------- Comment #12 from rguenth at gcc dot gnu dot org 2008-09-17 14:25
-------
Ok, so I think we should be fine if we ignore PHI nodes with zero-use results
during building the elimination graph - chained unused PHIs will have lifeness
computed for all but the PHI node with the zero-use result.
So, on the 4.3 branch the following fixes the failure for me:
Index: tree-outof-ssa.c
===================================================================
*** tree-outof-ssa.c (revision 140417)
--- tree-outof-ssa.c (working copy)
*************** eliminate_build (elim_graph g, basic_blo
*** 321,326 ****
--- 321,329 ----
for (phi = phi_nodes (B); phi; phi = PHI_CHAIN (phi))
{
+ if (has_zero_uses (PHI_RESULT (phi)))
+ continue;
+
T0 = var_to_partition_to_var (g->map, PHI_RESULT (phi));
/* Ignore results which are not in partitions. */
I am now giving this testing.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37102
