re PR middle-end/37285 (ICE while building binutils on ppc)

2008-10-01  Richard Guenther  <rguenther@suse.de>

        PR middle-end/37285
        * tree-vrp.c (execute_vrp): If we optimized away the default
        case make sure to promote the label that got in place of it
        to a default case label.

        * gcc.c-torture/compile/pr37285.c: New testcase.

From-SVN: r140814

gcc/ChangeLog

+2008-10-01  Richard Guenther  <rguenther@suse.de>
+
+        PR middle-end/37285
+        * tree-vrp.c (execute_vrp): If we optimized away the default
+        case make sure to promote the label that got in place of it
+        to a default case label.
+
 2008-10-01  Richard Henderson  <rth@redhat.com>
 
 	PR tree-opt/35737

gcc/testsuite/ChangeLog

+2008-10-01  Richard Guenther  <rguenther@suse.de>
+
+        PR middle-end/37285
+        * gcc.c-torture/compile/pr37285.c: New testcase.
+
 2008-10-01  Kai Tietz  <kai.tietz@onevision.com>
 
 	* g++.dg/abi/offsetof.C (main): Use __SIZE_TYPE__ instead of

gcc/testsuite/gcc.c-torture/compile/pr37285.c

+_bfd_xcoff_canonicalize_dynamic_reloc (unsigned long long l_symndx)
+{
+  if (l_symndx < 3)
+    {
+      switch (l_symndx)
+      {
+        case 0:
+        case 1:
+         break;
+        case 2:
+         _bfd_abort ("HI");
+    }
+  }
+}
+

gcc/tree-vrp.c

@@ -7149,9 +7149,16 @@ execute_vrp (void)
     {
       size_t j;
       size_t n = TREE_VEC_LENGTH (su->vec);
+      tree label;
       gimple_switch_set_num_labels (su->stmt, n);
       for (j = 0; j < n; j++)
 	gimple_switch_set_label (su->stmt, j, TREE_VEC_ELT (su->vec, j));
+      /* As we may have replaced the default label with a regular one
+	 make sure to make it a real default label again.  This ensures
+	 optimal expansion.  */
+      label = gimple_switch_default_label (su->stmt);
+      CASE_LOW (label) = NULL_TREE;
+      CASE_HIGH (label) = NULL_TREE;
     }
 
   if (VEC_length (edge, to_remove_edges) > 0)