[ET-VK] Allow int4 linear to execute without 8bit buffer support #10030
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## Context Some Vulkan devices do not have support for 8-bit buffers, which is currently required to execute the int4 linear compute shader due to the prepacking shader requiring it. This diff bypasses that restriction by introducing a variant of the prepacking shader that does not need 8-bit buffers. ## Changes Introduce a variant of the int4 weight prepacking shader that interprets the tensor data as an array of `uint` instead of `uint8_t`. Each `uint` represents 4 `uint8_t` values. Differential Revision: [D72750897](https://our.internmc.facebook.com/intern/diff/D72750897/) [ghstack-poisoned]
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10030
Note: Links to docs will display an error until the docs builds have been completed. ✅ No FailuresAs of commit 92f11a3 with merge base 6d1caca ( This comment was automatically generated by Dr. CI and updates every 15 minutes. |
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## Context Some Vulkan devices do not have support for 8-bit buffers, which is currently required to execute the int4 linear compute shader due to the prepacking shader requiring it. This diff bypasses that restriction by introducing a variant of the prepacking shader that does not need 8-bit buffers. ## Changes Introduce a variant of the int4 weight prepacking shader that interprets the tensor data as an array of `uint` instead of `uint8_t`. Each `uint` represents 4 `uint8_t` values. Differential Revision: [D72750897](https://our.internmc.facebook.com/intern/diff/D72750897/) ghstack-source-id: 277173967 Pull Request resolved: #10030
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This pull request was exported from Phabricator. Differential Revision: D72750897 |
…upport" ## Context Some Vulkan devices do not have support for 8-bit buffers, which is currently required to execute the int4 linear compute shader due to the prepacking shader requiring it. This diff bypasses that restriction by introducing a variant of the prepacking shader that does not need 8-bit buffers. ## Changes Introduce a variant of the int4 weight prepacking shader that interprets the tensor data as an array of `uint` instead of `uint8_t`. Each `uint` represents 4 `uint8_t` values. Differential Revision: [D72750897](https://our.internmc.facebook.com/intern/diff/D72750897/) [ghstack-poisoned]
SS-JIA
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Pull Request resolved: #10030 ## Context Some Vulkan devices do not have support for 8-bit buffers, which is currently required to execute the int4 linear compute shader due to the prepacking shader requiring it. This diff bypasses that restriction by introducing a variant of the prepacking shader that does not need 8-bit buffers. ## Changes Introduce a variant of the int4 weight prepacking shader that interprets the tensor data as an array of `uint` instead of `uint8_t`. Each `uint` represents 4 `uint8_t` values. Differential Revision: [D72750897](https://our.internmc.facebook.com/intern/diff/D72750897/) ghstack-source-id: 277175676
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This pull request was exported from Phabricator. Differential Revision: D72750897 |
…upport" ## Context Some Vulkan devices do not have support for 8-bit buffers, which is currently required to execute the int4 linear compute shader due to the prepacking shader requiring it. This diff bypasses that restriction by introducing a variant of the prepacking shader that does not need 8-bit buffers. ## Changes Introduce a variant of the int4 weight prepacking shader that interprets the tensor data as an array of `uint` instead of `uint8_t`. Each `uint` represents 4 `uint8_t` values. Differential Revision: [D72750897](https://our.internmc.facebook.com/intern/diff/D72750897/) [ghstack-poisoned]
This was referenced Apr 15, 2025
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This pull request was exported from Phabricator. Differential Revision: D72750897 |
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Stack from ghstack (oldest at bottom):
Context
Some Vulkan devices do not have support for 8-bit buffers, which is currently required to execute the int4 linear compute shader due to the prepacking shader requiring it.
This diff bypasses that restriction by introducing a variant of the prepacking shader that does not need 8-bit buffers.
Changes
Introduce a variant of the int4 weight prepacking shader that interprets the tensor data as an array of
uintinstead ofuint8_t. Eachuintrepresents 4uint8_tvalues.Differential Revision: D72750897