pic-scale 0.7.8

/*
 * 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 WARRANTIES, 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::FilterWeights;
use crate::sse::{_mm_prefer_fma_ps, load_4_weights, shuffle};
#[cfg(target_arch = "x86")]
use std::arch::x86::*;
#[cfg(target_arch = "x86_64")]
use std::arch::x86_64::*;

#[inline(always)]
fn convolve_horizontal_parts_one_rgba_f32<const FMA: bool>(
    start_x: usize,
    src: &[f32],
    weight0: __m128,
    store_0: __m128,
) -> __m128 {
    unsafe {
        const CN: usize = 4;
        let src_ptr = src.get_unchecked(start_x * CN..).as_ptr();
        let rgb_pixel = _mm_loadu_ps(src_ptr);
        _mm_prefer_fma_ps::<FMA>(store_0, rgb_pixel, weight0)
    }
}

pub(crate) fn convolve_horizontal_rgba_sse_row_one_f32(
    src: &[f32],
    dst: &mut [f32],
    filter_weights: &FilterWeights<f32>,
    _: u32,
) {
    unsafe {
        convolve_horizontal_rgba_sse_row_one_f32_regular(filter_weights, src, dst);
    }
}

#[target_feature(enable = "sse4.1")]
/// This inlining is required to activate all features for runtime dispatch
fn convolve_horizontal_rgba_sse_row_one_f32_regular(
    filter_weights: &FilterWeights<f32>,
    src: &[f32],
    dst: &mut [f32],
) {
    convolve_horizontal_rgba_sse_row_one_f32_impl::<false>(filter_weights, src, dst);
}

#[inline(always)]
fn convolve_horizontal_rgba_sse_row_one_f32_impl<const FMA: bool>(
    filter_weights: &FilterWeights<f32>,
    src: &[f32],
    dst: &mut [f32],
) {
    unsafe {
        const CN: usize = 4;
        let mut filter_offset = 0usize;
        let weights_ptr = filter_weights.weights.as_ptr();

        let dst_width = filter_weights.bounds.len();

        for x in 0..dst_width {
            let bounds = filter_weights.bounds.get_unchecked(x);
            let mut jx = 0usize;
            let mut store = _mm_setzero_ps();

            while jx + 4 <= bounds.size {
                let ptr = weights_ptr.add(jx + filter_offset);
                let (weight0, weight1, weight2, weight3) = load_4_weights!(ptr);
                let filter_start = jx + bounds.start;
                store = convolve_horizontal_parts_4_rgba_f32::<FMA>(
                    filter_start,
                    src,
                    weight0,
                    weight1,
                    weight2,
                    weight3,
                    store,
                );
                jx += 4;
            }

            while jx + 2 <= bounds.size {
                let ptr = weights_ptr.add(jx + filter_offset);
                let weights = _mm_castsi128_ps(_mm_loadu_si64(ptr as *const u8));
                const SHUFFLE_0: i32 = shuffle(0, 0, 0, 0);
                let weight0 =
                    _mm_castsi128_ps(_mm_shuffle_epi32::<SHUFFLE_0>(_mm_castps_si128(weights)));
                const SHUFFLE_1: i32 = shuffle(1, 1, 1, 1);
                let weight1 =
                    _mm_castsi128_ps(_mm_shuffle_epi32::<SHUFFLE_1>(_mm_castps_si128(weights)));
                let filter_start = jx + bounds.start;
                store = convolve_horizontal_parts_2_rgba_f32::<FMA>(
                    filter_start,
                    src,
                    weight0,
                    weight1,
                    store,
                );
                jx += 2
            }

            while jx < bounds.size {
                let ptr = weights_ptr.add(jx + filter_offset);
                let weight0 = _mm_load1_ps(ptr);
                let filter_start = jx + bounds.start;
                store = convolve_horizontal_parts_one_rgba_f32::<FMA>(
                    filter_start,
                    src,
                    weight0,
                    store,
                );
                jx += 1;
            }

            let px = x * CN;
            let dest_ptr = dst.get_unchecked_mut(px..);
            _mm_storeu_ps(dest_ptr.as_mut_ptr(), store);

