[Bug ipa/62016] [4.8/4.9/4.10 Regression] very slow compilation at -O3 on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62016

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |compile-time-hog
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-08-05
   Target Milestone|---                         |4.8.4
            Summary|very slow compilation at    |[4.8/4.9/4.10 Regression]
                   |-O3 on x86_64-linux-gnu     |very slow compilation at
                   |                            |-O3 on x86_64-linux-gnu
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  4.8 is slowest (very very slow), 4.9 is a lot better but still
100x slower than 4.7.

4.7:

 TOTAL                 :   0.09             0.01             0.10              
6621 kB

4.8:

<not finished after 6min 30s>

4.9:

 ipa inlining heuristics :   2.99 (93%) usr   0.12 (92%) sys   3.11 (93%) wall 
406507 kB (99%) ggc

4.10 (take with grain of salt - unoptimized and with checking):

 ipa inlining heuristics :   6.81 (90%) usr   0.15 (94%) sys   6.95 (90%) wall 
426678 kB (99%) ggc