[Kernel] Remove unused variables in awq/gemm_kernels.cu (#6908)

csrc/quantization/awq/gemm_kernels.cu

@@ -17,14 +17,6 @@ Shang and Dang, Xingyu and Han, Song}, journal={arXiv}, year={2023}
 namespace vllm {
 namespace awq {
 
-// Pack two half values.
-static inline __device__ __host__ unsigned __pack_half2(const half x,
-                                                        const half y) {
-  unsigned v0 = *((unsigned short*)&x);
-  unsigned v1 = *((unsigned short*)&y);
-  return (v1 << 16) | v0;
-}
-
 template <int N>
 __global__ void __launch_bounds__(64)
     gemm_forward_4bit_cuda_m16nXk32(int G, int split_k_iters,
@@ -42,11 +34,7 @@ __global__ void __launch_bounds__(64)
   __shared__ half A_shared[16 * (32 + 8)];
   __shared__ half B_shared[32 * (N + 8)];
 
-  __shared__ half scaling_factors_shared[N];
-  __shared__ half zeros_shared[N];
-
   int j_factors1 = ((OC + N - 1) / N);
-  int blockIdx_x = 0;
   int blockIdx_y = blockIdx.x % ((M + 16 - 1) / 16 * j_factors1);
   int blockIdx_z = blockIdx.x / ((M + 16 - 1) / 16 * j_factors1);
 
@@ -60,7 +48,6 @@ __global__ void __launch_bounds__(64)
 
   static constexpr int row_stride_warp = 32 * 8 / 32;
   static constexpr int row_stride = 2 * 32 * 8 / N;
-  bool ld_zero_flag = (threadIdx.y * 32 + threadIdx.x) * 8 < N;
   // TODO: Haotian: blockIdx_y / j_factors1 in A loading to support bsz > 16
   bool ld_A_flag =
       (blockIdx_y / j_factors1 * 16 + threadIdx.y * row_stride_warp +
@@ -145,11 +132,7 @@ __global__ void __launch_bounds__(64)
       uint32_t B_loaded =
           *(uint32_t*)(B_ptr_local + ax0_ax1_fused_0 * row_stride * (OC / 8));
       uint4 B_loaded_fp16 = dequantize_s4_to_fp16x2(B_loaded);
-      // uint4 B_loaded_zero = *(uint4*)(zeros_shared + (threadIdx.x % (cta_N /
-      // 8)) * 8);
 
-      // uint4 B_loaded_scale = *(uint4*)(scaling_factors_shared + (threadIdx.x
-      // % (cta_N / 8)) * 8);
       // - zero and * scale
       // TODO (Haotian): can save 4 assembly instructions if sormulate as deq =
       // q * scale - zero * scale.
@@ -367,17 +350,11 @@ __global__ void __launch_bounds__(64)
 __global__ void __launch_bounds__(64)
     dequantize_weights(int* __restrict__ B, half* __restrict__ scaling_factors,
                        int* __restrict__ zeros, half* __restrict__ C, int G) {
-  int j_factors1 = 4;
-  int row_stride2 = 4;
-  int split_k_iters = 1;
   static constexpr uint32_t ZERO = 0x0;
   half B_shared[32 * (128 + 8)];
 
   half* B_shared_ptr2 = B_shared;
 
-  half B_shared_warp[32];
-  int OC = 512;
-
   int N = blockDim.x * gridDim.x;  // 2
   int col = (blockIdx.x * blockDim.x + threadIdx.x);
   int row = blockIdx.y * blockDim.y + threadIdx.y;