openmp: Add support for OpenMP 5.1 masked construct

This construct has been introduced as a replacement for master
construct, but unlike that construct is slightly more general,
has an optional clause which allows to choose which thread
will be the one running the region, it can be some other thread
than the master (primary) thread with number 0, or it could be no
threads or multiple threads (then of course one needs to be careful
about data races).

It is way too early to deprecate the master construct though, we don't
even have OpenMP 5.0 fully implemented, it has been deprecated in 5.1,
will be also in 5.2 and removed in 6.0.  But even then it will likely
be a good idea to just -Wdeprecated warn about it and still accept it.

The patch also contains something I should have done much earlier,
for clauses that accept some integral expression where we only care
about the value, forces during gimplification that value into
either a min invariant (as before), SSA_NAME or a fresh temporary,
but never e.g. a user VAR_DECL, so that for those clauses we don't
need to worry about adjusting it.

2021-08-12  Jakub Jelinek  <jakub@redhat.com>

gcc/
	* tree.def (OMP_MASKED): New tree code.
	* tree-core.h (enum omp_clause_code): Add OMP_CLAUSE_FILTER.
	* tree.h (OMP_MASKED_BODY, OMP_MASKED_CLAUSES, OMP_MASKED_COMBINED,
	OMP_CLAUSE_FILTER_EXPR): Define.
	* tree.c (omp_clause_num_ops): Add OMP_CLAUSE_FILTER entry.
	(omp_clause_code_name): Likewise.
	(walk_tree_1): Handle OMP_CLAUSE_FILTER.
	* tree-nested.c (convert_nonlocal_omp_clauses,
	convert_local_omp_clauses): Handle OMP_CLAUSE_FILTER.
	(convert_nonlocal_reference_stmt, convert_local_reference_stmt,
	convert_gimple_call): Handle GIMPLE_OMP_MASTER.
	* tree-pretty-print.c (dump_omp_clause): Handle OMP_CLAUSE_FILTER.
	(dump_generic_node): Handle OMP_MASTER.
	* gimple.def (GIMPLE_OMP_MASKED): New gimple code.
	* gimple.c (gimple_build_omp_masked): New function.
	(gimple_copy): Handle GIMPLE_OMP_MASKED.
	* gimple.h (gimple_build_omp_masked): Declare.
	(gimple_has_substatements): Handle GIMPLE_OMP_MASKED.
	(gimple_omp_masked_clauses, gimple_omp_masked_clauses_ptr,
	gimple_omp_masked_set_clauses): New inline functions.
	(CASE_GIMPLE_OMP): Add GIMPLE_OMP_MASKED.
	* gimple-pretty-print.c (dump_gimple_omp_masked): New function.
	(pp_gimple_stmt_1): Handle GIMPLE_OMP_MASKED.
	* gimple-walk.c (walk_gimple_stmt): Likewise.
	* gimple-low.c (lower_stmt): Likewise.
	* gimplify.c (is_gimple_stmt): Handle OMP_MASTER.
	(gimplify_scan_omp_clauses): Handle OMP_CLAUSE_FILTER.  For clauses
	that take one expression rather than decl or constant, force
	gimplification of that into a SSA_NAME or temporary unless min
	invariant.
	(gimplify_adjust_omp_clauses): Handle OMP_CLAUSE_FILTER.
	(gimplify_expr): Handle OMP_MASKED.
	* tree-inline.c (remap_gimple_stmt): Handle GIMPLE_OMP_MASKED.
	(estimate_num_insns): Likewise.
	* omp-low.c (scan_sharing_clauses): Handle OMP_CLAUSE_FILTER.
	(check_omp_nesting_restrictions): Handle GIMPLE_OMP_MASKED.  Adjust
	diagnostics for existence of masked construct.
	(scan_omp_1_stmt, lower_omp_master, lower_omp_1, diagnose_sb_1,
	diagnose_sb_2): Handle GIMPLE_OMP_MASKED.
	* omp-expand.c (expand_omp_synch, expand_omp, omp_make_gimple_edges):
	Likewise.
gcc/c-family/
	* c-pragma.h (enum pragma_kind): Add PRAGMA_OMP_MASKED.
	(enum pragma_omp_clause): Add PRAGMA_OMP_CLAUSE_FILTER.
	* c-pragma.c (omp_pragmas_simd): Add masked construct.
	* c-common.h (enum c_omp_clause_split): Add C_OMP_CLAUSE_SPLIT_MASKED
	enumerator.
	(c_finish_omp_masked): Declare.
	* c-omp.c (c_finish_omp_masked): New function.
	(c_omp_split_clauses): Handle combined masked constructs.
gcc/c/
	* c-parser.c (c_parser_omp_clause_name): Parse filter clause name.
	(c_parser_omp_clause_filter): New function.
	(c_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_FILTER.
	(OMP_MASKED_CLAUSE_MASK): Define.
	(c_parser_omp_masked): New function.
	(c_parser_omp_parallel): Handle parallel masked.
	(c_parser_omp_construct): Handle PRAGMA_OMP_MASKED.
	* c-typeck.c (c_finish_omp_clauses): Handle OMP_CLAUSE_FILTER.
gcc/cp/
	* parser.c (cp_parser_omp_clause_name): Parse filter clause name.
	(cp_parser_omp_clause_filter): New function.
	(cp_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_FILTER.
	(OMP_MASKED_CLAUSE_MASK): Define.
	(cp_parser_omp_masked): New function.
	(cp_parser_omp_parallel): Handle parallel masked.
	(cp_parser_omp_construct, cp_parser_pragma): Handle PRAGMA_OMP_MASKED.
	* semantics.c (finish_omp_clauses): Handle OMP_CLAUSE_FILTER.
	* pt.c (tsubst_omp_clauses): Likewise.
	(tsubst_expr): Handle OMP_MASKED.
gcc/testsuite/
	* c-c++-common/gomp/clauses-1.c (bar): Add tests for combined masked
	constructs with clauses.
	* c-c++-common/gomp/clauses-5.c (foo): Add testcase for filter clause.
	* c-c++-common/gomp/clause-dups-1.c (f1): Likewise.
	* c-c++-common/gomp/masked-1.c: New test.
	* c-c++-common/gomp/masked-2.c: New test.
	* c-c++-common/gomp/masked-combined-1.c: New test.
	* c-c++-common/gomp/masked-combined-2.c: New test.
	* c-c++-common/goacc/uninit-if-clause.c: Remove xfails.
	* g++.dg/gomp/block-11.C: New test.
	* g++.dg/gomp/tpl-masked-1.C: New test.
	* g++.dg/gomp/attrs-1.C (bar): Add tests for masked construct and
	combined masked constructs with clauses in attribute syntax.
	* g++.dg/gomp/attrs-2.C (bar): Likewise.
	* gcc.dg/gomp/nesting-1.c (f1, f2): Add tests for masked construct
	nesting.
	* gfortran.dg/goacc/host_data-tree.f95: Allow also SSA_NAMEs in if
	clause.
	* gfortran.dg/goacc/kernels-tree.f95: Likewise.
libgomp/
	* testsuite/libgomp.c-c++-common/masked-1.c: New test.

41 files changed, 969 insertions, 40 deletions

diff --git a/gcc/c-family/c-common.h b/gcc/c-family/c-common.h
index 65d8c1c..025123a 100644
--- a/gcc/c-family/c-common.h
+++ b/gcc/c-family/c-common.h
@@ -1201,7 +1201,8 @@ enum c_omp_clause_split
   C_OMP_CLAUSE_SPLIT_COUNT,
   C_OMP_CLAUSE_SPLIT_SECTIONS = C_OMP_CLAUSE_SPLIT_FOR,
   C_OMP_CLAUSE_SPLIT_TASKLOOP = C_OMP_CLAUSE_SPLIT_FOR,
-  C_OMP_CLAUSE_SPLIT_LOOP = C_OMP_CLAUSE_SPLIT_FOR
+  C_OMP_CLAUSE_SPLIT_LOOP = C_OMP_CLAUSE_SPLIT_FOR,
+  C_OMP_CLAUSE_SPLIT_MASKED = C_OMP_CLAUSE_SPLIT_DISTRIBUTE
 };
 
 enum c_omp_region_type
@@ -1215,6 +1216,7 @@ enum c_omp_region_type
 };
 
 extern tree c_finish_omp_master (location_t, tree);
+extern tree c_finish_omp_masked (location_t, tree, tree);
 extern tree c_finish_omp_taskgroup (location_t, tree, tree);
 extern tree c_finish_omp_critical (location_t, tree, tree, tree);
 extern tree c_finish_omp_ordered (location_t, tree, tree);
diff --git a/gcc/c-family/c-omp.c b/gcc/c-family/c-omp.c
index e70974d..54eba61 100644
--- a/gcc/c-family/c-omp.c
+++ b/gcc/c-family/c-omp.c
@@ -86,6 +86,20 @@ c_finish_omp_master (location_t loc, tree stmt)
   return t;
 }
 
+/* Complete a #pragma omp masked construct.  BODY is the structured-block
+   that follows the pragma.  LOC is the location of the #pragma.  */
+
+tree
+c_finish_omp_masked (location_t loc, tree body, tree clauses)
+{
+  tree stmt = make_node (OMP_MASKED);
+  TREE_TYPE (stmt) = void_type_node;
+  OMP_MASKED_BODY (stmt) = body;
+  OMP_MASKED_CLAUSES (stmt) = clauses;
+  SET_EXPR_LOCATION (stmt, loc);
+  return add_stmt (stmt);
+}
+
 /* Complete a #pragma omp taskgroup construct.  BODY is the structured-block
    that follows the pragma.  LOC is the location of the #pragma.  */
 
