1 files changed, 30 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/predcom-4.c b/gcc/testsuite/gcc.dg/tree-ssa/predcom-4.c
new file mode 100644
index 000000000..6f06b7f8b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/predcom-4.c
@@ -0,0 +1,30 @@
+/* { dg-do compile } */
+/* { dg-do run } */
+/* { dg-options "-O2 -fpredictive-commoning -fdump-tree-pcom-details" } */
+
+/* Test for predictive commoning of expressions, without reassociation.  */
+
+void abort (void);
+
+int a[1000], b[1000], c[1000];
+
+int main(void)
+{
+  int i;
+
+  for (i = 0; i < 1000; i++)
+    a[i] = b[i] = i;
+
+  for (i = 1; i < 998; i++)
+    c[i] = a[i + 2] * b[i + 1] - b[i - 1] * a[i];
+
+  for (i = 1; i < 998; i++)
+    if (c[i] != 4 * i + 2)
+      abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "Combination" 1 "pcom"} } */
+/* { dg-final { scan-tree-dump-times "Unrolling 3 times." 1 "pcom"} } */
+/* { dg-final { cleanup-tree-dump "pcom" } } */