1 files changed, 34 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/debug/vta-1.c b/gcc/testsuite/gcc.dg/debug/vta-1.c
new file mode 100644
index 000000000..414083a09
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/debug/vta-1.c
@@ -0,0 +1,34 @@
+/* https://bugzilla.redhat.com/show_bug.cgi?id=521991#c5
+
+   Distilled from Linux XFS source code.  foo, inlined into bar, ends
+   up with debug stmts referencing the addressable variable b.
+   Optimization made it non-addressable, and then completely optimized
+   away, before we got a chance to rename (and discard) the occurrence
+   in the debug stmt.  When we did, we crashed, attempting to rename
+   an unreference variable.  */
+
+/* { dg-do compile } */
+
+static inline int
+foo (void *x, unsigned y)
+{
+  unsigned z = *(unsigned long *) x % y;
+  *(unsigned long *) x = *(unsigned long *) x / y;
+  return z;
+}
+
+struct S
+{
+  unsigned t;
+};
+
+void
+bar (struct S *x, int *y)
+{
+  int a = 0;
+  unsigned long b = x->t;
+  foo (&b, x->t);
+  for (;; a++)
+    if (b)
+      *y = 1;
+}