@@ -1542,11 +1556,16 @@ c_oacc_split_loop_clauses (tree clauses, tree *not_loop_clauses,
    #pragma omp distribute parallel for simd
    #pragma omp distribute simd
    #pragma omp for simd
+   #pragma omp masked taskloop
+   #pragma omp masked taskloop simd
    #pragma omp master taskloop
    #pragma omp master taskloop simd
    #pragma omp parallel for
    #pragma omp parallel for simd
    #pragma omp parallel loop
+   #pragma omp parallel masked
+   #pragma omp parallel masked taskloop
+   #pragma omp parallel masked taskloop simd
    #pragma omp parallel master
    #pragma omp parallel master taskloop
    #pragma omp parallel master taskloop simd
@@ -1651,6 +1670,9 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
 	case OMP_CLAUSE_BIND:
 	  s = C_OMP_CLAUSE_SPLIT_LOOP;
 	  break;
+	case OMP_CLAUSE_FILTER:
+	  s = C_OMP_CLAUSE_SPLIT_MASKED;
+	  break;
 	/* Duplicate this to all of taskloop, distribute, for, simd and
 	   loop.  */
 	case OMP_CLAUSE_COLLAPSE:
@@ -1700,10 +1722,10 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
 	  else
 	    s = C_OMP_CLAUSE_SPLIT_DISTRIBUTE;
 	  break;
-	/* Private clause is supported on all constructs but master,
-	   it is enough to put it on the innermost one other than master.  For
-	   #pragma omp {for,sections} put it on parallel though,
-	   as that's what we did for OpenMP 3.1.  */
+	/* Private clause is supported on all constructs but master/masked,
+	   it is enough to put it on the innermost one other than
+	   master/masked.  For #pragma omp {for,sections} put it on parallel
+	   though, as that's what we did for OpenMP 3.1.  */
 	case OMP_CLAUSE_PRIVATE:
 	  switch (code)
 	    {
@@ -1713,14 +1735,15 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
 	    case OMP_DISTRIBUTE: s = C_OMP_CLAUSE_SPLIT_DISTRIBUTE; break;
 	    case OMP_TEAMS: s = C_OMP_CLAUSE_SPLIT_TEAMS; break;
 	    case OMP_MASTER: s = C_OMP_CLAUSE_SPLIT_PARALLEL; break;
+	    case OMP_MASKED: s = C_OMP_CLAUSE_SPLIT_PARALLEL; break;
 	    case OMP_TASKLOOP: s = C_OMP_CLAUSE_SPLIT_TASKLOOP; break;
 	    case OMP_LOOP: s = C_OMP_CLAUSE_SPLIT_LOOP; break;
 	    default: gcc_unreachable ();
 	    }
 	  break;
 	/* Firstprivate clause is supported on all constructs but
-	   simd, master and loop.  Put it on the outermost of those and
-	   duplicate on teams and parallel.  */
+	   simd, master, masked and loop.  Put it on the outermost of those
+	   and duplicate on teams and parallel.  */
 	case OMP_CLAUSE_FIRSTPRIVATE:
 	  if ((mask & (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_MAP))
 	      != 0)
@@ -1773,7 +1796,7 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
 	      else if ((mask & (OMP_CLAUSE_MASK_1
 				<< PRAGMA_OMP_CLAUSE_NOGROUP)) != 0)
 		/* This must be
-		   #pragma omp parallel master taskloop{, simd}.  */
+		   #pragma omp parallel mas{ked,ter} taskloop{, simd}.  */
 		s = C_OMP_CLAUSE_SPLIT_TASKLOOP;
 	      else
 		/* This must be
@@ -1805,9 +1828,10 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
 	  else if ((mask & (OMP_CLAUSE_MASK_1
 			    << PRAGMA_OMP_CLAUSE_NOGROUP)) != 0)
 	    {
-	      /* This must be #pragma omp {,{,parallel }master }taskloop simd
+	      /* This must be
+		 #pragma omp {,{,parallel }mas{ked,ter} }taskloop simd
 		 or
-		 #pragma omp {,parallel }master taskloop.  */
+		 #pragma omp {,parallel }mas{ked,ter} taskloop.  */
 	      gcc_assert (code == OMP_SIMD || code == OMP_TASKLOOP);
 	      s = C_OMP_CLAUSE_SPLIT_TASKLOOP;
 	    }
@@ -2044,7 +2068,8 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
 	    }
 	  else if (code == OMP_SECTIONS
 		   || code == OMP_PARALLEL
-		   || code == OMP_MASTER)
+		   || code == OMP_MASTER
+		   || code == OMP_MASKED)
 	    s = C_OMP_CLAUSE_SPLIT_PARALLEL;
 	  else if (code == OMP_TASKLOOP)
 	    s = C_OMP_CLAUSE_SPLIT_TASKLOOP;
@@ -2455,7 +2480,8 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
     gcc_assert (cclauses[C_OMP_CLAUSE_SPLIT_TARGET] == NULL_TREE);
   if ((mask & (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NUM_TEAMS)) == 0)
     gcc_assert (cclauses[C_OMP_CLAUSE_SPLIT_TEAMS] == NULL_TREE);
-  if ((mask & (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DIST_SCHEDULE)) == 0)
+  if ((mask & (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_DIST_SCHEDULE)) == 0
+      && (mask & (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FILTER)) == 0)
     gcc_assert (cclauses[C_OMP_CLAUSE_SPLIT_DISTRIBUTE] == NULL_TREE);
   if ((mask & (OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_NUM_THREADS)) == 0)
     gcc_assert (cclauses[C_OMP_CLAUSE_SPLIT_PARALLEL] == NULL_TREE);
@@ -2975,8 +3001,8 @@ static const struct c_omp_directive omp_directives[] = {
     C_OMP_DIR_STANDALONE, false },  */
   { "loop", nullptr, nullptr, PRAGMA_OMP_LOOP,
     C_OMP_DIR_CONSTRUCT, true },
-  /* { "masked", nullptr, nullptr, PRAGMA_OMP_MASKED,
-    C_OMP_DIR_CONSTRUCT, true },  */
+  { "masked", nullptr, nullptr, PRAGMA_OMP_MASKED,
+    C_OMP_DIR_CONSTRUCT, true },
   { "master", nullptr, nullptr, PRAGMA_OMP_MASTER,
     C_OMP_DIR_CONSTRUCT, true },
   /* { "metadirective", nullptr, nullptr, PRAGMA_OMP_METADIRECTIVE,
diff --git a/gcc/c-family/c-pragma.c b/gcc/c-family/c-pragma.c
index f46b5b9..b466a27 100644
--- a/gcc/c-family/c-pragma.c
+++ b/gcc/c-family/c-pragma.c
@@ -1343,6 +1343,7 @@ static const struct omp_pragma_def omp_pragmas_simd[] = {
   { "distribute", PRAGMA_OMP_DISTRIBUTE },
   { "for", PRAGMA_OMP_FOR },
   { "loop", PRAGMA_OMP_LOOP },
+  { "masked", PRAGMA_OMP_MASKED },
   { "master", PRAGMA_OMP_MASTER },
   { "ordered", PRAGMA_OMP_ORDERED },
   { "parallel", PRAGMA_OMP_PARALLEL },
diff --git a/gcc/c-family/c-pragma.h b/gcc/c-family/c-pragma.h
index abd6667..b7ec6e5 100644
--- a/gcc/c-family/c-pragma.h
+++ b/gcc/c-family/c-pragma.h
@@ -57,6 +57,7 @@ enum pragma_kind {
   PRAGMA_OMP_FLUSH,
   PRAGMA_OMP_FOR,
   PRAGMA_OMP_LOOP,
+  PRAGMA_OMP_MASKED,
   PRAGMA_OMP_MASTER,
   PRAGMA_OMP_ORDERED,
   PRAGMA_OMP_PARALLEL,
@@ -104,6 +105,7 @@ enum pragma_omp_clause {
   PRAGMA_OMP_CLAUSE_DEVICE,
   PRAGMA_OMP_CLAUSE_DEVICE_TYPE,
   PRAGMA_OMP_CLAUSE_DIST_SCHEDULE,
+  PRAGMA_OMP_CLAUSE_FILTER,
   PRAGMA_OMP_CLAUSE_FINAL,
   PRAGMA_OMP_CLAUSE_FIRSTPRIVATE,
   PRAGMA_OMP_CLAUSE_FOR,
diff --git a/gcc/c/c-parser.c b/gcc/c/c-parser.c
index 195c137..ca6e56a 100644
--- a/gcc/c/c-parser.c
+++ b/gcc/c/c-parser.c
@@ -12696,7 +12696,9 @@ c_parser_omp_clause_name (c_parser *parser)
 	    result = PRAGMA_OMP_CLAUSE_DIST_SCHEDULE;
 	  break;
 	case 'f':
-	  if (!strcmp ("final", p))
+	  if (!strcmp ("filter", p))
+	    result = PRAGMA_OMP_CLAUSE_FILTER;
+	  else if (!strcmp ("final", p))
 	    result = PRAGMA_OMP_CLAUSE_FINAL;
 	  else if (!strcmp ("finalize", p))
 	    result = PRAGMA_OACC_CLAUSE_FINALIZE;
@@ -13948,6 +13950,38 @@ c_parser_omp_clause_hint (c_parser *parser, tree list)
   return list;
 }
 
+/* OpenMP 5.1:
+   filter ( integer-expression ) */
+
+static tree
+c_parser_omp_clause_filter (c_parser *parser, tree list)
+{
+  location_t hint_loc = c_parser_peek_token (parser)->location;
+  matching_parens parens;
+  if (parens.require_open (parser))
+    {
+      location_t expr_loc = c_parser_peek_token (parser)->location;
+      c_expr expr = c_parser_expr_no_commas (parser, NULL);
+      expr = convert_lvalue_to_rvalue (expr_loc, expr, false, true);
+      tree c, t = expr.value;
+      t = c_fully_fold (t, false, NULL);
+      if (!INTEGRAL_TYPE_P (TREE_TYPE (t)))
+	{
+	  c_parser_error (parser, "expected integer expression");
+	  return list;
+	}
+      parens.skip_until_found_close (parser);
+      check_no_duplicate_clause (list, OMP_CLAUSE_FILTER, "filter");
+
+      c = build_omp_clause (hint_loc, OMP_CLAUSE_FILTER);
+      OMP_CLAUSE_FILTER_EXPR (c) = t;
+      OMP_CLAUSE_CHAIN (c) = list;
+      list = c;
+    }
+
+  return list;
+}
+
 /* OpenMP 4.5:
    defaultmap ( tofrom : scalar )
 
@@ -16410,6 +16444,10 @@ c_parser_omp_all_clauses (c_parser *parser, omp_clause_mask mask,
 	  clauses = c_parser_omp_clause_detach (parser, clauses);
 	  c_name = "detach";
 	  break;
+	case PRAGMA_OMP_CLAUSE_FILTER:
+	  clauses = c_parser_omp_clause_filter (parser, clauses);
+	  c_name = "filter";
+	  break;
 	case PRAGMA_OMP_CLAUSE_FIRSTPRIVATE:
 	  clauses = c_parser_omp_clause_firstprivate (parser, clauses);
 	  c_name = "firstprivate";
@@ -18975,6 +19013,70 @@ c_parser_omp_master (location_t loc, c_parser *parser,
 								  if_p));
 }
 
+/* OpenMP 5.1:
+   # pragma omp masked masked-clauses new-line
+     structured-block
+
+   LOC is the location of the #pragma token.
+*/
+
+#define OMP_MASKED_CLAUSE_MASK					\
+	(OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FILTER)
+
+static tree
+c_parser_omp_masked (location_t loc, c_parser *parser,
+		     char *p_name, omp_clause_mask mask, tree *cclauses,
+		     bool *if_p)
+{
+  tree block, clauses, ret;
+
+  strcat (p_name, " masked");
+  mask |= OMP_MASKED_CLAUSE_MASK;
+
+  if (c_parser_next_token_is (parser, CPP_NAME))
+    {
+      const char *p = IDENTIFIER_POINTER (c_parser_peek_token (parser)->value);
+
+      if (strcmp (p, "taskloop") == 0)
+	{
+	  tree cclauses_buf[C_OMP_CLAUSE_SPLIT_COUNT];
+	  if (cclauses == NULL)
+	    cclauses = cclauses_buf;
+
+	  c_parser_consume_token (parser);
+	  if (!flag_openmp)  /* flag_openmp_simd  */
+	    return c_parser_omp_taskloop (loc, parser, p_name, mask, cclauses,
+					  if_p);
+	  block = c_begin_compound_stmt (true);
+	  ret = c_parser_omp_taskloop (loc, parser, p_name, mask, cclauses,
+				       if_p);
+	  block = c_end_compound_stmt (loc, block, true);
+	  if (ret == NULL_TREE)
+	    return ret;
+	  ret = c_finish_omp_masked (loc, block,
+				     cclauses[C_OMP_CLAUSE_SPLIT_MASKED]);
+	  OMP_MASKED_COMBINED (ret) = 1;
+	  return ret;
+	}
+    }
+  if (!flag_openmp)  /* flag_openmp_simd  */
+    {
+      c_parser_skip_to_pragma_eol (parser, false);
+      return NULL_TREE;
+    }
+
+  clauses = c_parser_omp_all_clauses (parser, mask, p_name, cclauses == NULL);
+  if (cclauses)
+    {
+      omp_split_clauses (loc, OMP_MASKED, mask, clauses, cclauses);
+      clauses = cclauses[C_OMP_CLAUSE_SPLIT_MASKED];
+    }
+
+  return c_finish_omp_masked (loc, c_parser_omp_structured_block (parser,
+								  if_p),
+			      clauses);
+}
+
 /* OpenMP 2.5:
    # pragma omp ordered new-line
      structured-block
@@ -19237,7 +19339,36 @@ c_parser_omp_parallel (location_t loc, c_parser *parser,
   else if (c_parser_next_token_is (parser, CPP_NAME))
     {
       const char *p = IDENTIFIER_POINTER (c_parser_peek_token (parser)->value);
-      if (cclauses == NULL && strcmp (p, "master") == 0)
+      if (cclauses == NULL && strcmp (p, "masked") == 0)
+	{
+	  tree cclauses_buf[C_OMP_CLAUSE_SPLIT_COUNT];
+	  cclauses = cclauses_buf;
+
+	  c_parser_consume_token (parser);
+	  if (!flag_openmp)  /* flag_openmp_simd  */
+	    return c_parser_omp_masked (loc, parser, p_name, mask, cclauses,
+					if_p);
+	  block = c_begin_omp_parallel ();
+	  tree ret = c_parser_omp_masked (loc, parser, p_name, mask, cclauses,
+					  if_p);
+	  stmt = c_finish_omp_parallel (loc,
+					cclauses[C_OMP_CLAUSE_SPLIT_PARALLEL],
+					block);
+	  if (ret == NULL)
+	    return ret;
+	  /* masked does have just filter clause, but during gimplification
+	     isn't represented by a gimplification omp context, so for
+	     #pragma omp parallel masked don't set OMP_PARALLEL_COMBINED,
+	     so that
+	     #pragma omp parallel masked
+	     #pragma omp taskloop simd lastprivate (x)
+	     isn't confused with
+	     #pragma omp parallel masked taskloop simd lastprivate (x)  */
+	  if (OMP_MASKED_COMBINED (ret))
+	    OMP_PARALLEL_COMBINED (stmt) = 1;
+	  return stmt;
+	}
+      else if (cclauses == NULL && strcmp (p, "master") == 0)
 	{
 	  tree cclauses_buf[C_OMP_CLAUSE_SPLIT_COUNT];
 	  cclauses = cclauses_buf;
@@ -21815,6 +21946,10 @@ c_parser_omp_construct (c_parser *parser, bool *if_p)
       strcpy (p_name, "#pragma omp");
       stmt = c_parser_omp_loop (loc, parser, p_name, mask, NULL, if_p);
       break;
+    case PRAGMA_OMP_MASKED:
+      strcpy (p_name, "#pragma omp");
+      stmt = c_parser_omp_masked (loc, parser, p_name, mask, NULL, if_p);
+      break;
     case PRAGMA_OMP_MASTER:
       strcpy (p_name, "#pragma omp");
       stmt = c_parser_omp_master (loc, parser, p_name, mask, NULL, if_p);
diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c
index eb5c87d..0c07af61 100644
--- a/gcc/c/c-typeck.c
+++ b/gcc/c/c-typeck.c
@@ -15158,6 +15158,7 @@ c_finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	case OMP_CLAUSE_THREADS:
 	case OMP_CLAUSE_SIMD:
 	case OMP_CLAUSE_HINT:
+	case OMP_CLAUSE_FILTER:
 	case OMP_CLAUSE_DEFAULTMAP:
 	case OMP_CLAUSE_BIND:
 	case OMP_CLAUSE_NUM_GANGS:
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index b7fe4b4..edb69ae 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -36004,7 +36004,9 @@ cp_parser_omp_clause_name (cp_parser *parser)
 	    result = PRAGMA_OMP_CLAUSE_DIST_SCHEDULE;
 	  break;
 	case 'f':
-	  if (!strcmp ("final", p))
+	  if (!strcmp ("filter", p))
+	    result = PRAGMA_OMP_CLAUSE_FILTER;
+	  else if (!strcmp ("final", p))
 	    result = PRAGMA_OMP_CLAUSE_FINAL;
 	  else if (!strcmp ("finalize", p))
 	    result = PRAGMA_OACC_CLAUSE_FINALIZE;
@@ -37340,6 +37342,34 @@ cp_parser_omp_clause_hint (cp_parser *parser, tree list, location_t location)
   return c;
 }
 
