--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ldist-33.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-loop-distribution -ftree-loop-distribute-patterns -fdump-tree-ldist-details" } */
+
+#define N (1024)
+double a[N][N], b[N][N], c[N][N];
+
+void
+foo (void)
+{
+  unsigned i, j, k;
+
+  for (i = 0; i < N; ++i)
+    for (j = 0; j < N; ++j)
+      {
+	c[i][j] = 0.0;
+	for (k = 0; k < N; ++k)
+	  c[i][j] += a[i][k] * b[k][j];
+      }
+}
+
+/* { dg-final { scan-tree-dump "Loop nest . distributed: split to 1 loops and 1 library" "ldist" } } */