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* [gcc/devel/omp/gcc-12] openmp: Partial OpenMP 5.2 doacross and omp_cur_iteration support
@ 2022-09-05  8:19 Tobias Burnus
  0 siblings, 0 replies; only message in thread
From: Tobias Burnus @ 2022-09-05  8:19 UTC (permalink / raw)
  To: gcc-cvs

https://gcc.gnu.org/g:92e848d3aeb2b616512cc0e64274e58734fac9e7

commit 92e848d3aeb2b616512cc0e64274e58734fac9e7
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Mon Sep 5 09:39:04 2022 +0200

    openmp: Partial OpenMP 5.2 doacross and omp_cur_iteration support
    
    The following patch implements part of the OpenMP 5.2 changes related
    to ordered loops and with the assumed resolution of
    https://github.com/OpenMP/spec/issues/3302 issues.
    
    The changes are:
    1) the depend clause on stand-alone ordered constructs has been renamed
       to doacross (because depend clause has different syntax on other
       constructs) with some syntax changes below, depend clause is deprecated
       (we'll deprecate stuff on the GCC side only when we have everything else
       from 5.2 implemented)
       depend(source) -> doacross(source:) or doacross(source:omp_cur_iteration)
       depend(sink:vec) -> doacross(sink:vec) (where vec has the same syntax
                                               as before)
    2) in 5.1 and before it has been significant whether ordered clause has or
       doesn't have an argument, if it didn't, only block-associated ordered
       could appear in the body, if it did, only stand-alone ordered could appear
       in the body, all loops had to be perfectly nested, no associated
       range-based for loops, no linear clause on work-sharing loop and ordered
       clause with an argument wasn't allowed on composite for simd.
       In 5.2, whether ordered clause has or doesn't have an argument is
       insignificant (except for bugs in the standard, #3302 mentions those),
       if the argument is missing, it is simply treated as equal to collapse
       argument (if any, otherwise 1).  The implementation better should be able
       to differentiate between ordered and doacross loops at compile time
       which previously was through the absence or presence of the argument,
       now it is done through looking at the body of the construct lexically
       and looking for stand-alone ordered constructs.  If there are any,
       it is to be handled as doacross loop, otherwise it is ordered loop
       (but in that case ordered argument if present must be equal to collapse
       argument - 5.2 says instead it must be one, but that is clearly wrong
       and mentioned in #3302) - stand-alone ordered constructs must appear
       lexically in the body (and had to before as well).  For the restrictions
       mentioned above, the for simd restriction is gone (stand-alone ordered
       can't appear in simd construct, so that is enough), and the other rules
       are expected to be changed into something related to presence of
       stand-alone ordered constructs in the body
    3) 5.2 allows a new syntax, doacross(sink:omp_cur_iteration-1), which
       means wait for previous iteration in the iteration space of all the
       associated loops
    
    The following patch implements that, except that we sorry for now
    on the doacross(sink:omp_cur_iteration-1) syntax during omp expansion
    because library side isn't done yet for it.  It doesn't implement it for
    the Fortran FE either.
    Incrementally, I'd like to change the way we differentiate between
    stand-alone and block-associated ordered constructs, because the current
    way of looking for presence of doacross clause doesn't work well if those
    clauses are removed because they had been invalid (wrong syntax or
    unknown variables in it etc.) and of course implement
    doacross(sink:omp_cur_iteration-1).
    
    2022-09-03  Jakub Jelinek  <jakub@redhat.com>
    
    gcc/
            * tree-core.h (enum omp_clause_code): Add OMP_CLAUSE_DOACROSS.
            (enum omp_clause_depend_kind): Remove OMP_CLAUSE_DEPEND_SOURCE
            and OMP_CLAUSE_DEPEND_SINK, add OMP_CLAUSE_DEPEND_INVALID.
            (enum omp_clause_doacross_kind): New type.
            (struct tree_omp_clause): Add subcode.doacross_kind member.
            * tree.h (OMP_CLAUSE_DEPEND_SINK_NEGATIVE): Remove.
            (OMP_CLAUSE_DOACROSS_KIND): Define.
            (OMP_CLAUSE_DOACROSS_SINK_NEGATIVE): Define.
            (OMP_CLAUSE_DOACROSS_DEPEND): Define.
            (OMP_CLAUSE_ORDERED_DOACROSS): Define.
            * tree.cc (omp_clause_num_ops, omp_clause_code_name): Add
            OMP_CLAUSE_DOACROSS entries.
            * tree-nested.cc (convert_nonlocal_omp_clauses,
            convert_local_omp_clauses): Handle OMP_CLAUSE_DOACROSS.
            * tree-pretty-print.cc (dump_omp_clause): Don't handle
            OMP_CLAUSE_DEPEND_SOURCE and OMP_CLAUSE_DEPEND_SINK.  Handle
            OMP_CLAUSE_DOACROSS.
            * gimplify.cc (gimplify_omp_depend): Don't handle
            OMP_CLAUSE_DEPEND_SOURCE and OMP_CLAUSE_DEPEND_SINK.
            (gimplify_scan_omp_clauses): Likewise.  Handle OMP_CLAUSE_DOACROSS.
            (gimplify_adjust_omp_clauses): Handle OMP_CLAUSE_DOACROSS.
            (find_standalone_omp_ordered): New function.
            (gimplify_omp_for): When OMP_CLAUSE_ORDERED is present, search
            body for OMP_ORDERED with OMP_CLAUSE_DOACROSS and if found,
            set OMP_CLAUSE_ORDERED_DOACROSS.
            (gimplify_omp_ordered): Don't handle OMP_CLAUSE_DEPEND_SINK or
            OMP_CLAUSE_DEPEND_SOURCE, instead check OMP_CLAUSE_DOACROSS, adjust
            diagnostics that presence or absence of ordered clause parameter
            is irrelevant.  Handle doacross(sink:omp_cur_iteration-1).  Use
            actual user name of the clause - doacross or depend - in diagnostics.
            * omp-general.cc (omp_extract_for_data): Don't set fd->ordered
            if !OMP_CLAUSE_ORDERED_DOACROSS (t).  If
            OMP_CLAUSE_ORDERED_DOACROSS (t) but !OMP_CLAUSE_ORDERED_EXPR (t),
            set fd->ordered to -1 and set it after the loop in that case to
            fd->collapse.
            * omp-low.cc (check_omp_nesting_restrictions): Don't handle
            OMP_CLAUSE_DEPEND_SOURCE nor OMP_CLAUSE_DEPEND_SINK, instead check
            OMP_CLAUSE_DOACROSS.  Use actual user name of the clause - doacross
            or depend - in diagnostics.  Diagnose mixing of stand-alone and
            block associated ordered constructs binding to the same loop.
            (lower_omp_ordered_clauses): Don't handle OMP_CLAUSE_DEPEND_SINK,
            instead handle OMP_CLAUSE_DOACROSS.
            (lower_omp_ordered): Look for OMP_CLAUSE_DOACROSS instead of
            OMP_CLAUSE_DEPEND.
            (lower_depend_clauses): Don't handle OMP_CLAUSE_DEPEND_SOURCE and
            OMP_CLAUSE_DEPEND_SINK.
            * omp-expand.cc (expand_omp_ordered_sink): Emit a sorry for
            doacross(sink:omp_cur_iteration-1).
            (expand_omp_ordered_source_sink): Use
            OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
            OMP_CLAUSE_DEPEND_SINK_NEGATIVE.  Use actual user name of the clause
            - doacross or depend - in diagnostics.
            (expand_omp): Look for OMP_CLAUSE_DOACROSS clause instead of
            OMP_CLAUSE_DEPEND.
            (build_omp_regions_1): Likewise.
            (omp_make_gimple_edges): Likewise.
            * lto-streamer-out.cc (hash_tree): Handle OMP_CLAUSE_DOACROSS.
            * tree-streamer-in.cc (unpack_ts_omp_clause_value_fields): Likewise.
            * tree-streamer-out.cc (pack_ts_omp_clause_value_fields): Likewise.
    gcc/c-family/
            * c-pragma.h (enum pragma_omp_clause): Add PRAGMA_OMP_CLAUSE_DOACROSS.
            * c-omp.cc (c_finish_omp_depobj): Check also for OMP_CLAUSE_DOACROSS
            clause and diagnose it.  Don't handle OMP_CLAUSE_DEPEND_SOURCE and
            OMP_CLAUSE_DEPEND_SINK.  Assert kind is not OMP_CLAUSE_DEPEND_INVALID.
    gcc/c/
            * c-parser.cc (c_parser_omp_clause_name): Handle doacross.
            (c_parser_omp_clause_depend_sink): Renamed to ...
            (c_parser_omp_clause_doacross_sink): ... this.  Add depend_p argument.
            Handle parsing of doacross(sink:omp_cur_iteration-1).  Use
            OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
            OMP_CLAUSE_DEPEND_SINK_NEGATIVE, build OMP_CLAUSE_DOACROSS instead
            of OMP_CLAUSE_DEPEND and set OMP_CLAUSE_DOACROSS_DEPEND flag on it.
            (c_parser_omp_clause_depend): Use OMP_CLAUSE_DOACROSS_SINK and
            OMP_CLAUSE_DOACROSS_SOURCE instead of OMP_CLAUSE_DEPEND_SINK and
            OMP_CLAUSE_DEPEND_SOURCE, build OMP_CLAUSE_DOACROSS for depend(source)
            and set OMP_CLAUSE_DOACROSS_DEPEND on it.
            (c_parser_omp_clause_doacross): New function.
            (c_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_DOACROSS.
            (c_parser_omp_depobj): Use OMP_CLAUSE_DEPEND_INVALID instead of
            OMP_CLAUSE_DEPEND_SOURCE.
            (c_parser_omp_for_loop): Don't diagnose here linear clause together
            with ordered with argument.
            (c_parser_omp_simd): Don't diagnose ordered clause with argument on
            for simd.
            (OMP_ORDERED_DEPEND_CLAUSE_MASK): Add PRAGMA_OMP_CLAUSE_DOACROSS.
            (c_parser_omp_ordered): Handle also doacross and adjust for it
            diagnostic wording.
            * c-typeck.cc (c_finish_omp_clauses): Handle OMP_CLAUSE_DOACROSS.
            Don't handle OMP_CLAUSE_DEPEND_SOURCE and OMP_CLAUSE_DEPEND_SINK.
    gcc/cp/
            * parser.cc (cp_parser_omp_clause_name): Handle doacross.
            (cp_parser_omp_clause_depend_sink): Renamed to ...
            (cp_parser_omp_clause_doacross_sink): ... this.  Add depend_p
            argument.  Handle parsing of doacross(sink:omp_cur_iteration-1).  Use
            OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
            OMP_CLAUSE_DEPEND_SINK_NEGATIVE, build OMP_CLAUSE_DOACROSS instead
            of OMP_CLAUSE_DEPEND and set OMP_CLAUSE_DOACROSS_DEPEND flag on it.
            (cp_parser_omp_clause_depend): Use OMP_CLAUSE_DOACROSS_SINK and
            OMP_CLAUSE_DOACROSS_SOURCE instead of OMP_CLAUSE_DEPEND_SINK and
            OMP_CLAUSE_DEPEND_SOURCE, build OMP_CLAUSE_DOACROSS for depend(source)
            and set OMP_CLAUSE_DOACROSS_DEPEND on it.
            (cp_parser_omp_clause_doacross): New function.
            (cp_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_DOACROSS.
            (cp_parser_omp_depobj): Use OMP_CLAUSE_DEPEND_INVALID instead of
            OMP_CLAUSE_DEPEND_SOURCE.
            (cp_parser_omp_for_loop): Don't diagnose here linear clause together
            with ordered with argument.
            (cp_parser_omp_simd): Don't diagnose ordered clause with argument on
            for simd.
            (OMP_ORDERED_DEPEND_CLAUSE_MASK): Add PRAGMA_OMP_CLAUSE_DOACROSS.
            (cp_parser_omp_ordered): Handle also doacross and adjust for it
            diagnostic wording.
            * pt.cc (tsubst_omp_clause_decl): Use
            OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
            OMP_CLAUSE_DEPEND_SINK_NEGATIVE.
            (tsubst_omp_clauses): Handle OMP_CLAUSE_DOACROSS.
            (tsubst_expr): Use OMP_CLAUSE_DEPEND_INVALID instead of
            OMP_CLAUSE_DEPEND_SOURCE.
            * semantics.cc (cp_finish_omp_clause_depend_sink): Rename to ...
            (cp_finish_omp_clause_doacross_sink): ... this.
            (finish_omp_clauses): Handle OMP_CLAUSE_DOACROSS.  Don't handle
            OMP_CLAUSE_DEPEND_SOURCE and OMP_CLAUSE_DEPEND_SINK.
    gcc/fortran/
            * trans-openmp.cc (gfc_trans_omp_clauses): Use
            OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
            OMP_CLAUSE_DEPEND_SINK_NEGATIVE, build OMP_CLAUSE_DOACROSS
            clause instead of OMP_CLAUSE_DEPEND and set OMP_CLAUSE_DOACROSS_DEPEND
            on it.
    gcc/testsuite/
            * c-c++-common/gomp/doacross-2.c: Adjust expected diagnostics.
            * c-c++-common/gomp/doacross-5.c: New test.
            * c-c++-common/gomp/doacross-6.c: New test.
            * c-c++-common/gomp/nesting-2.c: Adjust expected diagnostics.
            * c-c++-common/gomp/ordered-3.c: Likewise.
            * c-c++-common/gomp/sink-3.c: Likewise.
            * gfortran.dg/gomp/nesting-2.f90: Likewise.
    
    (cherry picked from commit a651e6d59188da8992f8bfae2df1cb4e6316f9e6)