+/* OpenMP 5.1:
+   filter ( integer-expression ) */
+
+static tree
+cp_parser_omp_clause_filter (cp_parser *parser, tree list, location_t location)
+{
+  tree t, c;
+
+  matching_parens parens;
+  if (!parens.require_open (parser))
+    return list;
+
+  t = cp_parser_assignment_expression (parser);
+
+  if (t == error_mark_node
+      || !parens.require_close (parser))
+    cp_parser_skip_to_closing_parenthesis (parser, /*recovering=*/true,
+					   /*or_comma=*/false,
+					   /*consume_paren=*/true);
+  check_no_duplicate_clause (list, OMP_CLAUSE_FILTER, "filter", location);
+
+  c = build_omp_clause (location, OMP_CLAUSE_FILTER);
+  OMP_CLAUSE_FILTER_EXPR (c) = t;
+  OMP_CLAUSE_CHAIN (c) = list;
+
+  return c;
+}
+
 /* OpenMP 4.5:
    defaultmap ( tofrom : scalar )
 
@@ -39449,6 +39479,11 @@ cp_parser_omp_all_clauses (cp_parser *parser, omp_clause_mask mask,
 						  token->location, false);
 	  c_name = "default";
 	  break;
+	case PRAGMA_OMP_CLAUSE_FILTER:
+	  clauses = cp_parser_omp_clause_filter (parser, clauses,
+						 token->location);
+	  c_name = "filter";
+	  break;
 	case PRAGMA_OMP_CLAUSE_FINAL:
 	  clauses = cp_parser_omp_clause_final (parser, clauses, token->location);
 	  c_name = "final";
@@ -41985,6 +42020,73 @@ cp_parser_omp_master (cp_parser *parser, cp_token *pragma_tok,
 			      cp_parser_omp_structured_block (parser, if_p));
 }
 
+/* OpenMP 5.1:
+   # pragma omp masked masked-clauses new-line
+     structured-block  */
+
+#define OMP_MASKED_CLAUSE_MASK					\
+	(OMP_CLAUSE_MASK_1 << PRAGMA_OMP_CLAUSE_FILTER)
+
+static tree
+cp_parser_omp_masked (cp_parser *parser, cp_token *pragma_tok,
+		      char *p_name, omp_clause_mask mask, tree *cclauses,
+		      bool *if_p)
+{
+  tree clauses, sb, ret;
+  unsigned int save;
+  location_t loc = cp_lexer_peek_token (parser->lexer)->location;
+
+  strcat (p_name, " masked");
+  mask |= OMP_MASKED_CLAUSE_MASK;
+
+  if (cp_lexer_next_token_is (parser->lexer, CPP_NAME))
+    {
+      tree id = cp_lexer_peek_token (parser->lexer)->u.value;
+      const char *p = IDENTIFIER_POINTER (id);
+
+      if (strcmp (p, "taskloop") == 0)
+	{
+	  tree cclauses_buf[C_OMP_CLAUSE_SPLIT_COUNT];
+	  if (cclauses == NULL)
+	    cclauses = cclauses_buf;
+
+	  cp_lexer_consume_token (parser->lexer);
+	  if (!flag_openmp)  /* flag_openmp_simd  */
+	    return cp_parser_omp_taskloop (parser, pragma_tok, p_name, mask,
+					   cclauses, if_p);
+	  sb = begin_omp_structured_block ();
+	  save = cp_parser_begin_omp_structured_block (parser);
+	  ret = cp_parser_omp_taskloop (parser, pragma_tok, p_name, mask,
+					cclauses, if_p);
+	  cp_parser_end_omp_structured_block (parser, save);
+	  tree body = finish_omp_structured_block (sb);
+	  if (ret == NULL)
+	    return ret;
+	  ret = c_finish_omp_masked (loc, body,
+				     cclauses[C_OMP_CLAUSE_SPLIT_MASKED]);
+	  OMP_MASKED_COMBINED (ret) = 1;
+	  return ret;
+	}
+    }
+  if (!flag_openmp)  /* flag_openmp_simd  */
+    {
+      cp_parser_skip_to_pragma_eol (parser, pragma_tok);
+      return NULL_TREE;
+    }
+
+  clauses = cp_parser_omp_all_clauses (parser, mask, p_name, pragma_tok,
+				       cclauses == NULL);
+  if (cclauses)
+    {
+      cp_omp_split_clauses (loc, OMP_MASTER, mask, clauses, cclauses);
+      clauses = cclauses[C_OMP_CLAUSE_SPLIT_MASKED];
+    }
+
+  return c_finish_omp_masked (loc,
+			      cp_parser_omp_structured_block (parser, if_p),
+			      clauses);
+}
+
 /* OpenMP 2.5:
    # pragma omp ordered new-line
      structured-block
@@ -42238,7 +42340,37 @@ cp_parser_omp_parallel (cp_parser *parser, cp_token *pragma_tok,
     {
       tree id = cp_lexer_peek_token (parser->lexer)->u.value;
       const char *p = IDENTIFIER_POINTER (id);
-      if (cclauses == NULL && strcmp (p, "master") == 0)
+      if (cclauses == NULL && strcmp (p, "masked") == 0)
+	{
+	  tree cclauses_buf[C_OMP_CLAUSE_SPLIT_COUNT];
+	  cclauses = cclauses_buf;
+
+	  cp_lexer_consume_token (parser->lexer);
+	  if (!flag_openmp)  /* flag_openmp_simd  */
+	    return cp_parser_omp_masked (parser, pragma_tok, p_name, mask,
+					 cclauses, if_p);
+	  block = begin_omp_parallel ();
+	  save = cp_parser_begin_omp_structured_block (parser);
+	  tree ret = cp_parser_omp_masked (parser, pragma_tok, p_name, mask,
+					   cclauses, if_p);
+	  cp_parser_end_omp_structured_block (parser, save);
+	  stmt = finish_omp_parallel (cclauses[C_OMP_CLAUSE_SPLIT_PARALLEL],
+				      block);
+	  if (ret == NULL_TREE)
+	    return ret;
+	  /* masked does have just filter clause, but during gimplification
+	     isn't represented by a gimplification omp context, so for
+	     #pragma omp parallel masked don't set OMP_PARALLEL_COMBINED,
+	     so that
+	     #pragma omp parallel masked
+	     #pragma omp taskloop simd lastprivate (x)
+	     isn't confused with
+	     #pragma omp parallel masked taskloop simd lastprivate (x)  */
+	  if (OMP_MASKED_COMBINED (ret))
+	    OMP_PARALLEL_COMBINED (stmt) = 1;
+	  return stmt;
+	}
+      else if (cclauses == NULL && strcmp (p, "master") == 0)
 	{
 	  tree cclauses_buf[C_OMP_CLAUSE_SPLIT_COUNT];
 	  cclauses = cclauses_buf;
@@ -45824,6 +45956,11 @@ cp_parser_omp_construct (cp_parser *parser, cp_token *pragma_tok, bool *if_p)
       stmt = cp_parser_omp_loop (parser, pragma_tok, p_name, mask, NULL,
 				 if_p);
       break;
+    case PRAGMA_OMP_MASKED:
+      strcpy (p_name, "#pragma omp");
+      stmt = cp_parser_omp_masked (parser, pragma_tok, p_name, mask, NULL,
+				   if_p);
+      break;
     case PRAGMA_OMP_MASTER:
       strcpy (p_name, "#pragma omp");
       stmt = cp_parser_omp_master (parser, pragma_tok, p_name, mask, NULL,
@@ -46464,6 +46601,7 @@ cp_parser_pragma (cp_parser *parser, enum pragma_context context, bool *if_p)
     case PRAGMA_OMP_DISTRIBUTE:
     case PRAGMA_OMP_FOR:
     case PRAGMA_OMP_LOOP:
+    case PRAGMA_OMP_MASKED:
     case PRAGMA_OMP_MASTER:
     case PRAGMA_OMP_PARALLEL:
     case PRAGMA_OMP_SECTIONS:
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 42ea51c..0870ccd 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -17394,6 +17394,7 @@ tsubst_omp_clauses (tree clauses, enum c_omp_region_type ort,
 	case OMP_CLAUSE_PRIORITY:
 	case OMP_CLAUSE_ORDERED:
 	case OMP_CLAUSE_HINT:
+	case OMP_CLAUSE_FILTER:
 	case OMP_CLAUSE_NUM_GANGS:
 	case OMP_CLAUSE_NUM_WORKERS:
 	case OMP_CLAUSE_VECTOR_LENGTH:
@@ -18786,6 +18787,7 @@ tsubst_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl,
       break;
 
     case OMP_SECTIONS:
+    case OMP_MASKED:
       omp_parallel_combined_clauses = NULL;
       /* FALLTHRU */
     case OMP_SINGLE:
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index 2e23818..0198d2d 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -8204,6 +8204,29 @@ finish_omp_clauses (tree clauses, enum c_omp_region_type ort)
 	    }
 	  break;
 
+	case OMP_CLAUSE_FILTER:
+	  t = OMP_CLAUSE_FILTER_EXPR (c);
+	  if (t == error_mark_node)
+	    remove = true;
+	  else if (!type_dependent_expression_p (t)
+		   && !INTEGRAL_TYPE_P (TREE_TYPE (t)))
+	    {
+	      error_at (OMP_CLAUSE_LOCATION (c),
+			"%<filter%> expression must be integral");
+	      remove = true;
+	    }
+	  else
+	    {
+	      t = mark_rvalue_use (t);
+	      if (!processing_template_decl)
+		{
+		  t = maybe_constant_value (t);
+		  t = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
+		}
+	      OMP_CLAUSE_FILTER_EXPR (c) = t;
+	    }
+	  break;
+
 	case OMP_CLAUSE_IS_DEVICE_PTR:
 	case OMP_CLAUSE_USE_DEVICE_PTR:
 	  field_ok = (ort & C_ORT_OMP_DECLARE_SIMD) == C_ORT_OMP;
diff --git a/gcc/gimple-low.c b/gcc/gimple-low.c
index fa7d4de..832d5c3 100644
--- a/gcc/gimple-low.c
+++ b/gcc/gimple-low.c
@@ -334,6 +334,7 @@ lower_stmt (gimple_stmt_iterator *gsi, struct lower_data *data)
     case GIMPLE_OMP_SECTION:
     case GIMPLE_OMP_SINGLE:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_TASKGROUP:
     case GIMPLE_OMP_ORDERED:
     case GIMPLE_OMP_SCAN:
diff --git a/gcc/gimple-pretty-print.c b/gcc/gimple-pretty-print.c
index d6e63d6..1bccad1 100644
--- a/gcc/gimple-pretty-print.c
+++ b/gcc/gimple-pretty-print.c
@@ -1658,6 +1658,35 @@ dump_gimple_omp_taskgroup (pretty_printer *buffer, const gimple *gs,
     }
 }
 
+/* Dump a GIMPLE_OMP_MASKED tuple on the pretty_printer BUFFER.  */
+
+static void
+dump_gimple_omp_masked (pretty_printer *buffer, const gimple *gs,
+			int spc, dump_flags_t flags)
+{
+  if (flags & TDF_RAW)
+    {
+      dump_gimple_fmt (buffer, spc, flags, "%G <%+BODY <%S>%nCLAUSES <", gs,
+		       gimple_omp_body (gs));
+      dump_omp_clauses (buffer, gimple_omp_masked_clauses (gs), spc, flags);
+      dump_gimple_fmt (buffer, spc, flags, " >");
+    }
+  else
+    {
+      pp_string (buffer, "#pragma omp masked");
+      dump_omp_clauses (buffer, gimple_omp_masked_clauses (gs), spc, flags);
+      if (!gimple_seq_empty_p (gimple_omp_body (gs)))
+	{
+	  newline_and_indent (buffer, spc + 2);
+	  pp_left_brace (buffer);
+	  pp_newline (buffer);
+	  dump_gimple_seq (buffer, gimple_omp_body (gs), spc + 4, flags);
+	  newline_and_indent (buffer, spc + 2);
+	  pp_right_brace (buffer);
+	}
+    }
+}
+
 /* Dump a GIMPLE_OMP_TARGET tuple on the pretty_printer BUFFER.  */
 
 static void
@@ -2722,6 +2751,10 @@ pp_gimple_stmt_1 (pretty_printer *buffer, const gimple *gs, int spc,
       dump_gimple_omp_taskgroup (buffer, gs, spc, flags);
       break;
 
+    case GIMPLE_OMP_MASKED:
+      dump_gimple_omp_masked (buffer, gs, spc, flags);
+      break;
+
     case GIMPLE_OMP_MASTER:
     case GIMPLE_OMP_SECTION:
       dump_gimple_omp_block (buffer, gs, spc, flags);
diff --git a/gcc/gimple-walk.c b/gcc/gimple-walk.c
index 18884c4..9dd2e86 100644
--- a/gcc/gimple-walk.c
+++ b/gcc/gimple-walk.c
@@ -682,6 +682,7 @@ walk_gimple_stmt (gimple_stmt_iterator *gsi, walk_stmt_fn callback_stmt,
       /* FALL THROUGH.  */
     case GIMPLE_OMP_CRITICAL:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_TASKGROUP:
     case GIMPLE_OMP_ORDERED:
     case GIMPLE_OMP_SCAN:
diff --git a/gcc/gimple.c b/gcc/gimple.c
index 383da98..23bfc7f 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -1038,6 +1038,21 @@ gimple_build_omp_master (gimple_seq body)
   return p;
 }
 
+/* Build a GIMPLE_OMP_MASKED statement.
+
+   BODY is the sequence of statements to be executed by the selected thread(s).  */
+
+gimple *
+gimple_build_omp_masked (gimple_seq body, tree clauses)
+{
+  gimple *p = gimple_alloc (GIMPLE_OMP_MASKED, 0);
+  gimple_omp_masked_set_clauses (p, clauses);
+  if (body)
+    gimple_omp_set_body (p, body);
+
+  return p;
+}
+
 /* Build a GIMPLE_OMP_TASKGROUP statement.
 
