b9828

opencl: flash attention improvement (#25069)

• opencl: rework FA kernel for f16 and f32

• opencl: flash-attention prefill prepass kernels

• flash_attn_kv_pad_f16 pads the tail KV tile to a BLOCK_N multiple
• flash_attn_mask_pad_f16 pads the matching mask tile
• flash_attn_blk_f16 classifies each KV tile per query block as
  fully masked / mixed / fully unmasked, so
  the main kernel can skip fully-masked tiles
  and the mask lookup for fully-unmasked ones

• opencl: FA kernels for q4_0 and q8_0

• opencl: set_rows for f32 to q8_0/q4_0

• opencl: dequant kernels for q4_0 and q8_0

• opencl: add FA tile tuning table with override

• opencl: wire host side for FA

• opencl: q4_0 MoE tensors are also SOA'ed

• opencl: cosmetic fix

• opencl: refactor, also clarify some code paths in comments

• opencl: fix inifity for -cl-finite-math-only

---

Co-authored-by: Li He lih@qti.qualcomm.com

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 7.2)
• 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 x64 (Vulkan)
• Windows x64 (OpenVINO)
• Windows x64 (SYCL)
• Windows x64 (HIP)

openEuler:

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

UI:

• UI