Function cblas::dgemm

pub unsafe fn dgemm(
    layout: Layout, 
    transa: Transpose, 
    transb: Transpose, 
    m: i32, 
    n: i32, 
    k: i32, 
    alpha: f64, 
    a: &[f64], 
    lda: i32, 
    b: &[f64], 
    ldb: i32, 
    beta: f64, 
    c: &mut [f64], 
    ldc: i32
)