mirror of git://gcc.gnu.org/git/gcc.git
275c736e73
This patch implement OpenMP 5.0 requirements of incrementing/decrementing the reference count of a mapped structure at most once (across all elements) on a construct. This is implemented by pulling in libgomp/hashtab.h and using htab_t as a pointer set. Structure element list siblings also have pointers-to-refcounts linked together, to naturally achieve uniform increment/decrement without repeating. There are still some questions on whether using such a htab_t based set is faster/slower than using a sorted pointer array based implementation. This is to be researched on later. libgomp/ChangeLog: * hashtab.h (htab_clear): New function with initialization code factored out from... (htab_create): ...here, adjust to use htab_clear function. * libgomp.h (REFCOUNT_SPECIAL): New symbol to denote range of special refcount values, add comments. (REFCOUNT_INFINITY): Adjust definition to use REFCOUNT_SPECIAL. (REFCOUNT_LINK): Likewise. (REFCOUNT_STRUCTELEM): New special refcount range for structure element siblings. (REFCOUNT_STRUCTELEM_P): Macro for testing for structure element sibling maps. (REFCOUNT_STRUCTELEM_FLAG_FIRST): Flag to indicate first sibling. (REFCOUNT_STRUCTELEM_FLAG_LAST): Flag to indicate last sibling. (REFCOUNT_STRUCTELEM_FIRST_P): Macro to test _FIRST flag. (REFCOUNT_STRUCTELEM_LAST_P): Macro to test _LAST flag. (struct splay_tree_key_s): Add structelem_refcount and structelem_refcount_ptr fields into a union with dynamic_refcount. Add comments. (gomp_map_vars): Delete declaration. (gomp_map_vars_async): Likewise. (gomp_unmap_vars): Likewise. (gomp_unmap_vars_async): Likewise. (goacc_map_vars): New declaration. (goacc_unmap_vars): Likewise. * oacc-mem.c (acc_map_data): Adjust to use goacc_map_vars. (goacc_enter_datum): Likewise. (goacc_enter_data_internal): Likewise. * oacc-parallel.c (GOACC_parallel_keyed): Adjust to use goacc_map_vars and goacc_unmap_vars. (GOACC_data_start): Adjust to use goacc_map_vars. (GOACC_data_end): Adjust to use goacc_unmap_vars. * target.c (hash_entry_type): New typedef. (htab_alloc): New function hook for hashtab.h. (htab_free): Likewise. (htab_hash): Likewise. (htab_eq): Likewise. (hashtab.h): Add file include. (gomp_increment_refcount): New function. (gomp_decrement_refcount): Likewise. (gomp_map_vars_existing): Add refcount_set parameter, adjust to use gomp_increment_refcount. (gomp_map_fields_existing): Add refcount_set parameter, adjust calls to gomp_map_vars_existing. (gomp_map_vars_internal): Add refcount_set parameter, add local openmp_p variable to guard OpenMP specific paths, adjust calls to gomp_map_vars_existing, add structure element sibling splay_tree_key sequence creation code, adjust Fortran map case to avoid increment under OpenMP. (gomp_map_vars): Adjust to static, add refcount_set parameter, manage local refcount_set if caller passed in NULL, adjust call to gomp_map_vars_internal. (gomp_map_vars_async): Adjust and rename into... (goacc_map_vars): ...this new function, adjust call to gomp_map_vars_internal. (gomp_remove_splay_tree_key): New function with code factored out from gomp_remove_var_internal. (gomp_remove_var_internal): Add code to handle removing multiple splay_tree_key sequence for structure elements, adjust code to use gomp_remove_splay_tree_key for splay-tree key removal. (gomp_unmap_vars_internal): Add refcount_set parameter, adjust to use gomp_decrement_refcount. (gomp_unmap_vars): Adjust to static, add refcount_set parameter, manage local refcount_set if caller passed in NULL, adjust call to gomp_unmap_vars_internal. (gomp_unmap_vars_async): Adjust and rename into... (goacc_unmap_vars): ...this new function, adjust call to gomp_unmap_vars_internal. (GOMP_target): Manage refcount_set and adjust calls to gomp_map_vars and gomp_unmap_vars. (GOMP_target_ext): Likewise. (gomp_target_data_fallback): Adjust call to gomp_map_vars. (GOMP_target_data): Likewise. (GOMP_target_data_ext): Likewise. (GOMP_target_end_data): Adjust call to gomp_unmap_vars. (gomp_exit_data): Add refcount_set parameter, adjust to use gomp_decrement_refcount, adjust to queue splay-tree keys for removal after main loop. (GOMP_target_enter_exit_data): Manage refcount_set and adjust calls to gomp_map_vars and gomp_exit_data. (gomp_target_task_fn): Likewise. * testsuite/libgomp.c-c++-common/refcount-1.c: New testcase. * testsuite/libgomp.c-c++-common/struct-elem-1.c: New testcase. * testsuite/libgomp.c-c++-common/struct-elem-2.c: New testcase. * testsuite/libgomp.c-c++-common/struct-elem-3.c: New testcase. * testsuite/libgomp.c-c++-common/struct-elem-4.c: New testcase. * testsuite/libgomp.c-c++-common/struct-elem-5.c: New testcase. |
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