Diff:
---
 gcc/ChangeLog.omp                            |  70 +++++++++++
 gcc/c-family/c-omp.cc                        |  22 ++--
 gcc/c-family/c-pragma.h                      |   1 +
 gcc/c/ChangeLog.omp                          |  30 +++++
 gcc/c/c-parser.cc                            | 164 +++++++++++++++++-------
 gcc/c/c-typeck.cc                            |  13 +-
 gcc/cp/ChangeLog.omp                         |  38 ++++++
 gcc/cp/parser.cc                             | 178 ++++++++++++++++++++-------
 gcc/cp/pt.cc                                 |  13 +-
 gcc/cp/semantics.cc                          |  19 ++-
 gcc/fortran/ChangeLog.omp                    |  11 ++
 gcc/fortran/trans-openmp.cc                  |  12 +-
 gcc/gimplify.cc                              | 107 +++++++++++-----
 gcc/lto-streamer-out.cc                      |   3 +
 gcc/omp-expand.cc                            |  43 ++++---
 gcc/omp-general.cc                           |  12 +-
 gcc/omp-low.cc                               | 118 +++++++++---------
 gcc/testsuite/ChangeLog.omp                  |  13 ++
 gcc/testsuite/c-c++-common/gomp/doacross-2.c |  18 ++-
 gcc/testsuite/c-c++-common/gomp/doacross-5.c |  94 ++++++++++++++
 gcc/testsuite/c-c++-common/gomp/doacross-6.c |  74 +++++++++++
 gcc/testsuite/c-c++-common/gomp/nesting-2.c  |  11 +-
 gcc/testsuite/c-c++-common/gomp/ordered-3.c  |  44 +++++--
 gcc/testsuite/c-c++-common/gomp/sink-3.c     |   2 +-
 gcc/testsuite/gfortran.dg/gomp/nesting-2.f90 |   4 +-
 gcc/tree-core.h                              |  14 ++-
 gcc/tree-nested.cc                           |   2 +
 gcc/tree-pretty-print.cc                     |  68 ++++++----
 gcc/tree-streamer-in.cc                      |   5 +
 gcc/tree-streamer-out.cc                     |   4 +
 gcc/tree.cc                                  |   2 +
 gcc/tree.h                                   |  14 ++-
 32 files changed, 933 insertions(+), 290 deletions(-)

diff --git a/gcc/ChangeLog.omp b/gcc/ChangeLog.omp
index 8229319f481..08177cdd444 100644
--- a/gcc/ChangeLog.omp
+++ b/gcc/ChangeLog.omp
@@ -1,3 +1,73 @@
+2022-09-05  Tobias Burnus  <tobias@codesourcery.com>
+
+	Backport from mainline:
+	2022-09-03  Jakub Jelinek  <jakub@redhat.com>
+
+	* tree-core.h (enum omp_clause_code): Add OMP_CLAUSE_DOACROSS.
+	(enum omp_clause_depend_kind): Remove OMP_CLAUSE_DEPEND_SOURCE
+	and OMP_CLAUSE_DEPEND_SINK, add OMP_CLAUSE_DEPEND_INVALID.
+	(enum omp_clause_doacross_kind): New type.
+	(struct tree_omp_clause): Add subcode.doacross_kind member.
+	* tree.h (OMP_CLAUSE_DEPEND_SINK_NEGATIVE): Remove.
+	(OMP_CLAUSE_DOACROSS_KIND): Define.
+	(OMP_CLAUSE_DOACROSS_SINK_NEGATIVE): Define.
+	(OMP_CLAUSE_DOACROSS_DEPEND): Define.
+	(OMP_CLAUSE_ORDERED_DOACROSS): Define.
+	* tree.cc (omp_clause_num_ops, omp_clause_code_name): Add
+	OMP_CLAUSE_DOACROSS entries.
+	* tree-nested.cc (convert_nonlocal_omp_clauses,
+	convert_local_omp_clauses): Handle OMP_CLAUSE_DOACROSS.
+	* tree-pretty-print.cc (dump_omp_clause): Don't handle
+	OMP_CLAUSE_DEPEND_SOURCE and OMP_CLAUSE_DEPEND_SINK.  Handle
+	OMP_CLAUSE_DOACROSS.
+	* gimplify.cc (gimplify_omp_depend): Don't handle
+	OMP_CLAUSE_DEPEND_SOURCE and OMP_CLAUSE_DEPEND_SINK.
+	(gimplify_scan_omp_clauses): Likewise.  Handle OMP_CLAUSE_DOACROSS.
+	(gimplify_adjust_omp_clauses): Handle OMP_CLAUSE_DOACROSS.
+	(find_standalone_omp_ordered): New function.
+	(gimplify_omp_for): When OMP_CLAUSE_ORDERED is present, search
+	body for OMP_ORDERED with OMP_CLAUSE_DOACROSS and if found,
+	set OMP_CLAUSE_ORDERED_DOACROSS.
+	(gimplify_omp_ordered): Don't handle OMP_CLAUSE_DEPEND_SINK or
+	OMP_CLAUSE_DEPEND_SOURCE, instead check OMP_CLAUSE_DOACROSS, adjust
+	diagnostics that presence or absence of ordered clause parameter
+	is irrelevant.  Handle doacross(sink:omp_cur_iteration-1).  Use
+	actual user name of the clause - doacross or depend - in diagnostics.
+	* omp-general.cc (omp_extract_for_data): Don't set fd->ordered
+	if !OMP_CLAUSE_ORDERED_DOACROSS (t).  If
+	OMP_CLAUSE_ORDERED_DOACROSS (t) but !OMP_CLAUSE_ORDERED_EXPR (t),
+	set fd->ordered to -1 and set it after the loop in that case to
+	fd->collapse.
+	* omp-low.cc (check_omp_nesting_restrictions): Don't handle
+	OMP_CLAUSE_DEPEND_SOURCE nor OMP_CLAUSE_DEPEND_SINK, instead check
+	OMP_CLAUSE_DOACROSS.  Use actual user name of the clause - doacross
+	or depend - in diagnostics.  Diagnose mixing of stand-alone and
+	block associated ordered constructs binding to the same loop.
+	(lower_omp_ordered_clauses): Don't handle OMP_CLAUSE_DEPEND_SINK,
+	instead handle OMP_CLAUSE_DOACROSS.
+	(lower_omp_ordered): Look for OMP_CLAUSE_DOACROSS instead of
+	OMP_CLAUSE_DEPEND.
+	(lower_depend_clauses): Don't handle OMP_CLAUSE_DEPEND_SOURCE and
+	OMP_CLAUSE_DEPEND_SINK.
+	* omp-expand.cc (expand_omp_ordered_sink): Emit a sorry for
+	doacross(sink:omp_cur_iteration-1).
+	(expand_omp_ordered_source_sink): Use
+	OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
+	OMP_CLAUSE_DEPEND_SINK_NEGATIVE.  Use actual user name of the clause
+	- doacross or depend - in diagnostics.
+	(expand_omp): Look for OMP_CLAUSE_DOACROSS clause instead of
+	OMP_CLAUSE_DEPEND.
+	(build_omp_regions_1): Likewise.
+	(omp_make_gimple_edges): Likewise.
+	* lto-streamer-out.cc (hash_tree): Handle OMP_CLAUSE_DOACROSS.
+	* tree-streamer-in.cc (unpack_ts_omp_clause_value_fields): Likewise.
+	* tree-streamer-out.cc (pack_ts_omp_clause_value_fields): Likewise.
+	gcc/c-family/
+	* c-pragma.h (enum pragma_omp_clause): Add PRAGMA_OMP_CLAUSE_DOACROSS.
+	* c-omp.cc (c_finish_omp_depobj): Check also for OMP_CLAUSE_DOACROSS
+	clause and diagnose it.  Don't handle OMP_CLAUSE_DEPEND_SOURCE and
+	OMP_CLAUSE_DEPEND_SINK.  Assert kind is not OMP_CLAUSE_DEPEND_INVALID.
+
 2022-09-01  Andrew Stubbs  <ams@codesourcery.com>
 
 	Backport from mainline:
diff --git a/gcc/c-family/c-omp.cc b/gcc/c-family/c-omp.cc
index d71d5e446be..5c45935daca 100644
--- a/gcc/c-family/c-omp.cc
+++ b/gcc/c-family/c-omp.cc
@@ -715,8 +715,17 @@ c_finish_omp_depobj (location_t loc, tree depobj,
 
   if (clause)
     {
-      gcc_assert (TREE_CODE (clause) == OMP_CLAUSE
-		  && OMP_CLAUSE_CODE (clause) == OMP_CLAUSE_DEPEND);
+      gcc_assert (TREE_CODE (clause) == OMP_CLAUSE);
+      if (OMP_CLAUSE_CODE (clause) == OMP_CLAUSE_DOACROSS)
+	{
+	  error_at (OMP_CLAUSE_LOCATION (clause),
+		    "%<depend(%s)%> is only allowed in %<omp ordered%>",
+		    OMP_CLAUSE_DOACROSS_KIND (clause)
+		    == OMP_CLAUSE_DOACROSS_SOURCE
+		    ? "source" : "sink");
+	  return;
+	}
+      gcc_assert (OMP_CLAUSE_CODE (clause) == OMP_CLAUSE_DEPEND);
       if (OMP_CLAUSE_CHAIN (clause))
 	error_at (OMP_CLAUSE_LOCATION (clause),
 		  "more than one locator in %<depend%> clause on %<depobj%> "
@@ -728,13 +737,6 @@ c_finish_omp_depobj (location_t loc, tree depobj,
 		    "%<depobj%> dependence type specified in %<depend%> "
 		    "clause on %<depobj%> construct");
 	  return;
-	case OMP_CLAUSE_DEPEND_SOURCE:
-	case OMP_CLAUSE_DEPEND_SINK:
-	  error_at (OMP_CLAUSE_LOCATION (clause),
-		    "%<depend(%s)%> is only allowed in %<omp ordered%>",
-		    OMP_CLAUSE_DEPEND_KIND (clause) == OMP_CLAUSE_DEPEND_SOURCE
-		    ? "source" : "sink");
-	  return;
 	case OMP_CLAUSE_DEPEND_IN:
 	case OMP_CLAUSE_DEPEND_OUT:
 	case OMP_CLAUSE_DEPEND_INOUT:
@@ -766,7 +768,7 @@ c_finish_omp_depobj (location_t loc, tree depobj,
 	}
     }
   else
-    gcc_assert (kind != OMP_CLAUSE_DEPEND_SOURCE);
+    gcc_assert (kind != OMP_CLAUSE_DEPEND_INVALID);
 
   if (depobj == error_mark_node)
     return;
diff --git a/gcc/c-family/c-pragma.h b/gcc/c-family/c-pragma.h
index f929e6a5258..2fb459a9872 100644
--- a/gcc/c-family/c-pragma.h
+++ b/gcc/c-family/c-pragma.h
@@ -109,6 +109,7 @@ enum pragma_omp_clause {
   PRAGMA_OMP_CLAUSE_DEVICE,
   PRAGMA_OMP_CLAUSE_DEVICE_TYPE,
   PRAGMA_OMP_CLAUSE_DIST_SCHEDULE,
+  PRAGMA_OMP_CLAUSE_DOACROSS,
   PRAGMA_OMP_CLAUSE_ENTER,
   PRAGMA_OMP_CLAUSE_FILTER,
   PRAGMA_OMP_CLAUSE_FINAL,
diff --git a/gcc/c/ChangeLog.omp b/gcc/c/ChangeLog.omp
index 6f8dae98e0c..32940146b60 100644
--- a/gcc/c/ChangeLog.omp
+++ b/gcc/c/ChangeLog.omp
@@ -1,3 +1,33 @@
+2022-09-05  Tobias Burnus  <tobias@codesourcery.com>
+
+	Backport from mainline:
+	2022-09-03  Jakub Jelinek  <jakub@redhat.com>
+
+	* c-parser.cc (c_parser_omp_clause_name): Handle doacross.
+	(c_parser_omp_clause_depend_sink): Renamed to ...
+	(c_parser_omp_clause_doacross_sink): ... this.  Add depend_p argument.
+	Handle parsing of doacross(sink:omp_cur_iteration-1).  Use
+	OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
+	OMP_CLAUSE_DEPEND_SINK_NEGATIVE, build OMP_CLAUSE_DOACROSS instead
+	of OMP_CLAUSE_DEPEND and set OMP_CLAUSE_DOACROSS_DEPEND flag on it.
+	(c_parser_omp_clause_depend): Use OMP_CLAUSE_DOACROSS_SINK and
+	OMP_CLAUSE_DOACROSS_SOURCE instead of OMP_CLAUSE_DEPEND_SINK and
+	OMP_CLAUSE_DEPEND_SOURCE, build OMP_CLAUSE_DOACROSS for depend(source)
+	and set OMP_CLAUSE_DOACROSS_DEPEND on it.
+	(c_parser_omp_clause_doacross): New function.
+	(c_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_DOACROSS.
+	(c_parser_omp_depobj): Use OMP_CLAUSE_DEPEND_INVALID instead of
+	OMP_CLAUSE_DEPEND_SOURCE.
+	(c_parser_omp_for_loop): Don't diagnose here linear clause together
+	with ordered with argument.
+	(c_parser_omp_simd): Don't diagnose ordered clause with argument on
+	for simd.
+	(OMP_ORDERED_DEPEND_CLAUSE_MASK): Add PRAGMA_OMP_CLAUSE_DOACROSS.
+	(c_parser_omp_ordered): Handle also doacross and adjust for it
+	diagnostic wording.
+	* c-typeck.cc (c_finish_omp_clauses): Handle OMP_CLAUSE_DOACROSS.
+	Don't handle OMP_CLAUSE_DEPEND_SOURCE and OMP_CLAUSE_DEPEND_SINK.
+
 2022-08-17  Tobias Burnus  <tobias@codesourcery.com>
 
 	Backport from mainline:
diff --git a/gcc/c/c-parser.cc b/gcc/c/c-parser.cc
index ce53667468c..70b72ad6fd7 100644
--- a/gcc/c/c-parser.cc
+++ b/gcc/c/c-parser.cc
@@ -12786,6 +12786,8 @@ c_parser_omp_clause_name (c_parser *parser)
 	    result = PRAGMA_OMP_CLAUSE_DEVICE_TYPE;
 	  else if (!strcmp ("dist_schedule", p))
 	    result = PRAGMA_OMP_CLAUSE_DIST_SCHEDULE;
+	  else if (!strcmp ("doacross", p))
+	    result = PRAGMA_OMP_CLAUSE_DOACROSS;
 	  break;
 	case 'e':
 	  if (!strcmp ("enter", p))
@@ -16148,8 +16150,8 @@ c_parser_omp_clause_simdlen (c_parser *parser, tree list)
 */
 
 static tree
-c_parser_omp_clause_depend_sink (c_parser *parser, location_t clause_loc,
-				 tree list)
+c_parser_omp_clause_doacross_sink (c_parser *parser, location_t clause_loc,
+				   tree list, bool depend_p)
 {
   tree vec = NULL;
   if (c_parser_next_token_is_not (parser, CPP_NAME)
@@ -16159,6 +16161,31 @@ c_parser_omp_clause_depend_sink (c_parser *parser, location_t clause_loc,
       return list;
     }
 
+  if (!depend_p)
+    {
+      const char *p = IDENTIFIER_POINTER (c_parser_peek_token (parser)->value);
+      if (strcmp (p, "omp_cur_iteration") == 0
+	  && c_parser_peek_2nd_token (parser)->type == CPP_MINUS
+	  && c_parser_peek_nth_token (parser, 3)->type == CPP_NUMBER
+	  && c_parser_peek_nth_token (parser, 4)->type == CPP_CLOSE_PAREN)
+	{
+	  tree val = c_parser_peek_nth_token (parser, 3)->value;
+	  if (integer_onep (val)
+	      && comptypes (TREE_TYPE (val), integer_type_node))
+	    {
+	      c_parser_consume_token (parser);
+	      c_parser_consume_token (parser);
+	      c_parser_consume_token (parser);
+	      tree u = build_omp_clause (clause_loc, OMP_CLAUSE_DOACROSS);
+	      OMP_CLAUSE_DOACROSS_KIND (u) = OMP_CLAUSE_DOACROSS_SINK;
+	      OMP_CLAUSE_CHAIN (u) = list;
+	      return u;
+	    }
+	}
+    }
+
+
+
   while (c_parser_next_token_is (parser, CPP_NAME)
 	 && c_parser_peek_token (parser)->id_kind == C_ID_ID)
     {
@@ -16204,7 +16231,7 @@ c_parser_omp_clause_depend_sink (c_parser *parser, location_t clause_loc,
 	{
 	  vec = tree_cons (addend, t, vec);
 	  if (neg)
-	    OMP_CLAUSE_DEPEND_SINK_NEGATIVE (vec) = 1;
+	    OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (vec) = 1;
 	}
 
       if (c_parser_next_token_is_not (parser, CPP_COMMA)
@@ -16218,8 +16245,9 @@ c_parser_omp_clause_depend_sink (c_parser *parser, location_t clause_loc,
   if (vec == NULL_TREE)
     return list;
 
-  tree u = build_omp_clause (clause_loc, OMP_CLAUSE_DEPEND);
-  OMP_CLAUSE_DEPEND_KIND (u) = OMP_CLAUSE_DEPEND_SINK;
+  tree u = build_omp_clause (clause_loc, OMP_CLAUSE_DOACROSS);
+  OMP_CLAUSE_DOACROSS_KIND (u) = OMP_CLAUSE_DOACROSS_SINK;
+  OMP_CLAUSE_DOACROSS_DEPEND (u) = depend_p;
   OMP_CLAUSE_DECL (u) = nreverse (vec);
   OMP_CLAUSE_CHAIN (u) = list;
   return u;
@@ -16411,6 +16439,7 @@ c_parser_omp_clause_depend (c_parser *parser, tree list)
 {
   location_t clause_loc = c_parser_peek_token (parser)->location;
   enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_LAST;
+  enum omp_clause_doacross_kind dkind = OMP_CLAUSE_DOACROSS_LAST;
   tree nl, c, iterators = NULL_TREE;
 
   matching_parens parens;
@@ -16442,9 +16471,9 @@ c_parser_omp_clause_depend (c_parser *parser, tree list)
       else if (strcmp ("depobj", p) == 0)
 	kind = OMP_CLAUSE_DEPEND_DEPOBJ;
       else if (strcmp ("sink", p) == 0)
-	kind = OMP_CLAUSE_DEPEND_SINK;
+	dkind = OMP_CLAUSE_DOACROSS_SINK;
       else if (strcmp ("source", p) == 0)
-	kind = OMP_CLAUSE_DEPEND_SOURCE;
+	dkind = OMP_CLAUSE_DOACROSS_SOURCE;
       else
 	goto invalid_kind;
       break;
@@ -16454,18 +16483,20 @@ c_parser_omp_clause_depend (c_parser *parser, tree list)
   c_parser_consume_token (parser);
 
   if (iterators
-      && (kind == OMP_CLAUSE_DEPEND_SOURCE || kind == OMP_CLAUSE_DEPEND_SINK))
+      && (dkind == OMP_CLAUSE_DOACROSS_SOURCE
+	  || dkind == OMP_CLAUSE_DOACROSS_SINK))
     {
       pop_scope ();
       error_at (clause_loc, "%<iterator%> modifier incompatible with %qs",
-		kind == OMP_CLAUSE_DEPEND_SOURCE ? "source" : "sink");
+		dkind == OMP_CLAUSE_DOACROSS_SOURCE ? "source" : "sink");
       iterators = NULL_TREE;
     }
 