    BODY is the sequence of statements to be executed by the taskgroup
@@ -2031,6 +2046,11 @@ gimple_copy (gimple *stmt)
 	  gimple_omp_set_body (copy, new_seq);
 	  break;
 
+	case GIMPLE_OMP_MASKED:
+	  t = unshare_expr (gimple_omp_masked_clauses (stmt));
+	  gimple_omp_masked_set_clauses (copy, t);
+	  goto copy_omp_body;
+
 	case GIMPLE_TRANSACTION:
 	  new_seq = gimple_seq_copy (gimple_transaction_body (
 				       as_a <gtransaction *> (stmt)));
diff --git a/gcc/gimple.def b/gcc/gimple.def
index 0ac0cf7..e66546c 100644
--- a/gcc/gimple.def
+++ b/gcc/gimple.def
@@ -279,6 +279,10 @@ DEFGSCODE(GIMPLE_OMP_FOR, "gimple_omp_for", GSS_OMP_FOR)
    BODY is the sequence of statements to execute in the master section.  */
 DEFGSCODE(GIMPLE_OMP_MASTER, "gimple_omp_master", GSS_OMP)
 
+/* GIMPLE_OMP_MASKED <BODY, CLAUSES> represents #pragma omp masked.
+   BODY is the sequence of statements to execute in the masked section.  */
+DEFGSCODE(GIMPLE_OMP_MASKED, "gimple_omp_masked", GSS_OMP_SINGLE_LAYOUT)
+
 /* GIMPLE_OMP_TASKGROUP <BODY, CLAUSES> represents #pragma omp taskgroup.
    BODY is the sequence of statements inside the taskgroup section.
    CLAUSES is an OMP_CLAUSE chain holding the associated clauses.  */
diff --git a/gcc/gimple.h b/gcc/gimple.h
index 31d7dd0..7fd483d 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -1560,6 +1560,7 @@ gomp_task *gimple_build_omp_task (gimple_seq, tree, tree, tree, tree,
 				       tree, tree);
 gimple *gimple_build_omp_section (gimple_seq);
 gimple *gimple_build_omp_master (gimple_seq);
+gimple *gimple_build_omp_masked (gimple_seq, tree);
 gimple *gimple_build_omp_taskgroup (gimple_seq, tree);
 gomp_continue *gimple_build_omp_continue (tree, tree);
 gomp_ordered *gimple_build_omp_ordered (gimple_seq, tree);
@@ -1836,6 +1837,7 @@ gimple_has_substatements (gimple *g)
     case GIMPLE_TRY:
     case GIMPLE_OMP_FOR:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_TASKGROUP:
     case GIMPLE_OMP_ORDERED:
     case GIMPLE_OMP_SECTION:
@@ -5205,6 +5207,40 @@ gimple_omp_taskgroup_set_clauses (gimple *gs, tree clauses)
 }
 
 
+/* Return the clauses associated with OMP_MASTER statement GS.  */
+
+static inline tree
+gimple_omp_masked_clauses (const gimple *gs)
+{
+  GIMPLE_CHECK (gs, GIMPLE_OMP_MASKED);
+  return
+    static_cast <const gimple_statement_omp_single_layout *> (gs)->clauses;
+}
+
+
+/* Return a pointer to the clauses associated with OMP masked statement
+   GS.  */
+
+static inline tree *
+gimple_omp_masked_clauses_ptr (gimple *gs)
+{
+  GIMPLE_CHECK (gs, GIMPLE_OMP_MASKED);
+  return &static_cast <gimple_statement_omp_single_layout *> (gs)->clauses;
+}
+
+
+/* Set CLAUSES to be the clauses associated with OMP masked statement
+   GS.  */
+
+static inline void
+gimple_omp_masked_set_clauses (gimple *gs, tree clauses)
+{
+  GIMPLE_CHECK (gs, GIMPLE_OMP_MASKED);
+  static_cast <gimple_statement_omp_single_layout *> (gs)->clauses
+    = clauses;
+}
+
+
 /* Return the kind of the OMP_FOR statemement G.  */
 
 static inline int
@@ -6493,6 +6529,7 @@ gimple_return_set_retval (greturn *gs, tree retval)
     case GIMPLE_OMP_TEAMS:			\
     case GIMPLE_OMP_SECTION:			\
     case GIMPLE_OMP_MASTER:			\
+    case GIMPLE_OMP_MASKED:			\
     case GIMPLE_OMP_TASKGROUP:			\
     case GIMPLE_OMP_ORDERED:			\
     case GIMPLE_OMP_CRITICAL:			\
diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index 21ff32e..eadbf83 100644
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -5632,6 +5632,7 @@ is_gimple_stmt (tree t)
     case OMP_SECTION:
     case OMP_SINGLE:
     case OMP_MASTER:
+    case OMP_MASKED:
     case OMP_TASKGROUP:
     case OMP_ORDERED:
     case OMP_CRITICAL:
@@ -10102,6 +10103,7 @@ gimplify_scan_omp_clauses (tree *list_p, gimple_seq *pre_p,
 	case OMP_CLAUSE_PRIORITY:
 	case OMP_CLAUSE_GRAINSIZE:
 	case OMP_CLAUSE_NUM_TASKS:
+	case OMP_CLAUSE_FILTER:
 	case OMP_CLAUSE_HINT:
 	case OMP_CLAUSE_ASYNC:
 	case OMP_CLAUSE_WAIT:
@@ -10110,9 +10112,20 @@ gimplify_scan_omp_clauses (tree *list_p, gimple_seq *pre_p,
 	case OMP_CLAUSE_VECTOR_LENGTH:
 	case OMP_CLAUSE_WORKER:
 	case OMP_CLAUSE_VECTOR:
-	  if (gimplify_expr (&OMP_CLAUSE_OPERAND (c, 0), pre_p, NULL,
-			     is_gimple_val, fb_rvalue) == GS_ERROR)
-	    remove = true;
+	  if (OMP_CLAUSE_OPERAND (c, 0)
+	      && !is_gimple_min_invariant (OMP_CLAUSE_OPERAND (c, 0)))
+	    {
+	      if (error_operand_p (OMP_CLAUSE_OPERAND (c, 0)))
+		{
+		  remove = true;
+		  break;
+		}
+	      /* All these clauses care about value, not a particular decl,
+		 so try to force it into a SSA_NAME or fresh temporary.  */
+	      OMP_CLAUSE_OPERAND (c, 0)
+		= get_initialized_tmp_var (OMP_CLAUSE_OPERAND (c, 0),
+					   pre_p, NULL, true);
+	    }
 	  break;
 
 	case OMP_CLAUSE_GANG:
@@ -11222,6 +11235,7 @@ gimplify_adjust_omp_clauses (gimple_seq *pre_p, gimple_seq body, tree *list_p,
 	case OMP_CLAUSE_NOGROUP:
 	case OMP_CLAUSE_THREADS:
 	case OMP_CLAUSE_SIMD:
+	case OMP_CLAUSE_FILTER:
 	case OMP_CLAUSE_HINT:
 	case OMP_CLAUSE_DEFAULTMAP:
 	case OMP_CLAUSE_ORDER:
@@ -14766,6 +14780,7 @@ gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
 
 	case OMP_SECTION:
 	case OMP_MASTER:
+	case OMP_MASKED:
 	case OMP_ORDERED:
 	case OMP_CRITICAL:
 	case OMP_SCAN:
@@ -14788,6 +14803,15 @@ gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
 	      case OMP_ORDERED:
 		g = gimplify_omp_ordered (*expr_p, body);
 		break;
+	      case OMP_MASKED:
+		gimplify_scan_omp_clauses (&OMP_MASKED_CLAUSES (*expr_p),
+					   pre_p, ORT_WORKSHARE, OMP_MASKED);
+		gimplify_adjust_omp_clauses (pre_p, body,
+					     &OMP_MASKED_CLAUSES (*expr_p),
+					     OMP_MASKED);
+		g = gimple_build_omp_masked (body,
+					     OMP_MASKED_CLAUSES (*expr_p));
+		break;
 	      case OMP_CRITICAL:
 		gimplify_scan_omp_clauses (&OMP_CRITICAL_CLAUSES (*expr_p),
 					   pre_p, ORT_WORKSHARE, OMP_CRITICAL);
@@ -15161,6 +15185,7 @@ gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
 		  && code != OMP_FOR
 		  && code != OACC_LOOP
 		  && code != OMP_MASTER
+		  && code != OMP_MASKED
 		  && code != OMP_TASKGROUP
 		  && code != OMP_ORDERED
 		  && code != OMP_PARALLEL
diff --git a/gcc/omp-expand.c b/gcc/omp-expand.c
index 9fd1c65..1d4b39e 100644
--- a/gcc/omp-expand.c
+++ b/gcc/omp-expand.c
@@ -8460,6 +8460,7 @@ expand_omp_synch (struct omp_region *region)
   si = gsi_last_nondebug_bb (entry_bb);
   gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_SINGLE
 	      || gimple_code (gsi_stmt (si)) == GIMPLE_OMP_MASTER
+	      || gimple_code (gsi_stmt (si)) == GIMPLE_OMP_MASKED
 	      || gimple_code (gsi_stmt (si)) == GIMPLE_OMP_TASKGROUP
 	      || gimple_code (gsi_stmt (si)) == GIMPLE_OMP_ORDERED
 	      || gimple_code (gsi_stmt (si)) == GIMPLE_OMP_CRITICAL
@@ -9947,6 +9948,7 @@ expand_omp (struct omp_region *region)
 	  }
 	  /* FALLTHRU */
 	case GIMPLE_OMP_MASTER:
+	case GIMPLE_OMP_MASKED:
 	case GIMPLE_OMP_TASKGROUP:
 	case GIMPLE_OMP_CRITICAL:
 	case GIMPLE_OMP_TEAMS:
@@ -10266,6 +10268,7 @@ omp_make_gimple_edges (basic_block bb, struct omp_region **region,
     case GIMPLE_OMP_SINGLE:
     case GIMPLE_OMP_TEAMS:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_TASKGROUP:
     case GIMPLE_OMP_CRITICAL:
     case GIMPLE_OMP_SECTION:
diff --git a/gcc/omp-low.c b/gcc/omp-low.c
index 926087d..22ba579 100644
--- a/gcc/omp-low.c
+++ b/gcc/omp-low.c
@@ -1466,6 +1466,7 @@ scan_sharing_clauses (tree clauses, omp_context *ctx)
 	case OMP_CLAUSE_NUM_WORKERS:
 	case OMP_CLAUSE_VECTOR_LENGTH:
 	case OMP_CLAUSE_DETACH:
+	case OMP_CLAUSE_FILTER:
 	  if (ctx->outer)
 	    scan_omp_op (&OMP_CLAUSE_OPERAND (c, 0), ctx->outer);
 	  break;
@@ -1868,6 +1869,7 @@ scan_sharing_clauses (tree clauses, omp_context *ctx)
 	case OMP_CLAUSE__SIMT_:
 	case OMP_CLAUSE_IF_PRESENT:
 	case OMP_CLAUSE_FINALIZE:
+	case OMP_CLAUSE_FILTER:
 	case OMP_CLAUSE__CONDTEMP_:
 	  break;
 
