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[SYCL] Allow alignment property to be used for group load/store #16882

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againull merged 9 commits into from
Feb 10, 2025
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[SYCL] Allow alignment property to be used for group load/store #16882

againull merged 9 commits into from
Feb 10, 2025

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@againull againull commented Feb 4, 2025 •
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It makes possible to provide alignment property to the load/store operations indicating the known alignment of the pointer. It will allow to avoid expensive dynamic alignment checks.

@againull againull requested review from a team as code owners February 4, 2025 16:03
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againull commented Feb 4, 2025 •
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As far as I understand, another way of doing this will be to handle annotated_ptr with alignment property, and I will add that possibility separately. But currently annotated_ptr is only supported for pointers to the global address space (and here we need local address space support as well) and right now it is not clear to me how much work it requires to add local address space support to annotated_ptr and whether it makes sense. So this alternative approach gives immediate benefit for both local and global pointers.

@againull againull force-pushed the alignment_load_store branch from 1e118e5 to 936ddbf Compare February 4, 2025 16:10
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[SYCL] Allow alignment property to be used for group load/store
f9fec27 
It makes possible to provide alignment<value> property to the
load/store operations indicating the alignment of the pointer.
It will allow to avoid expensive dynamic alignment checks.
@againull againull force-pushed the alignment_load_store branch from 122fab6 to f9fec27 Compare February 4, 2025 23:39
@againull againull mentioned this pull request Feb 5, 2025
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gmlueck commented Feb 5, 2025

As far as I understand, another way of doing this will be to handle annotated_ptr with alignment property, and I will add that possibility separately. But currently annotated_ptr is only supported for pointers to the global address space (and here we need local address space support as well) and right now it is not clear to me how much work it requires to add local address space support to annotated_ptr and whether it makes sense. So this alternative approach gives immediate benefit for both local and global pointers.

I don't think this is necessary. The APIs in this extension do not currently support annotated_ptr and they already take properties in another way.

@againull againull requested a review from gmlueck February 6, 2025 01:50
bader
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gmlueck approved these changes Feb 6, 2025
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Spec changes LGTM

againull added a commit that referenced this pull request Feb 7, 2025
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[SYCL] Simplify group load/store implementation (#16890)
bc59e74 
Simplify handling of multiple address spaces and alignment checks.
Additional improvement regarding alignment checks is being done here (to
perform compile-time alignment check instead of expensive dynamic
check): #16882
Also this PR fixes alignment requirement for local address space:
16-byte alignment is required for both load and store.
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againull commented Feb 7, 2025 •
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sampling_3D.cpp failure on HIP/AMD is unrelated and visible on other PRs, reported it here: #16933

@againull againull merged commit fcc330e into intel:sycl Feb 10, 2025
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@againull againull deleted the alignment_load_store branch September 29, 2025 21:30
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@gmlueck gmlueck gmlueck approved these changes

@sergey-semenov sergey-semenov sergey-semenov approved these changes

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