[Flang][OpenMP] Important issues to be fixed prior to flang-new to flang renaming

[kiranchandramohan]

TODOs for unsupported OpenMP 5.2 features

• [ ] conditional modifier for lastprivate
• [ ] iterator modifier for affinity, depend, from, map, to
• [ ] inscan modifier for reduction
• [ ] scan directive : In progress https://github.com/llvm/llvm-project/pull/102792 @anchuraj
• [ ] task modifier for reduction clause
• [ ] in_reduction clause for task and target
• [ ] task_reduction clause for taskgroup
• [ ] reduction, in_reduction clause for taskloop
• [ ] close map-type modifier for map clause
• [ ] none parameter for defaultmap clause
• [ ] declare mapper directive
• [ ] collapse of imperfectly nested loops for simd, worksharing, distribute and taskloop
• [ ] affinity clause for task
• [ ] detach clause for task
• [ ] cancel construct : support for taskloop
• [ ] mutexinoutset for depend clause
• [ ] ancestor modifier for device clause of target construct
• [ ] depend clause for taskwait
• [ ] acq_rel, acquire, release clauses for atomic construct
• [ ] depend clause extensions to support iterators and depend objects with depobj construct
• [ ] Combined constructs master taskloop, parallelmaster, parallel master taskloop, master taskloop simd, parallel master taskloop simd
• [ ] iterators in map clause and data motion clauses of target update
• [ ] present argument for defaultmap
• [ ] align clause on allocate directive
• [ ] allocator and align modifiers for allocate clause
• [ ] adjust_args and append_args clauses for declare variant directive
• [ ] dispatch construct
• [ ] Assumption directives
• [ ] nothing directive
• [ ] error directive
• [ ] Loop transformation constructs
• [ ] scope directive
• [ ] strict modifier for grainsize and num_tasks clause
• [ ] thread_limit clause for target directive
• [ ] has_device_addr clause for target construct
• [ ] interop directive
• [ ] nowait clause for task directive
• [ ] compare, fail clauses
• [ ] seq_cst clause for flush construct
• [ ] inoutset argument for depend clause
• [ ] Allow copyprivate, nowait on the directive (in addition to end directive)
• [ ] Deprecation of destroy with depobj
• [ ] step modifier for linear. Deprecation
• [ ] Deprecation of modifiers without comma separators
• [ ] enter as synonym for to clause in declare target . to clause is deprecated.
• [ ] declare mapper directive extension to accept iterator-modifier and the present map-type-modifier
• [ ] allocators construct. allocate directive for ALLOCATE statement is deprecated
• [ ] dispatch construct has optional end directive
• [ ] otherwise clause as synonym for default on metadirective
• [ ] allocate and firstprivate for scope directive
• [ ] target enter and exit data has default map type
• [ ] doacross clause as synonym for depend in some situations

Must fix issues from the tracker

Must fix issues not in tracker

• [ ] Default loop schedule modifier for worksharing-loop constructs without static schedule and ordered clause is nonmonotonic since OpenMP 5.0
• [ ] Privatization issues in interfacing with OpenMPIRBuilder. https://discourse.llvm.org/t/rfc-openmp-fix-issue-in-mlir-to-llvmir-translation-for-delayed-privatisation/81225
• [ ] Support for deferred task execution

[anchuraj]

inscan modifier support is WIP

[kiranchandramohan]

inscan modifier support is WIP

Feel free to update the tasklist if you or someone you know is working on it. The immediate requirement is to only add a TODO message after parsing and semantics.