pic-scale 0.7.5

/*
 * Copyright (c) Radzivon Bartoshyk. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1.  Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2.  Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3.  Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANUSE_FMATIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
use crate::filter_weights::FilterBounds;
use crate::neon::utils::*;
use core::f16;
use std::arch::aarch64::*;

#[inline]
#[target_feature(enable = "neon,fp16")]
pub(crate) fn xconvolve_vertical_part_neon_8_f16<const USE_BLENDING: bool>(
    start_y: usize,
    start_x: usize,
    src: &[f16],
    src_stride: usize,
    dst: &mut [f16],
    filter: &[f32],
    bounds: &FilterBounds,
    blend_length: usize,
) {
    unsafe {
        let mut store_0 = vdupq_n_f16(0.);

        let px = start_x;

        for j in 0..bounds.size {
            let py = start_y + j;
            let weight = filter.get_unchecked(j..);
            let v_weight_h = vcvt_f16_f32(vld1q_dup_f32(weight.as_ptr()));
            let v_weight = vcombine_f16(v_weight_h, v_weight_h);
            let src_ptr = src.get_unchecked(src_stride * py..).as_ptr();

            let s_ptr = src_ptr.add(px);
            let item_row = if USE_BLENDING {
                let mut transient: [f16; 8] = [0.; 8];
                std::ptr::copy_nonoverlapping(s_ptr, transient.as_mut_ptr(), blend_length);
                vld1q_f16(transient.as_ptr())
            } else {
                vld1q_f16(s_ptr)
            };

            store_0 = vfmaq_f16(store_0, item_row, v_weight);
        }

        let dst_ptr = dst.get_unchecked_mut(px..).as_mut_ptr();
        if USE_BLENDING {
            let mut transient: [f16; 8] = [0.; 8];
            vst1q_f16(transient.as_mut_ptr(), store_0);
            std::ptr::copy_nonoverlapping(transient.as_ptr(), dst_ptr, blend_length);
        } else {
            vst1q_f16(dst_ptr, store_0);
        }
    }
}

macro_rules! conv_vertical_part_neon_16_f16 {
    ($start_y: expr, $start_x: expr, $src: expr, $src_stride: expr, $dst: expr, $filter: expr, $bounds: expr) => {{
        unsafe {
            let mut store_0 = vdupq_n_f16(0.);
            let mut store_1 = vdupq_n_f16(0.);

            let px = $start_x;

            for j in 0..$bounds.size {
                let py = $start_y + j;
                let v_weight_h = vcvt_f16_f32(vld1q_dup_f32($filter.get_unchecked(j..).as_ptr()));
                let v_weight = vcombine_f16(v_weight_h, v_weight_h);
                let src_ptr = $src.get_unchecked($src_stride * py..).as_ptr();

                let s_ptr = src_ptr.add(px);
                let item_row = xvld1q_u16_x2(s_ptr as *const _);

                store_0 = vfmaq_f16(store_0, vreinterpretq_f16_u16(item_row.0), v_weight);
                store_1 = vfmaq_f16(store_1, vreinterpretq_f16_u16(item_row.1), v_weight);
            }

            let dst_ptr = $dst.get_unchecked_mut(px..).as_mut_ptr();
            let f_set = float16x8x2_t(store_0, store_1);
            vst1q_f16(dst_ptr, f_set.0);
            vst1q_f16(dst_ptr.add(8), f_set.1);
        }
    }};
}

macro_rules! conv_vertical_part_neon_32_f16 {
    ($start_y: expr, $start_x: expr, $src: expr, $src_stride: expr, $dst: expr, $filter: expr, $bounds: expr) => {{
        unsafe {
            let mut store_0 = vdupq_n_f16(0.);
            let mut store_1 = vdupq_n_f16(0.);
            let mut store_2 = vdupq_n_f16(0.);
            let mut store_3 = vdupq_n_f16(0.);

            let px = $start_x;

            for j in 0..$bounds.size {
                let py = $start_y + j;
                let v_weight_h = vcvt_f16_f32(vld1q_dup_f32($filter.get_unchecked(j..).as_ptr()));
                let v_weight = vcombine_f16(v_weight_h, v_weight_h);
                let src_ptr = $src.get_unchecked($src_stride * py..).as_ptr();

                let s_ptr = src_ptr.add(px);
                let item_row = xvld1q_u16_x4(s_ptr as *const _);

                store_0 = vfmaq_f16(store_0, vreinterpretq_f16_u16(item_row.0), v_weight);
                store_1 = vfmaq_f16(store_1, vreinterpretq_f16_u16(item_row.1), v_weight);
                store_2 = vfmaq_f16(store_2, vreinterpretq_f16_u16(item_row.2), v_weight);
                store_3 = vfmaq_f16(store_3, vreinterpretq_f16_u16(item_row.3), v_weight);
            }

