[Bug fortran/83064] DO CONCURRENT and auto-parallelization

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83064

Thomas Koenig <tkoenig at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #31 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Hm, on my system (current trunk), with the unrolled loop, parallelization
only happens with -Ofast:

$ gfortran -ftree-parallelize-loops=2 -O1 conc.f90 && time ./a.out
 PI   3.1415926553497115     
 PI   3.14159274    

real    0m0.313s
user    0m0.345s
sys     0m0.001s
$ gfortran -ftree-parallelize-loops=2 -O2 conc.f90 && time ./a.out
 PI   3.1415926553497115     
 PI   3.14159274    

real    0m0.273s
user    0m0.272s
sys     0m0.001s
$ gfortran -ftree-parallelize-loops=2 -O3 conc.f90 && time ./a.out
 PI   3.1415926553497115     
 PI   3.14159274    

real    0m0.278s
user    0m0.278s
sys     0m0.001s
$ gfortran -ftree-parallelize-loops=2 -Ofast conc.f90 && time ./a.out
 PI   3.1415926553497115     
 PI   3.14159274    

real    0m0.152s
user    0m0.296s
sys     0m0.001s

However, the wrong-code bug is indeed fixed. I'll look at paralellization
separately.