/*
 * Copyright(c) 2019 Intel Corporation
 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at https://www.aomedia.org/license/software-license. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at https://www.aomedia.org/license/patent-license.
 */

#include <assert.h>
#include <smmintrin.h>
#include "EbDefinitions.h"
#include "EbBlend_sse4.h"
#include "common_dsp_rtcd.h"

//////////////////////////////////////////////////////////////////////////////
// No sub-sampling
//////////////////////////////////////////////////////////////////////////////

static void blend_a64_mask_w4_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                     uint32_t src0_stride, const uint8_t *src1,
                                     uint32_t src1_stride, const uint8_t *mask,
                                     uint32_t mask_stride, int w, int h) {
    (void)w;
    const __m128i v_maxval_b = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r         = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));
    do {
        const __m128i v_m0_b  = xx_loadl_32(mask);
        const __m128i v_m1_b  = _mm_sub_epi8(v_maxval_b, v_m0_b);
        const __m128i v_res_b = blend_4_u8(src0, src1, &v_m0_b, &v_m1_b, &_r);
        xx_storel_32(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

static void blend_a64_mask_w8_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                     uint32_t src0_stride, const uint8_t *src1,
                                     uint32_t src1_stride, const uint8_t *mask,
                                     uint32_t mask_stride, int w, int h) {
    (void)w;
    const __m128i v_maxval_b = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r         = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));
    do {
        const __m128i v_m0_b  = xx_loadl_64(mask);
        const __m128i v_m1_b  = _mm_sub_epi8(v_maxval_b, v_m0_b);
        const __m128i v_res_b = blend_8_u8(src0, src1, &v_m0_b, &v_m1_b, &_r);
        xx_storel_64(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

static void blend_a64_mask_w16n_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                       uint32_t src0_stride, const uint8_t *src1,
                                       uint32_t src1_stride, const uint8_t *mask,
                                       uint32_t mask_stride, int w, int h) {
    const __m128i v_maxval_b = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r         = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));

    do {
        int c;
        for (c = 0; c < w; c += 16) {
            const __m128i v_m0_b = xx_loadu_128(mask + c);
            const __m128i v_m1_b = _mm_sub_epi8(v_maxval_b, v_m0_b);

            const __m128i v_res_b = blend_16_u8(src0 + c, src1 + c, &v_m0_b, &v_m1_b, &_r);

            xx_storeu_128(dst + c, v_res_b);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

//////////////////////////////////////////////////////////////////////////////
// Horizontal sub-sampling
//////////////////////////////////////////////////////////////////////////////

static void blend_a64_mask_sx_w4_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                        uint32_t src0_stride, const uint8_t *src1,
                                        uint32_t src1_stride, const uint8_t *mask,
                                        uint32_t mask_stride, int w, int h) {
    (void)w;

    const __m128i v_shuffle_b = xx_loadu_128(g_blend_a64_mask_shuffle);
    const __m128i v_maxval_b  = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r          = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));
    do {
        const __m128i v_r_b    = xx_loadl_64(mask);
        const __m128i v_r0_s_b = _mm_shuffle_epi8(v_r_b, v_shuffle_b);
        const __m128i v_r_lo_b = _mm_unpacklo_epi64(v_r0_s_b, v_r0_s_b);
        const __m128i v_r_hi_b = _mm_unpackhi_epi64(v_r0_s_b, v_r0_s_b);
        const __m128i v_m0_b   = _mm_avg_epu8(v_r_lo_b, v_r_hi_b);
        const __m128i v_m1_b   = _mm_sub_epi8(v_maxval_b, v_m0_b);

        const __m128i v_res_b = blend_4_u8(src0, src1, &v_m0_b, &v_m1_b, &_r);
        xx_storel_32(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

static void blend_a64_mask_sx_w8_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                        uint32_t src0_stride, const uint8_t *src1,
                                        uint32_t src1_stride, const uint8_t *mask,
                                        uint32_t mask_stride, int w, int h) {
    (void)w;

    const __m128i v_shuffle_b = xx_loadu_128(g_blend_a64_mask_shuffle);
    const __m128i v_maxval_b  = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r          = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));
    do {
        const __m128i v_r_b    = xx_loadu_128(mask);
        const __m128i v_r0_s_b = _mm_shuffle_epi8(v_r_b, v_shuffle_b);
        const __m128i v_r_lo_b = _mm_unpacklo_epi64(v_r0_s_b, v_r0_s_b);
        const __m128i v_r_hi_b = _mm_unpackhi_epi64(v_r0_s_b, v_r0_s_b);
        const __m128i v_m0_b   = _mm_avg_epu8(v_r_lo_b, v_r_hi_b);
        const __m128i v_m1_b   = _mm_sub_epi8(v_maxval_b, v_m0_b);

        const __m128i v_res_b = blend_8_u8(src0, src1, &v_m0_b, &v_m1_b, &_r);

        xx_storel_64(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

static void blend_a64_mask_sx_w16n_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                          uint32_t src0_stride, const uint8_t *src1,
                                          uint32_t src1_stride, const uint8_t *mask,
                                          uint32_t mask_stride, int w, int h) {
    const __m128i v_shuffle_b = xx_loadu_128(g_blend_a64_mask_shuffle);
    const __m128i v_maxval_b  = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r          = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));

    do {
        int c;
        for (c = 0; c < w; c += 16) {
            const __m128i v_r0_b   = xx_loadu_128(mask + 2 * c);
            const __m128i v_r1_b   = xx_loadu_128(mask + 2 * c + 16);
            const __m128i v_r0_s_b = _mm_shuffle_epi8(v_r0_b, v_shuffle_b);
            const __m128i v_r1_s_b = _mm_shuffle_epi8(v_r1_b, v_shuffle_b);
            const __m128i v_r_lo_b = _mm_unpacklo_epi64(v_r0_s_b, v_r1_s_b);
            const __m128i v_r_hi_b = _mm_unpackhi_epi64(v_r0_s_b, v_r1_s_b);
            const __m128i v_m0_b   = _mm_avg_epu8(v_r_lo_b, v_r_hi_b);
            const __m128i v_m1_b   = _mm_sub_epi8(v_maxval_b, v_m0_b);

            const __m128i v_res_b = blend_16_u8(src0 + c, src1 + c, &v_m0_b, &v_m1_b, &_r);

            xx_storeu_128(dst + c, v_res_b);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

