[Bug middle-end/13776] [4.0 Regression] Many C++ compile-time regressions for MICO's ORB code

[steven at gcc dot gnu dot org]

------- Additional Comments From steven at gcc dot gnu dot org  2005-01-26 11:36 -------
It would be a Good Thing to look at the hash function.  The number of
collisions per search is extremely high:

String pool
entries         128928
identifiers     128928 (100.00%)
slots           262144
bytes           1846k (142k overhead)
table size      2048k
coll/search     0.8518
ins/search      0.2747
avg. entry      14.66 bytes (+/- 17.60)
longest entry   830


There is also still a lot of memory allocated at the end of the compilation:

Memory still allocated at the end of the compilation process
Size   Allocated        Used    Overhead
8           4096         200         120
16          4264k       1211k         91k
64            29M         10M        476k
128         3920k       1472k         53k
256         1240k        519k         16k
512         4084k       2026k         55k
1024         488k        390k       6832
2048        2628k       1998k         35k
4096        1160k       1160k         15k
8192         376k        368k       2632
16384        304k        288k       1064
32768        160k        128k        280
65536        704k        640k        616
131072        384k        384k        168
262144        512k        512k        112
524288        512k        512k         56
112           26M         19M        373k
208           63M         43M        883k
48            27M         14M        443k
32            18M         10M        337k
80            13M         13M        186k
Total        199M        122M       2982k

Note especially the 43MB.  All of that is in the et-forest alloc-pools.
Perhaps we should allocate/free them per function.

Finally, we allocate a lot of SSA_NAMEs, and varrays are problematic as
always:
source location                                     Garbage            Freed   
         Leak         Overhead            Times
varray.c:170 (varray_grow)                         39485908: 3.3% 
280747780:47.6%     229448: 0.2%   80866528:32.0%     552682
tree-ssanames.c:197 (make_ssa_name)                94292264: 7.9%          0:
0.0%          0: 0.0%    8572024: 3.4%    1071503


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13776