1use crate::layouts::{ScalarZnxToRef, VecZnxToMut, VecZnxToRef};
 2use crate::{
 3    layouts::{ScalarZnx, VecZnx, ZnxInfos, ZnxView, ZnxViewMut},
 4    reference::znx::{ZnxSub, ZnxSubABInplace, ZnxZero},
 5};
 6
 7pub fn vec_znx_sub_scalar<R, A, B, ZNXARI>(res: &mut R, res_col: usize, a: &A, a_col: usize, b: &B, b_col: usize, b_limb: usize)
 8where
 9    R: VecZnxToMut,
10    A: ScalarZnxToRef,
11    B: VecZnxToRef,
12    ZNXARI: ZnxSub + ZnxZero,
13{
14    let a: ScalarZnx<&[u8]> = a.to_ref();
15    let b: VecZnx<&[u8]> = b.to_ref();
16    let mut res: VecZnx<&mut [u8]> = res.to_mut();
17
18    let min_size: usize = b.size().min(res.size());
19
20    #[cfg(debug_assertions)]
21    {
22        assert!(
23            b_limb < min_size,
24            "b_limb: {} > min_size: {}",
25            b_limb,
26            min_size
27        );
28    }
29
30    for j in 0..min_size {
31        if j == b_limb {
32            ZNXARI::znx_sub(res.at_mut(res_col, j), b.at(b_col, j), a.at(a_col, 0));
33        } else {
34            res.at_mut(res_col, j).copy_from_slice(b.at(b_col, j));
35        }
36    }
37
38    for j in min_size..res.size() {
39        ZNXARI::znx_zero(res.at_mut(res_col, j));
40    }
41}
42
43pub fn vec_znx_sub_scalar_inplace<R, A, ZNXARI>(res: &mut R, res_col: usize, res_limb: usize, a: &A, a_col: usize)
44where
45    R: VecZnxToMut,
46    A: ScalarZnxToRef,
47    ZNXARI: ZnxSubABInplace,
48{
49    let a: ScalarZnx<&[u8]> = a.to_ref();
50    let mut res: VecZnx<&mut [u8]> = res.to_mut();
51
52    #[cfg(debug_assertions)]
53    {
54        assert!(res_limb < res.size());
55    }
56
57    ZNXARI::znx_sub_ab_inplace(res.at_mut(res_col, res_limb), a.at(a_col, 0));
58}