-  if (kind == OMP_CLAUSE_DEPEND_SOURCE)
+  if (dkind == OMP_CLAUSE_DOACROSS_SOURCE)
     {
-      c = build_omp_clause (clause_loc, OMP_CLAUSE_DEPEND);
-      OMP_CLAUSE_DEPEND_KIND (c) = kind;
+      c = build_omp_clause (clause_loc, OMP_CLAUSE_DOACROSS);
+      OMP_CLAUSE_DOACROSS_KIND (c) = dkind;
+      OMP_CLAUSE_DOACROSS_DEPEND (c) = 1;
       OMP_CLAUSE_DECL (c) = NULL_TREE;
       OMP_CLAUSE_CHAIN (c) = list;
       parens.skip_until_found_close (parser);
@@ -16475,8 +16506,8 @@ c_parser_omp_clause_depend (c_parser *parser, tree list)
   if (!c_parser_require (parser, CPP_COLON, "expected %<:%>"))
     goto resync_fail;
 
-  if (kind == OMP_CLAUSE_DEPEND_SINK)
-    nl = c_parser_omp_clause_depend_sink (parser, clause_loc, list);
+  if (dkind == OMP_CLAUSE_DOACROSS_SINK)
+    nl = c_parser_omp_clause_doacross_sink (parser, clause_loc, list, true);
   else
     {
       nl = c_parser_omp_variable_list (parser, clause_loc,
@@ -16512,6 +16543,65 @@ c_parser_omp_clause_depend (c_parser *parser, tree list)
   return list;
 }
 
+/* OpenMP 5.2:
+   doacross ( source : )
+   doacross ( source : omp_cur_iteration )
+
+   doacross ( sink : vec )
+   doacross ( sink : omp_cur_iteration - logical_iteration )  */
+
+static tree
+c_parser_omp_clause_doacross (c_parser *parser, tree list)
+{
+  location_t clause_loc = c_parser_peek_token (parser)->location;
+  enum omp_clause_doacross_kind kind = OMP_CLAUSE_DOACROSS_LAST;
+  tree nl;
+  const char *p;
+
+  matching_parens parens;
+  if (!parens.require_open (parser))
+    return list;
+
+  if (c_parser_next_token_is_not (parser, CPP_NAME))
+    goto invalid_kind;
+
+  p = IDENTIFIER_POINTER (c_parser_peek_token (parser)->value);
+  if (strcmp ("sink", p) == 0)
+    kind = OMP_CLAUSE_DOACROSS_SINK;
+  else if (strcmp ("source", p) == 0)
+    kind = OMP_CLAUSE_DOACROSS_SOURCE;
+  else
+    goto invalid_kind;
+
+  c_parser_consume_token (parser);
+
+  if (!c_parser_require (parser, CPP_COLON, "expected %<:%>"))
+    goto resync_fail;
+
+  if (kind == OMP_CLAUSE_DOACROSS_SOURCE)
+    {
+      if (c_parser_next_token_is (parser, CPP_NAME)
+	  && strcmp (IDENTIFIER_POINTER (c_parser_peek_token (parser)->value),
+		     "omp_cur_iteration") == 0)
+	c_parser_consume_token (parser);
+      nl = build_omp_clause (clause_loc, OMP_CLAUSE_DOACROSS);
+      OMP_CLAUSE_DOACROSS_KIND (nl) = OMP_CLAUSE_DOACROSS_SOURCE;
+      OMP_CLAUSE_DECL (nl) = NULL_TREE;
+      OMP_CLAUSE_CHAIN (nl) = list;
+    }
+  else
+    nl = c_parser_omp_clause_doacross_sink (parser, clause_loc, list, false);
+
+  parens.skip_until_found_close (parser);
+  return nl;
+
+ invalid_kind:
+  c_parser_error (parser, "invalid doacross kind");
+ resync_fail:
+  parens.skip_until_found_close (parser);
+  return list;
+}
+
 /* OpenMP 4.0:
    map ( map-kind: variable-list )
    map ( variable-list )
@@ -17435,6 +17525,10 @@ c_parser_omp_all_clauses (c_parser *parser, omp_clause_mask mask,
 	  clauses = c_parser_omp_clause_depend (parser, clauses);
 	  c_name = "depend";
 	  break;
+	case PRAGMA_OMP_CLAUSE_DOACROSS:
+	  clauses = c_parser_omp_clause_doacross (parser, clauses);
+	  c_name = "doacross";
+	  break;
 	case PRAGMA_OMP_CLAUSE_MAP:
 	  clauses = c_parser_omp_clause_map (parser, clauses);
 	  c_name = "map";
@@ -19383,7 +19477,7 @@ c_parser_omp_depobj (c_parser *parser)
 
   parens.skip_until_found_close (parser);
   tree clause = NULL_TREE;
-  enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_SOURCE;
+  enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_INVALID;
   location_t c_loc = c_parser_peek_token (parser)->location;
   if (c_parser_next_token_is (parser, CPP_NAME))
     {
@@ -19422,7 +19516,7 @@ c_parser_omp_depobj (c_parser *parser)
 		  else if (!strcmp ("inoutset", p2))
 		    kind = OMP_CLAUSE_DEPEND_INOUTSET;
 		}
-	      if (kind == OMP_CLAUSE_DEPEND_SOURCE)
+	      if (kind == OMP_CLAUSE_DEPEND_INVALID)
 		{
 		  clause = error_mark_node;
 		  error_at (c2_loc, "expected %<in%>, %<out%>, %<inout%>, "
@@ -19434,7 +19528,7 @@ c_parser_omp_depobj (c_parser *parser)
 	    clause = error_mark_node;
 	}
     }
-  if (!clause && kind == OMP_CLAUSE_DEPEND_SOURCE)
+  if (!clause && kind == OMP_CLAUSE_DEPEND_INVALID)
     {
       clause = error_mark_node;
       error_at (c_loc, "expected %<depend%>, %<destroy%> or %<update%> clause");
@@ -19634,19 +19728,6 @@ c_parser_omp_for_loop (location_t loc, c_parser *parser, enum tree_code code,
 	= build_int_cst (NULL_TREE, collapse);
       ordered = collapse;
     }
-  if (ordered)
-    {
-      for (tree *pc = &clauses; *pc; )
-	if (OMP_CLAUSE_CODE (*pc) == OMP_CLAUSE_LINEAR)
-	  {
-	    error_at (OMP_CLAUSE_LOCATION (*pc),
-		      "%<linear%> clause may not be specified together "
-		      "with %<ordered%> clause with a parameter");
-	    *pc = OMP_CLAUSE_CHAIN (*pc);
-	  }
-	else
-	  pc = &OMP_CLAUSE_CHAIN (*pc);
-    }
 
   gcc_assert (tiling || (collapse >= 1 && ordered >= 0));
   count = ordered ? ordered : collapse;
@@ -20084,15 +20165,6 @@ c_parser_omp_simd (location_t loc, c_parser *parser,
     {
       omp_split_clauses (loc, OMP_SIMD, mask, clauses, cclauses);
       clauses = cclauses[C_OMP_CLAUSE_SPLIT_SIMD];
-      tree c = omp_find_clause (cclauses[C_OMP_CLAUSE_SPLIT_FOR],
-				OMP_CLAUSE_ORDERED);
-      if (c && OMP_CLAUSE_ORDERED_EXPR (c))
-	{
-	  error_at (OMP_CLAUSE_LOCATION (c),
-		    "%<ordered%> clause with parameter may not be specified "
-		    "on %qs construct", p_name);
-	  OMP_CLAUSE_ORDERED_EXPR (c) = NULL_TREE;
-	}
     }
 
   block = c_begin_compound_stmt (true);
@@ -20331,14 +20403,18 @@ c_parser_omp_masked (location_t loc, c_parser *parser,
    # pragma omp ordered ordered-clauses new-line
      structured-block
 
-   # pragma omp ordered depend-clauses new-line  */
+   # pragma omp ordered depend-clauses new-line
+
+   OpenMP 5.2
+   # pragma omp ordered doacross-clauses new-line  */
 
 #define OMP_ORDERED_CLAUSE_MASK					\
 	( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_THREADS)	\
 	| (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SIMD))
 
 #define OMP_ORDERED_DEPEND_CLAUSE_MASK				\
-	(OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND)
+	( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND)	\
+	| (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DOACROSS))
 
 static bool
 c_parser_omp_ordered (c_parser *parser, enum pragma_context context,
@@ -20358,7 +20434,7 @@ c_parser_omp_ordered (c_parser *parser, enum pragma_context context,
     {
       const char *p = IDENTIFIER_POINTER (c_parser_peek_token (parser)->value);
 
-      if (!strcmp ("depend", p))
+      if (!strcmp ("depend", p) || !strcmp ("doacross", p))
 	{
 	  if (!flag_openmp)	/* flag_openmp_simd  */
 	    {
@@ -20368,8 +20444,8 @@ c_parser_omp_ordered (c_parser *parser, enum pragma_context context,
 	  if (context == pragma_stmt)
 	    {
 	      error_at (loc,
-			"%<#pragma omp ordered%> with %<depend%> clause may "
-			"only be used in compound statements");
+			"%<#pragma omp ordered%> with %qs clause may "
+			"only be used in compound statements", p);
 	      c_parser_skip_to_pragma_eol (parser, false);
 	      return true;
 	    }
diff --git a/gcc/c/c-typeck.cc b/gcc/c/c-typeck.cc
index c1852586cd8..7d855e73630 100644
--- a/gcc/c/c-typeck.cc
+++ b/gcc/c/c-typeck.cc
@@ -14960,15 +14960,11 @@ c_finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	      continue;
 	    }
 
-	case OMP_CLAUSE_DEPEND:
+	case OMP_CLAUSE_DOACROSS:
 	  t = OMP_CLAUSE_DECL (c);
 	  if (t == NULL_TREE)
-	    {
-	      gcc_assert (OMP_CLAUSE_DEPEND_KIND (c)
-			  == OMP_CLAUSE_DEPEND_SOURCE);
-	      break;
-	    }
-	  if (OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SINK)
+	    break;
+	  if (OMP_CLAUSE_DOACROSS_KIND (c) == OMP_CLAUSE_DOACROSS_SINK)
 	    {
 	      gcc_assert (TREE_CODE (t) == TREE_LIST);
 	      for (; t; t = TREE_CHAIN (t))
@@ -14996,7 +14992,8 @@ c_finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 		}
 	      break;
 	    }
-	  /* FALLTHRU */
+	  gcc_unreachable ();
+	case OMP_CLAUSE_DEPEND:
 	case OMP_CLAUSE_AFFINITY:
 	  t = OMP_CLAUSE_DECL (c);
 	  if (TREE_CODE (t) == TREE_LIST
diff --git a/gcc/cp/ChangeLog.omp b/gcc/cp/ChangeLog.omp
index b122ac07ef9..07e7be2f819 100644
--- a/gcc/cp/ChangeLog.omp
+++ b/gcc/cp/ChangeLog.omp
@@ -1,3 +1,41 @@
+2022-09-05  Tobias Burnus  <tobias@codesourcery.com>
+
+	Backport from mainline:
+	2022-09-03  Jakub Jelinek  <jakub@redhat.com>
+
+	* parser.cc (cp_parser_omp_clause_name): Handle doacross.
+	(cp_parser_omp_clause_depend_sink): Renamed to ...
+	(cp_parser_omp_clause_doacross_sink): ... this.  Add depend_p
+	argument.  Handle parsing of doacross(sink:omp_cur_iteration-1).  Use
+	OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
+	OMP_CLAUSE_DEPEND_SINK_NEGATIVE, build OMP_CLAUSE_DOACROSS instead
+	of OMP_CLAUSE_DEPEND and set OMP_CLAUSE_DOACROSS_DEPEND flag on it.
+	(cp_parser_omp_clause_depend): Use OMP_CLAUSE_DOACROSS_SINK and
+	OMP_CLAUSE_DOACROSS_SOURCE instead of OMP_CLAUSE_DEPEND_SINK and
+	OMP_CLAUSE_DEPEND_SOURCE, build OMP_CLAUSE_DOACROSS for depend(source)
+	and set OMP_CLAUSE_DOACROSS_DEPEND on it.
+	(cp_parser_omp_clause_doacross): New function.
+	(cp_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_DOACROSS.
+	(cp_parser_omp_depobj): Use OMP_CLAUSE_DEPEND_INVALID instead of
+	OMP_CLAUSE_DEPEND_SOURCE.
+	(cp_parser_omp_for_loop): Don't diagnose here linear clause together
+	with ordered with argument.
+	(cp_parser_omp_simd): Don't diagnose ordered clause with argument on
+	for simd.
+	(OMP_ORDERED_DEPEND_CLAUSE_MASK): Add PRAGMA_OMP_CLAUSE_DOACROSS.
+	(cp_parser_omp_ordered): Handle also doacross and adjust for it
+	diagnostic wording.
+	* pt.cc (tsubst_omp_clause_decl): Use
+	OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
+	OMP_CLAUSE_DEPEND_SINK_NEGATIVE.
+	(tsubst_omp_clauses): Handle OMP_CLAUSE_DOACROSS.
+	(tsubst_expr): Use OMP_CLAUSE_DEPEND_INVALID instead of
+	OMP_CLAUSE_DEPEND_SOURCE.
+	* semantics.cc (cp_finish_omp_clause_depend_sink): Rename to ...
+	(cp_finish_omp_clause_doacross_sink): ... this.
+	(finish_omp_clauses): Handle OMP_CLAUSE_DOACROSS.  Don't handle
+	OMP_CLAUSE_DEPEND_SOURCE and OMP_CLAUSE_DEPEND_SINK.
+
 2022-08-17  Tobias Burnus  <tobias@codesourcery.com>
 
