Function depthwise_conv_3x3_simd 

pub fn depthwise_conv_3x3_simd(
    input: &[f32],
    kernel: &[f32],
    output: &mut [f32],
    h: usize,
    w: usize,
    c: usize,
    stride: usize,
    padding: usize,
)

SIMD-accelerated depthwise 3x3 convolution