import triton
import triton.language as tl
import torch


def torch_silu_and_mul_ref(input):
    """
    Performs the SiLU activation on the first half of the input tensor and
    multiplies it element-wise with the second half.
    Args:
        input (torch.Tensor): Input tensor of shape [..., 2 * d].
        param (float): Parameter for the SiLU activation function.
    Returns:
        torch.Tensor: Output tensor of shape [..., d].
    """
    dtype = input.dtype
    d = input.size(-1) // 2
    A, B = input[:, :d], input[:, d:]

    silu_A = A / (1.0 + torch.exp(-A.float()))

    output = silu_A * B

    return output.to(dtype)