pub unsafe fn gemm_fallback_f64(
m: usize,
n: usize,
k: usize,
alpha: f64,
a: *const f64,
a_rs: usize,
a_cs: usize,
b: *const f64,
b_rs: usize,
b_cs: usize,
beta: f64,
c: *mut f64,
c_rs: usize,
c_cs: usize,
)