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From: Andrew Stubbs <ams@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc/devel/omp/gcc-12] libgomp, amdgcn: Switch USM to 128-byte alignment Date: Fri, 13 Jan 2023 17:44:32 +0000 (GMT) [thread overview] Message-ID: <20230113174432.B5EE93858C39@sourceware.org> (raw) https://gcc.gnu.org/g:c9b47ccf32a91d8c851a3e20d1a2f47ed0aaa47e commit c9b47ccf32a91d8c851a3e20d1a2f47ed0aaa47e Author: Andrew Stubbs <ams@codesourcery.com> Date: Fri Jan 13 17:38:39 2023 +0000 libgomp, amdgcn: Switch USM to 128-byte alignment This should optimize cache-lines on the AMD GPUs somewhat. libgomp/ChangeLog: * usm-allocator.c (ALIGN): Use 128-byte alignment. Diff: --- libgomp/usm-allocator.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libgomp/usm-allocator.c b/libgomp/usm-allocator.c index c45109169ca..68c1ebafec2 100644 --- a/libgomp/usm-allocator.c +++ b/libgomp/usm-allocator.c @@ -57,7 +57,8 @@ static int usm_lock = 0; static struct usm_splay_tree_s usm_allocations = { NULL }; static struct usm_splay_tree_s usm_free_space = { NULL }; -#define ALIGN(VAR) (((VAR) + 7) & ~7) /* 8-byte granularity. */ +/* 128-byte granularity means GPU cache-line aligned. */ +#define ALIGN(VAR) (((VAR) + 127) & ~127) /* Coalesce contiguous free space into one entry. This considers the entries either side of the root node only, so it should be called each time a new
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