[Bug rtl-optimization/54993] [4.8 regression] PIC register not marked as live

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54993



--- Comment #1 from Steven Bosscher <steven at gcc dot gnu.org> 2012-10-28 
12:33:50 UTC ---

I cannot reproduce this problem, neither before nor after r192890. Can you

please attach the .ira dump (with -fdump-rtl-ira-all) after r192890, with and

without the following patch applied?



Index: ira.c

===================================================================

--- ira.c       (revision 192893)

+++ ira.c       (working copy)

@@ -4405,9 +4405,11 @@

      interpretation of the DF_LR problem.  See PR38711.

      Remove the problem, so that we don't spend time updating it in

      any of the df_analyze() calls during IRA/LRA.  */

+#if 0

   if (optimize > 1)

     df_remove_problem (df_live);

   gcc_checking_assert (df_live == NULL);

+#endif



 #ifdef ENABLE_CHECKING

   df->changeable_flags |= DF_VERIFY_SCHEDULED;