[Bug middle-end/38474] slow compilation at -O0 due to expand's temp slot goo

[Joost.VandeVondele at mat dot ethz.ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38474

--- Comment #71 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> 2012-08-28 14:54:54 UTC ---
The -O3 compile is 3h later still running and needs >20Gb of RAM. The issue
seems now to be variable_tracking_main

#0  0x0000000000b7b8ce in dataflow_set_preserve_mem_locs(void**, void*) ()
#1  0x0000000000e76168 in htab_traverse_noresize ()
#2  0x0000000000b770e0 in dataflow_set_clear_at_call(dataflow_set_def*) ()
#3  0x0000000000b7c613 in vt_emit_notes() ()
#4  0x0000000000b847ea in variable_tracking_main() ()
#5  0x00000000008e8acf in execute_one_pass(opt_pass*) ()