//////////////////////////////////////////////////////////////////////////////
// Vertical sub-sampling
//////////////////////////////////////////////////////////////////////////////

static void blend_a64_mask_sy_w4_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                        uint32_t src0_stride, const uint8_t *src1,
                                        uint32_t src1_stride, const uint8_t *mask,
                                        uint32_t mask_stride, int w, int h) {
    (void)w;

    const __m128i v_maxval_b = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r         = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));

    do {
        const __m128i v_ra_b = xx_loadl_32(mask);
        const __m128i v_rb_b = xx_loadl_32(mask + mask_stride);
        const __m128i v_m0_b = _mm_avg_epu8(v_ra_b, v_rb_b);
        const __m128i v_m1_b = _mm_sub_epi8(v_maxval_b, v_m0_b);

        const __m128i v_res_b = blend_4_u8(src0, src1, &v_m0_b, &v_m1_b, &_r);

        xx_storel_32(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

static void blend_a64_mask_sy_w8_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                        uint32_t src0_stride, const uint8_t *src1,
                                        uint32_t src1_stride, const uint8_t *mask,
                                        uint32_t mask_stride, int w, int h) {
    (void)w;

    const __m128i v_maxval_b = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r         = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));
    do {
        const __m128i v_ra_b  = xx_loadl_64(mask);
        const __m128i v_rb_b  = xx_loadl_64(mask + mask_stride);
        const __m128i v_m0_b  = _mm_avg_epu8(v_ra_b, v_rb_b);
        const __m128i v_m1_b  = _mm_sub_epi8(v_maxval_b, v_m0_b);
        const __m128i v_res_b = blend_8_u8(src0, src1, &v_m0_b, &v_m1_b, &_r);

        xx_storel_64(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

static void blend_a64_mask_sy_w16n_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                          uint32_t src0_stride, const uint8_t *src1,
                                          uint32_t src1_stride, const uint8_t *mask,
                                          uint32_t mask_stride, int w, int h) {
    const __m128i v_maxval_b = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r         = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));
    do {
        int c;
        for (c = 0; c < w; c += 16) {
            const __m128i v_ra_b = xx_loadu_128(mask + c);
            const __m128i v_rb_b = xx_loadu_128(mask + c + mask_stride);
            const __m128i v_m0_b = _mm_avg_epu8(v_ra_b, v_rb_b);
            const __m128i v_m1_b = _mm_sub_epi8(v_maxval_b, v_m0_b);

            const __m128i v_res_b = blend_16_u8(src0 + c, src1 + c, &v_m0_b, &v_m1_b, &_r);

            xx_storeu_128(dst + c, v_res_b);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

//////////////////////////////////////////////////////////////////////////////
// Horizontal and Vertical sub-sampling
//////////////////////////////////////////////////////////////////////////////

static void blend_a64_mask_sx_sy_w4_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                           uint32_t src0_stride, const uint8_t *src1,
                                           uint32_t src1_stride, const uint8_t *mask,
                                           uint32_t mask_stride, int w, int h) {
    const __m128i v_shuffle_b = xx_loadu_128(g_blend_a64_mask_shuffle);
    const __m128i v_maxval_b  = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r          = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));
    (void)w;

    do {
        const __m128i v_ra_b   = xx_loadl_64(mask);
        const __m128i v_rb_b   = xx_loadl_64(mask + mask_stride);
        const __m128i v_rvs_b  = _mm_add_epi8(v_ra_b, v_rb_b);
        const __m128i v_r_s_b  = _mm_shuffle_epi8(v_rvs_b, v_shuffle_b);
        const __m128i v_r0_s_w = _mm_cvtepu8_epi16(v_r_s_b);
        const __m128i v_r1_s_w = _mm_cvtepu8_epi16(_mm_srli_si128(v_r_s_b, 8));
        const __m128i v_rs_w   = _mm_add_epi16(v_r0_s_w, v_r1_s_w);
        const __m128i v_m0_w   = xx_roundn_epu16(v_rs_w, 2);
        const __m128i v_m0_b   = _mm_packus_epi16(v_m0_w, v_m0_w);
        const __m128i v_m1_b   = _mm_sub_epi8(v_maxval_b, v_m0_b);

        const __m128i v_res_b = blend_4_u8(src0, src1, &v_m0_b, &v_m1_b, &_r);

        xx_storel_32(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

static void blend_a64_mask_sx_sy_w8_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                           uint32_t src0_stride, const uint8_t *src1,
                                           uint32_t src1_stride, const uint8_t *mask,
                                           uint32_t mask_stride, int w, int h) {
    const __m128i v_shuffle_b = xx_loadu_128(g_blend_a64_mask_shuffle);
    const __m128i v_maxval_b  = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r          = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));
    (void)w;

    do {
        const __m128i v_ra_b = xx_loadu_128(mask);
        const __m128i v_rb_b = xx_loadu_128(mask + mask_stride);

