[Bug rtl-optimization/8361] [3.4/4.0/4.1 regression] C++ compile-time performance regression

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-18 19:27 -------
Even the -fno-inline case slowed down too:
pc64:~/src/pr8361> time ~/onetest.release/bin/gcc pr8361.ii -S -m32 -O1 -fno-inline
11.171u 0.359s 0:11.66 98.7%    0+0k 0+0io 0pf+0w
pc64:~/src/pr8361> time gcc-4.0 pr8361.ii -S -m32 -O1 -fno-inline
9.578u 0.295s 0:10.02 98.4%     0+0k 0+0io 0pf+0w


interesting part of 4.1 time report:
 combiner              :   0.36 ( 3%) usr   0.00 ( 0%) sys   0.31 ( 2%) wall    1933 kB ( 0%) ggc
 local alloc           :   0.33 ( 3%) usr   0.00 ( 0%) sys   0.31 ( 2%) wall    3654 kB ( 1%) ggc
 global alloc          :   0.85 ( 8%) usr   0.00 ( 0%) sys   0.75 ( 6%) wall   12187 kB ( 3%) ggc
 tree operand scan     :   0.25 ( 2%) usr   0.10 ( 7%) sys   0.29 ( 2%) wall    9315 kB ( 2%) ggc
 dominator optimization:   0.35 ( 3%) usr   0.01 ( 1%) sys   0.34 ( 3%) wall    3938 kB ( 1%) ggc
 tree PTA              :   0.46 ( 4%) usr   0.02 ( 1%) sys   0.53 ( 4%) wall   19358 kB ( 5%) ggc
 tree alias analysis   :   0.25 ( 2%) usr   0.04 ( 3%) sys   0.27 ( 2%) wall    9734 kB ( 2%) ggc
 tree SSA rewrite      :   0.19 ( 2%) usr   0.00 ( 0%) sys   0.24 ( 2%) wall   10314 kB ( 3%) ggc
 tree SSA incremental  :   0.32 ( 3%) usr   0.00 ( 0%) sys   0.26 ( 2%) wall    2956 kB ( 1%) ggc
 parser                :   1.71 (15%) usr   0.42 (28%) sys   2.07 (16%) wall  154459 kB (39%) ggc
 life analysis         :   0.57 ( 5%) usr   0.01 ( 1%) sys   0.51 ( 4%) wall    3127 kB ( 1%) ggc


corresponding 4.0 time report:
 combiner              :   0.31 ( 3%) usr   0.01 ( 1%) sys   0.28 ( 2%) wall
 local alloc           :   0.35 ( 4%) usr   0.00 ( 0%) sys   0.47 ( 4%) wall
 global alloc          :   0.74 ( 7%) usr   0.01 ( 1%) sys   0.96 ( 8%) wall
 tree operand scan     :   0.18 ( 2%) usr   0.07 ( 5%) sys   0.23 ( 2%) wall
 dominator optimization:   0.42 ( 4%) usr   0.01 ( 1%) sys   0.31 ( 3%) wall
 tree PTA              :   0.14 ( 1%) usr   0.01 ( 1%) sys   0.11 ( 1%) wall
 tree alias analysis   :   0.05 ( 1%) usr   0.00 ( 0%) sys   0.07 ( 1%) wall
 tree SSA rewrite      :   0.17 ( 2%) usr   0.00 ( 0%) sys   0.18 ( 2%) wall
 parser                :   1.71 (17%) usr   0.41 (32%) sys   2.22 (20%) wall
 life analysis         :   0.43 ( 4%) usr   0.00 ( 0%) sys   0.61 ( 5%) wall




-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2005-07-25 01:54:59         |2005-09-18 19:27:11
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=8361