[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 #70 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> 2012-08-28 11:28:06 UTC ---
(In reply to comment #69)
> Is there still a problem here?

for current trunk and the original testcase, timings are reasonable at -O0 -O1
-O2, but very long at -O3 (>60min):

report.O0.txt: TOTAL                 :  38.78             0.89            39.67
            691166 kB
report.O1.txt: TOTAL                 :  70.04             1.13            71.22
            634523 kB
report.O2.txt: TOTAL                 : 204.51             1.16           205.71
            691522 kB

the biggest consumers are

-O0:  
====
integrated RA           :  10.36 
reload                  :   5.16;

-O1:
====
tree PTA                :   7.77
integrated RA           :  13.36

-O2:
====
expand vars             :  83.15
tree PTA                :  35.04

-O3: (also needs about 4Gb of memory)
====
??? not yet finished (>60min)