1 files changed, 54 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/20020310-1.c b/gcc/testsuite/gcc.dg/20020310-1.c
new file mode 100644
index 000000000..bdd29672b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/20020310-1.c
@@ -0,0 +1,54 @@
+/* PR optimization/5844
+   This testcase was miscompiled because of an rtx sharing bug.  */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+/* { dg-options "-O2 -mtune=i586" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
+
+struct A
+{
+  struct A *a;
+  int b;
+};
+
+struct B
+{
+  struct A *c;
+  unsigned int d;
+};
+
+struct A p = { &p, -1 };
+struct B q = { &p, 0 };
+
+extern void abort (void);
+extern void exit (int);
+
+struct B *
+foo (void)
+{
+  return &q;
+}
+
+void
+bar (void)
+{
+  struct B *e = foo ();
+  struct A *f = e->c;
+  int g = f->b;
+
+  if (++g == 0)
+    {
+      e->d++;
+      e->c = f->a;
+    }
+
+  f->b = g;
+}
+
+int
+main ()
+{
+  bar ();
+  if (p.b != 0 || q.d != 1 || q.c != &p)
+    abort ();
+  exit (0);
+}