Function sgemm 

pub fn sgemm(
    trans_a: bool,
    trans_b: bool,
    m: usize,
    n: usize,
    k: usize,
    alpha: f32,
    a: &[f32],
    lda: usize,
    b: &[f32],
    ldb: usize,
    beta: f32,
    c: &mut [f32],
    ldc: usize,
)

General entry point mirroring the C shim, exposing transpose flags and alpha/beta. Leading dimensions default to the natural row-major strides.