Function w8a16_gemm_n128_m128 

pub fn w8a16_gemm_n128_m128(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    input: DevicePtr,
    weight_t: DevicePtr,
    block_scale_t: DevicePtr,
    output: DevicePtr,
    m: u32,
    n: u32,
    k: u32,
    stream: u64,
) -> Result<()>

2026-09-25: Transposed W8A16 GEMM with a 128x128 MxN tile (kernel w8a16_gemm_t_m128): two 64-row chunks, 8 warps, m16n8k16 BF16 MMA, and the block scale folded into an FP32 accumulator once per 128-K block (kernels/gb10/common/w8a16_gemm_t_m128.cu). Same arguments and layout as w8a16_gemm_t, so it takes the output of the transpose_fp8 / transpose_block_scale kernels unchanged.