1 files changed, 30 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-5.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-5.c
new file mode 100644
index 000000000..a8db74afe
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-5.c
@@ -0,0 +1,30 @@
+/* A test for induction variable merging.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-tree-optimized" } */
+
+void foo(long);
+
+void xxx(void)
+{
+  long iter, jter;
+
+  for (iter = 0, jter = 2; iter < 100; iter++, jter++)
+    {
+      foo (iter);
+      foo (jter);
+    }
+}
+
+/* Only iter variable should remain.  */
+
+/* { dg-final { scan-tree-dump-times "int iter" 1 "optimized" } } */
+
+/* And jter shouldn't be an induction variable anymore (no PHI node).  */
+/* { dg-final { scan-tree-dump-times "jter_\[0-9\]* = PHI" 0 "optimized" } } */
+
+/* And the use of jter should be replaced by iter + 2 */
+
+/* { dg-final { scan-tree-dump-times " \\+ 2" 1 "optimized" } } */
+
+/* { dg-final { cleanup-tree-dump "optimized" } } */