[Bug middle-end/38474] slow compilation at -O0 (callgraph optimization, inline heuristics, expand )

[jv244 at cam dot ac dot uk]

------- Comment #3 from jv244 at cam dot ac dot uk  2008-12-10 16:13 -------
(In reply to comment #2)
> Confirmed.  4.3 is worse (I ran out of memory).
> 
> Probably the FE presents us with sth funny.
> 
actually, I just got a timing report from 4.3 [4.3.1 20080507 (prerelease)
[gcc-4_3-branch revision 135036]] (on a different machine, but with roughly the
same clock speed, and plenty of RAM):

Execution times (seconds)
 garbage collection    :   1.05 ( 0%) usr   0.00 ( 0%) sys   1.05 ( 0%) wall   
   0 kB ( 0%) ggc
 cfg cleanup           :   0.00 ( 0%) usr   0.00 ( 0%) sys   0.01 ( 0%) wall   
   0 kB ( 0%) ggc
 trivially dead code   :   0.70 ( 0%) usr   0.00 ( 0%) sys   0.70 ( 0%) wall   
   0 kB ( 0%) ggc
 df live regs          :   0.96 ( 0%) usr   0.00 ( 0%) sys   0.96 ( 0%) wall   
   0 kB ( 0%) ggc
 df reg dead/unused notes:   1.11 ( 0%) usr   0.00 ( 0%) sys   1.12 ( 0%) wall 
 25889 kB ( 4%) ggc
 register information  :   0.90 ( 0%) usr   0.00 ( 0%) sys   0.89 ( 0%) wall   
   0 kB ( 0%) ggc
 alias analysis        :   0.82 ( 0%) usr   0.00 ( 0%) sys   0.83 ( 0%) wall   
8335 kB ( 1%) ggc
 rebuild jump labels   :   1.10 ( 0%) usr   0.00 ( 0%) sys   1.10 ( 0%) wall   
   0 kB ( 0%) ggc
 parser                :   3.02 ( 0%) usr   0.12 ( 1%) sys   3.96 ( 0%) wall  
75960 kB (12%) ggc
 inline heuristics     :1862.97 (65%) usr   4.94 (59%) sys2078.10 (65%) wall   
   1 kB ( 0%) ggc
 tree gimplify         :   0.48 ( 0%) usr   0.00 ( 0%) sys   0.47 ( 0%) wall   
3446 kB ( 1%) ggc
 tree eh               :   0.01 ( 0%) usr   0.00 ( 0%) sys   0.01 ( 0%) wall   
   0 kB ( 0%) ggc
 tree CFG construction :   0.03 ( 0%) usr   0.00 ( 0%) sys   0.03 ( 0%) wall   
7151 kB ( 1%) ggc
 expand                : 967.65 (34%) usr   2.96 (35%) sys1102.03 (34%) wall 
357297 kB (54%) ggc
 local alloc           :   5.22 ( 0%) usr   0.08 ( 1%) sys   5.29 ( 0%) wall   
8652 kB ( 1%) ggc
 global alloc          :  12.28 ( 0%) usr   0.27 ( 3%) sys  12.59 ( 0%) wall 
163884 kB (25%) ggc
 thread pro- & epilogue:   0.74 ( 0%) usr   0.00 ( 0%) sys   0.75 ( 0%) wall   
 172 kB ( 0%) ggc
 final                 :   2.91 ( 0%) usr   0.05 ( 1%) sys   2.92 ( 0%) wall   
 541 kB ( 0%) ggc
 symout                :   0.06 ( 0%) usr   0.01 ( 0%) sys   0.07 ( 0%) wall   
5690 kB ( 1%) ggc
 TOTAL                 :2862.03             8.43          3212.90            
657217 kB


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