            filter_offset += filter_weights.aligned_size;
        }
    }
}

#[inline(always)]
fn convolve_horizontal_parts_4_rgba_f32<const FMA: bool>(
    start_x: usize,
    src: &[f32],
    weight0: __m128,
    weight1: __m128,
    weight2: __m128,
    weight3: __m128,
    store_0: __m128,
) -> __m128 {
    unsafe {
        const CN: usize = 4;
        let src_ptr = src.get_unchecked(start_x * CN..).as_ptr();

        let rgb_pixel_0 = _mm_loadu_ps(src_ptr);
        let rgb_pixel_1 = _mm_loadu_ps(src_ptr.add(4));
        let rgb_pixel_2 = _mm_loadu_ps(src_ptr.add(8));
        let rgb_pixel_3 = _mm_loadu_ps(src_ptr.add(12));

        let acc = _mm_prefer_fma_ps::<FMA>(store_0, rgb_pixel_0, weight0);
        let acc = _mm_prefer_fma_ps::<FMA>(acc, rgb_pixel_1, weight1);
        let acc = _mm_prefer_fma_ps::<FMA>(acc, rgb_pixel_2, weight2);
        _mm_prefer_fma_ps::<FMA>(acc, rgb_pixel_3, weight3)
    }
}

#[inline(always)]
fn convolve_horizontal_parts_2_rgba_f32<const FMA: bool>(
    start_x: usize,
    src: &[f32],
    weight0: __m128,
    weight1: __m128,
    store_0: __m128,
) -> __m128 {
    unsafe {
        const CN: usize = 4;
        let src_ptr = src.get_unchecked(start_x * CN..).as_ptr();

        let rgb_pixel_0 = _mm_loadu_ps(src_ptr);
        let rgb_pixel_1 = _mm_loadu_ps(src_ptr.add(4));

        let acc = _mm_prefer_fma_ps::<FMA>(store_0, rgb_pixel_0, weight0);
        _mm_prefer_fma_ps::<FMA>(acc, rgb_pixel_1, weight1)
    }
}

pub(crate) fn convolve_horizontal_rgba_sse_rows_4_f32(
    src: &[f32],
    src_stride: usize,
    dst: &mut [f32],
    dst_stride: usize,
    filter_weights: &FilterWeights<f32>,
    _: u32,
) {
    unsafe {
        convolve_horizontal_rgba_sse_rows_4_f32_regular(
            filter_weights,
            src,
            src_stride,
            dst,
            dst_stride,
        );
    }
}

#[target_feature(enable = "sse4.1")]
/// This inlining is required to activate all features for runtime dispatch
fn convolve_horizontal_rgba_sse_rows_4_f32_regular(
    filter_weights: &FilterWeights<f32>,
    src: &[f32],
    src_stride: usize,
    dst: &mut [f32],
    dst_stride: usize,
) {
    convolve_horizontal_rgba_sse_rows_4_f32_impl::<false>(
        filter_weights,
        src,
        src_stride,
        dst,
        dst_stride,
    );
}

#[inline(always)]
fn convolve_horizontal_rgba_sse_rows_4_f32_impl<const FMA: bool>(
    filter_weights: &FilterWeights<f32>,
    src: &[f32],
    src_stride: usize,
    dst: &mut [f32],
    dst_stride: usize,
) {
    unsafe {
        const CN: usize = 4;
        let mut filter_offset = 0usize;
        let zeros = _mm_setzero_ps();
        let weights_ptr = filter_weights.weights.as_ptr();

        let dst_width = filter_weights.bounds.len();

        for x in 0..dst_width {
            let bounds = filter_weights.bounds.get_unchecked(x);
            let mut jx = 0usize;
            let mut store_0 = zeros;
            let mut store_1 = zeros;
            let mut store_2 = zeros;
            let mut store_3 = zeros;

            while jx + 4 <= bounds.size {
                let ptr = weights_ptr.add(jx + filter_offset);
                let (weight0, weight1, weight2, weight3) = load_4_weights!(ptr);
                let filter_start = jx + bounds.start;