@@ -3426,6 +3428,7 @@ check_omp_nesting_restrictions (gimple *stmt, omp_context *ctx)
 	  case GIMPLE_OMP_SINGLE:
 	  case GIMPLE_OMP_ORDERED:
 	  case GIMPLE_OMP_MASTER:
+	  case GIMPLE_OMP_MASKED:
 	  case GIMPLE_OMP_TASK:
 	  case GIMPLE_OMP_CRITICAL:
 	    if (is_gimple_call (stmt))
@@ -3436,14 +3439,15 @@ check_omp_nesting_restrictions (gimple *stmt, omp_context *ctx)
 		error_at (gimple_location (stmt),
 			  "barrier region may not be closely nested inside "
 			  "of work-sharing, %<loop%>, %<critical%>, "
-			  "%<ordered%>, %<master%>, explicit %<task%> or "
-			  "%<taskloop%> region");
+			  "%<ordered%>, %<master%>, %<masked%>, explicit "
+			  "%<task%> or %<taskloop%> region");
 		return false;
 	      }
 	    error_at (gimple_location (stmt),
 		      "work-sharing region may not be closely nested inside "
 		      "of work-sharing, %<loop%>, %<critical%>, %<ordered%>, "
-		      "%<master%>, explicit %<task%> or %<taskloop%> region");
+		      "%<master%>, %<masked%>, explicit %<task%> or "
+		      "%<taskloop%> region");
 	    return false;
 	  case GIMPLE_OMP_PARALLEL:
 	  case GIMPLE_OMP_TEAMS:
@@ -3458,6 +3462,7 @@ check_omp_nesting_restrictions (gimple *stmt, omp_context *ctx)
 	  }
       break;
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
       for (; ctx != NULL; ctx = ctx->outer)
 	switch (gimple_code (ctx->stmt))
 	  {
@@ -3470,9 +3475,11 @@ check_omp_nesting_restrictions (gimple *stmt, omp_context *ctx)
 	  case GIMPLE_OMP_SINGLE:
 	  case GIMPLE_OMP_TASK:
 	    error_at (gimple_location (stmt),
-		      "%<master%> region may not be closely nested inside "
+		      "%qs region may not be closely nested inside "
 		      "of work-sharing, %<loop%>, explicit %<task%> or "
-		      "%<taskloop%> region");
+		      "%<taskloop%> region",
+		      gimple_code (stmt) == GIMPLE_OMP_MASTER
+		      ? "master" : "masked");
 	    return false;
 	  case GIMPLE_OMP_PARALLEL:
 	  case GIMPLE_OMP_TEAMS:
@@ -4079,6 +4086,12 @@ scan_omp_1_stmt (gimple_stmt_iterator *gsi, bool *handled_ops_p,
       scan_omp (gimple_omp_body_ptr (stmt), ctx);
       break;
 
+    case GIMPLE_OMP_MASKED:
+      ctx = new_omp_context (stmt, ctx);
+      scan_sharing_clauses (gimple_omp_masked_clauses (stmt), ctx);
+      scan_omp (gimple_omp_body_ptr (stmt), ctx);
+      break;
+
     case GIMPLE_OMP_TASKGROUP:
       ctx = new_omp_context (stmt, ctx);
       scan_sharing_clauses (gimple_omp_taskgroup_clauses (stmt), ctx);
@@ -8675,7 +8688,7 @@ lower_omp_single (gimple_stmt_iterator *gsi_p, omp_context *ctx)
 }
 
 
-/* Expand code for an OpenMP master directive.  */
+/* Expand code for an OpenMP master or masked directive.  */
 
 static void
 lower_omp_master (gimple_stmt_iterator *gsi_p, omp_context *ctx)
@@ -8685,9 +8698,20 @@ lower_omp_master (gimple_stmt_iterator *gsi_p, omp_context *ctx)
   gbind *bind;
   location_t loc = gimple_location (stmt);
   gimple_seq tseq;
+  tree filter = integer_zero_node;
 
   push_gimplify_context ();
 
+  if (gimple_code (stmt) == GIMPLE_OMP_MASKED)
+    {
+      filter = omp_find_clause (gimple_omp_masked_clauses (stmt),
+				OMP_CLAUSE_FILTER);
+      if (filter)
+	filter = fold_convert (integer_type_node,
+			       OMP_CLAUSE_FILTER_EXPR (filter));
+      else
+	filter = integer_zero_node;
+    }
   block = make_node (BLOCK);
   bind = gimple_build_bind (NULL, NULL, block);
   gsi_replace (gsi_p, bind, true);
@@ -8695,7 +8719,7 @@ lower_omp_master (gimple_stmt_iterator *gsi_p, omp_context *ctx)
 
   bfn_decl = builtin_decl_explicit (BUILT_IN_OMP_GET_THREAD_NUM);
   x = build_call_expr_loc (loc, bfn_decl, 0);
-  x = build2 (EQ_EXPR, boolean_type_node, x, integer_zero_node);
+  x = build2 (EQ_EXPR, boolean_type_node, x, filter);
   x = build3 (COND_EXPR, void_type_node, x, NULL, build_and_jump (&lab));
   tseq = NULL;
   gimplify_and_add (x, &tseq);
@@ -13869,6 +13893,7 @@ lower_omp_1 (gimple_stmt_iterator *gsi_p, omp_context *ctx)
       lower_omp_single (gsi_p, ctx);
       break;
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
       ctx = maybe_lookup_ctx (stmt);
       gcc_assert (ctx);
       lower_omp_master (gsi_p, ctx);
@@ -14246,6 +14271,7 @@ diagnose_sb_1 (gimple_stmt_iterator *gsi_p, bool *handled_ops_p,
     case GIMPLE_OMP_SINGLE:
     case GIMPLE_OMP_SECTION:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_ORDERED:
     case GIMPLE_OMP_SCAN:
     case GIMPLE_OMP_CRITICAL:
@@ -14307,6 +14333,7 @@ diagnose_sb_2 (gimple_stmt_iterator *gsi_p, bool *handled_ops_p,
     case GIMPLE_OMP_SINGLE:
     case GIMPLE_OMP_SECTION:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_ORDERED:
     case GIMPLE_OMP_SCAN:
     case GIMPLE_OMP_CRITICAL:
diff --git a/gcc/testsuite/c-c++-common/goacc/uninit-if-clause.c b/gcc/testsuite/c-c++-common/goacc/uninit-if-clause.c
index 7f78d72..683ac1b 100644
--- a/gcc/testsuite/c-c++-common/goacc/uninit-if-clause.c
+++ b/gcc/testsuite/c-c++-common/goacc/uninit-if-clause.c
@@ -1,6 +1,5 @@
 /* { dg-do compile } */
 /* { dg-additional-options "-Wuninitialized" } */
-/* { dg-excess-errors "PR70392" { xfail c++ } } */
 
 #include <stdbool.h>
 
@@ -14,25 +13,25 @@ main (void)
   #pragma acc parallel if(l) /* { dg-warning "is used uninitialized" } */
   ;
 
-  #pragma acc parallel if(b) /* { dg-warning "is used uninitialized" "" { xfail c++ } } */
+  #pragma acc parallel if(b) /* { dg-warning "is used uninitialized" } */
   ;
 
   #pragma acc kernels if(l2) /* { dg-warning "is used uninitialized" } */
   ;
 
-  #pragma acc kernels if(b2) /* { dg-warning "is used uninitialized" "" { xfail c++ } } */
+  #pragma acc kernels if(b2) /* { dg-warning "is used uninitialized" } */
   ;
 
   #pragma acc data if(l3) /* { dg-warning "is used uninitialized" } */
   ;
 
-  #pragma acc data if(b3) /* { dg-warning "is used uninitialized" "" { xfail c++ } } */
+  #pragma acc data if(b3) /* { dg-warning "is used uninitialized" } */
   ;
 
   #pragma acc update if(l4) self(i) /* { dg-warning "is used uninitialized" } */
   ;
 
-  #pragma acc update if(b4) self(i2) /* { dg-warning "is used uninitialized" "" { xfail c++ } } */
+  #pragma acc update if(b4) self(i2) /* { dg-warning "is used uninitialized" } */
   ;
 
 }
diff --git a/gcc/testsuite/c-c++-common/gomp/clause-dups-1.c b/gcc/testsuite/c-c++-common/gomp/clause-dups-1.c
index 3dde058..7b71ad3 100644
--- a/gcc/testsuite/c-c++-common/gomp/clause-dups-1.c
+++ b/gcc/testsuite/c-c++-common/gomp/clause-dups-1.c
@@ -203,7 +203,8 @@ f1 (int *p)
   i = p[0]++;
   #pragma omp atomic capture hint(0) hint (0)			/* { dg-error "too many 'hint' clauses" } */
   i = p[0]++;
-  
+  #pragma omp masked filter (0) filter (0)			/* { dg-error "too many 'filter' clauses" } */
+  f0 ();
 }
 