 	Backport from mainline:
diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index 618dfdb8f9b..4c82ad150a2 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -11912,14 +11912,18 @@ cp_parser_handle_statement_omp_attributes (cp_parser *parser, tree attrs)
 	    if (dir->id == PRAGMA_OMP_ORDERED)
 	      {
 		/* ordered is C_OMP_DIR_CONSTRUCT only if it doesn't contain
-		   depend clause.  */
-		if (directive[1] && strcmp (directive[1], "depend") == 0)
+		   depend/doacross clause.  */
+		if (directive[1]
+		    && (strcmp (directive[1], "depend") == 0
+			|| strcmp (directive[1], "doacross") == 0))
 		  kind = C_OMP_DIR_STANDALONE;
 		else if (first + 2 < last
 			 && first[1].type == CPP_COMMA
 			 && first[2].type == CPP_NAME
-			 && strcmp (IDENTIFIER_POINTER (first[2].u.value),
-				    "depend") == 0)
+			 && (strcmp (IDENTIFIER_POINTER (first[2].u.value),
+				     "depend") == 0
+			     || strcmp (IDENTIFIER_POINTER (first[2].u.value),
+					"doacross") == 0))
 		  kind = C_OMP_DIR_STANDALONE;
 	      }
 	    else if (dir->id == PRAGMA_OMP_ERROR)
@@ -36369,6 +36373,8 @@ cp_parser_omp_clause_name (cp_parser *parser)
 	    result = PRAGMA_OMP_CLAUSE_DEVICE_TYPE;
 	  else if (!strcmp ("dist_schedule", p))
 	    result = PRAGMA_OMP_CLAUSE_DIST_SCHEDULE;
+	  else if (!strcmp ("doacross", p))
+	    result = PRAGMA_OMP_CLAUSE_DOACROSS;
 	  break;
 	case 'e':
 	  if (!strcmp ("enter", p))
@@ -39328,8 +39334,8 @@ cp_parser_omp_clause_simdlen (cp_parser *parser, tree list,
 */
 
 static tree
-cp_parser_omp_clause_depend_sink (cp_parser *parser, location_t clause_loc,
-				  tree list)
+cp_parser_omp_clause_doacross_sink (cp_parser *parser, location_t clause_loc,
+				    tree list, bool depend_p)
 {
   tree vec = NULL;
 
@@ -39339,6 +39345,29 @@ cp_parser_omp_clause_depend_sink (cp_parser *parser, location_t clause_loc,
       return list;
     }
 
+  if (!depend_p)
+    {
+      tree id = cp_lexer_peek_token (parser->lexer)->u.value;
+      if (strcmp (IDENTIFIER_POINTER (id), "omp_cur_iteration") == 0
+	  && cp_lexer_nth_token_is (parser->lexer, 2, CPP_MINUS)
+	  && cp_lexer_nth_token_is (parser->lexer, 3, CPP_NUMBER)
+	  && cp_lexer_nth_token_is (parser->lexer, 4, CPP_CLOSE_PAREN))
+	{
+	  tree val = cp_lexer_peek_nth_token (parser->lexer, 3)->u.value;
+	  if (integer_onep (val)
+	      && same_type_p (TREE_TYPE (val), integer_type_node))
+	    {
+	      cp_lexer_consume_token (parser->lexer);
+	      cp_lexer_consume_token (parser->lexer);
+	      cp_lexer_consume_token (parser->lexer);
+	      tree u = build_omp_clause (clause_loc, OMP_CLAUSE_DOACROSS);
+	      OMP_CLAUSE_DOACROSS_KIND (u) = OMP_CLAUSE_DOACROSS_SINK;
+	      OMP_CLAUSE_CHAIN (u) = list;
+	      return u;
+	    }
+	}
+    }
+
   while (cp_lexer_next_token_is (parser->lexer, CPP_NAME))
     {
       location_t id_loc = cp_lexer_peek_token (parser->lexer)->location;
@@ -39386,7 +39415,7 @@ cp_parser_omp_clause_depend_sink (cp_parser *parser, location_t clause_loc,
 	{
 	  vec = tree_cons (addend, t, vec);
 	  if (neg)
-	    OMP_CLAUSE_DEPEND_SINK_NEGATIVE (vec) = 1;
+	    OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (vec) = 1;
 	}
 
       if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)
@@ -39398,8 +39427,9 @@ cp_parser_omp_clause_depend_sink (cp_parser *parser, location_t clause_loc,
 
   if (vec)
     {
-      tree u = build_omp_clause (clause_loc, OMP_CLAUSE_DEPEND);
-      OMP_CLAUSE_DEPEND_KIND (u) = OMP_CLAUSE_DEPEND_SINK;
+      tree u = build_omp_clause (clause_loc, OMP_CLAUSE_DOACROSS);
+      OMP_CLAUSE_DOACROSS_KIND (u) = OMP_CLAUSE_DOACROSS_SINK;
+      OMP_CLAUSE_DOACROSS_DEPEND (u) = depend_p;
       OMP_CLAUSE_DECL (u) = nreverse (vec);
       OMP_CLAUSE_CHAIN (u) = list;
       return u;
@@ -39648,6 +39678,7 @@ cp_parser_omp_clause_depend (cp_parser *parser, tree list, location_t loc)
 {
   tree nlist, c, iterators = NULL_TREE;
   enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_LAST;
+  enum omp_clause_doacross_kind dkind = OMP_CLAUSE_DOACROSS_LAST;
 
   matching_parens parens;
   if (!parens.require_open (parser))
@@ -39681,9 +39712,9 @@ cp_parser_omp_clause_depend (cp_parser *parser, tree list, location_t loc)
       else if (strcmp ("depobj", p) == 0)
 	kind = OMP_CLAUSE_DEPEND_DEPOBJ;
       else if (strcmp ("sink", p) == 0)
-	kind = OMP_CLAUSE_DEPEND_SINK;
+	dkind = OMP_CLAUSE_DOACROSS_SINK;
       else if (strcmp ("source", p) == 0)
-	kind = OMP_CLAUSE_DEPEND_SOURCE;
+	dkind = OMP_CLAUSE_DOACROSS_SOURCE;
       else
 	goto invalid_kind;
       break;
@@ -39693,18 +39724,20 @@ cp_parser_omp_clause_depend (cp_parser *parser, tree list, location_t loc)
   cp_lexer_consume_token (parser->lexer);
 
   if (iterators
-      && (kind == OMP_CLAUSE_DEPEND_SOURCE || kind == OMP_CLAUSE_DEPEND_SINK))
+      && (dkind == OMP_CLAUSE_DOACROSS_SOURCE
+	  || dkind == OMP_CLAUSE_DOACROSS_SINK))
     {
       poplevel (0, 1, 0);
       error_at (loc, "%<iterator%> modifier incompatible with %qs",
-		kind == OMP_CLAUSE_DEPEND_SOURCE ? "source" : "sink");
+		dkind == OMP_CLAUSE_DOACROSS_SOURCE ? "source" : "sink");
       iterators = NULL_TREE;
     }
 
-  if (kind == OMP_CLAUSE_DEPEND_SOURCE)
+  if (dkind == OMP_CLAUSE_DOACROSS_SOURCE)
     {
-      c = build_omp_clause (loc, OMP_CLAUSE_DEPEND);
-      OMP_CLAUSE_DEPEND_KIND (c) = kind;
+      c = build_omp_clause (loc, OMP_CLAUSE_DOACROSS);
+      OMP_CLAUSE_DOACROSS_KIND (c) = dkind;
+      OMP_CLAUSE_DOACROSS_DEPEND (c) = 1;
       OMP_CLAUSE_DECL (c) = NULL_TREE;
       OMP_CLAUSE_CHAIN (c) = list;
       if (!parens.require_close (parser))
@@ -39717,9 +39750,9 @@ cp_parser_omp_clause_depend (cp_parser *parser, tree list, location_t loc)
   if (!cp_parser_require (parser, CPP_COLON, RT_COLON))
     goto resync_fail;
 
-  if (kind == OMP_CLAUSE_DEPEND_SINK)
+  if (dkind == OMP_CLAUSE_DOACROSS_SINK)
     {
-      nlist = cp_parser_omp_clause_depend_sink (parser, loc, list);
+      nlist = cp_parser_omp_clause_doacross_sink (parser, loc, list, true);
       if (!parens.require_close (parser))
 	cp_parser_skip_to_closing_parenthesis (parser, /*recovering=*/true,
 					       /*or_comma=*/false,
@@ -39760,6 +39793,73 @@ cp_parser_omp_clause_depend (cp_parser *parser, tree list, location_t loc)
   return list;
 }
 
+/* OpenMP 5.2:
+   doacross ( source : )
+   doacross ( source : omp_cur_iteration )
+
+   doacross ( sink : vec )
+   doacross ( sink : omp_cur_iteration - logical_iteration )  */
+
+static tree
+cp_parser_omp_clause_doacross (cp_parser *parser, tree list, location_t loc)
+{
+  tree nlist;
+  enum omp_clause_doacross_kind kind = OMP_CLAUSE_DOACROSS_LAST;
+
+  matching_parens parens;
+  if (!parens.require_open (parser))
+    return list;
+
+  if (cp_lexer_next_token_is_not (parser->lexer, CPP_NAME))
+    {
+    invalid_kind:
+      cp_parser_error (parser, "invalid doacross kind");
+    resync_fail:
+      cp_parser_skip_to_closing_parenthesis (parser, /*recovering=*/true,
+					     /*or_comma=*/false,
+					     /*consume_paren=*/true);
+      return list;
+    }
+
+  tree id = cp_lexer_peek_token (parser->lexer)->u.value;
+  const char *p = IDENTIFIER_POINTER (id);
+
+  if (strcmp ("sink", p) == 0)
+    kind = OMP_CLAUSE_DOACROSS_SINK;
+  else if (strcmp ("source", p) == 0)
+    kind = OMP_CLAUSE_DOACROSS_SOURCE;
+  else
+    goto invalid_kind;
+
+  cp_lexer_consume_token (parser->lexer);
+
+  if (!cp_parser_require (parser, CPP_COLON, RT_COLON))
+    goto resync_fail;
+
+  if (kind == OMP_CLAUSE_DOACROSS_SOURCE)
+    {
+      if (cp_lexer_next_token_is (parser->lexer, CPP_NAME))
+	{
+	  id = cp_lexer_peek_token (parser->lexer)->u.value;
+	  p = IDENTIFIER_POINTER (id);
+	  if (strcmp (p, "omp_cur_iteration") == 0)
+	    cp_lexer_consume_token (parser->lexer);
+	}
+      nlist = build_omp_clause (loc, OMP_CLAUSE_DOACROSS);
+      OMP_CLAUSE_DOACROSS_KIND (nlist) = OMP_CLAUSE_DOACROSS_SOURCE;
+      OMP_CLAUSE_DECL (nlist) = NULL_TREE;
+      OMP_CLAUSE_CHAIN (nlist) = list;
+    }
+  else
+    nlist = cp_parser_omp_clause_doacross_sink (parser, loc, list, false);
+
+  if (!parens.require_close (parser))
+    cp_parser_skip_to_closing_parenthesis (parser, /*recovering=*/true,
+					   /*or_comma=*/false,
+					   /*consume_paren=*/true);
+  return nlist;
+}
+
 /* OpenMP 4.0:
    map ( map-kind : variable-list )
    map ( variable-list )
@@ -40706,6 +40806,11 @@ cp_parser_omp_all_clauses (cp_parser *parser, omp_clause_mask mask,
 						 token->location);
 	  c_name = "depend";
 	  break;
+	case PRAGMA_OMP_CLAUSE_DOACROSS:
+	  clauses = cp_parser_omp_clause_doacross (parser, clauses,
+						   token->location);
+	  c_name = "doacross";
+	  break;
 	case PRAGMA_OMP_CLAUSE_DETACH:
 	  clauses = cp_parser_omp_clause_detach (parser, clauses);
 	  c_name = "detach";
@@ -41944,7 +42049,7 @@ cp_parser_omp_depobj (cp_parser *parser, cp_token *pragma_tok)
 					   /*consume_paren=*/true);
 
   tree clause = NULL_TREE;
-  enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_SOURCE;
+  enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_INVALID;
   location_t c_loc = cp_lexer_peek_token (parser->lexer)->location;
   /* For now only in C++ attributes, do it always for OpenMP 5.1.  */
   if (parser->lexer->in_omp_attribute_pragma
@@ -41992,7 +42097,7 @@ cp_parser_omp_depobj (cp_parser *parser, cp_token *pragma_tok)
 		  else if (!strcmp ("inoutset", p2))
 		    kind = OMP_CLAUSE_DEPEND_INOUTSET;
 		}
-	      if (kind == OMP_CLAUSE_DEPEND_SOURCE)
+	      if (kind == OMP_CLAUSE_DEPEND_INVALID)
 		{
 		  clause = error_mark_node;
 		  error_at (c2_loc, "expected %<in%>, %<out%>, %<inout%>, "
@@ -42008,7 +42113,7 @@ cp_parser_omp_depobj (cp_parser *parser, cp_token *pragma_tok)
 	    clause = error_mark_node;
 	}
     }
-  if (!clause && kind == OMP_CLAUSE_DEPEND_SOURCE)
+  if (!clause && kind == OMP_CLAUSE_DEPEND_INVALID)
     {
       clause = error_mark_node;
       error_at (c_loc, "expected %<depend%>, %<destroy%> or %<update%> clause");
@@ -42840,19 +42945,6 @@ cp_parser_omp_for_loop (cp_parser *parser, enum tree_code code, tree clauses,
 	= build_int_cst (NULL_TREE, collapse);
       ordered = collapse;
     }
-  if (ordered)
-    {
-      for (tree *pc = &clauses; *pc; )
-	if (OMP_CLAUSE_CODE (*pc) == OMP_CLAUSE_LINEAR)
-	  {
-	    error_at (OMP_CLAUSE_LOCATION (*pc),
-		      "%<linear%> clause may not be specified together "
-		      "with %<ordered%> clause with a parameter");
-	    *pc = OMP_CLAUSE_CHAIN (*pc);
-	  }
-	else
-	  pc = &OMP_CLAUSE_CHAIN (*pc);
-    }
 
   gcc_assert (tiling || (collapse >= 1 && ordered >= 0));
   count = ordered ? ordered : collapse;
@@ -43304,15 +43396,6 @@ cp_parser_omp_simd (cp_parser *parser, cp_token *pragma_tok,
     {
       cp_omp_split_clauses (loc, OMP_SIMD, mask, clauses, cclauses);
       clauses = cclauses[C_OMP_CLAUSE_SPLIT_SIMD];
-      tree c = omp_find_clause (cclauses[C_OMP_CLAUSE_SPLIT_FOR],
-				OMP_CLAUSE_ORDERED);
-      if (c && OMP_CLAUSE_ORDERED_EXPR (c))
-	{
-	  error_at (OMP_CLAUSE_LOCATION (c),
-		    "%<ordered%> clause with parameter may not be specified "
-		    "on %qs construct", p_name);
-	  OMP_CLAUSE_ORDERED_EXPR (c) = NULL_TREE;
-	}
     }
 
   keep_next_level (true);
@@ -43574,7 +43657,8 @@ cp_parser_omp_masked (cp_parser *parser, cp_token *pragma_tok,
 	| (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_SIMD))
 
 #define OMP_ORDERED_DEPEND_CLAUSE_MASK				\
-	(OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND)
+	( (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DEPEND)	\
+	| (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DOACROSS))
 
 static bool
 cp_parser_omp_ordered (cp_parser *parser, cp_token *pragma_tok,
@@ -43593,7 +43677,7 @@ cp_parser_omp_ordered (cp_parser *parser, cp_token *pragma_tok,
       tree id = cp_lexer_peek_nth_token (parser->lexer, n)->u.value;
       const char *p = IDENTIFIER_POINTER (id);
 
-      if (strcmp (p, "depend") == 0)
+      if (strcmp (p, "depend") == 0 || strcmp (p, "doacross") == 0)
 	{
 	  if (!flag_openmp)	/* flag_openmp_simd */
 	    {
@@ -43603,8 +43687,8 @@ cp_parser_omp_ordered (cp_parser *parser, cp_token *pragma_tok,
 	  if (context == pragma_stmt)
 	    {
 	      error_at (pragma_tok->location, "%<#pragma omp ordered%> with "
-			"%<depend%> clause may only be used in compound "
-			"statements");
+			"%qs clause may only be used in compound "
+			"statements", p);
 	      cp_parser_skip_to_pragma_eol (parser, pragma_tok);
 	      return true;
 	    }
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index 7b4ce3fae02..42fc7e97461 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -17717,8 +17717,8 @@ tsubst_omp_clause_decl (tree decl, tree args, tsubst_flags_t complain,
     }
 
