c-tree.h (c_finish_oacc_parallel): New declaration.
	* c-typeck.c (c_finish_oacc_parallel): New function.
	gcc/c-family/
	* c-omp.c (c_omp_split_clauses): Catch OACC_PARALLEL.

	gcc/
	* gimple.def (GIMPLE_OACC_PARALLEL): New code.
	* doc/gimple.texi: Document it.
	* gimple.h (gimple_build_oacc_parallel): New declaration.
	(gimple_oacc_parallel_clauses, gimple_oacc_parallel_clauses_ptr)
	(gimple_oacc_parallel_set_clauses, gimple_oacc_parallel_child_fn)
	(gimple_oacc_parallel_child_fn_ptr)
	(gimple_oacc_parallel_set_child_fn, gimple_oacc_parallel_data_arg)
	(gimple_oacc_parallel_data_arg_ptr)
	(gimple_oacc_parallel_set_data_arg): New inline functions.
	(CASE_GIMPLE_OMP): Add GIMPLE_OACC_PARALLEL.
	* gimple.c (gimple_build_oacc_parallel): New function.
	(walk_gimple_op, walk_gimple_stmt, gimple_copy): Handle
	GIMPLE_OACC_PARALLEL.
	* gimplify.c (is_gimple_stmt): Handle GIMPLE_OACC_PARALLEL.
	(gimplify_oacc_parallel): New function.
	(gimplify_expr): Handle OACC_PARALLEL.
	* cgraphbuild.c (build_cgraph_edges): Handle GIMPLE_OACC_PARALLEL.
	* gimple-low.c (lower_stmt): Likewise.
	* gimple-pretty-print.c (pp_gimple_stmt_1): Likewise.
	(dump_gimple_oacc_parallel): New function.
	* oacc-builtins.def (BUILT_IN_GOACC_PARALLEL): New macro.
	* omp-low.c (scan_oacc_parallel, expand_oacc_parallel)
	(lower_oacc_parallel): New functions.
	(use_pointer_for_field, build_outer_var_ref, scan_sharing_clauses)
	(create_omp_child_function, check_omp_nesting_restrictions)
	(scan_omp_1_stmt, lower_rec_simd_input_clauses)
	(lower_lastprivate_clauses, lower_reduction_clauses)
	(lower_copyprivate_clauses, lower_send_clauses)
	(lower_send_shared_vars, expand_omp)
	(maybe_add_implicit_barrier_cancel, create_task_copyfn)
	(lower_omp_1, make_gimple_omp_edges): Handle GIMPLE_OACC_PARALLEL,
	or catch it.
	* tree-inline.c (remap_gimple_stmt): Likewise.
	* tree-nested.c (convert_nonlocal_reference_stmt)
	(convert_local_reference_stmt, convert_tramp_reference_stmt)
	(convert_gimple_call): Likewise.
	gcc/testsuite/
	* c-c++-common/goacc-gomp/nesting-fail-1.c: New file.
	* c-c++-common/goacc/nesting-fail-1.c: Likewise.
	* c-c++-common/goacc/parallel-1.c: Likewise.
	* c-c++-common/goacc/parallel-fail-1.c: Likewise.

	libgomp/
	* oacc-parallel.c: New file.
	* Makefile.am (libgomp_la_SOURCES): Add it.
	* Makefile.in: Regenerate.
	* libgomp.map (GOACC_2.0): Add GOACC_parallel.
	* libgomp_g.h (GOACC_parallel): New declaration.
	* testsuite/libgomp.oacc-c/goacc_parallel.c: New file.
	* testsuite/libgomp.oacc-c/parallel-1.c: New file.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gomp-4_0-branch@204532 138bc75d-0d04-0410-961f-82ee72b054a4