 #pragma omp declare simd simdlen (4) simdlen (4)		/* { dg-error "too many 'simdlen' clauses" } */
diff --git a/gcc/testsuite/c-c++-common/gomp/clauses-1.c b/gcc/testsuite/c-c++-common/gomp/clauses-1.c
index 682442af..378c7bf 100644
--- a/gcc/testsuite/c-c++-common/gomp/clauses-1.c
+++ b/gcc/testsuite/c-c++-common/gomp/clauses-1.c
@@ -273,6 +273,10 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
     private (p) firstprivate (f) if (parallel: i2) default(shared) shared(s) reduction(+:r) \
     num_threads (nth) proc_bind(spread) copyin(t) allocate (f)
     ;
+  #pragma omp parallel masked \
+    private (p) firstprivate (f) if (parallel: i2) default(shared) shared(s) reduction(+:r) \
+    num_threads (nth) proc_bind(spread) copyin(t) allocate (f) filter (d)
+    ;
   #pragma omp taskgroup task_reduction (+:r2) allocate (r2)
   #pragma omp master taskloop \
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) final(fi) mergeable priority (pp) \
@@ -280,23 +284,47 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
   for (int i = 0; i < 64; i++)
     ll++;
   #pragma omp taskgroup task_reduction (+:r2) allocate (r2)
+  #pragma omp masked taskloop \
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) final(fi) mergeable priority (pp) \
+    reduction(default, +:r) in_reduction(+:r2) allocate (f) filter (d)
+  for (int i = 0; i < 64; i++)
+    ll++;
+  #pragma omp taskgroup task_reduction (+:r2) allocate (r2)
   #pragma omp master taskloop simd \
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) if(simd: i2) final(fi) mergeable priority (pp) \
     safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) in_reduction(+:r2) nontemporal(ntm) \
     order(concurrent) allocate (f)
   for (int i = 0; i < 64; i++)
     ll++;
+  #pragma omp taskgroup task_reduction (+:r2) allocate (r2)
+  #pragma omp masked taskloop simd \
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) if(simd: i2) final(fi) mergeable priority (pp) \
+    safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) in_reduction(+:r2) nontemporal(ntm) \
+    order(concurrent) allocate (f) filter (d)
+  for (int i = 0; i < 64; i++)
+    ll++;
   #pragma omp parallel master taskloop \
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) final(fi) mergeable priority (pp) \
     reduction(default, +:r) if (parallel: i2) num_threads (nth) proc_bind(spread) copyin(t) allocate (f)
   for (int i = 0; i < 64; i++)
     ll++;
+  #pragma omp parallel masked taskloop \
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) final(fi) mergeable priority (pp) \
+    reduction(default, +:r) if (parallel: i2) num_threads (nth) proc_bind(spread) copyin(t) allocate (f) filter (d)
+  for (int i = 0; i < 64; i++)
+    ll++;
   #pragma omp parallel master taskloop simd \
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) if(simd: i2) final(fi) mergeable priority (pp) \
     safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) nontemporal(ntm) if (parallel: i2) num_threads (nth) proc_bind(spread) copyin(t) \
     order(concurrent) allocate (f)
   for (int i = 0; i < 64; i++)
     ll++;
+  #pragma omp parallel masked taskloop simd \
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) if(simd: i2) final(fi) mergeable priority (pp) \
+    safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) nontemporal(ntm) if (parallel: i2) num_threads (nth) proc_bind(spread) copyin(t) \
+    order(concurrent) allocate (f) filter (d)
+  for (int i = 0; i < 64; i++)
+    ll++;
   #pragma omp taskgroup task_reduction (+:r2) allocate (r2)
   #pragma omp master taskloop \
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp) \
@@ -304,23 +332,47 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
   for (int i = 0; i < 64; i++)
     ll++;
   #pragma omp taskgroup task_reduction (+:r2) allocate (r2)
+  #pragma omp mastked taskloop \
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp) \
+    reduction(default, +:r) in_reduction(+:r2) filter (d)
+  for (int i = 0; i < 64; i++)
+    ll++;
+  #pragma omp taskgroup task_reduction (+:r2) allocate (r2)
   #pragma omp master taskloop simd \
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp) \
     safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) in_reduction(+:r2) nontemporal(ntm) \
     order(concurrent) allocate (f)
   for (int i = 0; i < 64; i++)
     ll++;
+  #pragma omp taskgroup task_reduction (+:r2) allocate (r2)
+  #pragma omp masked taskloop simd \
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp) \
+    safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) in_reduction(+:r2) nontemporal(ntm) \
+    order(concurrent) allocate (f) filter (d)
+  for (int i = 0; i < 64; i++)
+    ll++;
   #pragma omp parallel master taskloop \
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp) \
     reduction(default, +:r) num_threads (nth) proc_bind(spread) copyin(t) allocate (f)
   for (int i = 0; i < 64; i++)
     ll++;
+  #pragma omp parallel masked taskloop \
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp) \
+    reduction(default, +:r) num_threads (nth) proc_bind(spread) copyin(t) allocate (f) filter (d)
+  for (int i = 0; i < 64; i++)
+    ll++;
   #pragma omp parallel master taskloop simd \
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp) \
     safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) nontemporal(ntm) num_threads (nth) proc_bind(spread) copyin(t) \
     order(concurrent) allocate (f)
   for (int i = 0; i < 64; i++)
     ll++;
+  #pragma omp parallel masked taskloop simd \
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp) \
+    safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) nontemporal(ntm) num_threads (nth) proc_bind(spread) copyin(t) \
+    order(concurrent) allocate (f) filter (d)
+  for (int i = 0; i < 64; i++)
+    ll++;
   #pragma omp loop bind(thread) order(concurrent) \
     private (p) lastprivate (l) collapse(1) reduction(+:r)
   for (l = 0; l < 64; ++l)
diff --git a/gcc/testsuite/c-c++-common/gomp/clauses-5.c b/gcc/testsuite/c-c++-common/gomp/clauses-5.c
index 35e16f0..87e53a9 100644
--- a/gcc/testsuite/c-c++-common/gomp/clauses-5.c
+++ b/gcc/testsuite/c-c++-common/gomp/clauses-5.c
@@ -49,4 +49,6 @@ foo (int *p)
   ;
   #pragma omp critical (baz) hint (2, 3)	/* { dg-error "expected" } */
   ;
+  #pragma omp masked filter (3, 4)		/* { dg-error "expected" } */
+  ;
 }
diff --git a/gcc/testsuite/c-c++-common/gomp/masked-1.c b/gcc/testsuite/c-c++-common/gomp/masked-1.c
new file mode 100644
index 0000000..36c2e49
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/gomp/masked-1.c
@@ -0,0 +1,23 @@
+void bar (void);
+
+void
+foo (int x, int *a)
+{
+  #pragma omp masked
+  bar ();
+  #pragma omp masked filter (0)
+  bar ();
+  #pragma omp masked filter (7)
+  bar ();
+  #pragma omp masked filter (x)
+  bar ();
+  #pragma omp masked taskloop simd filter (x) grainsize (12) simdlen (4)
+  for (int i = 0; i < 128; i++)
+    a[i] = i;
+  #pragma omp parallel masked filter (x) firstprivate (x)
+  bar ();
+  #pragma omp masked
+  #pragma omp masked filter (0)
+  #pragma omp masked filter (x)
+  ;
+}
diff --git a/gcc/testsuite/c-c++-common/gomp/masked-2.c b/gcc/testsuite/c-c++-common/gomp/masked-2.c
new file mode 100644
index 0000000..7230c82
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/gomp/masked-2.c
@@ -0,0 +1,11 @@
+void bar (void);
+struct S { int s; };
+
+void
+foo (float f, struct S s)
+{
+  #pragma omp masked filter (0.0)	/* { dg-error "integral|integer" } */
+  bar ();
+  #pragma omp masked filter (s)		/* { dg-error "integral|integer" } */
+  bar ();
+}
diff --git a/gcc/testsuite/c-c++-common/gomp/masked-combined-1.c b/gcc/testsuite/c-c++-common/gomp/masked-combined-1.c
new file mode 100644
index 0000000..0b3ff58
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/gomp/masked-combined-1.c
@@ -0,0 +1,37 @@
+void bar (int *);
+
+void
+foo (int *a, int f)
+{
+  int i, j, k, u = 0, v = 0, w = 0, x = 0, y = 0, z = 0;
+  #pragma omp parallel masked default(none) private (k) filter (f) firstprivate (f)
+  bar (&k);
+  #pragma omp parallel masked default(none) private (k)
+  bar (&k);
+  #pragma omp parallel default(none) firstprivate(a, f) shared(x, y, z)
+  {
+    #pragma omp masked taskloop reduction (+:x) default(none) firstprivate(a) filter (f)
+    for (i = 0; i < 64; i++)
+      x += a[i];
+    #pragma omp masked taskloop simd reduction (+:y) default(none) firstprivate(a) private (i) filter (f)
+    for (i = 0; i < 64; i++)
+      y += a[i];
+    #pragma omp masked taskloop simd reduction (+:y) default(none) firstprivate(a) private (i)
+    for (i = 0; i < 64; i++)
+      y += a[i];
+    #pragma omp masked taskloop simd collapse(2) reduction (+:z) default(none) firstprivate(a) private (i, j) filter (f)
+    for (j = 0; j < 1; j++)
+      for (i = 0; i < 64; ++i)
+	z += a[i];
+  }
+  #pragma omp parallel masked taskloop reduction (+:u) default(none) firstprivate(a, f) filter (f)
+  for (i = 0; i < 64; i++)
+    u += a[i];
+  #pragma omp parallel masked taskloop simd reduction (+:v) default(none) firstprivate(a, f) filter (f)
+  for (i = 0; i < 64; i++)
+    v += a[i];
+  #pragma omp parallel masked taskloop simd collapse(2) reduction (+:w) default(none) firstprivate(a, f) filter (f)
+  for (j = 0; j < 1; j++)
+    for (i = 0; i < 64; ++i)
+      w += a[i];
+}
diff --git a/gcc/testsuite/c-c++-common/gomp/masked-combined-2.c b/gcc/testsuite/c-c++-common/gomp/masked-combined-2.c
new file mode 100644
index 0000000..1d63969
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/gomp/masked-combined-2.c
@@ -0,0 +1,13 @@
+void
+foo (int *a)
+{
+  int i, r = 0, s = 0;
+  #pragma omp taskgroup task_reduction(+:r)
+  #pragma omp parallel masked taskloop in_reduction(+:r)	/* { dg-error "'in_reduction' is not valid for '#pragma omp parallel masked taskloop'" } */
+  for (i = 0; i < 64; i++)
+    r += a[i];
+  #pragma omp taskgroup task_reduction(+:s)
+  #pragma omp parallel masked taskloop simd in_reduction(+:s)	/* { dg-error "'in_reduction' is not valid for '#pragma omp parallel masked taskloop simd'" } */
+  for (i = 0; i < 64; i++)
+    s += a[i];
+}
diff --git a/gcc/testsuite/g++.dg/gomp/attrs-1.C b/gcc/testsuite/g++.dg/gomp/attrs-1.C
index 5c7007b..c348375 100644
--- a/gcc/testsuite/g++.dg/gomp/attrs-1.C
+++ b/gcc/testsuite/g++.dg/gomp/attrs-1.C
@@ -348,6 +348,10 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
     private (p) firstprivate (f) if (parallel: i2) default(shared) shared(s) reduction(+:r)
     num_threads (nth) proc_bind(spread) copyin(t) allocate (f))]]
     ;
+  [[omp::directive (parallel masked
+    private (p) firstprivate (f) if (parallel: i2) default(shared) shared(s) reduction(+:r)
+    num_threads (nth) proc_bind(spread) copyin(t) allocate (f) filter (d))]]
+    ;
   [[omp::directive (parallel
     private (p) firstprivate (f) if (parallel: i2) default(shared) shared(s) reduction(+:r)
     num_threads (nth) proc_bind(spread) copyin(t) allocate (f))]]
@@ -358,7 +362,15 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
     reduction(default, +:r) in_reduction(+:r2) allocate (f)))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::sequence (directive (taskgroup task_reduction (+:r2) allocate (r2)),
+    omp::directive (masked taskloop
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) final(fi) mergeable priority (pp)
+    reduction(default, +:r) in_reduction(+:r2) allocate (f) filter (d)))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (master)]];
+  [[omp::directive (masked)]];
+  [[omp::directive (masked filter (d))]];
   [[omp::sequence (omp::directive (taskgroup task_reduction (+:r2) allocate (r2)),
     directive (master taskloop simd
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) if(simd: i2) final(fi) mergeable priority (pp)
@@ -366,23 +378,47 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
     order(concurrent) allocate (f)))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::sequence (omp::directive (taskgroup task_reduction (+:r2) allocate (r2)),
+    directive (masked taskloop simd
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) if(simd: i2) final(fi) mergeable priority (pp)
+    safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) in_reduction(+:r2) nontemporal(ntm)
+    order(concurrent) allocate (f) filter (d)))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (parallel master taskloop
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) final(fi) mergeable priority (pp)
     reduction(default, +:r) if (parallel: i2) num_threads (nth) proc_bind(spread) copyin(t) allocate (f))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::directive (parallel masked taskloop
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) final(fi) mergeable priority (pp)
+    reduction(default, +:r) if (parallel: i2) num_threads (nth) proc_bind(spread) copyin(t) allocate (f) filter (d))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (parallel master taskloop simd
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) if(simd: i2) final(fi) mergeable priority (pp)
     safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) nontemporal(ntm) if (parallel: i2) num_threads (nth) proc_bind(spread) copyin(t)
     order(concurrent) allocate (f))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::directive (parallel masked taskloop simd
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) grainsize (g) collapse(1) untied if(taskloop: i1) if(simd: i2) final(fi) mergeable priority (pp)
+    safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) nontemporal(ntm) if (parallel: i2) num_threads (nth) proc_bind(spread) copyin(t)
+    order(concurrent) allocate (f) filter (d))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::sequence (directive (taskgroup task_reduction (+:r2) allocate (r2)),
     directive (master taskloop
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp)
     reduction(default, +:r) in_reduction(+:r2)))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::sequence (directive (taskgroup task_reduction (+:r2) allocate (r2)),
+    directive (masked taskloop
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp)
+    reduction(default, +:r) in_reduction(+:r2) filter (d)))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::sequence (omp::directive (taskgroup task_reduction (+:r2) allocate (r2)),
     omp::directive (master taskloop simd
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp)
@@ -390,17 +426,35 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
     order(concurrent) allocate (f)))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::sequence (omp::directive (taskgroup task_reduction (+:r2) allocate (r2)),
+    omp::directive (masked taskloop simd
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp)
+    safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) in_reduction(+:r2) nontemporal(ntm)
+    order(concurrent) allocate (f) filter (d)))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (parallel master taskloop
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp)
     reduction(default, +:r) num_threads (nth) proc_bind(spread) copyin(t) allocate (f))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::directive (parallel masked taskloop
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp)
+    reduction(default, +:r) num_threads (nth) proc_bind(spread) copyin(t) allocate (f) filter (d))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (parallel master taskloop simd
     private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp)
     safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) nontemporal(ntm) num_threads (nth) proc_bind(spread) copyin(t)
     order(concurrent) allocate (f))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::directive (parallel masked taskloop simd
+    private (p) firstprivate (f) lastprivate (l) shared (s) default(shared) num_tasks (nta) collapse(1) untied if(i1) final(fi) mergeable priority (pp)
+    safelen(8) simdlen(4) linear(ll: 1) aligned(q: 32) reduction(default, +:r) nontemporal(ntm) num_threads (nth) proc_bind(spread) copyin(t)
+    order(concurrent) allocate (f) filter (d))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (loop bind(thread) order(concurrent)
     private (p) lastprivate (l) collapse(1) reduction(+:r))]]
   for (l = 0; l < 64; ++l)
diff --git a/gcc/testsuite/g++.dg/gomp/attrs-2.C b/gcc/testsuite/g++.dg/gomp/attrs-2.C
index 1b59abd..b2fba21 100644
--- a/gcc/testsuite/g++.dg/gomp/attrs-2.C
+++ b/gcc/testsuite/g++.dg/gomp/attrs-2.C
@@ -348,6 +348,10 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
     private (p),firstprivate (f),if (parallel: i2),default(shared),shared(s),reduction(+:r),
     num_threads (nth),proc_bind(spread),copyin(t),allocate (f))]]
     ;
+  [[omp::directive (parallel masked,
+    private (p),firstprivate (f),if (parallel: i2),default(shared),shared(s),reduction(+:r),
+    num_threads (nth),proc_bind(spread),copyin(t),allocate (f),filter(d))]]
+    ;
   [[omp::directive (parallel,
     private (p),firstprivate (f),if (parallel: i2),default(shared),shared(s),reduction(+:r),
     num_threads (nth),proc_bind(spread),copyin(t),allocate (f))]]
@@ -358,7 +362,15 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
     reduction(default, +:r),in_reduction(+:r2),allocate (f)))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[using omp:sequence (directive (taskgroup, task_reduction (+:r2),allocate (r2)),
+    omp::directive (masked taskloop,
+    private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),grainsize (g),collapse(1),untied, if(taskloop: i1),final(fi),mergeable, priority (pp),
+    reduction(default, +:r),in_reduction(+:r2),allocate (f),filter(d)))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[using omp:directive (master)]];
+  [[using omp:directive (masked)]];
+  [[using omp:directive (masked,filter(d))]];
   [[omp::sequence (omp::directive (taskgroup task_reduction (+:r2),allocate (r2)),
     directive (master taskloop simd,
     private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),grainsize (g),collapse(1),untied,if(taskloop: i1),if(simd: i2),final(fi),mergeable,priority (pp),
@@ -366,23 +378,47 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
     order(concurrent),allocate (f)))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::sequence (omp::directive (taskgroup task_reduction (+:r2),allocate (r2)),
+    directive (masked taskloop simd,
+    private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),grainsize (g),collapse(1),untied,if(taskloop: i1),if(simd: i2),final(fi),mergeable,priority (pp),
+    safelen(8),simdlen(4),linear(ll: 1),aligned(q: 32),reduction(default, +:r),in_reduction(+:r2),nontemporal(ntm),
+    order(concurrent),allocate (f),filter(d)))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (parallel master taskloop,
     private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),grainsize (g),collapse(1),untied,if(taskloop: i1),final(fi),mergeable,priority (pp),
     reduction(default, +:r),if (parallel: i2),num_threads (nth),proc_bind(spread),copyin(t),allocate (f))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::directive (parallel masked taskloop,
+    private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),grainsize (g),collapse(1),untied,if(taskloop: i1),final(fi),mergeable,priority (pp),
+    reduction(default, +:r),if (parallel: i2),num_threads (nth),proc_bind(spread),copyin(t),allocate (f),filter(d))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (parallel master taskloop simd,
     private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),grainsize (g),collapse(1),untied,if(taskloop: i1),if(simd: i2),final(fi),mergeable,priority (pp),
     safelen(8),simdlen(4),linear(ll: 1),aligned(q: 32),reduction(default, +:r),nontemporal(ntm),if (parallel: i2),num_threads (nth),proc_bind(spread),copyin(t),
     order(concurrent),allocate (f))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::directive (parallel masked taskloop simd,
+    private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),grainsize (g),collapse(1),untied,if(taskloop: i1),if(simd: i2),final(fi),mergeable,priority (pp),
+    safelen(8),simdlen(4),linear(ll: 1),aligned(q: 32),reduction(default, +:r),nontemporal(ntm),if (parallel: i2),num_threads (nth),proc_bind(spread),copyin(t),
+    order(concurrent),allocate (f),filter(d))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::sequence (directive (taskgroup,task_reduction (+:r2),allocate (r2)),
     directive (master taskloop,
     private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),num_tasks (nta),collapse(1),untied,if(i1),final(fi),mergeable,priority (pp),
     reduction(default, +:r),in_reduction(+:r2)))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::sequence (directive (taskgroup,task_reduction (+:r2),allocate (r2)),
+    directive (masked taskloop,
+    private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),num_tasks (nta),collapse(1),untied,if(i1),final(fi),mergeable,priority (pp),
+    reduction(default, +:r),in_reduction(+:r2),filter(d)))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::sequence (omp::directive (taskgroup,task_reduction (+:r2),allocate (r2)),
     omp::directive (master taskloop simd,
     private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),num_tasks (nta),collapse(1),untied,if(i1),final(fi),mergeable,priority (pp),
@@ -390,17 +426,35 @@ bar (int d, int m, int i1, int i2, int i3, int p, int *idp, int s,
     order(concurrent),allocate (f)))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::sequence (omp::directive (taskgroup,task_reduction (+:r2),allocate (r2)),
+    omp::directive (masked taskloop simd,
+    private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),num_tasks (nta),collapse(1),untied,if(i1),final(fi),mergeable,priority (pp),
+    safelen(8),simdlen(4),linear(ll: 1),aligned(q: 32),reduction(default, +:r),in_reduction(+:r2),nontemporal(ntm),
+    order(concurrent),allocate (f),filter(d)))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (parallel master taskloop,
     private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),num_tasks (nta),collapse(1),untied if(i1),final(fi),mergeable priority (pp),
     reduction(default, +:r),num_threads (nth),proc_bind(spread),copyin(t),allocate (f))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::directive (parallel masked taskloop,
+    private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),num_tasks (nta),collapse(1),untied if(i1),final(fi),mergeable priority (pp),
+    reduction(default, +:r),num_threads (nth),proc_bind(spread),copyin(t),allocate (f),filter(d))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (parallel master taskloop simd,
     private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),num_tasks (nta),collapse(1),untied if(i1),final(fi),mergeable priority (pp),
     safelen(8),simdlen(4),linear(ll: 1),aligned(q: 32),reduction(default, +:r),nontemporal(ntm),num_threads (nth),proc_bind(spread),copyin(t),
     order(concurrent),allocate (f))]]
   for (int i = 0; i < 64; i++)
     ll++;
+  [[omp::directive (parallel masked taskloop simd,
+    private (p),firstprivate (f),lastprivate (l),shared (s),default(shared),num_tasks (nta),collapse(1),untied if(i1),final(fi),mergeable priority (pp),
+    safelen(8),simdlen(4),linear(ll: 1),aligned(q: 32),reduction(default, +:r),nontemporal(ntm),num_threads (nth),proc_bind(spread),copyin(t),
+    order(concurrent),allocate (f),filter(d))]]
+  for (int i = 0; i < 64; i++)
+    ll++;
   [[omp::directive (loop, bind(thread),order(concurrent),
     private (p),lastprivate (l),collapse(1),reduction(+:r))]]
   for (l = 0; l < 64; ++l)
diff --git a/gcc/testsuite/g++.dg/gomp/block-11.C b/gcc/testsuite/g++.dg/gomp/block-11.C
index c280006..cf4b0d3 100644
--- a/gcc/testsuite/g++.dg/gomp/block-11.C
+++ b/gcc/testsuite/g++.dg/gomp/block-11.C
@@ -1,3 +1,21 @@
+// { dg-do compile }
+
+void foo()
+{
+  #pragma omp masked
+    {
+      goto bad1;	// { dg-message "from here" }
+    }
+
+  #pragma omp masked filter(1)
+    {
+    bad1:		// { dg-error "jump" }
+			// { dg-message "exits OpenMP" "" { target *-*-* } .-1 }
+      return;		// { dg-error "invalid exit" }
+    }
+}
+
+// { dg-message "error: invalid branch to/from OpenMP structured block" "" { target *-*-* } 7 }
 /* PR c++/24516 */
 /* { dg-do compile } */
 
