On Thu, Feb 23, 2023 at 07:24:26AM -0800, Damian Rouson wrote: > I wonder if a relatively easy starting point would be enabling the > declaration of do concurrent construct variables: > > do concurrent (integer :: i = 1:n) > > Itβs a minor convenience and less exciting than adding locality specifiers > but possibly a good first exercise. > > > Damian
I've already implemented 95% of the above. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96255 Unfortunately, the last 5% will take me too much time, which I don't have at the moment. Problems arise from the parsing of an iterator is shared by do current, forall, implied-do, and good old do-loops. For the first 3, 'i' is a control variable and is a statement entity (i.e., in the namespace of construct). To do a type spec in one of these cleanly, it would be prudent to either define a namespace for the construct or to use a shadow variable. The shadow variablei, which I was leaning towards, would replace the above with something like do concurrent (integer :: _i = 1:n) '_i' cannot conflict 'i', but this requires walking the execution block of the construct and replacing 'i' with '_i'. Perhaps, starting with the patch in PR96255 would be gentle intro to gfortran hacking. -- Steve
