OpenMP 5.0 (GNU libgomp)

2.2 OpenMP 5.0

New features listed in Appendix B of the OpenMP specification

Description	Status	Comments
Array shaping	N
Array sections with non-unit strides in C and C++	N
Iterators	Y
`metadirective` directive	N
`declare variant` directive	P	simd traits not handled correctly
target-offload-var ICV and `OMP_TARGET_OFFLOAD` env variable	Y
Nested-parallel changes to max-active-levels-var ICV	Y
`requires` directive	P	Only fulfillable requirement are `atomic_default_mem_order` and `dynamic_allocators`
`teams` construct outside an enclosing target region	Y
Non-rectangular loop nests	P	Only C/C++
`!=` as relational-op in canonical loop form for C/C++	Y
`nonmonotonic` as default loop schedule modifier for worksharing-loop constructs	Y
Collapse of associated loops that are imperfectly nested loops	N
Clauses `if`, `nontemporal` and `order(concurrent)` in `simd` construct	Y
`atomic` constructs in `simd`	Y
`loop` construct	Y
`order(concurrent)` clause	Y
`scan` directive and `in_scan` modifier for the `reduction` clause	Y
`in_reduction` clause on `task` constructs	Y
`in_reduction` clause on `target` constructs	P	`nowait` only stub
`task_reduction` clause with `taskgroup`	Y
`task` modifier to `reduction` clause	Y
`affinity` clause to `task` construct	Y	Stub only
`detach` clause to `task` construct	Y
`omp_fulfill_event` runtime routine	Y
`reduction` and `in_reduction` clauses on `taskloop` and `taskloop simd` constructs	Y
`taskloop` construct cancelable by `cancel` construct	Y
`mutexinoutset` dependence-type for `depend` clause	Y
Predefined memory spaces, memory allocators, allocator traits	Y	Some are only stubs
Memory management routines	Y
`allocate` directive	N
`allocate` clause	P	initial support
`use_device_addr` clause on `target data`	Y
`ancestor` modifier on `device` clause	P	Reverse offload unsupported
Implicit declare target directive	Y
Discontiguous array section with `target update` construct	N
C/C++’s lvalue expressions in `to`, `from` and `map` clauses	N
C/C++’s lvalue expressions in `depend` clauses	Y
Nested `declare target` directive	Y
Combined `master` constructs	Y
`depend` clause on `taskwait`	Y
Weak memory ordering clauses on `atomic` and `flush` construct	Y
`hint` clause on the `atomic` construct	Y	Stub only
`depobj` construct and depend objects	Y
Lock hints were renamed to synchronization hints	Y
`conditional` modifier to `lastprivate` clause	Y
Map-order clarifications	P
`close` map-type-modifier	Y
Mapping C/C++ pointer variables and to assign the address of device memory mapped by an array section	P
Mapping of Fortran pointer and allocatable variables, including pointer and allocatable components of variables	P	Mapping of vars with allocatable components unsupported
`defaultmap` extensions	Y
`declare mapper` directive	N
`omp_get_supported_active_levels` routine	Y
Runtime routines and environment variables to display runtime thread affinity information	Y
`omp_pause_resource` and `omp_pause_resource_all` runtime routines	Y
`omp_get_device_num` runtime routine	Y
OMPT interface	N
OMPD interface	N

Other new OpenMP 5.0 features

Description	Status	Comments
Supporting C++’s range-based for loop	Y