[Bug middle-end/56113] out of memory when compiling a function with many goto labels (50k > )

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56113

--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> 2013-01-30 14:38:29 UTC ---
The following (old!?) idea helps though:

Index: gcc/tree-ssa-loop-manip.c
===================================================================
--- gcc/tree-ssa-loop-manip.c   (revision 195574)
+++ gcc/tree-ssa-loop-manip.c   (working copy)
@@ -536,7 +536,7 @@ rewrite_into_loop_closed_ssa (bitmap cha

   /* Fix up all the names found to be used outside their original
      loops.  */
-  update_ssa (TODO_update_ssa);
+  update_ssa (TODO_update_ssa_no_phi);
 }

 /* Check invariants of the loop closed ssa form for the USE in BB.  */

why would adding a copy on an edge (thus a new def) require us to insert
new PHI nodes?  With that patch:

 tree SSA incremental    :   0.06 ( 0%) usr
 TOTAL                 :  46.36

Of course I must not remember sth here ...