[Bug c++/52147] Preprocessed Chromium source with long compile time

["markus at trippelsdorf dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52147

Markus Trippelsdorf <markus at trippelsdorf dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |markus at trippelsdorf dot
                   |                            |de

--- Comment #4 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2012-02-07 10:51:09 UTC ---
perf record -g g++ -O2 -c /var/tmp/V8DerivedSources08.ii
with 4.7 shows:

# Overhead  Command  
     8.78%  cc1plus  cc1plus                     [.] store_binding
            |
            --- store_binding

     1.94%  cc1plus  libc-2.15.so                [.] memset
            |
            --- memset
               |          
               |--50.00%-- reload_cse_regs_1
               |          
               |--25.00%-- ipcp_generate_summary
               |          
                --24.99%-- inline_analyze_function

     1.89%  cc1plus  cc1plus                     [.] gt_ggc_mx_lang_tree_node
            |
            --- gt_ggc_mx_lang_tree_node

     1.86%  cc1plus  libc-2.15.so                [.] _int_malloc
            |
            --- _int_malloc

     1.73%  cc1plus  cc1plus                     [.] ggc_set_mark
            |
            --- ggc_set_mark

     1.36%  cc1plus  cc1plus                     [.] ggc_internal_alloc_stat
            |
            --- ggc_internal_alloc_stat

     1.27%  cc1plus  cc1plus                     [.] htab_find_slot_with_hash
            |
            --- htab_find_slot_with_hash
               |          
                --100.00%-- (nil)

     1.24%  cc1plus  libc-2.15.so                [.] _int_free
            |
            --- _int_free
               |          
                --100.00%-- compute_may_aliases

     1.07%  cc1plus  cc1plus                     [.] push_to_top_level
            |
            --- push_to_top_level

     0.94%  cc1plus  cc1plus                     [.] bitmap_set_bit
            |
            --- bitmap_set_bit
               |          
               |--22.22%-- 0x31cfaa8
               |          
               |--22.22%-- (nil)
               |          
               |--11.11%-- 0x2b260c8
               |          
               |--11.11%-- 0x2b26308
               |          
               |--11.11%-- 0x31d02b0
               |          
               |--11.11%-- 0x2af1290
               |          
                --11.11%-- 0x32067c8

     0.87%  cc1plus  cc1plus                     [.] lookup_fnfields_idx_nolazy
            |
            --- lookup_fnfields_idx_nolazy

     0.78%  cc1plus  cc1plus                     [.] add_function_candidate
            |
            --- add_function_candidate

     0.77%       as  as                          [.] 0x2f5e5
...