https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86091
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|FIXED |WORKSFORME
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Vasili Burdo from comment #0)
> I tried multiple GCC versions starting from 5.3 to 8.0.0 on Ubuntu and
> Windows (MINGW) all of them have the same problem.
How did you test it with 5.3 when it doesn't even support fold expressions?
I can't reproduce the slowness with any version of GCC at all.
tmp$ time ~/gcc/6.1.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc -DBUG
real 0m0.284s
user 0m0.234s
sys 0m0.048s
tmp$ time ~/gcc/6.1.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc
real 0m0.267s
user 0m0.235s
sys 0m0.028s
tmp$ time ~/gcc/6.2.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc -DBUG
real 0m1.231s
user 0m0.271s
sys 0m0.081s
tmp$ time ~/gcc/6.2.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc
real 0m0.298s
user 0m0.225s
sys 0m0.037s
tmp$ time ~/gcc/6.3.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc -DBUG
real 0m1.260s
user 0m0.287s
sys 0m0.075s
tmp$ time ~/gcc/6.3.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc
real 0m0.317s
user 0m0.230s
sys 0m0.034s
tmp$ time ~/gcc/6.4.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc -DBUG
real 0m0.280s
user 0m0.239s
sys 0m0.038s
tmp$ time ~/gcc/6.4.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc
real 0m0.264s
user 0m0.226s
sys 0m0.035s
tmp$ time ~/gcc/7.1.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc -DBUG
real 0m0.313s
user 0m0.254s
sys 0m0.056s
tmp$ time ~/gcc/7.1.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc
real 0m0.304s
user 0m0.266s
sys 0m0.036s
tmp$ time ~/gcc/7.2.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc -DBUG
real 0m0.299s
user 0m0.247s
sys 0m0.050s
tmp$ time ~/gcc/7.2.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc
real 0m0.281s
user 0m0.245s
sys 0m0.034s
tmp$ time ~/gcc/7.3.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc -DBUG
real 0m0.574s
user 0m0.534s
sys 0m0.036s
tmp$ time ~/gcc/7.3.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc
real 0m0.632s
user 0m0.592s
sys 0m0.037s
tmp$ time ~/gcc/8.1.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc -DBUG
real 0m0.334s
user 0m0.305s
sys 0m0.027s
tmp$ time ~/gcc/8.1.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc
real 0m0.652s
user 0m0.610s
sys 0m0.040s
tmp$ time ~/gcc/8.2.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc -DBUG
real 0m0.169s
user 0m0.140s
sys 0m0.026s
tmp$ time ~/gcc/8.2.0/bin/g++ -std=gnu++1z -Wall -Wextra 86091.cc
real 0m0.296s
user 0m0.249s
sys 0m0.043s
