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 ...
