[ET-VK] Replace dynamic UBO indexing with safe_idx across shaders#18515
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SS-JIA merged 1 commit intogh/SS-JIA/510/origfrom Mar 26, 2026
Merged
[ET-VK] Replace dynamic UBO indexing with safe_idx across shaders#18515SS-JIA merged 1 commit intogh/SS-JIA/510/origfrom
SS-JIA merged 1 commit intogh/SS-JIA/510/origfrom
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The Adreno 740 GPU driver crashes (SIGSEGV in vkCreateComputePipelines) when GLSL shaders dynamically index a UBO-backed ivec4/ivec3 with a specialization-constant-derived value. This was causing the skin segmentation model to crash during pipeline creation on Samsung S23. Fix all instances across 18 shader files by replacing patterns like `meta.sizes[packed_dim]` with `safe_idx(meta.sizes, packed_dim)`, which uses an if/else chain that the driver resolves at pipeline creation time. Changes: - Add safe_idx(ivec3) overload to indexing.glslh - Fix transfer_texture.glsl, slice.glslh, select.glslh (transfer ops) - Fix nchw_to_int8x4_buffer.glsl, full_texture.glsl (staging/utility) - Fix gather, split, index_tensor, where, expand, pad, repeat, arange texture shaders (1-line fixes each) - Fix softmax.glsl, reduce.glsl, reduce2d.glsl, var_texture3d.glsl (reduction shaders with multiple fixes + added indexing.glslh include) - Remove unused ShaderNameUtils.h include from Slice.cpp Differential Revision: [D98220450](https://our.internmc.facebook.com/intern/diff/D98220450/) ghstack-source-id: 357844383 Pull Request resolved: #18512
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18515
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #18512 by @SS-JIA
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/511/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/511/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/510/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/511/orig
Differential Revision: D98220450
@diff-train-skip-merge