   /* Handle an OpenMP array section represented as a TREE_LIST (or
-     OMP_CLAUSE_DEPEND_KIND).  An OMP_CLAUSE_DEPEND (with a depend
-     kind of OMP_CLAUSE_DEPEND_SINK) can also be represented as a
+     OMP_CLAUSE_DOACROSS_KIND).  An OMP_CLAUSE_DOACROSS (with a depend
+     kind of OMP_CLAUSE_DOACROSS_SINK) can also be represented as a
      TREE_LIST.  We can handle it exactly the same as an array section
      (purpose, value, and a chain), even though the nomenclature
      (low_bound, length, etc) is different.  */
@@ -17736,8 +17736,8 @@ tsubst_omp_clause_decl (tree decl, tree args, tsubst_flags_t complain,
 	  && TREE_CHAIN (decl) == chain)
 	return decl;
       tree ret = tree_cons (low_bound, length, chain);
-      OMP_CLAUSE_DEPEND_SINK_NEGATIVE (ret)
-	= OMP_CLAUSE_DEPEND_SINK_NEGATIVE (decl);
+      OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (ret)
+	= OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (decl);
       return ret;
     }
   tree ret = tsubst_expr (decl, args, complain, in_decl,
@@ -17785,6 +17785,7 @@ tsubst_omp_clauses (tree clauses, enum c_omp_region_type ort,
 	case OMP_CLAUSE_COPYPRIVATE:
 	case OMP_CLAUSE_UNIFORM:
 	case OMP_CLAUSE_DEPEND:
+	case OMP_CLAUSE_DOACROSS:
 	case OMP_CLAUSE_AFFINITY:
 	case OMP_CLAUSE_FROM:
 	case OMP_CLAUSE_TO:
@@ -19273,7 +19274,7 @@ tsubst_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl,
       r = RECUR (OMP_DEPOBJ_DEPOBJ (t));
       if (OMP_DEPOBJ_CLAUSES (t) && OMP_DEPOBJ_CLAUSES (t) != error_mark_node)
 	{
-	  enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_SOURCE;
+	  enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_INVALID;
 	  if (TREE_CODE (OMP_DEPOBJ_CLAUSES (t)) == OMP_CLAUSE)
 	    {
 	      tmp = tsubst_omp_clauses (OMP_DEPOBJ_CLAUSES (t), C_ORT_OMP,
@@ -19291,7 +19292,7 @@ tsubst_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl,
 	}
       else
 	finish_omp_depobj (EXPR_LOCATION (t), r,
-			   OMP_CLAUSE_DEPEND_SOURCE,
+			   OMP_CLAUSE_DEPEND_INVALID,
 			   OMP_DEPOBJ_CLAUSES (t));
       break;
 
diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index 85ec4807dc8..7717a820f0d 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -6528,13 +6528,13 @@ finish_omp_declare_simd_methods (tree t)
     }
 }
 
-/* Adjust sink depend clause to take into account pointer offsets.
+/* Adjust sink depend/doacross clause to take into account pointer offsets.
 
    Return TRUE if there was a problem processing the offset, and the
    whole clause should be removed.  */
 
 static bool
-cp_finish_omp_clause_depend_sink (tree sink_clause)
+cp_finish_omp_clause_doacross_sink (tree sink_clause)
 {
   tree t = OMP_CLAUSE_DECL (sink_clause);
   gcc_assert (TREE_CODE (t) == TREE_LIST);
@@ -7966,21 +7966,18 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	      continue;
 	    }
 
-	case OMP_CLAUSE_DEPEND:
+	case OMP_CLAUSE_DOACROSS:
 	  t = OMP_CLAUSE_DECL (c);
 	  if (t == NULL_TREE)
+	    break;
+	  if (OMP_CLAUSE_DOACROSS_KIND (c) == OMP_CLAUSE_DOACROSS_SINK)
 	    {
-	      gcc_assert (OMP_CLAUSE_DEPEND_KIND (c)
-			  == OMP_CLAUSE_DEPEND_SOURCE);
-	      break;
-	    }
-	  if (OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SINK)
-	    {
-	      if (cp_finish_omp_clause_depend_sink (c))
+	      if (cp_finish_omp_clause_doacross_sink (c))
 		remove = true;
 	      break;
 	    }
-	  /* FALLTHRU */
+	  gcc_unreachable ();
+	case OMP_CLAUSE_DEPEND:
 	case OMP_CLAUSE_AFFINITY:
 	  t = OMP_CLAUSE_DECL (c);
 	  if (TREE_CODE (t) == TREE_LIST
diff --git a/gcc/fortran/ChangeLog.omp b/gcc/fortran/ChangeLog.omp
index f623b7201bb..84aefdad573 100644
--- a/gcc/fortran/ChangeLog.omp
+++ b/gcc/fortran/ChangeLog.omp
@@ -1,3 +1,14 @@
+2022-09-05  Tobias Burnus  <tobias@codesourcery.com>
+
+	Backport from mainline:
+	2022-09-03  Jakub Jelinek  <jakub@redhat.com>
+
+	* trans-openmp.cc (gfc_trans_omp_clauses): Use
+	OMP_CLAUSE_DOACROSS_SINK_NEGATIVE instead of
+	OMP_CLAUSE_DEPEND_SINK_NEGATIVE, build OMP_CLAUSE_DOACROSS
+	clause instead of OMP_CLAUSE_DEPEND and set OMP_CLAUSE_DOACROSS_DEPEND
+	on it.
+
 2022-08-30  Tobias Burnus  <tobias@codesourcery.com>
 
 	Backport from mainline:
diff --git a/gcc/fortran/trans-openmp.cc b/gcc/fortran/trans-openmp.cc
index 31ad6255f24..a4d75b19921 100644
--- a/gcc/fortran/trans-openmp.cc
+++ b/gcc/fortran/trans-openmp.cc
@@ -4292,7 +4292,7 @@ gfc_trans_omp_clauses (stmtblock_t *block, gfc_omp_clauses *clauses,
 			    }
 			  vec = tree_cons (addend, t, vec);
 			  if (neg)
-			    OMP_CLAUSE_DEPEND_SINK_NEGATIVE (vec) = 1;
+			    OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (vec) = 1;
 			}
 		      if (n->next == NULL
 			  || n->next->u.depend_op != OMP_DEPEND_SINK)
@@ -4303,8 +4303,9 @@ gfc_trans_omp_clauses (stmtblock_t *block, gfc_omp_clauses *clauses,
 		    continue;
 
 		  tree node = build_omp_clause (input_location,
-						OMP_CLAUSE_DEPEND);
-		  OMP_CLAUSE_DEPEND_KIND (node) = OMP_CLAUSE_DEPEND_SINK;
+						OMP_CLAUSE_DOACROSS);
+		  OMP_CLAUSE_DOACROSS_KIND (node) = OMP_CLAUSE_DOACROSS_SINK;
+		  OMP_CLAUSE_DOACROSS_DEPEND (node) = 1;
 		  OMP_CLAUSE_DECL (node) = nreverse (vec);
 		  omp_clauses = gfc_trans_add_clause (node, omp_clauses);
 		  continue;
@@ -5763,8 +5764,9 @@ gfc_trans_omp_clauses (stmtblock_t *block, gfc_omp_clauses *clauses,
 
   if (clauses->depend_source)
     {
-      c = build_omp_clause (gfc_get_location (&where), OMP_CLAUSE_DEPEND);
-      OMP_CLAUSE_DEPEND_KIND (c) = OMP_CLAUSE_DEPEND_SOURCE;
+      c = build_omp_clause (gfc_get_location (&where), OMP_CLAUSE_DOACROSS);
+      OMP_CLAUSE_DOACROSS_KIND (c) = OMP_CLAUSE_DOACROSS_SOURCE;
+      OMP_CLAUSE_DOACROSS_DEPEND (c) = 1;
       omp_clauses = gfc_trans_add_clause (c, omp_clauses);
     }
 
diff --git a/gcc/gimplify.cc b/gcc/gimplify.cc
index 6b0ec75f01a..493a42eff4f 100644
--- a/gcc/gimplify.cc
+++ b/gcc/gimplify.cc
@@ -8330,9 +8330,6 @@ gimplify_omp_depend (tree *list_p, gimple_seq *pre_p)
 	  case OMP_CLAUSE_DEPEND_INOUTSET:
 	    i = 4;
 	    break;
-	  case OMP_CLAUSE_DEPEND_SOURCE:
-	  case OMP_CLAUSE_DEPEND_SINK:
-	    continue;
 	  default:
 	    gcc_unreachable ();
 	  }
@@ -8571,9 +8568,6 @@ gimplify_omp_depend (tree *list_p, gimple_seq *pre_p)
 	  case OMP_CLAUSE_DEPEND_INOUTSET:
 	    i = 4;
 	    break;
-	  case OMP_CLAUSE_DEPEND_SOURCE:
-	  case OMP_CLAUSE_DEPEND_SINK:
-	    continue;
 	  default:
 	    gcc_unreachable ();
 	  }
@@ -10860,8 +10854,8 @@ gimplify_scan_omp_clauses (tree *list_p, gimple_seq *pre_p,
 	  gimplify_omp_affinity (list_p, pre_p);
 	  remove = true;
 	  break;
-	case OMP_CLAUSE_DEPEND:
-	  if (OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SINK)
+	case OMP_CLAUSE_DOACROSS:
+	  if (OMP_CLAUSE_DOACROSS_KIND (c) == OMP_CLAUSE_DOACROSS_SINK)
 	    {
 	      tree deps = OMP_CLAUSE_DECL (c);
 	      while (deps && TREE_CODE (deps) == TREE_LIST)
@@ -10872,10 +10866,12 @@ gimplify_scan_omp_clauses (tree *list_p, gimple_seq *pre_p,
 				   pre_p, NULL, is_gimple_val, fb_rvalue);
 		  deps = TREE_CHAIN (deps);
 		}
-	      break;
 	    }
-	  else if (OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SOURCE)
-	    break;
+	  else
+	    gcc_assert (OMP_CLAUSE_DOACROSS_KIND (c)
+			== OMP_CLAUSE_DOACROSS_SOURCE);
+	  break;
+	case OMP_CLAUSE_DEPEND:
 	  if (handled_depend_iterators == -1)
 	    handled_depend_iterators = gimplify_omp_depend (list_p, pre_p);
 	  if (handled_depend_iterators)
@@ -12579,6 +12575,7 @@ gimplify_adjust_omp_clauses (gimple_seq *pre_p, gimple_seq body, tree *list_p,
 	case OMP_CLAUSE_SAFELEN:
 	case OMP_CLAUSE_SIMDLEN:
 	case OMP_CLAUSE_DEPEND:
+	case OMP_CLAUSE_DOACROSS:
 	case OMP_CLAUSE_PRIORITY:
 	case OMP_CLAUSE_GRAINSIZE:
 	case OMP_CLAUSE_NUM_TASKS:
@@ -13152,6 +13149,30 @@ localize_reductions (tree clauses, tree body)
 }
 
 
+/* Helper function of gimplify_omp_for, find OMP_ORDERED with
+   OMP_CLAUSE_DOACROSS clause inside of OMP_FOR's body.  */
+
+static tree
+find_standalone_omp_ordered (tree *tp, int *walk_subtrees, void *)
+{
+  switch (TREE_CODE (*tp))
+    {
+    case OMP_ORDERED:
+      if (omp_find_clause (OMP_ORDERED_CLAUSES (*tp), OMP_CLAUSE_DOACROSS))
+	return *tp;
+      break;
+    case OMP_SIMD:
+    case OMP_PARALLEL:
+    case OMP_TARGET:
+      *walk_subtrees = 0;
+      break;
+    default:
+      break;
+    }
+  return NULL_TREE;
+}
+
+
 /* Gimplify the gross structure of an OMP_FOR statement.  */
 
 static enum gimplify_status
@@ -13543,12 +13564,24 @@ gimplify_omp_for (tree *expr_p, gimple_seq *pre_p)
 
   tree c = omp_find_clause (OMP_FOR_CLAUSES (for_stmt), OMP_CLAUSE_ORDERED);
   bool is_doacross = false;
-  if (c && OMP_CLAUSE_ORDERED_EXPR (c))
+  if (c && walk_tree_without_duplicates (&OMP_FOR_BODY (for_stmt),
+					 find_standalone_omp_ordered, NULL))
     {
+      OMP_CLAUSE_ORDERED_DOACROSS (c) = 1;
       is_doacross = true;
-      gimplify_omp_ctxp->loop_iter_var.create (TREE_VEC_LENGTH
-						 (OMP_FOR_INIT (for_stmt))
-					       * 2);
+      int len = TREE_VEC_LENGTH (OMP_FOR_INIT (for_stmt));
+      gimplify_omp_ctxp->loop_iter_var.create (len * 2);
+      for (tree *pc = &OMP_FOR_CLAUSES (for_stmt); *pc; )
+	if (OMP_CLAUSE_CODE (*pc) == OMP_CLAUSE_LINEAR)
+	  {
+	    error_at (OMP_CLAUSE_LOCATION (*pc),
+		      "%<linear%> clause may not be specified together "
+		      "with %<ordered%> clause if stand-alone %<ordered%> "
+		      "construct is nested in it");
+	    *pc = OMP_CLAUSE_CHAIN (*pc);
+	  }
+	else
+	  pc = &OMP_CLAUSE_CHAIN (*pc);
     }
   int collapse = 1, tile = 0;
   c = omp_find_clause (OMP_FOR_CLAUSES (for_stmt), OMP_CLAUSE_COLLAPSE);
@@ -15709,21 +15742,22 @@ gimplify_omp_ordered (tree expr, gimple_seq body)
   if (gimplify_omp_ctxp)
     {
       for (c = OMP_ORDERED_CLAUSES (expr); c; c = OMP_CLAUSE_CHAIN (c))
-	if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DEPEND
-	    && gimplify_omp_ctxp->loop_iter_var.is_empty ()
-	    && (OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SINK
-		|| OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SOURCE))
+	if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DOACROSS
+	    && gimplify_omp_ctxp->loop_iter_var.is_empty ())
 	  {
 	    error_at (OMP_CLAUSE_LOCATION (c),
-		      "%<ordered%> construct with %<depend%> clause must be "
-		      "closely nested inside a loop with %<ordered%> clause "
-		      "with a parameter");
+		      "%<ordered%> construct with %qs clause must be "
+		      "closely nested inside a loop with %<ordered%> clause",
+		      OMP_CLAUSE_DOACROSS_DEPEND (c) ? "depend" : "doacross");
 	    failures++;
 	  }
-	else if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DEPEND
-		 && OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SINK)
+	else if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DOACROSS
+		 && OMP_CLAUSE_DOACROSS_KIND (c) == OMP_CLAUSE_DOACROSS_SINK)
 	  {
 	    bool fail = false;
+	    sink_c = c;
+	    if (OMP_CLAUSE_DECL (c) == NULL_TREE)
+	      continue;  /* omp_cur_iteration - 1 */
 	    for (decls = OMP_CLAUSE_DECL (c), i = 0;
 		 decls && TREE_CODE (decls) == TREE_LIST;
 		 decls = TREE_CHAIN (decls), ++i)
@@ -15746,21 +15780,24 @@ gimplify_omp_ordered (tree expr, gimple_seq body)
 	    if (!fail && i != gimplify_omp_ctxp->loop_iter_var.length () / 2)
 	      {
 		error_at (OMP_CLAUSE_LOCATION (c),
-			  "number of variables in %<depend%> clause with "
+			  "number of variables in %qs clause with "
 			  "%<sink%> modifier does not match number of "
-			  "iteration variables");
+			  "iteration variables",
+			  OMP_CLAUSE_DOACROSS_DEPEND (c)
+			  ? "depend" : "doacross");
 		failures++;
 	      }
-	    sink_c = c;
 	  }
-	else if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DEPEND
-		 && OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SOURCE)
+	else if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DOACROSS
+		 && OMP_CLAUSE_DOACROSS_KIND (c) == OMP_CLAUSE_DOACROSS_SOURCE)
 	  {
 	    if (source_c)
 	      {
 		error_at (OMP_CLAUSE_LOCATION (c),
-			  "more than one %<depend%> clause with %<source%> "
-			  "modifier on an %<ordered%> construct");
+			  "more than one %qs clause with %<source%> "
+			  "modifier on an %<ordered%> construct",
+			  OMP_CLAUSE_DOACROSS_DEPEND (source_c)
+			  ? "depend" : "doacross");
 		failures++;
 	      }
 	    else
@@ -15770,9 +15807,11 @@ gimplify_omp_ordered (tree expr, gimple_seq body)
   if (source_c && sink_c)
     {
       error_at (OMP_CLAUSE_LOCATION (source_c),
-		"%<depend%> clause with %<source%> modifier specified "
-		"together with %<depend%> clauses with %<sink%> modifier "
-		"on the same construct");
+		"%qs clause with %<source%> modifier specified "
+		"together with %qs clauses with %<sink%> modifier "
+		"on the same construct",
+		OMP_CLAUSE_DOACROSS_DEPEND (source_c) ? "depend" : "doacross",
+		OMP_CLAUSE_DOACROSS_DEPEND (sink_c) ? "depend" : "doacross");
       failures++;
     }
 
diff --git a/gcc/lto-streamer-out.cc b/gcc/lto-streamer-out.cc
index 471f35c315f..1bc3f551599 100644
--- a/gcc/lto-streamer-out.cc
+++ b/gcc/lto-streamer-out.cc
@@ -1553,6 +1553,9 @@ hash_tree (struct streamer_tree_cache_d *cache, hash_map<tree, hashval_t> *map,
 	case OMP_CLAUSE_DEPEND:
 	  val = OMP_CLAUSE_DEPEND_KIND (t);
 	  break;
+	case OMP_CLAUSE_DOACROSS:
+	  val = OMP_CLAUSE_DOACROSS_KIND (t);
+	  break;
 	case OMP_CLAUSE_MAP:
 	  val = OMP_CLAUSE_MAP_KIND (t);
 	  break;
diff --git a/gcc/omp-expand.cc b/gcc/omp-expand.cc
index 9f887c2d0e1..48a0c8b634f 100644
--- a/gcc/omp-expand.cc
+++ b/gcc/omp-expand.cc
@@ -3306,6 +3306,11 @@ expand_omp_ordered_sink (gimple_stmt_iterator *gsi, struct omp_for_data *fd,
   gimple_stmt_iterator gsi2 = *gsi;
   bool warned_step = false;
 