        const __m128i v_rvs_b  = _mm_add_epi8(v_ra_b, v_rb_b);
        const __m128i v_r_s_b  = _mm_shuffle_epi8(v_rvs_b, v_shuffle_b);
        const __m128i v_r0_s_w = _mm_cvtepu8_epi16(v_r_s_b);
        const __m128i v_r1_s_w = _mm_cvtepu8_epi16(_mm_srli_si128(v_r_s_b, 8));
        const __m128i v_rs_w   = _mm_add_epi16(v_r0_s_w, v_r1_s_w);
        const __m128i v_m0_w   = xx_roundn_epu16(v_rs_w, 2);
        const __m128i v_m0_b   = _mm_packus_epi16(v_m0_w, v_m0_w);
        const __m128i v_m1_b   = _mm_sub_epi8(v_maxval_b, v_m0_b);

        const __m128i v_res_b = blend_8_u8(src0, src1, &v_m0_b, &v_m1_b, &_r);

        xx_storel_64(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

static void blend_a64_mask_sx_sy_w16n_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                             uint32_t src0_stride, const uint8_t *src1,
                                             uint32_t src1_stride, const uint8_t *mask,
                                             uint32_t mask_stride, int w, int h) {
    const __m128i v_zmask_b = _mm_set_epi8(
        0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff);
    const __m128i v_maxval_b = _mm_set1_epi8(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i _r         = _mm_set1_epi16(1 << (15 - AOM_BLEND_A64_ROUND_BITS));
    do {
        int c;
        for (c = 0; c < w; c += 16) {
            const __m128i v_ral_b   = xx_loadu_128(mask + 2 * c);
            const __m128i v_rah_b   = xx_loadu_128(mask + 2 * c + 16);
            const __m128i v_rbl_b   = xx_loadu_128(mask + mask_stride + 2 * c);
            const __m128i v_rbh_b   = xx_loadu_128(mask + mask_stride + 2 * c + 16);
            const __m128i v_rvsl_b  = _mm_add_epi8(v_ral_b, v_rbl_b);
            const __m128i v_rvsh_b  = _mm_add_epi8(v_rah_b, v_rbh_b);
            const __m128i v_rvsal_w = _mm_and_si128(v_rvsl_b, v_zmask_b);
            const __m128i v_rvsah_w = _mm_and_si128(v_rvsh_b, v_zmask_b);
            const __m128i v_rvsbl_w = _mm_and_si128(_mm_srli_si128(v_rvsl_b, 1), v_zmask_b);
            const __m128i v_rvsbh_w = _mm_and_si128(_mm_srli_si128(v_rvsh_b, 1), v_zmask_b);
            const __m128i v_rsl_w   = _mm_add_epi16(v_rvsal_w, v_rvsbl_w);
            const __m128i v_rsh_w   = _mm_add_epi16(v_rvsah_w, v_rvsbh_w);

            const __m128i v_m0l_w = xx_roundn_epu16(v_rsl_w, 2);
            const __m128i v_m0h_w = xx_roundn_epu16(v_rsh_w, 2);
            const __m128i v_m0_b  = _mm_packus_epi16(v_m0l_w, v_m0h_w);
            const __m128i v_m1_b  = _mm_sub_epi8(v_maxval_b, v_m0_b);

            const __m128i v_res_b = blend_16_u8(src0 + c, src1 + c, &v_m0_b, &v_m1_b, &_r);

            xx_storeu_128(dst + c, v_res_b);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

//////////////////////////////////////////////////////////////////////////////
// Dispatch
//////////////////////////////////////////////////////////////////////////////

void svt_aom_blend_a64_mask_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                   uint32_t src0_stride, const uint8_t *src1, uint32_t src1_stride,
                                   const uint8_t *mask, uint32_t mask_stride, int w, int h,
                                   int subx, int suby) {
    typedef void (*BlendFn)(uint8_t * dst,
                            uint32_t       dst_stride,
                            const uint8_t *src0,
                            uint32_t       src0_stride,
                            const uint8_t *src1,
                            uint32_t       src1_stride,
                            const uint8_t *mask,
                            uint32_t       mask_stride,
                            int            w,
                            int            h);
    assert(IMPLIES(src0 == dst, src0_stride == dst_stride));
    assert(IMPLIES(src1 == dst, src1_stride == dst_stride));

    assert(h >= 1);
    assert(w >= 1);
    assert(IS_POWER_OF_TWO(h));
    assert(IS_POWER_OF_TWO(w));

    if (EB_UNLIKELY((h | w) & 3)) { // if (w <= 2 || h <= 2)
        svt_aom_blend_a64_mask_c(dst,
                                 dst_stride,
                                 src0,
                                 src0_stride,
                                 src1,
                                 src1_stride,
                                 mask,
                                 mask_stride,
                                 w,
                                 h,
                                 subx,
                                 suby);
    } else {
        // Dimensions are: width_index X subx X suby
        static const BlendFn blend[3][2][2] = {
            {// w % 16 == 0
             {blend_a64_mask_w16n_sse4_1, blend_a64_mask_sy_w16n_sse4_1},
             {blend_a64_mask_sx_w16n_sse4_1, blend_a64_mask_sx_sy_w16n_sse4_1}},
            {// w == 4
             {blend_a64_mask_w4_sse4_1, blend_a64_mask_sy_w4_sse4_1},
             {blend_a64_mask_sx_w4_sse4_1, blend_a64_mask_sx_sy_w4_sse4_1}},
            {// w == 8
             {blend_a64_mask_w8_sse4_1, blend_a64_mask_sy_w8_sse4_1},
             {blend_a64_mask_sx_w8_sse4_1, blend_a64_mask_sx_sy_w8_sse4_1}}};
        assert(((w >> 2) & 3) < 3);
        blend[(w >> 2) & 3][subx != 0][suby != 0](
            dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, w, h);
    }
}

