Add gcc.dg/parloops-exit-first-loop-alt-4.c

2015-06-13  Tom de Vries  <tom@codesourcery.com>

	* gcc.dg/parloops-exit-first-loop-alt-4.c: New test.

	* testsuite/libgomp.c/parloops-exit-first-loop-alt-4.c: New test.

From-SVN: r224453

gcc/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2015-06-13  Tom de Vries  <tom@codesourcery.com>
+
+	* gcc.dg/parloops-exit-first-loop-alt-4.c: New test.
+
 2015-06-13  Tom de Vries  <tom@codesourcery.com>
 
 	* gcc.dg/parloops-exit-first-loop-alt-2.c: Add comment.

gcc/testsuite/gcc.dg/parloops-exit-first-loop-alt-4.c

@@ -0,0 +1,28 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target pthread } */
+/* { dg-options "-O2 -ftree-parallelize-loops=2 -fdump-tree-parloops" } */
+
+/* Constant bound, reduction.  */
+
+#define N 4000
+
+unsigned int *a;
+
+unsigned int
+f (void)
+{
+  int i;
+  unsigned int sum = 1;
+
+  for (i = 0; i < N; ++i)
+    sum += a[i];
+
+  return sum;
+}
+
+/* Three array accesses:
+   - one in f._loopfn.0
+   - one in the parallel
+   - one in the low iteration count loop
+   Crucially, none for a peeled off last iteration following the parallel.  */
+/* { dg-final { scan-tree-dump-times "(?n)\\\* 4" 3 "parloops" } } */

libgomp/ChangeLog

@@ -1,3 +1,7 @@
+2015-06-13  Tom de Vries  <tom@codesourcery.com>
+
+	* testsuite/libgomp.c/parloops-exit-first-loop-alt-4.c: New test.
+
 2015-06-13  Tom de Vries  <tom@codesourcery.com>
 
 	* testsuite/libgomp.c/parloops-exit-first-loop-alt-2.c: Add comment.

libgomp/testsuite/libgomp.c/parloops-exit-first-loop-alt-4.c

@@ -0,0 +1,33 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -ftree-parallelize-loops=2" } */
+
+/* Constant bound, reduction.  */
+
+#define N 4000
+
+unsigned int *a;
+
+unsigned int
+f (void)
+{
+  int i;
+  unsigned int sum = 1;
+
+  for (i = 0; i < N; ++i)
+    sum += a[i];
+
+  return sum;
+}
+
+int
+main (void)
+{
+  unsigned int res;
+  unsigned int array[N];
+  int i;
+  for (i = 0; i < N; ++i)
+    array[i] = i % 7;
+  a = &array[0];
+  res = f ();
+  return !(res == 11995);
+}