+  if (deps == NULL)
+    {
+      sorry_at (loc, "%<doacross(sink:omp_cur_iteration-1)%> not supported yet");
+      return;
+    }
   for (i = 0; i < fd->ordered; i++)
     {
       tree step = NULL_TREE;
@@ -3329,9 +3334,11 @@ expand_omp_ordered_sink (gimple_stmt_iterator *gsi, struct omp_for_data *fd,
 		break;
 	      forward = tree_int_cst_sgn (step) != -1;
 	    }
-	  if (forward ^ OMP_CLAUSE_DEPEND_SINK_NEGATIVE (deps))
-	    warning_at (loc, 0, "%<depend%> clause with %<sink%> modifier "
-				"waiting for lexically later iteration");
+	  if (forward ^ OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (deps))
+	    warning_at (loc, 0, "%qs clause with %<sink%> modifier "
+				"waiting for lexically later iteration",
+			OMP_CLAUSE_DOACROSS_DEPEND (c)
+			? "depend" : "doacross");
 	  break;
 	}
       deps = TREE_CHAIN (deps);
@@ -3385,13 +3392,13 @@ expand_omp_ordered_sink (gimple_stmt_iterator *gsi, struct omp_for_data *fd,
 	  tree co = fold_convert_loc (loc, itype, off);
 	  if (POINTER_TYPE_P (TREE_TYPE (fd->loops[i].v)))
 	    {
-	      if (OMP_CLAUSE_DEPEND_SINK_NEGATIVE (deps))
+	      if (OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (deps))
 		co = fold_build1_loc (loc, NEGATE_EXPR, itype, co);
 	      a = fold_build2_loc (loc, POINTER_PLUS_EXPR,
 				   TREE_TYPE (fd->loops[i].v), fd->loops[i].v,
 				   co);
 	    }
-	  else if (OMP_CLAUSE_DEPEND_SINK_NEGATIVE (deps))
+	  else if (OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (deps))
 	    a = fold_build2_loc (loc, MINUS_EXPR, TREE_TYPE (fd->loops[i].v),
 				 fd->loops[i].v, co);
 	  else
@@ -3400,13 +3407,13 @@ expand_omp_ordered_sink (gimple_stmt_iterator *gsi, struct omp_for_data *fd,
 	  if (step)
 	    {
 	      tree t1, t2;
-	      if (OMP_CLAUSE_DEPEND_SINK_NEGATIVE (deps))
+	      if (OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (deps))
 		t1 = fold_build2_loc (loc, GE_EXPR, boolean_type_node, a,
 				      fd->loops[i].n1);
 	      else
 		t1 = fold_build2_loc (loc, LT_EXPR, boolean_type_node, a,
 				      fd->loops[i].n2);
-	      if (OMP_CLAUSE_DEPEND_SINK_NEGATIVE (deps))
+	      if (OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (deps))
 		t2 = fold_build2_loc (loc, LT_EXPR, boolean_type_node, a,
 				      fd->loops[i].n2);
 	      else
@@ -3428,14 +3435,14 @@ expand_omp_ordered_sink (gimple_stmt_iterator *gsi, struct omp_for_data *fd,
 	    }
 	  else if (fd->loops[i].cond_code == LT_EXPR)
 	    {
-	      if (OMP_CLAUSE_DEPEND_SINK_NEGATIVE (deps))
+	      if (OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (deps))
 		t = fold_build2_loc (loc, GE_EXPR, boolean_type_node, a,
 				     fd->loops[i].n1);
 	      else
 		t = fold_build2_loc (loc, LT_EXPR, boolean_type_node, a,
 				     fd->loops[i].n2);
 	    }
-	  else if (OMP_CLAUSE_DEPEND_SINK_NEGATIVE (deps))
+	  else if (OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (deps))
 	    t = fold_build2_loc (loc, GT_EXPR, boolean_type_node, a,
 				 fd->loops[i].n2);
 	  else
@@ -3467,9 +3474,11 @@ expand_omp_ordered_sink (gimple_stmt_iterator *gsi, struct omp_for_data *fd,
 			       build_int_cst (itype, 0));
 	  if (integer_zerop (t) && !warned_step)
 	    {
-	      warning_at (loc, 0, "%<depend%> clause with %<sink%> modifier "
+	      warning_at (loc, 0, "%qs clause with %<sink%> modifier "
 				  "refers to iteration never in the iteration "
-				  "space");
+				  "space",
+			  OMP_CLAUSE_DOACROSS_DEPEND (c)
+			  ? "depend" : "doacross");
 	      warned_step = true;
 	    }
 	  cond = fold_build2_loc (loc, BIT_AND_EXPR, boolean_type_node,
@@ -3494,7 +3503,7 @@ expand_omp_ordered_sink (gimple_stmt_iterator *gsi, struct omp_for_data *fd,
 						s));
       else
 	off = fold_build2_loc (loc, TRUNC_DIV_EXPR, itype, off, s);
-      if (OMP_CLAUSE_DEPEND_SINK_NEGATIVE (deps))
+      if (OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (deps))
 	off = fold_build1_loc (loc, NEGATE_EXPR, itype, off);
       off = fold_convert_loc (loc, fd->iter_type, off);
       if (i <= fd->collapse - 1 && fd->collapse > 1)
@@ -3567,13 +3576,13 @@ expand_omp_ordered_source_sink (struct omp_region *region,
 	tree c;
 	for (c = gimple_omp_ordered_clauses (ord_stmt);
 	     c; c = OMP_CLAUSE_CHAIN (c))
-	  if (OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SOURCE)
+	  if (OMP_CLAUSE_DOACROSS_KIND (c) == OMP_CLAUSE_DOACROSS_SOURCE)
 	    break;
 	if (c)
 	  expand_omp_ordered_source (&gsi, fd, counts, loc);
 	for (c = gimple_omp_ordered_clauses (ord_stmt);
 	     c; c = OMP_CLAUSE_CHAIN (c))
-	  if (OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SINK)
+	  if (OMP_CLAUSE_DOACROSS_KIND (c) == OMP_CLAUSE_DOACROSS_SINK)
 	    expand_omp_ordered_sink (&gsi, fd, counts, c, loc);
 	gsi_remove (&gsi, true);
       }
@@ -10611,7 +10620,7 @@ expand_omp (struct omp_region *region)
 	    gomp_ordered *ord_stmt
 	      = as_a <gomp_ordered *> (last_stmt (region->entry));
 	    if (omp_find_clause (gimple_omp_ordered_clauses (ord_stmt),
-				 OMP_CLAUSE_DEPEND))
+				 OMP_CLAUSE_DOACROSS))
 	      {
 		/* We'll expand these when expanding corresponding
 		   worksharing region with ordered(n) clause.  */
@@ -10746,7 +10755,7 @@ build_omp_regions_1 (basic_block bb, struct omp_region *parent,
 	  else if (code == GIMPLE_OMP_ORDERED
 		   && omp_find_clause (gimple_omp_ordered_clauses
 					 (as_a <gomp_ordered *> (stmt)),
-				       OMP_CLAUSE_DEPEND))
+				       OMP_CLAUSE_DOACROSS))
 	    /* #pragma omp ordered depend is also just a stand-alone
 	       directive.  */
 	    region = NULL;
@@ -10972,7 +10981,7 @@ omp_make_gimple_edges (basic_block bb, struct omp_region **region,
       fallthru = true;
       if (omp_find_clause (gimple_omp_ordered_clauses
 			     (as_a <gomp_ordered *> (last)),
-			   OMP_CLAUSE_DEPEND))
+			   OMP_CLAUSE_DOACROSS))
 	cur_region = cur_region->outer;
       break;
 
diff --git a/gcc/omp-general.cc b/gcc/omp-general.cc
index 13d9a5e4492..aae5d105bdb 100644
--- a/gcc/omp-general.cc
+++ b/gcc/omp-general.cc
@@ -242,8 +242,13 @@ omp_extract_for_data (gomp_for *for_stmt, struct omp_for_data *fd,
 	break;
       case OMP_CLAUSE_ORDERED:
 	fd->have_ordered = true;
-	if (OMP_CLAUSE_ORDERED_EXPR (t))
-	  fd->ordered = tree_to_shwi (OMP_CLAUSE_ORDERED_EXPR (t));
+	if (OMP_CLAUSE_ORDERED_DOACROSS (t))
+	  {
+	    if (OMP_CLAUSE_ORDERED_EXPR (t))
+	      fd->ordered = tree_to_shwi (OMP_CLAUSE_ORDERED_EXPR (t));
+	    else
+	      fd->ordered = -1;
+	  }
 	break;
       case OMP_CLAUSE_SCHEDULE:
 	gcc_assert (!distribute && !taskloop);
@@ -302,6 +307,9 @@ omp_extract_for_data (gomp_for *for_stmt, struct omp_for_data *fd,
 	break;
       }
 
+  if (fd->ordered == -1)
+    fd->ordered = fd->collapse;
+
   /* For order(reproducible:concurrent) schedule ({dynamic,guided,runtime})
      we have either the option to expensively remember at runtime how we've
      distributed work from first loop and reuse that in following loops with
diff --git a/gcc/omp-low.cc b/gcc/omp-low.cc
index ea51ff9e697..ce114af7518 100644
--- a/gcc/omp-low.cc
+++ b/gcc/omp-low.cc
@@ -4115,14 +4115,13 @@ check_omp_nesting_restrictions (gimple *stmt, omp_context *ctx)
       break;
     case GIMPLE_OMP_TASK:
       for (c = gimple_omp_task_clauses (stmt); c; c = OMP_CLAUSE_CHAIN (c))
-	if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DEPEND
-	    && (OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SOURCE
-		|| OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SINK))
+	if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DOACROSS)
 	  {
-	    enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_KIND (c);
+	    enum omp_clause_doacross_kind kind = OMP_CLAUSE_DOACROSS_KIND (c);
 	    error_at (OMP_CLAUSE_LOCATION (c),
-		      "%<depend(%s)%> is only allowed in %<omp ordered%>",
-		      kind == OMP_CLAUSE_DEPEND_SOURCE ? "source" : "sink");
+		      "%<%s(%s)%> is only allowed in %<omp ordered%>",
+		      OMP_CLAUSE_DOACROSS_DEPEND (c) ? "depend" : "doacross",
+		      kind == OMP_CLAUSE_DOACROSS_SOURCE ? "source" : "sink");
 	    return false;
 	  }
       break;
@@ -4130,43 +4129,30 @@ check_omp_nesting_restrictions (gimple *stmt, omp_context *ctx)
       for (c = gimple_omp_ordered_clauses (as_a <gomp_ordered *> (stmt));
 	   c; c = OMP_CLAUSE_CHAIN (c))
 	{
-	  if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_DEPEND)
+	  if (OMP_CLAUSE_CODE (c) != OMP_CLAUSE_DOACROSS)
 	    {
-	      gcc_assert (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_THREADS
-			  || OMP_CLAUSE_CODE (c) == OMP_CLAUSE_SIMD);
-	      continue;
-	    }
-	  enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_KIND (c);
-	  if (kind == OMP_CLAUSE_DEPEND_SOURCE
-	      || kind == OMP_CLAUSE_DEPEND_SINK)
-	    {
-	      tree oclause;
-	      /* Look for containing ordered(N) loop.  */
-	      if (ctx == NULL
-		  || gimple_code (ctx->stmt) != GIMPLE_OMP_FOR
-		  || (oclause
-			= omp_find_clause (gimple_omp_for_clauses (ctx->stmt),
-					   OMP_CLAUSE_ORDERED)) == NULL_TREE)
+	      if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DEPEND)
 		{
 		  error_at (OMP_CLAUSE_LOCATION (c),
-			    "%<ordered%> construct with %<depend%> clause "
-			    "must be closely nested inside an %<ordered%> "
-			    "loop");
-		  return false;
-		}
-	      else if (OMP_CLAUSE_ORDERED_EXPR (oclause) == NULL_TREE)
-		{
-		  error_at (OMP_CLAUSE_LOCATION (c),
-			    "%<ordered%> construct with %<depend%> clause "
-			    "must be closely nested inside a loop with "
-			    "%<ordered%> clause with a parameter");
+			    "invalid depend kind in omp %<ordered%> %<depend%>");
 		  return false;
 		}
+	      gcc_assert (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_THREADS
+			  || OMP_CLAUSE_CODE (c) == OMP_CLAUSE_SIMD);
+	      continue;
 	    }
-	  else
+
+	  tree oclause;
+	  /* Look for containing ordered(N) loop.  */
+	  if (ctx == NULL
+	      || gimple_code (ctx->stmt) != GIMPLE_OMP_FOR
+	      || (oclause
+		  = omp_find_clause (gimple_omp_for_clauses (ctx->stmt),
+				     OMP_CLAUSE_ORDERED)) == NULL_TREE)
 	    {
 	      error_at (OMP_CLAUSE_LOCATION (c),
-			"invalid depend kind in omp %<ordered%> %<depend%>");
+			"%<ordered%> construct with %<depend%> clause "
+			"must be closely nested inside an %<ordered%> loop");
 	      return false;
 	    }
 	}
@@ -4211,14 +4197,37 @@ check_omp_nesting_restrictions (gimple *stmt, omp_context *ctx)
 			  "a loop region with an %<ordered%> clause");
 		return false;
 	      }
-	    if (OMP_CLAUSE_ORDERED_EXPR (o) != NULL_TREE
-		&& omp_find_clause (c, OMP_CLAUSE_DEPEND) == NULL_TREE)
+	    if (omp_find_clause (c, OMP_CLAUSE_DOACROSS) == NULL_TREE)
 	      {
-		error_at (gimple_location (stmt),
-			  "%<ordered%> region without %<depend%> clause may "
-			  "not be closely nested inside a loop region with "
-			  "an %<ordered%> clause with a parameter");
-		return false;
+		if (OMP_CLAUSE_ORDERED_DOACROSS (o))
+		  {
+		    error_at (gimple_location (stmt),
+			      "%<ordered%> construct without %<doacross%> or "
+			      "%<depend%> clauses must not have the same "
+			      "binding region as %<ordered%> construct with "
+			      "those clauses");
+		    return false;
+		  }
+		else if (OMP_CLAUSE_ORDERED_EXPR (o))
+		  {
+		    tree co
+		      = omp_find_clause (gimple_omp_for_clauses (ctx->stmt),
+					 OMP_CLAUSE_COLLAPSE);
+		    HOST_WIDE_INT
+		      o_n = tree_to_shwi (OMP_CLAUSE_ORDERED_EXPR (o));
+		    HOST_WIDE_INT c_n = 1;
+		    if (co)
+		      c_n = tree_to_shwi (OMP_CLAUSE_COLLAPSE_EXPR (co));
+		    if (o_n != c_n)
+		      {
+			error_at (gimple_location (stmt),
+				  "%<ordered%> construct without %<doacross%> "
+				  "or %<depend%> clauses binds to loop where "
+				  "%<collapse%> argument %wd is different from "
+				  "%<ordered%> argument %wd", c_n, o_n);
+			return false;
+		      }
+		  }
 	      }
 	    return true;
 	  case GIMPLE_OMP_TARGET:
@@ -4272,14 +4281,12 @@ check_omp_nesting_restrictions (gimple *stmt, omp_context *ctx)
       break;
     case GIMPLE_OMP_TARGET:
       for (c = gimple_omp_target_clauses (stmt); c; c = OMP_CLAUSE_CHAIN (c))
-	if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DEPEND
-	    && (OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SOURCE
-		|| OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SINK))
+	if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DOACROSS)
 	  {
-	    enum omp_clause_depend_kind kind = OMP_CLAUSE_DEPEND_KIND (c);
+	    enum omp_clause_doacross_kind kind = OMP_CLAUSE_DOACROSS_KIND (c);
 	    error_at (OMP_CLAUSE_LOCATION (c),
 		      "%<depend(%s)%> is only allowed in %<omp ordered%>",
-		      kind == OMP_CLAUSE_DEPEND_SOURCE ? "source" : "sink");
+		      kind == OMP_CLAUSE_DOACROSS_SOURCE ? "source" : "sink");
 	    return false;
 	  }
       if (is_gimple_omp_offloaded (stmt)
@@ -10438,8 +10445,8 @@ lower_omp_ordered_clauses (gimple_stmt_iterator *gsi_p, gomp_ordered *ord_stmt,
 
