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[Bug middle-end/28071] [4.1 regression] A file that can not be compiled in reasonable time/space



------- Comment #61 from hubicka at gcc dot gnu dot org  2007-02-06 22:14 -------
Also forgot to mention, integration is slow because of the split_block
quadraticness.

For -O2:
We need 531MB of ram, GGC memory is peaking at 100MB, large portion of the
non-GGC memory are definitly the scheduler dependency lists.

xecution times (seconds)
 garbage collection    :  14.26 ( 5%) usr   0.03 ( 1%) sys  14.27 ( 5%) wall   
   0 kB ( 0%) ggc
 life analysis         :  73.96 (24%) usr   1.55 (46%) sys  75.52 (24%) wall   
7207 kB ( 2%) ggc
 alias analysis        :   0.92 ( 0%) usr   0.00 ( 0%) sys   0.87 ( 0%) wall   
8530 kB ( 3%) ggc
 inline heuristics     :  11.64 ( 4%) usr   0.12 ( 4%) sys  11.77 ( 4%) wall   
2695 kB ( 1%) ggc
 integration           :  16.71 ( 5%) usr   0.19 ( 6%) sys  16.91 ( 5%) wall  
69808 kB (21%) ggc
 tree gimplify         :   0.49 ( 0%) usr   0.07 ( 2%) sys   0.58 ( 0%) wall  
14977 kB ( 4%) ggc
 tree operand scan     :   1.25 ( 0%) usr   0.11 ( 3%) sys   1.29 ( 0%) wall  
20889 kB ( 6%) ggc
 tree SRA              :   1.20 ( 0%) usr   0.07 ( 2%) sys   1.37 ( 0%) wall  
40364 kB (12%) ggc
 tree FRE              :   1.14 ( 0%) usr   0.07 ( 2%) sys   1.21 ( 0%) wall   
9230 kB ( 3%) ggc
 expand                :   3.29 ( 1%) usr   0.10 ( 3%) sys   3.39 ( 1%) wall  
45828 kB (14%) ggc
 PRE                   :  21.54 ( 7%) usr   0.00 ( 0%) sys  21.54 ( 7%) wall   
 898 kB ( 0%) ggc
 regmove               :  93.59 (30%) usr   0.05 ( 1%) sys  93.64 (30%) wall   
 156 kB ( 0%) ggc
 local alloc           :   5.34 ( 2%) usr   0.00 ( 0%) sys   5.33 ( 2%) wall   
2838 kB ( 1%) ggc
 global alloc          :   4.25 ( 1%) usr   0.06 ( 2%) sys   4.30 ( 1%) wall  
19946 kB ( 6%) ggc
 reload CSE regs       :   4.09 ( 1%) usr   0.00 ( 0%) sys   4.11 ( 1%) wall  
11354 kB ( 3%) ggc
 scheduling 2          :  16.97 ( 6%) usr   0.44 (13%) sys  17.53 ( 6%) wall  
20069 kB ( 6%) ggc
 TOTAL                 : 308.36             3.39           312.58            
334207 kB
total: 531915 kB

regmove has the quadratic loop issues I added param for earliler in the track,
but the parameter is now apparently bit too large since rest of compiler is a
lot faster.  Scheduler/out-of-SSA slowness is gone.

There are no overly large bitmaps, one large allocpool:
df_scan_ref pool          18   74449440   67061984          0

Looks like we are in pretty good shape on this one, only IMO important problems
being the slowness of life (hopefully fixed by DFA) and memory houngryness of
scheduler.

Honza


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28071


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