https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87622
--- Comment #5 from Andreas Klein <klein at cage dot ugent.be> --- On Wed, 17 Oct 2018, tkoenig at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87622 > > --- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- > Some more remarks: In a benchmark, it is best to actually fill the values of > all read variables to something defined, for example with a call to > random_number. Also, if you generate values which you do not use later, the > compilet may decide to remove the calculation altogether. What works well for > this somethinh like > > read (*,*) i,j > print *, a(i,j) > Adding initialzation removes the effect. There is still a 20% decresed performance, but that are plausible cache effects. Sorry my minimal example was to minimal. I derived the mini example from a big parallel linear algebra package. Now I must go throgh all minimalization steps, but its possible that the original error has nothing to do with coarrays.
