tree e818018eeb08fe566d211ef84f79f1ac2fa90d73
parent d1eb334f7b24ee865601d3ab067e05a86802c4d1
author Andrew Stubbs <ams@codesourcery.com> 1655736675 +0100
committer Andrew Stubbs <ams@codesourcery.com> 1656347284 +0100

amdgcn: libgomp plugin USM implementation

Implement the Unified Shared Memory API calls in the GCN plugin.

The allocate and free are pretty straight-forward because all "target" memory
allocations are compatible with USM, on the right hardware.  However, there's
no known way to check what memory region was used, after the fact, so we use a
splay tree to record allocations so we can answer "is_usm_ptr" later.

libgomp/ChangeLog:

	* plugin/plugin-gcn.c (struct usm_splay_tree_key_s): New.
	(usm_splay_compare): New.
	(splay_tree_prefix): New.
	(GOMP_OFFLOAD_usm_alloc): New.
	(GOMP_OFFLOAD_usm_free): New.
	(GOMP_OFFLOAD_is_usm_ptr): New.
	(GOMP_OFFLOAD_supported_features): Move into the OpenMP API fold.
	Add GOMP_REQUIRES_UNIFIED_ADDRESS and
	GOMP_REQUIRES_UNIFIED_SHARED_MEMORY.
	(gomp_fatal): New.
	(splay_tree_c): New.
	* testsuite/lib/libgomp.exp (check_effective_target_omp_usm): New.
	* testsuite/libgomp.c++/usm-1.C: Use dg-require-effective-target.
	* testsuite/libgomp.c-c++-common/requires-1.c: Likewise.
	* testsuite/libgomp.c/usm-1.c: Likewise.
	* testsuite/libgomp.c/usm-2.c: Likewise.
	* testsuite/libgomp.c/usm-3.c: Likewise.
	* testsuite/libgomp.c/usm-4.c: Likewise.
	* testsuite/libgomp.c/usm-5.c: Likewise.
	* testsuite/libgomp.c/usm-6.c: Likewise.