[Bug tree-optimization/41497] [4.5 Regression] apparent integer wrong code bug

["ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from ebotcazou at gcc dot gnu dot org  2009-10-12 17:59 -------
> It is caused by revision 147716:
> 
> http://gcc.gnu.org/ml/gcc-cvs/2009-05/msg00693.html

Yep, but it's Richard's fault. ;-)  The bug is exposed by the change requested
in http://gcc.gnu.org/ml/gcc-patches/2009-05/msg01227.html so I won't go beyond
suggesting the following partial reversion

Index: tree-scalar-evolution.c
===================================================================
--- tree-scalar-evolution.c     (revision 152647)
+++ tree-scalar-evolution.c     (working copy)
@@ -1159,7 +1159,7 @@ follow_ssa_edge_expr (struct loop *loop,

   switch (code)
     {
-    CASE_CONVERT:
+    case NOP_EXPR:
       /* This assignment is under the form "a_1 = (cast) rhs.  */
       res = follow_ssa_edge_expr (loop, at_stmt, TREE_OPERAND (expr, 0),
                                  halting_phi, evolution_of_loop, limit);
@@ -1222,7 +1222,7 @@ follow_ssa_edge_in_rhs (struct loop *loo

   switch (code)
     {
-    CASE_CONVERT:
+    case NOP_EXPR:
       /* This assignment is under the form "a_1 = (cast) rhs.  */
       res = follow_ssa_edge_expr (loop, stmt, gimple_assign_rhs1 (stmt),
                                  halting_phi, evolution_of_loop, limit);

But I also think that the real problem is elsewhere.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41497