zoomvtools 1.1.1

Video motion vector analysis utilities in pure Rust
Documentation 
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#![allow(clippy::undocumented_unsafe_blocks)]
#![allow(unsafe_op_in_unsafe_fn)]

use std::{arch::x86_64::*, num::NonZeroUsize};

#[target_feature(enable = "avx2")]
unsafe fn overlap_u8x8_product(src: *const u8, window: *const u16) -> __m256i {
    let src = _mm_loadl_epi64(src.cast::<__m128i>());
    let src = _mm256_cvtepu8_epi32(src);
    let window = _mm_loadu_si128(window.cast::<__m128i>());
    let window = _mm256_cvtepu16_epi32(window);

    _mm256_srli_epi32(_mm256_mullo_epi32(src, window), 6)
}

#[target_feature(enable = "avx2")]
unsafe fn overlap_u8x16_product(src: *const u8, window: *const u16) -> __m256i {
    let lo = overlap_u8x8_product(src, window);
    let hi = overlap_u8x8_product(src.add(8), window.add(8));
    let packed = _mm256_packus_epi32(lo, hi);

    _mm256_permute4x64_epi64(packed, 0b11_01_10_00)
}

#[target_feature(enable = "avx2")]
// NOTE: Ported from C implementation
pub(super) unsafe fn overlaps_u8<const WIDTH: usize, const HEIGHT: usize>(
    dest: *mut u8,
    dest_stride_bytes: NonZeroUsize,
    src: *const u8,
    src_stride_bytes: NonZeroUsize,
    window: *const u16,
    window_stride: NonZeroUsize,
) {
    let dest_stride = dest_stride_bytes.get();
    let src_stride = src_stride_bytes.get();
    let window_stride = window_stride.get();

    for y in 0..HEIGHT {
        let src_row = src.add(y * src_stride);
        let dest_row = dest.add(y * dest_stride).cast::<u16>();
        let window_row = window.add(y * window_stride);
        let mut x = 0;

        while x + 16 <= WIDTH {
            let product = overlap_u8x16_product(src_row.add(x), window_row.add(x));
            let dest = _mm256_loadu_si256(dest_row.add(x).cast::<__m256i>());
            let dest = _mm256_add_epi16(dest, product);

            _mm256_storeu_si256(dest_row.add(x).cast::<__m256i>(), dest);
            x += 16;
        }

        if x + 8 <= WIDTH {
            let product = overlap_u8x8_product(src_row.add(x), window_row.add(x));
            let product = _mm_packus_epi32(
                _mm256_castsi256_si128(product),
                _mm256_extracti128_si256(product, 1),
            );
            let dest = _mm_loadu_si128(dest_row.add(x).cast::<__m128i>());
            let dest = _mm_add_epi16(dest, product);
            _mm_storeu_si128(dest_row.add(x).cast::<__m128i>(), dest);

            x += 8;
        }

        while x < WIDTH {
            *dest_row.add(x) += ((*src_row.add(x) as u32 * *window_row.add(x) as u32) >> 6) as u16;
            x += 1;
        }
    }
}

#[target_feature(enable = "avx2")]
// NOTE: Custom implementation. No C implementation exists.
pub(super) unsafe fn overlaps_u16<const WIDTH: usize, const HEIGHT: usize>(
    dest: *mut u8,
    dest_stride_bytes: NonZeroUsize,
    src: *const u8,
    src_stride_bytes: NonZeroUsize,
    window: *const u16,
    window_stride: NonZeroUsize,
) {
    let dest_stride = dest_stride_bytes.get();
    let src_stride = src_stride_bytes.get();
    let window_stride = window_stride.get();

    for y in 0..HEIGHT {
        let src_row = src.add(y * src_stride).cast::<u16>();
        let dest_row = dest.add(y * dest_stride).cast::<u32>();
        let window_row = window.add(y * window_stride);
        let mut x = 0;

        while x + 8 <= WIDTH {
            let s16 = _mm_loadu_si128(src_row.add(x).cast::<__m128i>());
            let w16 = _mm_loadu_si128(window_row.add(x).cast::<__m128i>());

            let s32 = _mm256_cvtepu16_epi32(s16);
            let w32 = _mm256_cvtepu16_epi32(w16);
            let prod = _mm256_srli_epi32(_mm256_mullo_epi32(s32, w32), 6);

            let d32 = _mm256_loadu_si256(dest_row.add(x).cast::<__m256i>());
            let acc = _mm256_add_epi32(d32, prod);
            _mm256_storeu_si256(dest_row.add(x).cast::<__m256i>(), acc);

            x += 8;
        }

        while x < WIDTH {
            *dest_row.add(x) += (*src_row.add(x) as u32 * *window_row.add(x) as u32) >> 6;
            x += 1;
        }
    }
}