[Bug rtl-optimization/50764] [4.7 Regression] ICE: in maybe_record_trace_start, at dwarf2cfi.c:2243 with -O2 -fsched2-use-superblocks -ftree-tail-merge

[vries at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50764

vries at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|tree-optimization           |rtl-optimization

--- Comment #7 from vries at gcc dot gnu.org 2011-10-29 12:28:23 UTC ---
Using this patch, the dead label introduced by cfg_layout_finalize is removed:
...
Index: gcc/bb-reorder.c
===================================================================
--- gcc/bb-reorder.c (revision 180521)
+++ gcc/bb-reorder.c (working copy)
@@ -2328,6 +2328,7 @@ rest_of_handle_reorder_blocks (void)
     if (bb->next_bb != EXIT_BLOCK_PTR)
       bb->aux = bb->next_bb;
   cfg_layout_finalize ();
+  cleanup_cfg (0);

   /* Add NOTE_INSN_SWITCH_TEXT_SECTIONS notes.  */
   insert_section_boundary_note ();
...
and the assert triggers for -O2 -fsched2-use-superblocks -fno-tree-tail-merge.
Changing component to rtl-optimization.