[Bug middle-end/42509] [4.5 Regression] bootstrap failure in stage3 (integer overflow in preprocessor expression)

["ramana at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #18 from ramana at gcc dot gnu dot org  2010-04-02 00:01 -------

A work around I tried was to make cross-jumping run dependent on CSA which is
probably a heavy weight work around to what looks like a different problem. It
ended up retaining the correct ALIAS fields in this case but that's a heavy
weight solution and will in most likely hood make this bug go latent again. 

I'm travelling the next few days with minimal network access and given this
needs a MI expert to look at this - so can't actively work on this till I get
back next Tuesday . Hence un-assigning myself from it. 


Index: combine-stack-adj.c
===================================================================
--- combine-stack-adj.c (revision 157912)
+++ combine-stack-adj.c (working copy)
@@ -552,7 +552,6 @@ gate_handle_stack_adjustments (void)
 static unsigned int
 rest_of_handle_stack_adjustments (void)
 {
-  cleanup_cfg (flag_crossjumping ? CLEANUP_CROSSJUMP : 0);

   /* This is kind of a heuristic.  We need to run combine_stack_adjustments
      even for machines with possibly nonzero RETURN_POPS_ARGS
@@ -562,6 +561,7 @@ rest_of_handle_stack_adjustments (void)
   if (!ACCUMULATE_OUTGOING_ARGS)
 #endif
     {
+      cleanup_cfg (flag_crossjumping ? CLEANUP_CROSSJUMP : 0);
       df_note_add_problem ();
       df_analyze ();
       combine_stack_adjustments ();


-- 

ramana at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|ramana at gcc dot gnu dot   |unassigned at gcc dot gnu
                   |org                         |dot org
             Status|ASSIGNED                    |NEW


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42509