b8315

vulkan: fix SSM_CONV PP scaling with large ubatch sizes (#20379)

• vulkan: optimize SSM_CONV workgroup dispatch for large ubatch

Tile tokens into 2D workgroups (32x16) to reduce workgroup launch overhead at large ubatch sizes. Add vec4 fast path for nc=4 (common d_conv size). Fixes PP performance degradation with ubatch > 512.

Ref: ggml-org/llama.cpp#18725

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

• vulkan: remove unused shared memory declaration in SSM_CONV

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

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Co-authored-by: Progeny Alpha ProgenyAlpha@users.noreply.github.com Co-authored-by: Claude Opus 4.6 noreply@anthropic.com

macOS/iOS:

• macOS Apple Silicon (arm64)
• macOS Intel (x64)
• iOS XCFramework

Linux:

• Ubuntu x64 (CPU)
• Ubuntu x64 (Vulkan)
• Ubuntu x64 (ROCm 7.2)
• Ubuntu s390x (CPU)

Windows:

• Windows x64 (CPU)
• Windows arm64 (CPU)
• Windows x64 (CUDA 12) - CUDA 12.4 DLLs
• Windows x64 (CUDA 13) - CUDA 13.1 DLLs
• Windows x64 (Vulkan)
• Windows x64 (SYCL)
• Windows x64 (HIP)

openEuler:

• openEuler x86 (310p)
• openEuler x86 (910b, ACL Graph)
• openEuler aarch64 (310p)
• openEuler aarch64 (910b, ACL Graph)