Fix sum_k * shape_m overflow

Author: zheanxu

deep_gemm/include/deep_gemm/impls/sm90_fp8_gemm_1d1d.cuh

@@ -189,8 +189,8 @@ sm90_fp8_gemm_1d1d_impl(__nv_fp8_e4m3* gmem_a_ptr, __nv_fp8_e4m3* gmem_b_ptr,
                     // Prepare next tensor map
                     sum_k += scheduler.current_shape_k;
                     if (scheduler.next_group_idx < kNumGroups) {
-                        tensor_map_replace_global_addr_in_smem(smem_tensor_map_a[next_stage_idx], gmem_a_ptr + sum_k * shape_m);
-                        tensor_map_replace_global_addr_in_smem(smem_tensor_map_b[next_stage_idx], gmem_b_ptr + sum_k * shape_n);
+                        tensor_map_replace_global_addr_in_smem(smem_tensor_map_a[next_stage_idx], gmem_a_ptr + static_cast<uint64_t>(sum_k) * shape_m);
+                        tensor_map_replace_global_addr_in_smem(smem_tensor_map_b[next_stage_idx], gmem_b_ptr + static_cast<uint64_t>(sum_k) * shape_n);
                         tensor_map_replace_global_inner_dim_stride_in_smem(smem_tensor_map_a[next_stage_idx], scheduler.next_shape_k, scheduler.next_shape_k);
                         tensor_map_replace_global_inner_dim_stride_in_smem(smem_tensor_map_b[next_stage_idx], scheduler.next_shape_k, scheduler.next_shape_k);
                         *(gmem_tensor_map_a[next_stage_idx]) = *(smem_tensor_map_a[next_stage_idx]);