   tree *list_p = gimple_omp_ordered_clauses_ptr (ord_stmt);
   tree c = gimple_omp_ordered_clauses (ord_stmt);
-  if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DEPEND
-      && OMP_CLAUSE_DEPEND_KIND (c) == OMP_CLAUSE_DEPEND_SINK)
+  if (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DOACROSS
+      && OMP_CLAUSE_DOACROSS_KIND (c) == OMP_CLAUSE_DOACROSS_SINK)
     {
       /* Merge depend clauses from multiple adjacent
 	 #pragma omp ordered depend(sink:...) constructs
@@ -10461,8 +10468,8 @@ lower_omp_ordered_clauses (gimple_stmt_iterator *gsi_p, gomp_ordered *ord_stmt,
 	  gomp_ordered *ord_stmt2 = as_a <gomp_ordered *> (stmt);
 	  c = gimple_omp_ordered_clauses (ord_stmt2);
 	  if (c == NULL_TREE
-	      || OMP_CLAUSE_CODE (c) != OMP_CLAUSE_DEPEND
-	      || OMP_CLAUSE_DEPEND_KIND (c) != OMP_CLAUSE_DEPEND_SINK)
+	      || OMP_CLAUSE_CODE (c) != OMP_CLAUSE_DOACROSS
+	      || OMP_CLAUSE_DOACROSS_KIND (c) != OMP_CLAUSE_DOACROSS_SINK)
 	    break;
 	  while (*list_p)
 	    list_p = &OMP_CLAUSE_CHAIN (*list_p);
@@ -10529,8 +10536,8 @@ lower_omp_ordered_clauses (gimple_stmt_iterator *gsi_p, gomp_ordered *ord_stmt,
     {
       bool remove = false;
 
-      gcc_assert (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DEPEND);
-      if (OMP_CLAUSE_DEPEND_KIND (c) != OMP_CLAUSE_DEPEND_SINK)
+      gcc_assert (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_DOACROSS);
+      if (OMP_CLAUSE_DOACROSS_KIND (c) != OMP_CLAUSE_DOACROSS_SINK)
 	goto next_ordered_clause;
 
       tree vec;
@@ -10681,7 +10688,7 @@ lower_omp_ordered (gimple_stmt_iterator *gsi_p, omp_context *ctx)
 				  OMP_CLAUSE_THREADS);
 
   if (omp_find_clause (gimple_omp_ordered_clauses (ord_stmt),
-		       OMP_CLAUSE_DEPEND))
+		       OMP_CLAUSE_DOACROSS))
     {
       /* FIXME: This is needs to be moved to the expansion to verify various
 	 conditions only testable on cfg with dominators computed, and also
@@ -13149,9 +13156,6 @@ lower_depend_clauses (tree *pclauses, gimple_seq *iseq, gimple_seq *oseq)
 	case OMP_CLAUSE_DEPEND_INOUTSET:
 	  cnt[4]++;
 	  break;
-	case OMP_CLAUSE_DEPEND_SOURCE:
-	case OMP_CLAUSE_DEPEND_SINK:
-	  /* FALLTHRU */
 	default:
 	  gcc_unreachable ();
 	}
diff --git a/gcc/testsuite/ChangeLog.omp b/gcc/testsuite/ChangeLog.omp
index ab273766e31..9daad25790f 100644
--- a/gcc/testsuite/ChangeLog.omp
+++ b/gcc/testsuite/ChangeLog.omp
@@ -1,3 +1,16 @@
+2022-09-05  Tobias Burnus  <tobias@codesourcery.com>
+
+	Backport from mainline:
+	2022-09-03  Jakub Jelinek  <jakub@redhat.com>
+
+	* c-c++-common/gomp/doacross-2.c: Adjust expected diagnostics.
+	* c-c++-common/gomp/doacross-5.c: New test.
+	* c-c++-common/gomp/doacross-6.c: New test.
+	* c-c++-common/gomp/nesting-2.c: Adjust expected diagnostics.
+	* c-c++-common/gomp/ordered-3.c: Likewise.
+	* c-c++-common/gomp/sink-3.c: Likewise.
+	* gfortran.dg/gomp/nesting-2.f90: Likewise.
+
 2022-09-01  Andrew Stubbs  <ams@codesourcery.com>
 
 	* gcc.dg/vect/vect-simd-clone-1.c: Add dg-warning.
diff --git a/gcc/testsuite/c-c++-common/gomp/doacross-2.c b/gcc/testsuite/c-c++-common/gomp/doacross-2.c
index cc454879553..44c5c212c89 100644
--- a/gcc/testsuite/c-c++-common/gomp/doacross-2.c
+++ b/gcc/testsuite/c-c++-common/gomp/doacross-2.c
@@ -7,13 +7,13 @@ foo (void)
   #pragma omp for ordered(1)
   for (i = 0; i < 64; i++)
     {
-      #pragma omp ordered			/* { dg-error "'ordered' region without 'depend' clause may not be closely nested inside a loop region with an 'ordered' clause with a parameter" } */
+      #pragma omp ordered
       ;
     }
   #pragma omp for ordered(1)
   for (i = 0; i < 64; i++)
     {
-      #pragma omp ordered threads		/* { dg-error "'ordered' region without 'depend' clause may not be closely nested inside a loop region with an 'ordered' clause with a parameter" } */
+      #pragma omp ordered threads
       ;
     }
 }
@@ -25,14 +25,20 @@ bar (void)
   #pragma omp for ordered
   for (i = 0; i < 64; i++)
     {
-      #pragma omp ordered depend(source)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause with a parameter" } */
-      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause with a parameter" } */
+      #pragma omp ordered depend(source)
+      #pragma omp ordered depend(sink: i - 1)
+    }
+  #pragma omp for ordered
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered doacross(source:)
+      #pragma omp ordered doacross(sink: i - 1)
     }
   #pragma omp for
   for (i = 0; i < 64; i++)
     {
-      #pragma omp ordered depend(source)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause with a parameter" } */
-      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause with a parameter" } */
+      #pragma omp ordered depend(source)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause" } */
+      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause" } */
     }
   #pragma omp for
   for (i = 0; i < 64; i++)
diff --git a/gcc/testsuite/c-c++-common/gomp/doacross-5.c b/gcc/testsuite/c-c++-common/gomp/doacross-5.c
new file mode 100644
index 00000000000..9dd6dbf4ebc
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/gomp/doacross-5.c
@@ -0,0 +1,94 @@
+void
+foo (int n)
+{
+  int i;
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(source:)
+      #pragma omp ordered doacross(sink: i - 2)
+    }
+}
+
+void
+bar (int n)
+{
+  int i, j;
+  #pragma omp for collapse(2) ordered(2)
+  for (i = 0; i < 8; i += n)
+    for (j = 0; j < 8; j += n)
+      {
+	#pragma omp ordered doacross(source:omp_cur_iteration)
+	#pragma omp ordered doacross(sink: i - 2, j + 2)
+      }
+}
+
+void
+baz (void)
+{
+  int i, j;
+  #pragma omp for ordered(1)
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered			/* { dg-error "'ordered' construct without 'doacross' or 'depend' clauses must not have the same binding region as 'ordered' construct with those clauses" } */
+      ;
+      #pragma omp ordered doacross(source:)
+      #pragma omp ordered doacross(sink: i - 1)
+    }
+  #pragma omp for ordered
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered doacross(source: omp_cur_iteration )
+      #pragma omp ordered doacross(sink: i - 1)
+      #pragma omp ordered threads		/* { dg-error "'ordered' construct without 'doacross' or 'depend' clauses must not have the same binding region as 'ordered' construct with those clauses" } */
+      ;
+    }
+  #pragma omp for ordered(2)
+  for (i = 0; i < 8; i++)
+    for (j = 0; j < 8; j++)
+      {
+	#pragma omp ordered			/* { dg-error "'ordered' construct without 'doacross' or 'depend' clauses binds to loop where 'collapse' argument 1 is different from 'ordered' argument 2" } */
+	;
+      }
+  #pragma omp for ordered(2) collapse(1)
+  for (i = 0; i < 8; i++)
+    for (j = 0; j < 8; j++)
+      {
+	#pragma omp ordered threads		/* { dg-error "'ordered' construct without 'doacross' or 'depend' clauses binds to loop where 'collapse' argument 1 is different from 'ordered' argument 2" } */
+	;
+      }
+}
+
+void
+qux (void)
+{
+  int i, j = 0;
+  #pragma omp for ordered linear(j)
+  for (i = 0; i < 64; i++)
+    {
+      ++j;
+      #pragma omp ordered
+      ;
+    }
+  #pragma omp for ordered linear(j)		/* { dg-error "'linear' clause may not be specified together with 'ordered' clause if stand-alone 'ordered' construct is nested in it" } */
+  for (i = 0; i < 64; i++)
+    {
+      ++j;
+      #pragma omp ordered doacross(source:)
+      #pragma omp ordered doacross(sink:i-1)
+    }
+  #pragma omp for ordered(1) linear(j)
+  for (i = 0; i < 64; i++)
+    {
+      ++j;
+      #pragma omp ordered
+      ;
+    }
+  #pragma omp for ordered(1) linear(j)		/* { dg-error "'linear' clause may not be specified together with 'ordered' clause if stand-alone 'ordered' construct is nested in it" } */
+  for (i = 0; i < 64; i++)
+    {
+      ++j;
+      #pragma omp ordered doacross(source:)
+      #pragma omp ordered doacross(sink:i-1)
+    }
+}
diff --git a/gcc/testsuite/c-c++-common/gomp/doacross-6.c b/gcc/testsuite/c-c++-common/gomp/doacross-6.c
new file mode 100644
index 00000000000..d126ad1bb2d
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/gomp/doacross-6.c
@@ -0,0 +1,74 @@
+void
+foo (int n)
+{
+  int i;
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(source)		/* { dg-error "expected ':' before '\\\)' token" } */
+    }
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(source:omp_current_iteration)	/* { dg-error "expected '\\\)' before 'omp_current_iteration'" } */
+    }
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(source:i - 2)	/* { dg-error "expected '\\\)' before 'i'" } */
+    }
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(sink)		/* { dg-error "expected ':' before '\\\)' token" } */
+    }
+}
+
+void
+bar (int n)
+{
+  int i;
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(sink:omp_current_iteration - 1)	/* { dg-error "'omp_current_iteration' undeclared \\\(first use in this function\\\)" "" { target c } } */
+    }									/* { dg-error "'omp_current_iteration' has not been declared" "" { target c++ } .-1 } */
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(sink:omp_cur_iteration)	/* { dg-error "'omp_cur_iteration' undeclared \\\(first use in this function\\\)" "" { target c } } */
+    }								/* { dg-error "'omp_cur_iteration' has not been declared" "" { target c++ } .-1 } */
+}
+
+void
+baz (int n)
+{
+  int i;
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(sink:omp_cur_iteration + 1)	/* { dg-error "'omp_cur_iteration' undeclared \\\(first use in this function\\\)" "" { target c } } */
+    }								/* { dg-error "'omp_cur_iteration' has not been declared" "" { target c++ } .-1 } */
+}
+
+void
+qux (int n)
+{
+  int i;
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(sink:omp_cur_iteration - (2 - 1))	/* { dg-error "'omp_cur_iteration' undeclared \\\(first use in this function\\\)" "" { target c } } */
+    }								/* { dg-error "expected integer before '\\\(' token" "" { target *-*-* } .-1 } */
+}								/* { dg-error "'omp_cur_iteration' has not been declared" "" { target c++ } .-2 } */
+								/* { dg-error "expected '\\\)' before '\\\(' token" "" { target c++ } .-3 } */
+void
+corge (int n)
+{
+  int i;
+  #pragma omp for ordered
+  for (i = 0; i < 8; i += n)
+    {
+      #pragma omp ordered doacross(sink:omp_cur_iteration - 1LL)	/* { dg-error "'omp_cur_iteration' undeclared \\\(first use in this function\\\)" "" { target c } } */
+    }									/* { dg-error "'omp_cur_iteration' has not been declared" "" { target c++ } .-1 } */
+}
diff --git a/gcc/testsuite/c-c++-common/gomp/nesting-2.c b/gcc/testsuite/c-c++-common/gomp/nesting-2.c
index 420cfd3cfa6..6ce560de7f5 100644
--- a/gcc/testsuite/c-c++-common/gomp/nesting-2.c
+++ b/gcc/testsuite/c-c++-common/gomp/nesting-2.c
@@ -160,7 +160,14 @@ foo (void)
   for (i = 0; i < 64; i++)
     #pragma omp parallel
     {
-      #pragma omp ordered depend(source)	/* { dg-error ".ordered. construct with .depend. clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
-      #pragma omp ordered depend(sink: i - 1)	/* { dg-error ".ordered. construct with .depend. clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
+      #pragma omp ordered depend(source)	/* { dg-error ".ordered. construct with .depend. clause must be closely nested inside a loop with .ordered. clause" } */
+      #pragma omp ordered depend(sink: i - 1)	/* { dg-error ".ordered. construct with .depend. clause must be closely nested inside a loop with .ordered. clause" } */
+    }
+  #pragma omp for ordered(1)
+  for (i = 0; i < 64; i++)
+    #pragma omp parallel
+    {
+      #pragma omp ordered doacross(source:)	/* { dg-error ".ordered. construct with .doacross. clause must be closely nested inside a loop with .ordered. clause" } */
+      #pragma omp ordered doacross(sink: i - 1)	/* { dg-error ".ordered. construct with .doacross. clause must be closely nested inside a loop with .ordered. clause" } */
     }
 }
diff --git a/gcc/testsuite/c-c++-common/gomp/ordered-3.c b/gcc/testsuite/c-c++-common/gomp/ordered-3.c
index e7fd738f669..b007ca7982a 100644
--- a/gcc/testsuite/c-c++-common/gomp/ordered-3.c
+++ b/gcc/testsuite/c-c++-common/gomp/ordered-3.c
@@ -47,29 +47,53 @@ foo (void)
       #pragma omp ordered threads, simd, threads, simd	/* { dg-error "too many .threads. clauses" } */
       ;	/* { dg-error "too many .simd. clauses" "" { target *-*-* } .-1 } */
     }
-  #pragma omp for simd ordered(1)	/* { dg-error ".ordered. clause with parameter may not be specified on .#pragma omp for simd. construct" } */
+  #pragma omp for simd ordered(1)
   for (i = 0; i < 64; i++)
     {
-      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
-      #pragma omp ordered depend(source)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
+      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
+      #pragma omp ordered depend(source)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
     }
-  #pragma omp parallel for simd ordered(1)	/* { dg-error ".ordered. clause with parameter may not be specified on .#pragma omp parallel for simd. construct" } */
+  #pragma omp for simd ordered(1)
   for (i = 0; i < 64; i++)
     {
-      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
-      #pragma omp ordered depend(source)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
+      #pragma omp ordered doacross(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
+      #pragma omp ordered doacross(source:omp_cur_iteration)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
+    }
+  #pragma omp parallel for simd ordered(1)
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
+      #pragma omp ordered depend(source)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
+    }
+  #pragma omp parallel for simd ordered(1)
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered doacross(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
+      #pragma omp ordered doacross(source:)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
+    }
+  #pragma omp parallel for ordered
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered depend(sink: i - 1)
+      #pragma omp ordered depend(source)
     }
   #pragma omp parallel for ordered
   for (i = 0; i < 64; i++)
     {
-      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
-      #pragma omp ordered depend(source)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
+      #pragma omp ordered doacross(sink: i - 1)
+      #pragma omp ordered doacross(source:)
+    }
+  #pragma omp parallel for
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
+      #pragma omp ordered depend(source)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
     }
   #pragma omp parallel for
   for (i = 0; i < 64; i++)
     {
-      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
-      #pragma omp ordered depend(source)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause with a parameter" } */
+      #pragma omp ordered doacross(sink: i - 1)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
+      #pragma omp ordered doacross(source:)	/* { dg-error "clause must be closely nested inside a loop with .ordered. clause" } */
     }
 }
 