                store_0 = convolve_horizontal_parts_4_rgba_f32::<FMA>(
                    filter_start,
                    src,
                    weight0,
                    weight1,
                    weight2,
                    weight3,
                    store_0,
                );
                store_1 = convolve_horizontal_parts_4_rgba_f32::<FMA>(
                    filter_start,
                    src.get_unchecked(src_stride..),
                    weight0,
                    weight1,
                    weight2,
                    weight3,
                    store_1,
                );
                store_2 = convolve_horizontal_parts_4_rgba_f32::<FMA>(
                    filter_start,
                    src.get_unchecked(src_stride * 2..),
                    weight0,
                    weight1,
                    weight2,
                    weight3,
                    store_2,
                );
                store_3 = convolve_horizontal_parts_4_rgba_f32::<FMA>(
                    filter_start,
                    src.get_unchecked(src_stride * 3..),
                    weight0,
                    weight1,
                    weight2,
                    weight3,
                    store_3,
                );
                jx += 4;
            }

            while jx + 2 <= bounds.size {
                let ptr = weights_ptr.add(jx + filter_offset);
                let weights = _mm_castsi128_ps(_mm_loadu_si64(ptr as *const u8));
                const SHUFFLE_0: i32 = shuffle(0, 0, 0, 0);
                let weight0 =
                    _mm_castsi128_ps(_mm_shuffle_epi32::<SHUFFLE_0>(_mm_castps_si128(weights)));
                const SHUFFLE_1: i32 = shuffle(1, 1, 1, 1);
                let weight1 =
                    _mm_castsi128_ps(_mm_shuffle_epi32::<SHUFFLE_1>(_mm_castps_si128(weights)));
                let filter_start = jx + bounds.start;
                store_0 = convolve_horizontal_parts_2_rgba_f32::<FMA>(
                    filter_start,
                    src,
                    weight0,
                    weight1,
                    store_0,
                );
                store_1 = convolve_horizontal_parts_2_rgba_f32::<FMA>(
                    filter_start,
                    src.get_unchecked(src_stride..),
                    weight0,
                    weight1,
                    store_1,
                );
                store_2 = convolve_horizontal_parts_2_rgba_f32::<FMA>(
                    filter_start,
                    src.get_unchecked(src_stride * 2..),
                    weight0,
                    weight1,
                    store_2,
                );
                store_3 = convolve_horizontal_parts_2_rgba_f32::<FMA>(
                    filter_start,
                    src.get_unchecked(src_stride * 3..),
                    weight0,
                    weight1,
                    store_3,
                );
                jx += 2;
            }

            while jx < bounds.size {
                let ptr = weights_ptr.add(jx + filter_offset);
                let filter_start = jx + bounds.start;
                let weight0 = _mm_load1_ps(ptr);
                store_0 = convolve_horizontal_parts_one_rgba_f32::<FMA>(
                    filter_start,
                    src,
                    weight0,
                    store_0,
                );
                store_1 = convolve_horizontal_parts_one_rgba_f32::<FMA>(
                    filter_start,
                    src.get_unchecked(src_stride..),
                    weight0,
                    store_1,
                );
                store_2 = convolve_horizontal_parts_one_rgba_f32::<FMA>(
                    filter_start,
                    src.get_unchecked(src_stride * 2..),
                    weight0,
                    store_2,
                );
                store_3 = convolve_horizontal_parts_one_rgba_f32::<FMA>(
                    filter_start,
                    src.get_unchecked(src_stride * 3..),
                    weight0,
                    store_3,
                );
                jx += 1;
            }

            let px = x * CN;
            let dest_ptr = dst.get_unchecked_mut(px..);
            _mm_storeu_ps(dest_ptr.as_mut_ptr(), store_0);

            let dest_ptr = dst.get_unchecked_mut(px + dst_stride..);
            _mm_storeu_ps(dest_ptr.as_mut_ptr(), store_1);

            let dest_ptr = dst.get_unchecked_mut(px + dst_stride * 2..);
            _mm_storeu_ps(dest_ptr.as_mut_ptr(), store_2);

            let dest_ptr = dst.get_unchecked_mut(px + dst_stride * 3..);
            _mm_storeu_ps(dest_ptr.as_mut_ptr(), store_3);

            filter_offset += filter_weights.aligned_size;
        }
    }
}