            let dst_ptr = $dst.get_unchecked_mut(px..).as_mut_ptr();
            let f_set = float16x8x4_t(store_0, store_1, store_2, store_3);
            vst1q_f16(dst_ptr, f_set.0);
            vst1q_f16(dst_ptr.add(8), f_set.1);
            vst1q_f16(dst_ptr.add(16), f_set.2);
            vst1q_f16(dst_ptr.add(24), f_set.3);
        }
    }};
}

macro_rules! conv_vertical_part_neon_48_f16 {
    ($start_y: expr, $start_x: expr, $src: expr, $src_stride: expr, $dst: expr, $filter: expr, $bounds: expr) => {{
        unsafe {
            let mut store_0 = vdupq_n_f16(0.);
            let mut store_1 = vdupq_n_f16(0.);
            let mut store_2 = vdupq_n_f16(0.);
            let mut store_3 = vdupq_n_f16(0.);

            let mut store_4 = vdupq_n_f16(0.);
            let mut store_5 = vdupq_n_f16(0.);

            let px = $start_x;

            for j in 0..$bounds.size {
                let py = $start_y + j;
                let v_weight_h = vcvt_f16_f32(vld1q_dup_f32($filter.get_unchecked(j..).as_ptr()));
                let v_weight = vcombine_f16(v_weight_h, v_weight_h);
                let src_ptr = $src.get_unchecked($src_stride * py..).as_ptr();

                let s_ptr = src_ptr.add(px);
                let item_row_0 = xvld1q_u16_x4(s_ptr as *const _);
                let item_row_1 = xvld1q_u16_x2(s_ptr.add(32) as *const _);

                store_0 = vfmaq_f16(store_0, vreinterpretq_f16_u16(item_row_0.0), v_weight);
                store_1 = vfmaq_f16(store_1, vreinterpretq_f16_u16(item_row_0.1), v_weight);
                store_2 = vfmaq_f16(store_2, vreinterpretq_f16_u16(item_row_0.2), v_weight);
                store_3 = vfmaq_f16(store_3, vreinterpretq_f16_u16(item_row_0.3), v_weight);

                store_4 = vfmaq_f16(store_4, vreinterpretq_f16_u16(item_row_1.0), v_weight);
                store_5 = vfmaq_f16(store_5, vreinterpretq_f16_u16(item_row_1.1), v_weight);
            }

            let dst_ptr = $dst.get_unchecked_mut(px..).as_mut_ptr();
            let f_set = float16x8x4_t(store_0, store_1, store_2, store_3);
            vst1q_f16(dst_ptr, f_set.0);
            vst1q_f16(dst_ptr.add(8), f_set.1);
            vst1q_f16(dst_ptr.add(16), f_set.2);
            vst1q_f16(dst_ptr.add(24), f_set.3);
            let dst_ptr2 = dst_ptr.add(32);

            let f_set1 = float16x8x2_t(store_4, store_5);
            vst1q_f16(dst_ptr2, f_set1.0);
            vst1q_f16(dst_ptr2.add(8), f_set1.1);
        }
    }};
}

pub(crate) fn xconvolve_vertical_rgb_neon_row_f16(
    width: usize,
    bounds: &FilterBounds,
    src: &[f16],
    dst: &mut [f16],
    src_stride: usize,
    weight_ptr: &[f32],
    _: u32,
) {
    unsafe {
        xconvolve_vertical_rgb_neon_row_f16_impl(width, bounds, src, dst, src_stride, weight_ptr);
    }
}

#[target_feature(enable = "fp16")]
fn xconvolve_vertical_rgb_neon_row_f16_impl(
    _: usize,
    bounds: &FilterBounds,
    src: &[f16],
    dst: &mut [f16],
    src_stride: usize,
    weight_ptr: &[f32],
) {
    let mut cx = 0usize;
    let dst_width = dst.len();

    while cx + 48 <= dst_width {
        conv_vertical_part_neon_48_f16!(bounds.start, cx, src, src_stride, dst, weight_ptr, bounds);

        cx += 48;
    }

    while cx + 32 <= dst_width {
        conv_vertical_part_neon_32_f16!(bounds.start, cx, src, src_stride, dst, weight_ptr, bounds);

        cx += 32;
    }

    while cx + 16 <= dst_width {
        conv_vertical_part_neon_16_f16!(bounds.start, cx, src, src_stride, dst, weight_ptr, bounds);

        cx += 16;
    }

    while cx + 8 <= dst_width {
        xconvolve_vertical_part_neon_8_f16::<false>(
            bounds.start,
            cx,
            src,
            src_stride,
            dst,
            weight_ptr,
            bounds,
            8,
        );

        cx += 8;
    }

    let left = dst_width - cx;

    if left > 0 {
        xconvolve_vertical_part_neon_8_f16::<true>(
            bounds.start,
            cx,
            src,
            src_stride,
            dst,
            weight_ptr,
            bounds,
            left,
        );
    }
}