diff --git a/gcc/testsuite/g++.dg/gomp/tpl-masked-1.C b/gcc/testsuite/g++.dg/gomp/tpl-masked-1.C
new file mode 100644
index 0000000..8574861
--- /dev/null
+++ b/gcc/testsuite/g++.dg/gomp/tpl-masked-1.C
@@ -0,0 +1,21 @@
+// { dg-do compile }
+// { dg-options "-fopenmp -fdump-tree-gimple" }
+
+int i;
+
+template <typename T> void f1 (bool p, T t)
+{
+  if (p)
+    {
+      #pragma omp masked filter (t)
+	i++;
+    }
+}
+
+void f2 ()
+{
+  f1<int> (true, 0);
+  f1<long> (true, 0L);
+}
+
+// { dg-final { scan-tree-dump-times "#pragma omp masked" 2 "gimple" } }
diff --git a/gcc/testsuite/gcc.dg/gomp/nesting-1.c b/gcc/testsuite/gcc.dg/gomp/nesting-1.c
index 52fcda7..4a471c8 100644
--- a/gcc/testsuite/gcc.dg/gomp/nesting-1.c
+++ b/gcc/testsuite/gcc.dg/gomp/nesting-1.c
@@ -19,8 +19,10 @@ f1 (void)
       }
       #pragma omp single	/* { dg-error "may not be closely nested" } */
 	;
-    #pragma omp master		/* { dg-error "may not be closely nested" } */
-      ;
+      #pragma omp master	/* { dg-error "may not be closely nested" } */
+	;
+      #pragma omp masked	/* { dg-error "may not be closely nested" } */
+	;
       #pragma omp barrier	/* { dg-error "may not be closely nested" } */
     }
   #pragma omp sections
@@ -50,6 +52,11 @@ f1 (void)
   }
   #pragma omp sections
   {
+    #pragma omp masked		/* { dg-error "may not be closely nested" } */
+      ;
+  }
+  #pragma omp sections
+  {
     #pragma omp section
       ;
   }
@@ -81,6 +88,9 @@ f1 (void)
     #pragma omp section
     #pragma omp master		/* { dg-error "may not be closely nested" } */
       ;
+    #pragma omp section
+    #pragma omp masked		/* { dg-error "may not be closely nested" } */
+      ;
   }
   #pragma omp single
   {
@@ -97,6 +107,8 @@ f1 (void)
       ;
     #pragma omp master		/* { dg-error "may not be closely nested" } */
       ;
+    #pragma omp masked		/* { dg-error "may not be closely nested" } */
+      ;
     #pragma omp barrier		/* { dg-error "may not be closely nested" } */
   }
   #pragma omp master
@@ -116,6 +128,23 @@ f1 (void)
       ;
     #pragma omp barrier		/* { dg-error "may not be closely nested" } */
   }
+  #pragma omp masked filter (1)
+  {
+    #pragma omp for		/* { dg-error "may not be closely nested" } */
+    for (j = 0; j < 3; j++)
+      ;
+    #pragma omp sections	/* { dg-error "may not be closely nested" } */
+    {
+      ;
+    #pragma omp section
+      ;
+    }
+    #pragma omp single		/* { dg-error "may not be closely nested" } */
+      ;
+    #pragma omp master
+      ;
+    #pragma omp barrier		/* { dg-error "may not be closely nested" } */
+  }
   #pragma omp task
   {
     #pragma omp for		/* { dg-error "may not be closely nested" } */
@@ -131,6 +160,8 @@ f1 (void)
       ;
     #pragma omp master		/* { dg-error "may not be closely nested" } */
       ;
+    #pragma omp masked		/* { dg-error "may not be closely nested" } */
+      ;
     #pragma omp barrier		/* { dg-error "may not be closely nested" } */
   }
   #pragma omp parallel
@@ -148,6 +179,8 @@ f1 (void)
       ;
     #pragma omp master
       ;
+    #pragma omp masked
+      ;
     #pragma omp barrier
   }
 }
@@ -171,6 +204,8 @@ f2 (void)
       ;
     #pragma omp master
       ;
+    #pragma omp masked
+      ;
     #pragma omp barrier		/* { dg-error "may not be closely nested" } */
   }
 }
diff --git a/gcc/testsuite/gfortran.dg/goacc/host_data-tree.f95 b/gcc/testsuite/gfortran.dg/goacc/host_data-tree.f95
index 558e800..e575890 100644
--- a/gcc/testsuite/gfortran.dg/goacc/host_data-tree.f95
+++ b/gcc/testsuite/gfortran.dg/goacc/host_data-tree.f95
@@ -12,12 +12,12 @@ program test
   !$acc host_data use_device(p) if (p == 42)
   ! { dg-final { scan-tree-dump-times "(?n)D\\.\[0-9\]+ = \\*p == 42;$" 1 "original" } }
   ! { dg-final { scan-tree-dump-times "(?n)#pragma acc host_data use_device_ptr\\(p\\) if\\(D\\.\[0-9\]+\\)$" 1 "original" } }
-  ! { dg-final { scan-tree-dump-times "(?n)#pragma omp target oacc_host_data use_device_ptr\\(p\\) if\\(D\\.\[0-9\]+\\)$" 1 "gimple" } }
+  ! { dg-final { scan-tree-dump-times "(?n)#pragma omp target oacc_host_data use_device_ptr\\(p\\) if\\((?:D\\.|_)\[0-9\]+\\)$" 1 "gimple" } }
   !$acc end host_data
 
   !$acc host_data use_device(p) if_present if (p == 43)
   ! { dg-final { scan-tree-dump-times "(?n)D\\.\[0-9\]+ = \\*p == 43;$" 1 "original" } }
   ! { dg-final { scan-tree-dump-times "(?n)#pragma acc host_data use_device_ptr\\(p\\) if\\(D\\.\[0-9\]+\\) if_present$" 1 "original" } }
-  ! { dg-final { scan-tree-dump-times "(?n)#pragma omp target oacc_host_data use_device_ptr\\(if_present:p\\) if\\(D\\.\[0-9\]+\\) if_present$" 1 "gimple" } }
+  ! { dg-final { scan-tree-dump-times "(?n)#pragma omp target oacc_host_data use_device_ptr\\(if_present:p\\) if\\((?:D\\.|_)\[0-9\]+\\) if_present$" 1 "gimple" } }
   !$acc end host_data
 end program test
diff --git a/gcc/testsuite/gfortran.dg/goacc/kernels-tree.f95 b/gcc/testsuite/gfortran.dg/goacc/kernels-tree.f95
index 63ef7e1..688ed0a 100644
--- a/gcc/testsuite/gfortran.dg/goacc/kernels-tree.f95
+++ b/gcc/testsuite/gfortran.dg/goacc/kernels-tree.f95
@@ -37,5 +37,5 @@ end program test
 
 ! { dg-final { scan-tree-dump-times "map\\(force_deviceptr:u\\)" 1 "original" } } 
 
