[Openmp-commits] [PATCH] D58408: [5.0] Deprecate nest-var and associated features

Terry Wilmarth via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Tue Feb 19 14:44:23 PST 2019

tlwilmar created this revision.
tlwilmar added reviewers: AndreyChurbanov, jlpeyton, hbae.
tlwilmar added a project: OpenMP.
Herald added a subscriber: jdoerfert.

Nest-var, OMP_NESTED, omp_set_nested()., and omp_get_nested() have been deprecated in the 5.0 spec.  Initial nesting info is now derived from OMP_MAX_ACTIVE_LEVELS, OMP_NUM_THREADS, and OMP_PROC_BIND.

This patch deprecates the internal ICV that corresponds to nest-var, and replaces it with the max-active-levels-var ICV to determine nesting. The change still allows for use of OMP_NESTED (according to 5.0 changes), omp_get_nested, and omp_set_nested, which have had deprecation messages added to them.  The change allows certain settings of OMP_NUM_THREADS, OMP_PROC_BIND, and OMP_MAX_ACTIVE_LEVELS to turn on nesting, but OMP_NESTED=0 will still force nesting to be off.

The runtime now prints informative messages about deprecation of OMP_NESTED, omp_set_nested(), and omp_get_nested(), when those environment variables or routines are used. It also prints deprecated message in output for KMP_SETTINGS and OMP_DISPLAY_ENV for OMP_NESTED.  This patch also fixes OMP_DISPLAY_ENV output for OMP_TARGET_OFFLOAD.

  rOMP OpenMP



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