[gomp4.1] Add taskloop-4.c testcase

[Jakub Jelinek <jakub at redhat dot com>]

Hi!

I've committed another testcase, which tests the computation of
number of iterations for each task and number of tasks.

2015-05-21  Jakub Jelinek  <jakub@redhat.com>

	* testsuite/libgomp.c/taskloop-4.c: New test.

--- libgomp/testsuite/libgomp.c/taskloop-4.c	(revision 0)
+++ libgomp/testsuite/libgomp.c/taskloop-4.c	(working copy)
@@ -0,0 +1,97 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -fopenmp" } */
+
+int u[64], v;
+
+__attribute__((noinline, noclone)) int
+test (int a, int b, int c, int d, void (*fn) (int, int, int, int),
+      int *num_tasks, int *min_iters, int *max_iters)
+{
+  int i, t = 0;
+  __builtin_memset (u, 0, sizeof u);
+  v = 0;
+  fn (a, b, c, d);
+  *min_iters = 0;
+  *max_iters = 0;
+  *num_tasks = v;
+  if (v)
+    {
+      *min_iters = u[0];
+      *max_iters = u[0];
+      t = u[0];
+      for (i = 1; i < v; i++)
+	{
+	  if (*min_iters > u[i])
+	    *min_iters = u[i];
+	  if (*max_iters < u[i])
+	    *max_iters = u[i];
+	  t += u[i];
+	}
+    }
+  return t;
+}
+
+void
+grainsize (int a, int b, int c, int d)
+{
+  int i, j = 0, k = 0;
+  #pragma omp taskloop firstprivate (j, k) grainsize(d)
+  for (i = a; i < b; i += c)
+    {
+      if (j == 0)
+	{
+	  #pragma omp atomic capture
+	    k = v++;
+	  if (k >= 64)
+	    __builtin_abort ();
+	}
+      u[k] = ++j;
+    }
+}
+
+void
+num_tasks (int a, int b, int c, int d)
+{
+  int i, j = 0, k = 0;
+  #pragma omp taskloop firstprivate (j, k) num_tasks(d)
+  for (i = a; i < b; i += c)
+    {
+      if (j == 0)
+	{
+	  #pragma omp atomic capture
+	    k = v++;
+	  if (k >= 64)
+	    __builtin_abort ();
+	}
+      u[k] = ++j;
+    }
+}
+
+int
+main ()
+{
+  #pragma omp parallel
+    #pragma omp single
+      {
+	int min_iters, max_iters, ntasks;
+	/* If grainsize is present, # of task loop iters is >= grainsize && < 2 * grainsize,
+	   unless # of loop iterations is smaller than grainsize.  */
+	if (test (0, 79, 1, 17, grainsize, &ntasks, &min_iters, &max_iters) != 79
+	    || min_iters < 17 || max_iters >= 17 * 2)
+	  __builtin_abort ();
+	if (test (-49, 2541, 7, 28, grainsize, &ntasks, &min_iters, &max_iters) != 370
+	    || min_iters < 28 || max_iters >= 28 * 2)
+	  __builtin_abort ();
+	if (test (7, 21, 2, 15, grainsize, &ntasks, &min_iters, &max_iters) != 7
+	    || ntasks != 1 || min_iters != 7 || max_iters != 7)
+	  __builtin_abort ();
+	/* If num_tasks is present, # of task loop iters is min (# of loop iters, num_tasks).  */
+	if (test (-51, 2500, 48, 9, num_tasks, &ntasks, &min_iters, &max_iters) != 54
+	    || ntasks != 9)
+	  __builtin_abort ();
+	if (test (0, 25, 2, 17, num_tasks, &ntasks, &min_iters, &max_iters) != 13
+	    || ntasks != 13)
+	  __builtin_abort ();
+      }
+  return 0;
+}

	Jakub