-! { dg-final { scan-tree-dump-times {(?n)#pragma omp target oacc_data_kernels if\(D\.[0-9]+\)$} 1 "omp_oacc_kernels_decompose" } }
-! { dg-final { scan-tree-dump-times {(?n)#pragma omp target oacc_parallel_kernels_gang_single num_gangs\(1\) if\(D\.[0-9]+\) async\(-1\)$} 1 "omp_oacc_kernels_decompose" } }
+! { dg-final { scan-tree-dump-times {(?n)#pragma omp target oacc_data_kernels if\((?:D\.|_)[0-9]+\)$} 1 "omp_oacc_kernels_decompose" } }
+! { dg-final { scan-tree-dump-times {(?n)#pragma omp target oacc_parallel_kernels_gang_single num_gangs\(1\) if\((?:D\.|_)[0-9]+\) async\(-1\)$} 1 "omp_oacc_kernels_decompose" } }
diff --git a/gcc/tree-core.h b/gcc/tree-core.h
index 9a1aa9a..9e901ce 100644
--- a/gcc/tree-core.h
+++ b/gcc/tree-core.h
@@ -476,6 +476,9 @@ enum omp_clause_code {
   /* OpenMP clause: bind (binding).  */
   OMP_CLAUSE_BIND,
 
+  /* OpenMP clause: filter (integer-expression).  */
+  OMP_CLAUSE_FILTER,
+
   /* Internally used only clause, holding SIMD uid.  */
   OMP_CLAUSE__SIMDUID_,
 
diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index 8e6cdd3..4ba48e0 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -1658,6 +1658,12 @@ remap_gimple_stmt (gimple *stmt, copy_body_data *id)
 	  copy = gimple_build_omp_master (s1);
 	  break;
 
+	case GIMPLE_OMP_MASKED:
+	  s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
+	  copy = gimple_build_omp_masked
+		   (s1, gimple_omp_masked_clauses (stmt));
+	  break;
+
 	case GIMPLE_OMP_TASKGROUP:
 	  s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
 	  copy = gimple_build_omp_taskgroup
@@ -4544,6 +4550,7 @@ estimate_num_insns (gimple *stmt, eni_weights *weights)
     case GIMPLE_OMP_TASK:
     case GIMPLE_OMP_CRITICAL:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_TASKGROUP:
     case GIMPLE_OMP_ORDERED:
     case GIMPLE_OMP_SCAN:
diff --git a/gcc/tree-nested.c b/gcc/tree-nested.c
index cc59526..d2b3969 100644
--- a/gcc/tree-nested.c
+++ b/gcc/tree-nested.c
@@ -1376,6 +1376,7 @@ convert_nonlocal_omp_clauses (tree *pclauses, struct walk_stmt_info *wi)
 	case OMP_CLAUSE_GRAINSIZE:
 	case OMP_CLAUSE_NUM_TASKS:
 	case OMP_CLAUSE_HINT:
+	case OMP_CLAUSE_FILTER:
 	case OMP_CLAUSE_NUM_GANGS:
 	case OMP_CLAUSE_NUM_WORKERS:
 	case OMP_CLAUSE_VECTOR_LENGTH:
@@ -1785,6 +1786,7 @@ convert_nonlocal_reference_stmt (gimple_stmt_iterator *gsi, bool *handled_ops_p,
 
     case GIMPLE_OMP_SECTION:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_ORDERED:
     case GIMPLE_OMP_SCAN:
       walk_body (convert_nonlocal_reference_stmt, convert_nonlocal_reference_op,
@@ -2154,6 +2156,7 @@ convert_local_omp_clauses (tree *pclauses, struct walk_stmt_info *wi)
 	case OMP_CLAUSE_GRAINSIZE:
 	case OMP_CLAUSE_NUM_TASKS:
 	case OMP_CLAUSE_HINT:
+	case OMP_CLAUSE_FILTER:
 	case OMP_CLAUSE_NUM_GANGS:
 	case OMP_CLAUSE_NUM_WORKERS:
 	case OMP_CLAUSE_VECTOR_LENGTH:
@@ -2518,6 +2521,7 @@ convert_local_reference_stmt (gimple_stmt_iterator *gsi, bool *handled_ops_p,
 
     case GIMPLE_OMP_SECTION:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_ORDERED:
     case GIMPLE_OMP_SCAN:
       walk_body (convert_local_reference_stmt, convert_local_reference_op,
@@ -3028,6 +3032,7 @@ convert_gimple_call (gimple_stmt_iterator *gsi, bool *handled_ops_p,
     case GIMPLE_OMP_SECTION:
     case GIMPLE_OMP_SINGLE:
     case GIMPLE_OMP_MASTER:
+    case GIMPLE_OMP_MASKED:
     case GIMPLE_OMP_TASKGROUP:
     case GIMPLE_OMP_ORDERED:
     case GIMPLE_OMP_SCAN:
diff --git a/gcc/tree-pretty-print.c b/gcc/tree-pretty-print.c
index 31f886f..5ac4034 100644
--- a/gcc/tree-pretty-print.c
+++ b/gcc/tree-pretty-print.c
@@ -1085,6 +1085,13 @@ dump_omp_clause (pretty_printer *pp, tree clause, int spc, dump_flags_t flags)
       pp_right_paren (pp);
       break;
 
+    case OMP_CLAUSE_FILTER:
+      pp_string (pp, "filter(");
+      dump_generic_node (pp, OMP_CLAUSE_FILTER_EXPR (clause),
+			 spc, flags, false);
+      pp_right_paren (pp);
+      break;
+
     case OMP_CLAUSE_DEFAULTMAP:
       pp_string (pp, "defaultmap(");
       switch (OMP_CLAUSE_DEFAULTMAP_BEHAVIOR (clause))
@@ -3586,6 +3593,11 @@ dump_generic_node (pretty_printer *pp, tree node, int spc, dump_flags_t flags,
       pp_string (pp, "#pragma omp master");
       goto dump_omp_body;
 
+    case OMP_MASKED:
+      pp_string (pp, "#pragma omp masked");
+      dump_omp_clauses (pp, OMP_MASKED_CLAUSES (node), spc, flags);
+      goto dump_omp_body;
+
     case OMP_TASKGROUP:
       pp_string (pp, "#pragma omp taskgroup");
       dump_omp_clauses (pp, OMP_TASKGROUP_CLAUSES (node), spc, flags);
diff --git a/gcc/tree.c b/gcc/tree.c
index e923e67..a0ff794 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -350,6 +350,7 @@ unsigned const char omp_clause_num_ops[] =
   0, /* OMP_CLAUSE_DEFAULTMAP  */
   0, /* OMP_CLAUSE_ORDER  */
   0, /* OMP_CLAUSE_BIND  */
+  1, /* OMP_CLAUSE_FILTER  */
   1, /* OMP_CLAUSE__SIMDUID_  */
   0, /* OMP_CLAUSE__SIMT_  */
   0, /* OMP_CLAUSE_INDEPENDENT  */
@@ -438,6 +439,7 @@ const char * const omp_clause_code_name[] =
   "defaultmap",
   "order",
   "bind",
+  "filter",
   "_simduid_",
   "_simt_",
   "independent",
@@ -11126,6 +11128,7 @@ walk_tree_1 (tree *tp, walk_tree_fn func, void *data,
 	case OMP_CLAUSE_GRAINSIZE:
 	case OMP_CLAUSE_NUM_TASKS:
 	case OMP_CLAUSE_HINT:
+	case OMP_CLAUSE_FILTER:
 	case OMP_CLAUSE_TO_DECLARE:
 	case OMP_CLAUSE_LINK:
 	case OMP_CLAUSE_DETACH:
diff --git a/gcc/tree.def b/gcc/tree.def
index eda050b..ff8b5e6 100644
--- a/gcc/tree.def
+++ b/gcc/tree.def
@@ -1218,6 +1218,11 @@ DEFTREECODE (OMP_SINGLE, "omp_single", tcc_statement, 2)
    Operand 1: OMP_SINGLE_CLAUSES: List of clauses.  */
 DEFTREECODE (OMP_TASKGROUP, "omp_taskgroup", tcc_statement, 2)
 
+/* OpenMP - #pragma omp masked
+   Operand 0: OMP_MASKED_BODY: Masked section body.
+   Operand 1: OMP_MASKED_CLAUSES: List of clauses.  */
+DEFTREECODE (OMP_MASKED, "omp_masked", tcc_statement, 2)
+
 /* OpenMP - #pragma omp scan
    Operand 0: OMP_SCAN_BODY: Scan body.
    Operand 1: OMP_SCAN_CLAUSES: List of clauses.  */
diff --git a/gcc/tree.h b/gcc/tree.h
index 972ceb3..c3f302a 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -1429,6 +1429,9 @@ class auto_suppress_location_wrappers
 
 #define OMP_MASTER_BODY(NODE)	   TREE_OPERAND (OMP_MASTER_CHECK (NODE), 0)
 
+#define OMP_MASKED_BODY(NODE)	   TREE_OPERAND (OMP_MASKED_CHECK (NODE), 0)
+#define OMP_MASKED_CLAUSES(NODE)   TREE_OPERAND (OMP_MASKED_CHECK (NODE), 1)
+
 #define OMP_TASKGROUP_BODY(NODE)   TREE_OPERAND (OMP_TASKGROUP_CHECK (NODE), 0)
 #define OMP_TASKGROUP_CLAUSES(NODE) \
   TREE_OPERAND (OMP_TASKGROUP_CHECK (NODE), 1)
@@ -1508,6 +1511,11 @@ class auto_suppress_location_wrappers
 #define OMP_MASTER_COMBINED(NODE) \
   (OMP_MASTER_CHECK (NODE)->base.private_flag)
 
+/* True on an OMP_MASKED statement if it represents an explicit
+   combined masked constructs.  */
+#define OMP_MASKED_COMBINED(NODE) \
+  (OMP_MASKED_CHECK (NODE)->base.private_flag)
+
 /* Memory order for OMP_ATOMIC*.  */
 #define OMP_ATOMIC_MEMORY_ORDER(NODE) \
   (TREE_RANGE_CHECK (NODE, OMP_ATOMIC, \
@@ -1592,6 +1600,8 @@ class auto_suppress_location_wrappers
   OMP_CLAUSE_OPERAND (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_NUM_TASKS), 0)
 #define OMP_CLAUSE_HINT_EXPR(NODE) \
   OMP_CLAUSE_OPERAND (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_HINT), 0)
+#define OMP_CLAUSE_FILTER_EXPR(NODE) \
+  OMP_CLAUSE_OPERAND (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_FILTER), 0)
 
 #define OMP_CLAUSE_GRAINSIZE_EXPR(NODE) \
   OMP_CLAUSE_OPERAND (OMP_CLAUSE_SUBCODE_CHECK (NODE, OMP_CLAUSE_GRAINSIZE),0)
diff --git a/libgomp/testsuite/libgomp.c-c++-common/masked-1.c b/libgomp/testsuite/libgomp.c-c++-common/masked-1.c
new file mode 100644
index 0000000..4ba259c
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c-c++-common/masked-1.c
@@ -0,0 +1,83 @@
+#include <omp.h>
+#include <stdlib.h>
+
+void
+foo (int x, int *a)
+{
+  #pragma omp masked
+  {
+    if (omp_get_thread_num () != 0)
+      abort ();
+    a[128]++;
+  }
+  #pragma omp masked filter (0)
+  {
+    if (omp_get_thread_num () != 0)
+      abort ();
+    a[129]++;
+  }
+  #pragma omp masked filter (7)
+  {
+    if (omp_get_thread_num () != 7)
+      abort ();
+    a[130]++;
+  }
+  #pragma omp masked filter (x)
+  {
+    if (omp_get_thread_num () != x)
+      abort ();
+    a[131]++;
+  }
+  #pragma omp masked taskloop simd filter (x) grainsize (12) simdlen (4)
+  for (int i = 0; i < 128; i++)
+    a[i] += i;
+}
+
+int
+main ()
+{
+  int a[136] = {};
+  #pragma omp parallel num_threads (4)
+  foo (4, a);
+  for (int i = 0; i < 128; i++)
+    if (a[i])
+      abort ();
+  if (a[128] != 1 || a[129] != 1 || a[130] || a[131])
+    abort ();
+  #pragma omp parallel num_threads (4)
+  foo (3, a);
+  for (int i = 0; i < 128; i++)
+    if (a[i] != i)
+      abort ();
+  if (a[128] != 2 || a[129] != 2 || a[130] || a[131] != 1)
+    abort ();
+  #pragma omp parallel num_threads (8)
+  foo (8, a);
+  for (int i = 0; i < 128; i++)
+    if (a[i] != i)
+      abort ();
+  if (a[128] != 3 || a[129] != 3 || a[130] != 1 || a[131] != 1)
+    abort ();
+  #pragma omp parallel num_threads (8)
+  foo (6, a);
+  for (int i = 0; i < 128; i++)
+    if (a[i] != 2 * i)
+      abort ();
+  if (a[128] != 4 || a[129] != 4 || a[130] != 2 || a[131] != 2)
+    abort ();
+  for (int i = 0; i < 8; i++)
+    a[i] = 0;
+  /* The filter expression can evaluate to different values in different threads.  */
+  #pragma omp parallel masked num_threads (8) filter (omp_get_thread_num () + 1)
+  a[omp_get_thread_num ()]++;
+  for (int i = 0; i < 8; i++)
+    if (a[i])
+      abort ();
+  /* And multiple threads can be filtered.  */
+  #pragma omp parallel masked num_threads (8) filter (omp_get_thread_num () & ~1)
+  a[omp_get_thread_num ()]++;
+  for (int i = 0; i < 8; i++)
+    if (a[i] != !(i & 1))
+      abort ();
+  return 0;
+}