Function w8a16_gemm_pipelined_m64_strided 

pub fn w8a16_gemm_pipelined_m64_strided(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    input: DevicePtr,
    weight: DevicePtr,
    block_scale: DevicePtr,
    output: DevicePtr,
    m: u32,
    n: u32,
    k: u32,
    a_row_stride: u32,
    c_row_stride: u32,
    stream: u64,
) -> Result<()>

2026-09-26: Strided launch of w8a16_gemm_pipelined_m64: the arguments and checks of w8a16_gemm_pipelined_m32_strided, grid (ceil(N/32), ceil(M/64), 1), block 256. The multi-seq attention Q/K/V and O arms take it above 32 rows under ModelLevers::fp8_attn_m32.