//////////////////////////////////////////////////////////////////////////////
// No sub-sampling
//////////////////////////////////////////////////////////////////////////////

static INLINE void blend_a64_mask_bn_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                               const uint16_t *src0, uint32_t src0_stride,
                                               const uint16_t *src1, uint32_t src1_stride,
                                               const uint8_t *mask, uint32_t mask_stride, int h,
                                               BlendUnitFn blend) {
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        const __m128i v_m0_b = xx_loadl_32(mask);
        const __m128i v_m0_w = _mm_cvtepu8_epi16(v_m0_b);
        const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

        const __m128i v_res_w = blend(src0, src1, v_m0_w, v_m1_w);

        xx_storel_64(dst, v_res_w);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

static void blend_a64_mask_b10_w4_sse4_1(uint16_t *dst, uint32_t dst_stride, const uint16_t *src0,
                                         uint32_t src0_stride, const uint16_t *src1,
                                         uint32_t src1_stride, const uint8_t *mask,
                                         uint32_t mask_stride, int w, int h) {
    (void)w;
    blend_a64_mask_bn_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, h, blend_4_b10);
}

static void blend_a64_mask_b12_w4_sse4_1(uint16_t *dst, uint32_t dst_stride, const uint16_t *src0,
                                         uint32_t src0_stride, const uint16_t *src1,
                                         uint32_t src1_stride, const uint8_t *mask,
                                         uint32_t mask_stride, int w, int h) {
    (void)w;
    blend_a64_mask_bn_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, h, blend_4_b12);
}

static INLINE void blend_a64_mask_bn_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                const uint16_t *src0, uint32_t src0_stride,
                                                const uint16_t *src1, uint32_t src1_stride,
                                                const uint8_t *mask, uint32_t mask_stride, int w,
                                                int h, BlendUnitFn blend) {
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        int c;
        for (c = 0; c < w; c += 8) {
            const __m128i v_m0_b = xx_loadl_64(mask + c);
            const __m128i v_m0_w = _mm_cvtepu8_epi16(v_m0_b);
            const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

            const __m128i v_res_w = blend(src0 + c, src1 + c, v_m0_w, v_m1_w);

            xx_storeu_128(dst + c, v_res_w);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

static void blend_a64_mask_b10_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride, const uint16_t *src0,
                                          uint32_t src0_stride, const uint16_t *src1,
                                          uint32_t src1_stride, const uint8_t *mask,
                                          uint32_t mask_stride, int w, int h) {
    blend_a64_mask_bn_w8n_sse4_1(dst,
                                 dst_stride,
                                 src0,
                                 src0_stride,
                                 src1,
                                 src1_stride,
                                 mask,
                                 mask_stride,
                                 w,
                                 h,
                                 blend_8_b10);
}

static void blend_a64_mask_b12_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride, const uint16_t *src0,
                                          uint32_t src0_stride, const uint16_t *src1,
                                          uint32_t src1_stride, const uint8_t *mask,
                                          uint32_t mask_stride, int w, int h) {
    blend_a64_mask_bn_w8n_sse4_1(dst,
                                 dst_stride,
                                 src0,
                                 src0_stride,
                                 src1,
                                 src1_stride,
                                 mask,
                                 mask_stride,
                                 w,
                                 h,
                                 blend_8_b12);
}

//////////////////////////////////////////////////////////////////////////////
// Horizontal sub-sampling
//////////////////////////////////////////////////////////////////////////////

static INLINE void blend_a64_mask_bn_sx_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                  const uint16_t *src0, uint32_t src0_stride,
                                                  const uint16_t *src1, uint32_t src1_stride,
                                                  const uint8_t *mask, uint32_t mask_stride, int h,
                                                  BlendUnitFn blend) {
    const __m128i v_zmask_b = _mm_set_epi8(
        0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff);
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        const __m128i v_r_b = xx_loadl_64(mask);
        const __m128i v_a_b = _mm_avg_epu8(v_r_b, _mm_srli_si128(v_r_b, 1));

        const __m128i v_m0_w = _mm_and_si128(v_a_b, v_zmask_b);
        const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

        const __m128i v_res_w = blend(src0, src1, v_m0_w, v_m1_w);

        xx_storel_64(dst, v_res_w);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

static void blend_a64_mask_b10_sx_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                            const uint16_t *src0, uint32_t src0_stride,
                                            const uint16_t *src1, uint32_t src1_stride,
                                            const uint8_t *mask, uint32_t mask_stride, int w,
                                            int h) {
    (void)w;
    blend_a64_mask_bn_sx_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, h, blend_4_b10);
}

static void blend_a64_mask_b12_sx_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                            const uint16_t *src0, uint32_t src0_stride,
                                            const uint16_t *src1, uint32_t src1_stride,
                                            const uint8_t *mask, uint32_t mask_stride, int w,
                                            int h) {
    (void)w;
    blend_a64_mask_bn_sx_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, h, blend_4_b12);
}

