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vulkan: add DeepSeek-V4 hyper-connection fused ops (DSV4_HC_COMB/PRE/POST) (#26578) vulkan: add DeepSeek-V4 hyper-connection fused ops (DSV4_HC_COMB/PRE/POST) CUDA has these ops from the DeepSeek-V4 merge and Metal gained them in PR 26459. Vulkan was the last major backend running the unfused primitive chain. On DeepSeek-V4-Flash the unfused Sinkhorn comb chain alone takes about 32% of decode op time on gfx1151 (Strix Halo), spread over roughly 16k dispatches per token. dsv4_hc_comb runs the full 20-iteration Sinkhorn in registers. A token's 4x4 comb matrix lives in 16 consecutive subgroup lanes, with idst in bits 0-1 and isrc in bits 2-3 to match the CPU reference layout, so subgroupShuffleXor by 1|2 reduces rows and by 4|8 reduces columns. One dispatch replaces about 137 strictly ordered node executions per site. The shuffle masks never cross a 16-lane boundary, so a subgroup of size 64 packs 4 independent tokens. dsv4_hc_pre and dsv4_hc_post handle the elementwise stream collapse and fan-out, with per-token coefficients staged in shared memory. GGML_VK_DISABLE_DSV4_HC disables all three ops. The _COMB, _PRE and _POST variants gate each op independently so a single kernel can be bisected against the unfused graph. Adds eval cases at the production n_iter=20 across batch sizes that cross subgroup and workgroup boundaries. vulkan: dsv4 hc review fixes Drop the per-op env-var disables and device flags, the stride divisibility check (ggml guarantees it) and the workgroup-count fallback in supports_op. Trim the comb shader comments to the lane layout. Co-authored-by: Kevin Hopper no-reply@maestro.press Website: https://llama.app Attestations: https://github.com/ggml-org/llama.cpp/attestations/45813191 macOS/iOS: macOS Apple Silicon (arm64) macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED macOS Intel (x64) iOS XCFramework Linux: Ubuntu x64 (CPU) Ubuntu arm64 (CPU) Ubuntu s390x (CPU) Ubuntu x64 (Vulkan) Ubuntu arm64 (Vulkan) Ubuntu x64 (ROCm 10.0) Ubuntu x64 (OpenVINO) Ubuntu x64 (SYCL FP32) Ubuntu x64 (SYCL FP16) Android: Android arm64 (CPU) Windows: Windows x64 (CPU) Windows arm64 (CPU) Windows arm64 (OpenCL Adreno) Windows x64 (CUDA 12) - CUDA 12.4 DLLs Windows x64 (CUDA 13) - CUDA 13.3 DLLs Windows arm64 (CUDA 13) (preview) - CUDA 13.4 DLLs Windows x64 (Vulkan) Windows x64 (OpenVINO) Windows x64 (SYCL) Windows x64 (ROCm 10.0) openEuler: DISABLED openEuler x86 (310p) openEuler x86 (910b, ACL Graph) openEuler aarch64 (310p) openEuler aarch64 (910b, ACL Graph) UI: UI

Source: llama.cpp Releases | 2026-09-07

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