https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111428
--- Comment #3 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Still difficult to track down. The following is a smaller reproducer:
program main
implicit none
integer, parameter :: n=5, m=3
integer, dimension(n,m) :: v
real, dimension(n,m) :: r
do
call random_number(r)
v = int(r * 2)
if (count(v < 1) > 1) exit
end do
write (*,*) 'asdf'
end program main
I compiled libgfortran without vector but this doesn't change anything. It's
really just the vectorization of that snippet but I haven't figured out why,
yet. The stack before the random_number call looks identical.
Also tried valgrind which complains about compares dependent on uninitialized
data (those only show up once compiled with vectorization). However I suspect
those are false negatives after chasing them for some hours.
Going to try another angle of attack. Maybe it's a really simple thing I
overlooked.