static INLINE void blend_a64_mask_bn_sx_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                   const uint16_t *src0, uint32_t src0_stride,
                                                   const uint16_t *src1, uint32_t src1_stride,
                                                   const uint8_t *mask, uint32_t mask_stride, int w,
                                                   int h, BlendUnitFn blend) {
    const __m128i v_zmask_b = _mm_set_epi8(
        0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff);
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        int c;
        for (c = 0; c < w; c += 8) {
            const __m128i v_r_b = xx_loadu_128(mask + 2 * c);
            const __m128i v_a_b = _mm_avg_epu8(v_r_b, _mm_srli_si128(v_r_b, 1));

            const __m128i v_m0_w = _mm_and_si128(v_a_b, v_zmask_b);
            const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

            const __m128i v_res_w = blend(src0 + c, src1 + c, v_m0_w, v_m1_w);

            xx_storeu_128(dst + c, v_res_w);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    } while (--h);
}

static void blend_a64_mask_b10_sx_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                             const uint16_t *src0, uint32_t src0_stride,
                                             const uint16_t *src1, uint32_t src1_stride,
                                             const uint8_t *mask, uint32_t mask_stride, int w,
                                             int h) {
    blend_a64_mask_bn_sx_w8n_sse4_1(dst,
                                    dst_stride,
                                    src0,
                                    src0_stride,
                                    src1,
                                    src1_stride,
                                    mask,
                                    mask_stride,
                                    w,
                                    h,
                                    blend_8_b10);
}

static void blend_a64_mask_b12_sx_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                             const uint16_t *src0, uint32_t src0_stride,
                                             const uint16_t *src1, uint32_t src1_stride,
                                             const uint8_t *mask, uint32_t mask_stride, int w,
                                             int h) {
    blend_a64_mask_bn_sx_w8n_sse4_1(dst,
                                    dst_stride,
                                    src0,
                                    src0_stride,
                                    src1,
                                    src1_stride,
                                    mask,
                                    mask_stride,
                                    w,
                                    h,
                                    blend_8_b12);
}

//////////////////////////////////////////////////////////////////////////////
// Vertical sub-sampling
//////////////////////////////////////////////////////////////////////////////

static INLINE void blend_a64_mask_bn_sy_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                  const uint16_t *src0, uint32_t src0_stride,
                                                  const uint16_t *src1, uint32_t src1_stride,
                                                  const uint8_t *mask, uint32_t mask_stride, int h,
                                                  BlendUnitFn blend) {
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        const __m128i v_ra_b = xx_loadl_32(mask);
        const __m128i v_rb_b = xx_loadl_32(mask + mask_stride);
        const __m128i v_a_b  = _mm_avg_epu8(v_ra_b, v_rb_b);

        const __m128i v_m0_w = _mm_cvtepu8_epi16(v_a_b);
        const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

        const __m128i v_res_w = blend(src0, src1, v_m0_w, v_m1_w);

        xx_storel_64(dst, v_res_w);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

static void blend_a64_mask_b10_sy_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                            const uint16_t *src0, uint32_t src0_stride,
                                            const uint16_t *src1, uint32_t src1_stride,
                                            const uint8_t *mask, uint32_t mask_stride, int w,
                                            int h) {
    (void)w;
    blend_a64_mask_bn_sy_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, h, blend_4_b10);
}

static void blend_a64_mask_b12_sy_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                            const uint16_t *src0, uint32_t src0_stride,
                                            const uint16_t *src1, uint32_t src1_stride,
                                            const uint8_t *mask, uint32_t mask_stride, int w,
                                            int h) {
    (void)w;
    blend_a64_mask_bn_sy_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, h, blend_4_b12);
}

static INLINE void blend_a64_mask_bn_sy_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                   const uint16_t *src0, uint32_t src0_stride,
                                                   const uint16_t *src1, uint32_t src1_stride,
                                                   const uint8_t *mask, uint32_t mask_stride, int w,
                                                   int h, BlendUnitFn blend) {
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        int c;
        for (c = 0; c < w; c += 8) {
            const __m128i v_ra_b = xx_loadl_64(mask + c);
            const __m128i v_rb_b = xx_loadl_64(mask + c + mask_stride);
            const __m128i v_a_b  = _mm_avg_epu8(v_ra_b, v_rb_b);

            const __m128i v_m0_w = _mm_cvtepu8_epi16(v_a_b);
            const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

            const __m128i v_res_w = blend(src0 + c, src1 + c, v_m0_w, v_m1_w);

            xx_storeu_128(dst + c, v_res_w);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

static void blend_a64_mask_b10_sy_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                             const uint16_t *src0, uint32_t src0_stride,
                                             const uint16_t *src1, uint32_t src1_stride,
                                             const uint8_t *mask, uint32_t mask_stride, int w,
                                             int h) {
    blend_a64_mask_bn_sy_w8n_sse4_1(dst,
                                    dst_stride,
                                    src0,
                                    src0_stride,
                                    src1,
                                    src1_stride,
                                    mask,
                                    mask_stride,
                                    w,
                                    h,
                                    blend_8_b10);
}

static void blend_a64_mask_b12_sy_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                             const uint16_t *src0, uint32_t src0_stride,
                                             const uint16_t *src1, uint32_t src1_stride,
                                             const uint8_t *mask, uint32_t mask_stride, int w,
                                             int h) {
    blend_a64_mask_bn_sy_w8n_sse4_1(dst,
                                    dst_stride,
                                    src0,
                                    src0_stride,
                                    src1,
                                    src1_stride,
                                    mask,
                                    mask_stride,
                                    w,
                                    h,
                                    blend_8_b12);
}

