wehub-resource-sync
58 lines
2.1 KiB
ReStructuredText
58 lines
2.1 KiB
ReStructuredText
.. Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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.. http://www.apache.org/licenses/LICENSE-2.0
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.. Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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copy
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====
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Synchronous element copy ``src → dst`` between global, shared, and register
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(``local``) memory. Four CUDA variants are registered. ``gmem_smem`` (global ↔
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shared) and the two register variants take disjoint memory-scope pairs; ``reg`` and
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``ldstmatrix`` both cover ``register ↔ shared``, where ``ldstmatrix`` is tried first
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and **declines to** ``reg`` unless the layouts are ldmatrix fragments. All three are
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priority 10; the scalar ``fallback`` (priority 0) runs only if they all decline.
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.. list-table::
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:header-rows: 1
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:widths: 22 14 64
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* - Variant
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- Pair
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- Lowering
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* - :doc:`copy/gmem_smem`
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- global ↔ shared
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- synthesized ``[outer, threads, vec]`` partition, vectorized ``copy_Nb``
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* - :doc:`copy/reg`
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- register ↔ shared/global
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- partition induced by the register layout's thread axes
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* - :doc:`copy/ldstmatrix`
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- register ↔ shared
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- warp-collective ``ldmatrix`` / ``stmatrix`` (m8n8 fragments)
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* - :doc:`copy/fallback`
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- any
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- scalar single-thread copy (priority 0, catch-all)
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Each variant has its own deep walkthrough — accepted input, algorithm, a runnable
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demo program, the dispatch's TIRx IR, and the generated CUDA:
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.. toctree::
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:maxdepth: 1
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copy/gmem_smem
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copy/reg
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copy/ldstmatrix
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copy/fallback
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