1 files changed, 63 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/predcom-dse-7.c b/gcc/testsuite/gcc.dg/tree-ssa/predcom-dse-7.c
new file mode 100644
index 00000000000..0bde6e6dced
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/predcom-dse-7.c
@@ -0,0 +1,63 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -fno-inline -fpredictive-commoning -fdump-tree-pcom-details" } */
+
+int arr[105] = {2, 3, 5, 7, 11, 13, 17, 19};
+int result0[10] = {2, 3, 5, 7, 11, 13, 17, 19};
+int result1[10] = {0, -1, 5, -3, 11, -5, 17, 19};
+int result2[10] = {0, 0, -1, -3, -3, -5, -5, 19};
+int result3[10] = {0, 0, 0, -1, -3, -3, -5, -5};
+int result4[10] = {0, 0, 0, 0, -1, -3, -3, -5, -5};
+int result100[105] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -3, -3, -5, -5};
+
+extern void abort (void);
+
+void __attribute__((noinline)) foo (int *a, int len)
+{
+  int i;
+  for (i = 0; i < len; i++)
+    {
+      a[i] = 0;
+      a[i + 1] = -1;
+      a[i + 3] = -3;
+      a[i + 5] = -5;
+    }
+}
+
+void check (int *a, int *res, int len)
+{
+  int i;
+
+  for (i = 0; i < len; i++)
+    if (a[i] != res[i])
+      abort ();
+}
+
+int main (void)
+{
+  foo (arr, 0);
+  check (arr, result0, 10);
+
+  foo (arr, 1);
+  check (arr, result1, 10);
+
+  foo (arr, 2);
+  check (arr, result2, 10);
+
+  foo (arr, 3);
+  check (arr, result3, 10);
+
+  foo (arr, 4);
+  check (arr, result4, 10);
+
+  foo (arr, 100);
+  check (arr, result100, 105);
+
+  return 0;
+}
+/* { dg-final { scan-tree-dump "Store-stores chain" "pcom"} } */