[Bug tree-optimization/39204] [4.4 Regression] ICE in compute_attic

[rguenth at gcc dot gnu dot org]

------- Comment #9 from rguenth at gcc dot gnu dot org  2009-02-17 13:23 -------
This happens to fix it:

Index: tree-ssa-pre.c
===================================================================
--- tree-ssa-pre.c      (revision 144226)
+++ tree-ssa-pre.c      (working copy)
@@ -3537,7 +3537,10 @@ make_values_for_phi (gimple phi, basic_b
      actual computations.  */
   if (is_gimple_reg (result))
     {
-      pre_expr e = get_or_alloc_expr_for_name (result);
+      pre_expr e;
+      if (VN_INFO (result)->valnum != VN_TOP)
+       result = VN_INFO (result)->valnum;
+      e = get_or_alloc_expr_for_name (result);
       add_to_value (get_expr_value_id (e), e);
       bitmap_insert_into_set (PHI_GEN (block), e);
       bitmap_value_insert_into_set (AVAIL_OUT (block), e);

Jakub, can you verify this also fixes the original testcase?  Danny, does the
above make sense at all?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39204