//////////////////////////////////////////////////////////////////////////////
// Horizontal and Vertical sub-sampling
//////////////////////////////////////////////////////////////////////////////

static INLINE void blend_a64_mask_bn_sx_sy_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                     const uint16_t *src0, uint32_t src0_stride,
                                                     const uint16_t *src1, uint32_t src1_stride,
                                                     const uint8_t *mask, uint32_t mask_stride,
                                                     int h, BlendUnitFn blend) {
    const __m128i v_zmask_b = _mm_set_epi8(
        0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff);
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        const __m128i v_ra_b   = xx_loadl_64(mask);
        const __m128i v_rb_b   = xx_loadl_64(mask + mask_stride);
        const __m128i v_rvs_b  = _mm_add_epi8(v_ra_b, v_rb_b);
        const __m128i v_rvsa_w = _mm_and_si128(v_rvs_b, v_zmask_b);
        const __m128i v_rvsb_w = _mm_and_si128(_mm_srli_si128(v_rvs_b, 1), v_zmask_b);
        const __m128i v_rs_w   = _mm_add_epi16(v_rvsa_w, v_rvsb_w);

        const __m128i v_m0_w = xx_roundn_epu16(v_rs_w, 2);
        const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

        const __m128i v_res_w = blend(src0, src1, v_m0_w, v_m1_w);

        xx_storel_64(dst, v_res_w);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

static void blend_a64_mask_b10_sx_sy_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                               const uint16_t *src0, uint32_t src0_stride,
                                               const uint16_t *src1, uint32_t src1_stride,
                                               const uint8_t *mask, uint32_t mask_stride, int w,
                                               int h) {
    (void)w;
    blend_a64_mask_bn_sx_sy_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, h, blend_4_b10);
}

static void blend_a64_mask_b12_sx_sy_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                               const uint16_t *src0, uint32_t src0_stride,
                                               const uint16_t *src1, uint32_t src1_stride,
                                               const uint8_t *mask, uint32_t mask_stride, int w,
                                               int h) {
    (void)w;
    blend_a64_mask_bn_sx_sy_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, h, blend_4_b12);
}

static INLINE void blend_a64_mask_bn_sx_sy_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                      const uint16_t *src0, uint32_t src0_stride,
                                                      const uint16_t *src1, uint32_t src1_stride,
                                                      const uint8_t *mask, uint32_t mask_stride,
                                                      int w, int h, BlendUnitFn blend) {
    const __m128i v_zmask_b = _mm_set_epi8(
        0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff, 0, 0xff);
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        int c;
        for (c = 0; c < w; c += 8) {
            const __m128i v_ra_b   = xx_loadu_128(mask + 2 * c);
            const __m128i v_rb_b   = xx_loadu_128(mask + 2 * c + mask_stride);
            const __m128i v_rvs_b  = _mm_add_epi8(v_ra_b, v_rb_b);
            const __m128i v_rvsa_w = _mm_and_si128(v_rvs_b, v_zmask_b);
            const __m128i v_rvsb_w = _mm_and_si128(_mm_srli_si128(v_rvs_b, 1), v_zmask_b);
            const __m128i v_rs_w   = _mm_add_epi16(v_rvsa_w, v_rvsb_w);

            const __m128i v_m0_w = xx_roundn_epu16(v_rs_w, 2);
            const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

            const __m128i v_res_w = blend(src0 + c, src1 + c, v_m0_w, v_m1_w);

            xx_storeu_128(dst + c, v_res_w);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 2 * mask_stride;
    } while (--h);
}

static void blend_a64_mask_b10_sx_sy_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                const uint16_t *src0, uint32_t src0_stride,
                                                const uint16_t *src1, uint32_t src1_stride,
                                                const uint8_t *mask, uint32_t mask_stride, int w,
                                                int h) {
    blend_a64_mask_bn_sx_sy_w8n_sse4_1(dst,
                                       dst_stride,
                                       src0,
                                       src0_stride,
                                       src1,
                                       src1_stride,
                                       mask,
                                       mask_stride,
                                       w,
                                       h,
                                       blend_8_b10);
}

static void blend_a64_mask_b12_sx_sy_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                const uint16_t *src0, uint32_t src0_stride,
                                                const uint16_t *src1, uint32_t src1_stride,
                                                const uint8_t *mask, uint32_t mask_stride, int w,
                                                int h) {
    blend_a64_mask_bn_sx_sy_w8n_sse4_1(dst,
                                       dst_stride,
                                       src0,
                                       src0_stride,
                                       src1,
                                       src1_stride,
                                       mask,
                                       mask_stride,
                                       w,
                                       h,
                                       blend_8_b12);
}

//////////////////////////////////////////////////////////////////////////////
// Dispatch
//////////////////////////////////////////////////////////////////////////////

void svt_aom_highbd_blend_a64_mask_8bit_sse4_1(uint8_t *dst_8, uint32_t dst_stride,
                                               const uint8_t *src0_8, uint32_t src0_stride,
                                               const uint8_t *src1_8, uint32_t src1_stride,
                                               const uint8_t *mask, uint32_t mask_stride, int w,
                                               int h, int subx, int suby, int bd) {
    typedef void (*BlendFn)(uint16_t * dst,
                            uint32_t        dst_stride,
                            const uint16_t *src0,
                            uint32_t        src0_stride,
                            const uint16_t *src1,
                            uint32_t        src1_stride,
                            const uint8_t  *mask,
                            uint32_t        mask_stride,
                            int             w,
                            int             h);

    assert(IMPLIES(src0_8 == dst_8, src0_stride == dst_stride));
    assert(IMPLIES(src1_8 == dst_8, src1_stride == dst_stride));

    assert(h >= 1);
    assert(w >= 1);
    assert(IS_POWER_OF_TWO(h));
    assert(IS_POWER_OF_TWO(w));

