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A splay-tree was previously used to lookup equivalent target addresses for a given host address on offload targets. However, as splay-trees can modify their structure on lookup, they are not suitable for concurrent access from separate teams/threads without some form of locking. This patch changes the lookup data structure to a hashtab instead, which does not have these issues. The call to build_indirect_map to initialize the data structure is now called from just the first thread of the first team to avoid redundant calls to this function. 2024-03-22 Kwok Cheung Yeung <kcyeung@baylibre.com> libgomp/ * config/accel/target-indirect.c: Include string.h and hashtab.h. Remove include of splay-tree.h. Update comments. (splay_tree_prefix, splay_tree_c): Delete. (struct indirect_map_t): New. (hash_entry_type, htab_alloc, htab_free, htab_hash, htab_eq): New. (GOMP_INDIRECT_ADD_MAP): Remove volatile qualifier. (USE_SPLAY_TREE_LOOKUP): Rename to... (USE_HASHTAB_LOOKUP): ..this. (indirect_map, indirect_array): Delete. (indirect_htab): New. (build_indirect_map): Remove locking. Build indirect map using hashtab. (GOMP_target_map_indirect_ptr): Use indirect_htab to lookup target address. (GOMP_target_map_indirect_ptr): Remove volatile qualifier. * config/gcn/team.c (gomp_gcn_enter_kernel): Call build_indirect_map from first thread of first team only. * config/nvptx/team.c (gomp_nvptx_main): Likewise. * testsuite/libgomp.c-c++-common/declare-target-indirect-2.c (main): Add missing break statements. * testsuite/libgomp.fortran/declare-target-indirect-2.f90: Remove xfail. |
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