gimplify.c (gimplify_scan_omp_clauses): For inscan reductions on worksharing…

gimplify.c (gimplify_scan_omp_clauses): For inscan reductions on worksharing loop propagate it as shared clause to...

	* gimplify.c (gimplify_scan_omp_clauses): For inscan reductions
	on worksharing loop propagate it as shared clause to containing
	combined parallel.

	* c-omp.c (c_omp_split_clauses): Put OMP_CLAUSE_REDUCTION_INSCAN
	clauses on OMP_FOR rather than OMP_PARALLEL when OMP_FOR is combined
	with OMP_PARALLEL.

	* c-c++-common/gomp/scan-5.c: New test.

From-SVN: r272957

gcc/ChangeLog

 2019-07-03  Jakub Jelinek  <jakub@redhat.com>
 
+	* gimplify.c (gimplify_scan_omp_clauses): For inscan reductions
+	on worksharing loop propagate it as shared clause to containing
+	combined parallel.
+
 	* omp-expand.c (expand_omp_for_static_nochunk,
 	expand_omp_for_static_chunk): For nowait worksharing loop with
 	conditional lastprivate clause(s), emit GOMP_loop_end_nowait call

gcc/c-family/ChangeLog

+2019-07-03  Jakub Jelinek  <jakub@redhat.com>
+
+	* c-omp.c (c_omp_split_clauses): Put OMP_CLAUSE_REDUCTION_INSCAN
+	clauses on OMP_FOR rather than OMP_PARALLEL when OMP_FOR is combined
+	with OMP_PARALLEL.
+
 2019-07-02  qing zhao  <qing.zhao@oracle.com>
 
 	PR preprocessor/90581

gcc/c-family/c-omp.c

@@ -1634,7 +1634,8 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
 	  break;
 	/* Reduction is allowed on simd, for, parallel, sections, taskloop
 	   and teams.  Duplicate it on all of them, but omit on for or
-	   sections if parallel is present.  If taskloop is combined with
+	   sections if parallel is present (unless inscan, in that case
+	   omit on parallel).  If taskloop is combined with
 	   parallel, omit it on parallel.  */
 	case OMP_CLAUSE_REDUCTION:
 	  if (OMP_CLAUSE_REDUCTION_TASK (clauses))
@@ -1708,7 +1709,8 @@ c_omp_split_clauses (location_t loc, enum tree_code code,
 		  s = C_OMP_CLAUSE_SPLIT_PARALLEL;
 		}
 	      else if ((mask & (OMP_CLAUSE_MASK_1
-				<< PRAGMA_OMP_CLAUSE_NUM_THREADS)) != 0)
+				<< PRAGMA_OMP_CLAUSE_NUM_THREADS)) != 0
+		       && !OMP_CLAUSE_REDUCTION_INSCAN (clauses))
 		s = C_OMP_CLAUSE_SPLIT_PARALLEL;
 	      else
 		s = C_OMP_CLAUSE_SPLIT_FOR;

gcc/gimplify.c

@@ -9125,7 +9125,10 @@ gimplify_scan_omp_clauses (tree *list_p, gimple_seq *pre_p,
 			  " or private in outer context", DECL_NAME (decl));
 	    }
 	do_notice:
-	  if ((region_type & ORT_TASKLOOP) == ORT_TASKLOOP
+	  if (((region_type & ORT_TASKLOOP) == ORT_TASKLOOP
+	       || (region_type == ORT_WORKSHARE
+		   && OMP_CLAUSE_CODE (c) == OMP_CLAUSE_REDUCTION
+		   && OMP_CLAUSE_REDUCTION_INSCAN (c)))
 	      && outer_ctx
 	      && outer_ctx->region_type == ORT_COMBINED_PARALLEL
 	      && (OMP_CLAUSE_CODE (c) == OMP_CLAUSE_REDUCTION

gcc/testsuite/ChangeLog

 2019-07-03  Jakub Jelinek  <jakub@redhat.com>
 
+	* c-c++-common/gomp/scan-5.c: New test.
+
 	* c-c++-common/gomp/lastprivate-conditional-5.c: New test.
 
 2019-07-02  Jeff Law  <law@redhat.com>

gcc/testsuite/c-c++-common/gomp/scan-5.c

+int
+foo (int *a, int *b)
+{
+  int r = 0;
+  #pragma omp parallel for reduction (inscan, +:r) default(none) firstprivate (a, b)
+  for (int i = 0; i < 64; i++)
+    {
+      r += a[i];
+      #pragma omp scan inclusive (r)	/* { dg-message "sorry, unimplemented: '#pragma omp scan' not supported yet" } */
+      b[i] = r;
+    }
+  return r;
+}