1 files changed, 24 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/opt/loop1.C b/gcc/testsuite/g++.dg/opt/loop1.C
new file mode 100644
index 000000000..ad0308e7f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/opt/loop1.C
@@ -0,0 +1,24 @@
+// PR rtl-optimization/16590
+// { dg-do run }
+// { dg-options "-O2" }
+
+extern "C" void abort(); 
+ 
+struct iterator { 
+  char * p; 
+  int *dummy; 
+}; 
+ 
+static iterator pend(char * start) { 
+  iterator p = {start, 0}; 
+  if (p.p == start) p.p = start+5; 
+  --p.p; 
+  return p; 
+} 
+ 
+int main() { 
+  char mem[4+1]; 
+ 
+  if(pend(mem).p != mem+4) 
+    abort (); 
+}