Tune Vulkan matmul tiles for AMD GCN wave64#6

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rasbid wants to merge 1 commit intomasterfrom

codex/add-amd-gcn-tile-definitions-in-shaders

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rasbid commented Oct 12, 2025

Summary

override the Vulkan matmul and matmul_id tiles on AMD GCN GPUs with wave64-friendly configurations
add an opt-out environment flag and validate LDS usage before applying the new tiles
retain existing tiles automatically when the new layout would exceed shared memory limits

Testing

not run (not requested)

https://chatgpt.com/codex/tasks/task_e_68ebe9181d1c83308aee977524a0e9e4


          Add wave64 matmul tiles for AMD GCN Vulkan devices

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