    assert(bd == 8 || bd == 10 || bd == 12);
    if (EB_UNLIKELY((h | w) & 3)) { // if (w <= 2 || h <= 2)
        svt_aom_highbd_blend_a64_mask_c(dst_8,
                                        dst_stride,
                                        src0_8,
                                        src0_stride,
                                        src1_8,
                                        src1_stride,
                                        mask,
                                        mask_stride,
                                        w,
                                        h,
                                        subx,
                                        suby,
                                        bd);
    } else {
        uint16_t *const       dst  = (uint16_t *)dst_8;
        const uint16_t *const src0 = (uint16_t *)src0_8;
        const uint16_t *const src1 = (uint16_t *)src1_8;
        // Dimensions are: bd_index X width_index X subx X suby
        static const BlendFn blend[2][2][2][2] = {
            {// bd == 8 or 10
             {// w % 8 == 0
              {blend_a64_mask_b10_w8n_sse4_1, blend_a64_mask_b10_sy_w8n_sse4_1},
              {blend_a64_mask_b10_sx_w8n_sse4_1, blend_a64_mask_b10_sx_sy_w8n_sse4_1}},
             {// w == 4
              {blend_a64_mask_b10_w4_sse4_1, blend_a64_mask_b10_sy_w4_sse4_1},
              {blend_a64_mask_b10_sx_w4_sse4_1, blend_a64_mask_b10_sx_sy_w4_sse4_1}}},
            {// bd == 12
             {// w % 8 == 0
              {blend_a64_mask_b12_w8n_sse4_1, blend_a64_mask_b12_sy_w8n_sse4_1},
              {blend_a64_mask_b12_sx_w8n_sse4_1, blend_a64_mask_b12_sx_sy_w8n_sse4_1}},
             {// w == 4
              {blend_a64_mask_b12_w4_sse4_1, blend_a64_mask_b12_sy_w4_sse4_1},
              {blend_a64_mask_b12_sx_w4_sse4_1, blend_a64_mask_b12_sx_sy_w4_sse4_1}}}};
        blend[bd == 12][(w >> 2) & 1][subx != 0][suby != 0](
            dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, w, h);
    }
}

/*Vertical mask related blend functions*/
static void blend_a64_vmask_w4_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                      uint32_t src0_stride, const uint8_t *src1,
                                      uint32_t src1_stride, const uint8_t *mask, int w, int h) {
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    (void)w;

    do {
        const __m128i v_m0_w = _mm_set1_epi16(*mask);
        const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

        const __m128i v_res_w = blend_4(src0, src1, &v_m0_w, &v_m1_w);

        const __m128i v_res_b = _mm_packus_epi16(v_res_w, v_res_w);

        xx_storel_32(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 1;
    } while (--h);
}

static void blend_a64_vmask_w8_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                      uint32_t src0_stride, const uint8_t *src1,
                                      uint32_t src1_stride, const uint8_t *mask, int w, int h) {
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    (void)w;

    do {
        const __m128i v_m0_w = _mm_set1_epi16(*mask);
        const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

        const __m128i v_res_w = blend_8(src0, src1, &v_m0_w, &v_m1_w);

        const __m128i v_res_b = _mm_packus_epi16(v_res_w, v_res_w);

        xx_storel_64(dst, v_res_b);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 1;
    } while (--h);
}

static void blend_a64_vmask_w16n_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                        uint32_t src0_stride, const uint8_t *src1,
                                        uint32_t src1_stride, const uint8_t *mask, int w, int h) {
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        int           c;
        const __m128i v_m0_w = _mm_set1_epi16(*mask);
        const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);
        for (c = 0; c < w; c += 16) {
            const __m128i v_resl_w = blend_8(src0 + c, src1 + c, &v_m0_w, &v_m1_w);
            const __m128i v_resh_w = blend_8(src0 + c + 8, src1 + c + 8, &v_m0_w, &v_m1_w);

            const __m128i v_res_b = _mm_packus_epi16(v_resl_w, v_resh_w);

            xx_storeu_128(dst + c, v_res_b);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 1;
    } while (--h);
}

//////////////////////////////////////////////////////////////////////////////
// Dispatch
//////////////////////////////////////////////////////////////////////////////

void svt_aom_blend_a64_vmask_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                    uint32_t src0_stride, const uint8_t *src1, uint32_t src1_stride,
                                    const uint8_t *mask, int w, int h) {
    typedef void (*BlendFn)(uint8_t * dst,
                            uint32_t       dst_stride,
                            const uint8_t *src0,
                            uint32_t       src0_stride,
                            const uint8_t *src1,
                            uint32_t       src1_stride,
                            const uint8_t *mask,
                            int            w,
                            int            h);

    // Dimension: width_index
    static const BlendFn blend[9] = {
        blend_a64_vmask_w16n_sse4_1, // w % 16 == 0
        svt_aom_blend_a64_vmask_c, // w == 1
        svt_aom_blend_a64_vmask_c, // w == 2
        NULL, // INVALID
        blend_a64_vmask_w4_sse4_1, // w == 4
        NULL, // INVALID
        NULL, // INVALID
        NULL, // INVALID
        blend_a64_vmask_w8_sse4_1, // w == 8
    };

    assert(IMPLIES(src0 == dst, src0_stride == dst_stride));
    assert(IMPLIES(src1 == dst, src1_stride == dst_stride));

    assert(h >= 1);
    assert(w >= 1);
    assert(IS_POWER_OF_TWO(h));
    assert(IS_POWER_OF_TWO(w));

    blend[w & 0xf](dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, w, h);
}

//////////////////////////////////////////////////////////////////////////////
// Implementation - No sub-sampling
//////////////////////////////////////////////////////////////////////////////

static INLINE void blend_a64_vmask_bn_w4_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                const uint16_t *src0, uint32_t src0_stride,
                                                const uint16_t *src1, uint32_t src1_stride,
                                                const uint8_t *mask, int h, BlendUnitFn blend) {
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        const __m128i v_m0_w = _mm_set1_epi16(*mask);
        const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);

        const __m128i v_res_w = blend(src0, src1, v_m0_w, v_m1_w);

        xx_storel_64(dst, v_res_w);

