ergawy wrote:
Thanks @skatrak and @bhandarkar-pranav for the approval.
@kiranchandramohan @clementval I think there is a pretty simple solution that
enables us to mark multi-range loop nests. I think we can add an optional
attribute to the `fir::DoLoopOp` to store the loop nest depth: `nest_depth(n)`.
So for the following input:
```fortran
do concurrent (i=1:10, j=1:10)
end do
```
The MLIR would look like this:
```mlir
fir.do_loop %arg0 = %10 to %11 step %c1 unordered nest_depth(2) {
%14 = fir.convert %arg0 : (index) -> i32
fir.store %14 to %3#1 : !fir.ref<i32>
fir.do_loop %arg1 = %12 to %13 step %c1_2 unordered {
%15 = fir.convert %arg1 : (index) -> i32
fir.store %15 to %1#1 : !fir.ref<i32>
....
}
}
```
I think this is a non-distruptive change to the op that enables us to model
loop nests more easily.
@clementval as for the locality specifiers, I am working on a PoC (based-on
which I will write an RFC) to have a shared "Data Environemt" dialect that can
be used across `do concurrent`, OpenMP, and OpenACC. I published what I have so
far in https://github.com/llvm/llvm-project/pull/128148.
https://github.com/llvm/llvm-project/pull/127595
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