1 files changed, 47 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/predcom-2.c b/gcc/testsuite/gcc.dg/tree-ssa/predcom-2.c
new file mode 100644
index 000000000..7275f2868
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/predcom-2.c
@@ -0,0 +1,47 @@
+/* { dg-do compile } */
+/* { dg-do run } */
+/* { dg-options "-O2 -fpredictive-commoning -fdump-tree-pcom-details" } */
+
+void abort (void);
+
+long int fib[1000];
+
+__attribute__ ((noinline))
+void count_fib(void)
+{
+  int i;
+
+  fib[0] = 0;
+  fib[1] = 1;
+  for (i = 2; i < 1000; i++)
+    fib[i] = (fib[i-1] + fib[i - 2]) & 0xffff;
+}
+
+int avg[1000];
+
+__attribute__ ((noinline))
+void count_averages(void)
+{
+  int i;
+
+  for (i = 1; i < 999; i++)
+    avg[i] = ((fib[i - 1] + fib[i] + fib[i + 1]) / 3) & 0xffff;
+}
+
+int main(void)
+{
+  count_fib ();
+  count_averages ();
+
+  if (fib[19] != 4181 || avg[19] != 4510)
+    abort ();
+
+  if (fib[999] != 162 || avg[998] != 21953)
+    abort ();
+
+  return 0;
+}
+
+/* Verify that both loops were transformed and unrolled.  */
+/* { dg-final { scan-tree-dump-times "Unrolling 2 times." 2 "pcom"} } */
+/* { dg-final { cleanup-tree-dump "pcom" } } */