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qwen4exp: sum the indexer heads by slices (#28023) qwen4exp: sum the indexer heads by slices The head reduction went through a transpose and a sum_rows over ne[1], which left sum_rows with ne0 = 4, one block per row for a four element reduction, and the transpose copied the whole block by token surface twice on the way in. The heads are adjacent on ne[1], so each one is a strided view and the sum is a short chain of adds. RTX PRO 6000, Qwen3.8-Flash-Next UD-Q4_K_XL, fa on, 55k context, warm runs on top of #28011: prompt processing 2170 -> 2366 t/s Generation is unaffected. The removed work scales with n_blocks by n_tokens, so the gain grows with context and with ubatch size. qwen4exp: drop the redundant cont on the indexer query rope returns a freshly allocated, contiguous tensor, so the reshape that feeds the matmul does not need a copy. ggml_reshape_3d asserts contiguity, so a layout that would need the cont cannot slip through silently. Greedy output is unchanged token for token. Address review from @ggerganov Website: https://llama.app Attestations: https://github.com/ggml-org/llama.cpp/attestations/44321551 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 7.14) 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 7.14) openEuler: DISABLED openEuler x86 (310p) openEuler x86 (910b, ACL Graph) openEuler aarch64 (310p) openEuler aarch64 (910b, ACL Graph) UI: UI

Source: llama.cpp Releases | 2026-09-01