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// RLX — versatile ML compiler + runtime.
// Copyright (C) 2026 Eugene Hauptmann, Nataliya Kosmyna.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//! NCHW im2col in `[M, C·kH·kW]` row layout (`M = N · H_out · W_out`).
/// im2col in `[M, C·kH·kW]` row layout (`M = N · H_out · W_out`).
#[allow(clippy::too_many_arguments)]
pub fn im2col_rows_layout(
x: &[f32],
col: &mut [f32],
n: usize,
c_in: usize,
h: usize,
w: usize,
h_out: usize,
w_out: usize,
kh: usize,
kw: usize,
sh: usize,
sw: usize,
ph: usize,
pw: usize,
dh: usize,
dw_dil: usize,
) {
let k = c_in * kh * kw;
let h_isz = h as isize;
let w_isz = w as isize;
let ph_isz = ph as isize;
let pw_isz = pw as isize;
for ni in 0..n {
let x_base = ni * c_in * h * w;
for ho in 0..h_out {
for wo in 0..w_out {
let row = (ni * h_out * w_out + ho * w_out + wo) * k;
let mut elem = 0usize;
for ci in 0..c_in {
for ki in 0..kh {
for kj in 0..kw {
let hi = (ho * sh + ki * dh) as isize - ph_isz;
let wi = (wo * sw + kj * dw_dil) as isize - pw_isz;
col[row + elem] = if hi < 0 || hi >= h_isz || wi < 0 || wi >= w_isz {
0.0
} else {
let hi = hi as usize;
let wi = wi as usize;
x[x_base + (ci * h + hi) * w + wi]
};
elem += 1;
}
}
}
}
}
}
}
/// Run im2col against a contiguous f32 arena (`base` is byte offset 0).
#[allow(clippy::too_many_arguments)]
pub unsafe fn execute_im2col_rows_layout(
x_off: usize,
col_off: usize,
n: u32,
c_in: u32,
h: u32,
w: u32,
h_out: u32,
w_out: u32,
kh: u32,
kw: u32,
sh: u32,
sw: u32,
ph: u32,
pw: u32,
dh: u32,
dw_dil: u32,
base: *mut u8,
) {
unsafe {
let c_in = c_in as usize;
let h = h as usize;
let w = w as usize;
let per_batch = c_in * h * w;
let n_eff = if n == 0 { 0usize } else { n as usize };
let x_floats = if n_eff == 0 {
per_batch.max(1)
} else {
n_eff * per_batch
};
let xs = std::slice::from_raw_parts(base.add(x_off) as *const f32, x_floats);
let n = if n == 0 {
xs.len() / per_batch.max(1)
} else {
n_eff
};
let m = n * h_out as usize * w_out as usize;
let k = c_in * kh as usize * kw as usize;
let cols = std::slice::from_raw_parts_mut(base.add(col_off) as *mut f32, m * k);
im2col_rows_layout(
xs,
cols,
n,
c_in,
h,
w,
h_out as usize,
w_out as usize,
kh as usize,
kw as usize,
sh as usize,
sw as usize,
ph as usize,
pw as usize,
dh as usize,
dw_dil as usize,
);
}
}