[Bug middle-end/39326] Segmentation fault with -O1, out of memory with -O2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39326

--- Comment #55 from Richard Biener <rguenth at gcc dot gnu.org> ---
Current GCC 6 numbers:

-O1 -g

 var-tracking dataflow   :  89.37 (60%) usr   0.09 (23%) sys  89.53 (59%) wall 
 11542 kB ( 3%) ggc
 var-tracking emit       :  47.70 (32%) usr   0.05 (13%) sys  47.81 (32%) wall 
  4546 kB ( 1%) ggc
 TOTAL                 : 150.06             0.39           150.60            
441618 kB

and 580MB peak memory use

-O2

 PRE                     :  11.41 (40%) usr   0.01 ( 3%) sys  11.43 (39%) wall 
   921 kB ( 0%) ggc
 integrated RA           :   4.78 (17%) usr   0.09 (26%) sys   4.86 (17%) wall 
 14129 kB ( 4%) ggc
 TOTAL                 :  28.84             0.34            29.21            
375189 kB

and 820MB peak memory use

-O3

 load CSE after reload   :  30.42 (49%) usr   0.02 ( 6%) sys  30.46 (49%) wall 
     0 kB ( 0%) ggc
 TOTAL                 :  62.08             0.32            62.47            
415741 kB

and 700MB peak memory use