mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-11-23 19:03:59 +08:00
e7d6c277fa
This implements the OpenMP low-latency memory allocator for AMD GCN using the small per-team LDS memory (Local Data Store). Since addresses can now refer to LDS space, the "Global" address space is no-longer compatible. This patch therefore switches the backend to use entirely "Flat" addressing (which supports both memories). A future patch will re-enable "global" instructions for cases where it is known to be safe to do so. gcc/ChangeLog: * config/gcn/gcn-builtins.def (DISPATCH_PTR): New built-in. * config/gcn/gcn.cc (gcn_init_machine_status): Disable global addressing. (gcn_expand_builtin_1): Implement GCN_BUILTIN_DISPATCH_PTR. libgomp/ChangeLog: * config/gcn/libgomp-gcn.h (TEAM_ARENA_START): Move to here. (TEAM_ARENA_FREE): Likewise. (TEAM_ARENA_END): Likewise. (GCN_LOWLAT_HEAP): New. * config/gcn/team.c (LITTLEENDIAN_CPU): New, and import hsa.h. (__gcn_lowlat_init): New prototype. (gomp_gcn_enter_kernel): Initialize the low-latency heap. * libgomp.h (TEAM_ARENA_START): Move to libgomp.h. (TEAM_ARENA_FREE): Likewise. (TEAM_ARENA_END): Likewise. * plugin/plugin-gcn.c (lowlat_size): New variable. (print_kernel_dispatch): Label the group_segment_size purpose. (init_environment_variables): Read GOMP_GCN_LOWLAT_POOL. (create_kernel_dispatch): Pass low-latency head allocation to kernel. (run_kernel): Use shadow; don't assume values. * testsuite/libgomp.c/omp_alloc-traits.c: Enable for amdgcn. * config/gcn/allocator.c: New file. * libgomp.texi: Document low-latency implementation details. |
||
|---|---|---|
| .. | ||
| accel | ||
| bsd | ||
| darwin | ||
| gcn | ||
| hpux | ||
| linux | ||
| mingw32 | ||
| nvptx | ||
| posix | ||
| rtems | ||
| t-aix | ||