[Bug tree-optimization/26830] [4.1/4.2 Regression] Insane amount of compile-time / memory needed at -O1 and above

[rguenth at gcc dot gnu dot org]

------- Comment #16 from rguenth at gcc dot gnu dot org  2006-03-24 16:26 -------
With -O1 -fno-tree-ch we get (on ia64 again):

 tree copy propagation : 132.88 (22%) usr   0.07 ( 1%) sys 132.94 (22%) wall   
5037 kB ( 0%) ggc
 tree store copy prop  :  27.43 ( 5%) usr   0.01 ( 0%) sys  27.44 ( 5%) wall   
1090 kB ( 0%) ggc
 tree PHI insertion    :  79.40 (13%) usr   1.74 (31%) sys  81.14 (13%) wall
1512507 kB (77%) ggc
 tree SSA rewrite      :  94.23 (16%) usr   0.09 ( 2%) sys  94.32 (16%) wall  
22257 kB ( 1%) ggc
 dominator optimization:  66.17 (11%) usr   0.07 ( 1%) sys  66.24 (11%) wall  
18901 kB ( 1%) ggc
 tree loop init        :  29.35 ( 5%) usr   0.00 ( 0%) sys  29.35 ( 5%) wall   
   9 kB ( 0%) ggc
 tree SSA uncprop      :  27.61 ( 5%) usr   0.00 ( 0%) sys  27.61 ( 5%) wall   
   0 kB ( 0%) ggc
 expand                :  31.99 ( 5%) usr   0.04 ( 1%) sys  32.04 ( 5%) wall  
49360 kB ( 3%) ggc
 TOTAL                 : 599.15             5.55           604.92           
1964166 kB

so, much more mixed results, but tree copy propagation now being the worst
offender.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26830