https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63671
Bug ID: 63671
Summary: [5 Regression] 21% tramp3d-v4 performance hit due to
-fdevirtualize
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: trippels at gcc dot gnu.org
CC: hubicka at gcc dot gnu.org
On my AMD machine I get:
markus@x4 ~ % time g++ -Ofast tramp3d-v4.cpp
23.540 total
markus@x4 ~ % ./a.out --cartvis 1.0 0.0 --rhomin 1e-8 -n 20
...
Time spent in iteration: 3.79717
markus@x4 ~ % time g++ -Ofast -fno-devirtualize tramp3d-v4.cpp
22.163 total
markus@x4 ~ % ./a.out --cartvis 1.0 0.0 --rhomin 1e-8 -n 20
...
Time spent in iteration: 2.97514
For gcc-4.9 -fno-devirtualize makes no difference and I get on both cases:
Time spent in iteration: 3.02253