diff --git a/gcc/testsuite/c-c++-common/gomp/sink-3.c b/gcc/testsuite/c-c++-common/gomp/sink-3.c
index 588aea215c9..3f7ba5e307d 100644
--- a/gcc/testsuite/c-c++-common/gomp/sink-3.c
+++ b/gcc/testsuite/c-c++-common/gomp/sink-3.c
@@ -14,7 +14,7 @@ foo ()
   for (i=0; i < 100; ++i)
     {
 #pragma omp ordered depend(sink:poo-1,paa+1) /* { dg-error "poo.*declared.*paa.*declared" } */
-    bar(&i);				     /* { dg-error "may not be closely nested" "" { target *-*-* } .-1 } */
+    bar(&i);				     /* { dg-error "must not have the same binding region" "" { target *-*-* } .-1 } */
 #pragma omp ordered depend(source)
     }
 }
diff --git a/gcc/testsuite/gfortran.dg/gomp/nesting-2.f90 b/gcc/testsuite/gfortran.dg/gomp/nesting-2.f90
index 2eccdf9b034..d8014d6f151 100644
--- a/gcc/testsuite/gfortran.dg/gomp/nesting-2.f90
+++ b/gcc/testsuite/gfortran.dg/gomp/nesting-2.f90
@@ -158,8 +158,8 @@ subroutine foo
   !$omp do ordered(1)
   do i = 0, 63
     !$omp parallel
-      !$omp ordered depend(source)	! { dg-error ".ordered. construct with .depend. clause must be closely nested inside a loop with .ordered. clause with a parameter" }
-      !$omp ordered depend(sink: i - 1)	! { dg-error ".ordered. construct with .depend. clause must be closely nested inside a loop with .ordered. clause with a parameter" }
+      !$omp ordered depend(source)	! { dg-error ".ordered. construct with .depend. clause must be closely nested inside a loop with .ordered. clause" }
+      !$omp ordered depend(sink: i - 1)	! { dg-error ".ordered. construct with .depend. clause must be closely nested inside a loop with .ordered. clause" }
     !$omp end parallel
   end do
 end
diff --git a/gcc/tree-core.h b/gcc/tree-core.h
index d65e474f1b3..030007ba77b 100644
--- a/gcc/tree-core.h
+++ b/gcc/tree-core.h
@@ -347,6 +347,9 @@ enum omp_clause_code {
   /* OpenMP clause: has_device_addr (variable-list).  */
   OMP_CLAUSE_HAS_DEVICE_ADDR,
 
+  /* OpenMP clause: doacross ({source,sink}:vec).  */
+  OMP_CLAUSE_DOACROSS,
+
   /* Internal structure to hold OpenACC cache directive's variable-list.
      #pragma acc cache (variable-list).  */
   OMP_CLAUSE__CACHE_,
@@ -1542,12 +1545,18 @@ enum omp_clause_depend_kind
   OMP_CLAUSE_DEPEND_INOUT,
   OMP_CLAUSE_DEPEND_MUTEXINOUTSET,
   OMP_CLAUSE_DEPEND_INOUTSET,
-  OMP_CLAUSE_DEPEND_SOURCE,
-  OMP_CLAUSE_DEPEND_SINK,
   OMP_CLAUSE_DEPEND_DEPOBJ,
+  OMP_CLAUSE_DEPEND_INVALID,
   OMP_CLAUSE_DEPEND_LAST
 };
 
+enum omp_clause_doacross_kind
+{
+  OMP_CLAUSE_DOACROSS_SOURCE,
+  OMP_CLAUSE_DOACROSS_SINK,
+  OMP_CLAUSE_DOACROSS_LAST
+};
+
 enum omp_clause_proc_bind_kind
 {
   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
@@ -1635,6 +1644,7 @@ struct GTY(()) tree_omp_clause {
     enum omp_clause_default_kind   default_kind;
     enum omp_clause_schedule_kind  schedule_kind;
     enum omp_clause_depend_kind    depend_kind;
+    enum omp_clause_doacross_kind  doacross_kind;
     /* See include/gomp-constants.h for enum gomp_map_kind's values.  */
     unsigned int		   map_kind;
     enum omp_clause_proc_bind_kind proc_bind_kind;
diff --git a/gcc/tree-nested.cc b/gcc/tree-nested.cc
index 995280904b0..ea7d57a0591 100644
--- a/gcc/tree-nested.cc
+++ b/gcc/tree-nested.cc
@@ -1368,6 +1368,7 @@ convert_nonlocal_omp_clauses (tree *pclauses, struct walk_stmt_info *wi)
 	case OMP_CLAUSE_IF:
 	case OMP_CLAUSE_NUM_THREADS:
 	case OMP_CLAUSE_DEPEND:
+	case OMP_CLAUSE_DOACROSS:
 	case OMP_CLAUSE_DEVICE:
 	case OMP_CLAUSE_NUM_TEAMS:
 	case OMP_CLAUSE_THREAD_LIMIT:
@@ -2157,6 +2158,7 @@ convert_local_omp_clauses (tree *pclauses, struct walk_stmt_info *wi)
 	case OMP_CLAUSE_IF:
 	case OMP_CLAUSE_NUM_THREADS:
 	case OMP_CLAUSE_DEPEND:
+	case OMP_CLAUSE_DOACROSS:
 	case OMP_CLAUSE_DEVICE:
 	case OMP_CLAUSE_NUM_TEAMS:
 	case OMP_CLAUSE_THREAD_LIMIT:
diff --git a/gcc/tree-pretty-print.cc b/gcc/tree-pretty-print.cc
index 8950ea88492..3ef98f05098 100644
--- a/gcc/tree-pretty-print.cc
+++ b/gcc/tree-pretty-print.cc
@@ -859,34 +859,9 @@ dump_omp_clause (pretty_printer *pp, tree clause, int spc, dump_flags_t flags)
 	case OMP_CLAUSE_DEPEND_INOUTSET:
 	  name = "inoutset";
 	  break;
-	case OMP_CLAUSE_DEPEND_SOURCE:
-	  pp_string (pp, "source)");
-	  return;
 	case OMP_CLAUSE_DEPEND_LAST:
 	  name = "__internal__";
 	  break;
-	case OMP_CLAUSE_DEPEND_SINK:
-	  pp_string (pp, "sink:");
-	  for (tree t = OMP_CLAUSE_DECL (clause); t; t = TREE_CHAIN (t))
-	    if (TREE_CODE (t) == TREE_LIST)
-	      {
-		dump_generic_node (pp, TREE_VALUE (t), spc, flags, false);
-		if (TREE_PURPOSE (t) != integer_zero_node)
-		  {
-		    if (OMP_CLAUSE_DEPEND_SINK_NEGATIVE (t))
-		      pp_minus (pp);
-		    else
-		      pp_plus (pp);
-		    dump_generic_node (pp, TREE_PURPOSE (t), spc, flags,
-				       false);
-		  }
-		if (TREE_CHAIN (t))
-		  pp_comma (pp);
-	      }
-	    else
-	      gcc_unreachable ();
-	  pp_right_paren (pp);
-	  return;
 	default:
 	  gcc_unreachable ();
 	}
@@ -913,6 +888,49 @@ dump_omp_clause (pretty_printer *pp, tree clause, int spc, dump_flags_t flags)
       }
       break;
 
+    case OMP_CLAUSE_DOACROSS:
+      pp_string (pp, OMP_CLAUSE_DOACROSS_DEPEND (clause)
+		     ? "depend(" : "doacross(");
+      switch (OMP_CLAUSE_DOACROSS_KIND (clause))
+	{
+	case OMP_CLAUSE_DOACROSS_SOURCE:
+	  if (OMP_CLAUSE_DOACROSS_DEPEND (clause))
+	    pp_string (pp, "source)");
+	  else
+	    pp_string (pp, "source:)");
+	  break;
+	case OMP_CLAUSE_DOACROSS_SINK:
+	  pp_string (pp, "sink:");
+	  if (OMP_CLAUSE_DECL (clause) == NULL_TREE)
+	    {
+	      pp_string (pp, "omp_cur_iteration-1)");
+	      break;
+	    }
+	  for (tree t = OMP_CLAUSE_DECL (clause); t; t = TREE_CHAIN (t))
+	    if (TREE_CODE (t) == TREE_LIST)
+	      {
+		dump_generic_node (pp, TREE_VALUE (t), spc, flags, false);
+		if (TREE_PURPOSE (t) != integer_zero_node)
+		  {
+		    if (OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (t))
+		      pp_minus (pp);
+		    else
+		      pp_plus (pp);
+		    dump_generic_node (pp, TREE_PURPOSE (t), spc, flags,
+				       false);
+		  }
+		if (TREE_CHAIN (t))
+		  pp_comma (pp);
+	      }
+	    else
+	      gcc_unreachable ();
+	  pp_right_paren (pp);
+	  break;
+	default:
+	  gcc_unreachable ();
+	}
+      break;
+
     case OMP_CLAUSE_MAP:
       pp_string (pp, "map(");
       switch (OMP_CLAUSE_MAP_KIND (clause))
diff --git a/gcc/tree-streamer-in.cc b/gcc/tree-streamer-in.cc
index a35a810f4d1..0c55dea9b91 100644
--- a/gcc/tree-streamer-in.cc
+++ b/gcc/tree-streamer-in.cc
@@ -456,6 +456,11 @@ unpack_ts_omp_clause_value_fields (class data_in *data_in,
       OMP_CLAUSE_DEPEND_KIND (expr)
 	= bp_unpack_enum (bp, omp_clause_depend_kind, OMP_CLAUSE_DEPEND_LAST);
       break;
+    case OMP_CLAUSE_DOACROSS:
+      OMP_CLAUSE_DOACROSS_KIND (expr)
+	= bp_unpack_enum (bp, omp_clause_doacross_kind,
+			  OMP_CLAUSE_DOACROSS_LAST);
+      break;
     case OMP_CLAUSE_MAP:
       OMP_CLAUSE_SET_MAP_KIND (expr, bp_unpack_enum (bp, gomp_map_kind,
 						     GOMP_MAP_LAST));
diff --git a/gcc/tree-streamer-out.cc b/gcc/tree-streamer-out.cc
index d39dc158a46..9b114dc05bb 100644
--- a/gcc/tree-streamer-out.cc
+++ b/gcc/tree-streamer-out.cc
@@ -419,6 +419,10 @@ pack_ts_omp_clause_value_fields (struct output_block *ob,
       bp_pack_enum (bp, omp_clause_depend_kind, OMP_CLAUSE_DEPEND_LAST,
 		    OMP_CLAUSE_DEPEND_KIND (expr));
       break;
+    case OMP_CLAUSE_DOACROSS:
+      bp_pack_enum (bp, omp_clause_doacross_kind, OMP_CLAUSE_DOACROSS_LAST,
+		    OMP_CLAUSE_DOACROSS_KIND (expr));
+      break;
     case OMP_CLAUSE_MAP:
       bp_pack_enum (bp, gomp_map_kind, GOMP_MAP_LAST,
 		    OMP_CLAUSE_MAP_KIND (expr));
diff --git a/gcc/tree.cc b/gcc/tree.cc
index b28b86ba225..46517ee8913 100644
--- a/gcc/tree.cc
+++ b/gcc/tree.cc
@@ -292,6 +292,7 @@ unsigned const char omp_clause_num_ops[] =
   2, /* OMP_CLAUSE_TO  */
   2, /* OMP_CLAUSE_MAP  */
   1, /* OMP_CLAUSE_HAS_DEVICE_ADDR  */
+  1, /* OMP_CLAUSE_DOACROSS  */
   2, /* OMP_CLAUSE__CACHE_  */
   2, /* OMP_CLAUSE_GANG  */
   1, /* OMP_CLAUSE_ASYNC  */
@@ -384,6 +385,7 @@ const char * const omp_clause_code_name[] =
   "to",
   "map",
   "has_device_addr",
+  "doacross",
   "_cache_",
   "gang",
   "async",
diff --git a/gcc/tree.h b/gcc/tree.h
index 8d855b3b474..4b1df4665d7 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -1686,9 +1686,16 @@ class auto_suppress_location_wrappers
 #define OMP_CLAUSE_DEPEND_KIND(NODE) \
   (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_DEPEND)->omp_clause.subcode.depend_kind)
 
-#define OMP_CLAUSE_DEPEND_SINK_NEGATIVE(NODE) \
+#define OMP_CLAUSE_DOACROSS_KIND(NODE) \
+  (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_DOACROSS)->omp_clause.subcode.doacross_kind)
+
+#define OMP_CLAUSE_DOACROSS_SINK_NEGATIVE(NODE) \
   TREE_PUBLIC (TREE_LIST_CHECK (NODE))
 
+/* True if DOACROSS clause is spelled as DEPEND.  */
+#define OMP_CLAUSE_DOACROSS_DEPEND(NODE) \
+  TREE_PROTECTED (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_DOACROSS))
+
 #define OMP_CLAUSE_MAP_KIND(NODE) \
   ((enum gomp_map_kind) OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_MAP)->omp_clause.subcode.map_kind)
 #define OMP_CLAUSE_SET_MAP_KIND(NODE, MAP_KIND) \
@@ -1750,6 +1757,11 @@ class auto_suppress_location_wrappers
 #define OMP_CLAUSE_ORDERED_EXPR(NODE) \
   OMP_CLAUSE_OPERAND (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_ORDERED), 0)
 
+/* True on an OMP_CLAUSE_ORDERED if stand-alone ordered construct is nested
+   inside of work-sharing loop the clause is on.  */
+#define OMP_CLAUSE_ORDERED_DOACROSS(NODE) \
+  (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_ORDERED)->base.public_flag)
+
 /* True for unconstrained modifier on order(concurrent) clause.  */
 #define OMP_CLAUSE_ORDER_UNCONSTRAINED(NODE) \
   (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_ORDER)->base.public_flag)

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