pub unsafe extern "C" fn acb_dot(
res: *mut acb_struct,
initial: *mut acb_struct,
subtract: c_int,
x: acb_srcptr,
xstep: mp_limb_signed_t,
y: acb_srcptr,
ystep: mp_limb_signed_t,
len: mp_limb_signed_t,
prec: mp_limb_signed_t,
)