1 files changed, 43 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/loop-versioning-8.c b/gcc/testsuite/gcc.dg/loop-versioning-8.c
new file mode 100644
index 00000000000..5645b13dc1a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/loop-versioning-8.c
@@ -0,0 +1,43 @@
+/* { dg-options "-O3 -fdump-tree-lversion-details" } */
+
+/* Versioning for step == 1 in these loops would allow loop interchange,
+   but otherwise isn't worthwhile.  At the moment we decide not to version.  */
+
+struct foo {
+  int a[100];
+};
+
+void
+f1 (struct foo *x, int step, int n)
+{
+  for (int i = 0; i < n; ++i)
+    for (int j = 0; j < n; ++j)
+      x[j * step].a[i] = 100;
+}
+
+void
+f2 (struct foo *x, int step, int n)
+{
+  for (int i = 0; i < n; ++i)
+    for (int j = 0; j < n; ++j)
+      x[j].a[i * step] = 100;
+}
+
+void
+f3 (struct foo *x, int step, int limit)
+{
+  for (int i = 0; i < 100; ++i)
+    for (int j = 0; j < limit; j += step)
+      x[j].a[i] = 100;
+}
+
+void
+f4 (struct foo *x, int step, int limit)
+{
+  for (int i = 0; i < limit; i += step)
+    for (int j = 0; j < 100; ++j)
+      x[j].a[i] = 100;
+}
+
+/* { dg-final { scan-tree-dump-not {want to version} "lversion" } } */
+/* { dg-final { scan-tree-dump-not {versioned} "lversion" } } */