===================================================================
@@ -864,6 +864,11 @@ base_object_writable (tree ref)
static bool
ifcvt_memrefs_wont_trap (gimple *stmt, vec<data_reference_p> drs)
{
+ /* If DR didn't see a reference here we can't use it to tell
+ whether the ref traps or not. */
+ if (gimple_uid (stmt) == 0)
+ return false;
+
data_reference_p *master_dr, *base_master_dr;
data_reference_p a = drs[gimple_uid (stmt) - 1];
===================================================================
@@ -0,0 +1,30 @@
+/* { dg-do compile } */
+
+long a;
+long *b;
+void c ();
+void d ();
+void
+e (long f)
+{
+ if (a)
+ *b = f;
+}
+void
+g ()
+{
+ c (g, e);
+}
+void
+c (int f, int h ())
+{
+ d (f, h, "");
+}
+void
+d (int f, int h (), char *i, char *k)
+{
+ int j;
+ d (f, h, i + 1, k);
+ while (--j)
+ h (*i);
+}