[flang-commits] [flang] [flang] Allow lowering of sub-expressions to be overridden (PR #69944)

[Kiran Chandramohan via flang-commits]

https://github.com/kiranchandramohan approved this pull request.

> We would first need to define the lowering parallelism requirements here. Is to lower expressions of a single statement in parallel, or is it to allow different program units to be lowered in parallel? The former seems hard and of little practicality to me. The latter makes more sense, and then, I think we could modify the bridge a bit in order to have a "converter" instance per thread/program unit lowering, in which case this change is not a blocker (sub-expression override would only impact a single thread/program unit lowering).

Makes sense.

Thanks @jeanPerier once again for your help here.

https://github.com/llvm/llvm-project/pull/69944