        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 1;
    } while (--h);
}

static void blend_a64_vmask_b10_w4_sse4_1(uint16_t *dst, uint32_t dst_stride, const uint16_t *src0,
                                          uint32_t src0_stride, const uint16_t *src1,
                                          uint32_t src1_stride, const uint8_t *mask, int w, int h) {
    (void)w;
    blend_a64_vmask_bn_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, h, blend_4_b10);
}

static void blend_a64_vmask_b12_w4_sse4_1(uint16_t *dst, uint32_t dst_stride, const uint16_t *src0,
                                          uint32_t src0_stride, const uint16_t *src1,
                                          uint32_t src1_stride, const uint8_t *mask, int w, int h) {
    (void)w;
    blend_a64_vmask_bn_w4_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, h, blend_4_b12);
}

static INLINE void blend_a64_vmask_bn_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                 const uint16_t *src0, uint32_t src0_stride,
                                                 const uint16_t *src1, uint32_t src1_stride,
                                                 const uint8_t *mask, int w, int h,
                                                 BlendUnitFn blend) {
    const __m128i v_maxval_w = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    do {
        int           c;
        const __m128i v_m0_w = _mm_set1_epi16(*mask);
        const __m128i v_m1_w = _mm_sub_epi16(v_maxval_w, v_m0_w);
        for (c = 0; c < w; c += 8) {
            const __m128i v_res_w = blend(src0 + c, src1 + c, v_m0_w, v_m1_w);

            xx_storeu_128(dst + c, v_res_w);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += 1;
    } while (--h);
}

static void blend_a64_vmask_b10_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride, const uint16_t *src0,
                                           uint32_t src0_stride, const uint16_t *src1,
                                           uint32_t src1_stride, const uint8_t *mask, int w,
                                           int h) {
    blend_a64_vmask_bn_w8n_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, w, h, blend_8_b10);
}

static void blend_a64_vmask_b12_w8n_sse4_1(uint16_t *dst, uint32_t dst_stride, const uint16_t *src0,
                                           uint32_t src0_stride, const uint16_t *src1,
                                           uint32_t src1_stride, const uint8_t *mask, int w,
                                           int h) {
    blend_a64_vmask_bn_w8n_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, w, h, blend_8_b12);
}

//////////////////////////////////////////////////////////////////////////////
// Dispatch
//////////////////////////////////////////////////////////////////////////////

void svt_aom_highbd_blend_a64_vmask_8bit_sse4_1(uint8_t *dst_8, uint32_t dst_stride,
                                                const uint8_t *src0_8, uint32_t src0_stride,
                                                const uint8_t *src1_8, uint32_t src1_stride,
                                                const uint8_t *mask, int w, int h, int bd) {
    typedef void (*BlendFn)(uint16_t * dst,
                            uint32_t        dst_stride,
                            const uint16_t *src0,
                            uint32_t        src0_stride,
                            const uint16_t *src1,
                            uint32_t        src1_stride,
                            const uint8_t  *mask,
                            int             w,
                            int             h);

    assert(IMPLIES(src0_8 == dst_8, src0_stride == dst_stride));
    assert(IMPLIES(src1_8 == dst_8, src1_stride == dst_stride));

    assert(h >= 1);
    assert(w >= 1);
    assert(IS_POWER_OF_TWO(h));
    assert(IS_POWER_OF_TWO(w));

    assert(bd == 8 || bd == 10 || bd == 12);

    if (EB_UNLIKELY((h | w) & 3)) { // if (w <= 2 || h <= 2)
        svt_aom_highbd_blend_a64_vmask_8bit_c(
            dst_8, dst_stride, src0_8, src0_stride, src1_8, src1_stride, mask, w, h, bd);
    } else {
        uint16_t *const       dst  = (uint16_t *)(dst_8); // CONVERT_TO_SHORTPTR(dst_8);
        const uint16_t *const src0 = (uint16_t *)(src0_8); //CONVERT_TO_SHORTPTR(src0_8);
        const uint16_t *const src1 = (uint16_t *)(src1_8); //CONVERT_TO_SHORTPTR(src1_8);
        // Dimensions are: bd_index X width_index
        static const BlendFn blend[2][2] = {{
                                                // bd == 8 or 10
                                                blend_a64_vmask_b10_w8n_sse4_1, // w % 8 == 0
                                                blend_a64_vmask_b10_w4_sse4_1, // w == 4
                                            },
                                            {
                                                // bd == 12
                                                blend_a64_vmask_b12_w8n_sse4_1, // w % 8 == 0
                                                blend_a64_vmask_b12_w4_sse4_1, // w == 4
                                            }};
        blend[bd == 12][(w >> 2) & 1](
            dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, w, h);
    }
}

/*Horizontal related blend functions*/

// To start out, just dispatch to the function using the 2D mask and
// pass mask stride as 0. This can be improved upon if necessary.

void svt_aom_blend_a64_hmask_sse4_1(uint8_t *dst, uint32_t dst_stride, const uint8_t *src0,
                                    uint32_t src0_stride, const uint8_t *src1, uint32_t src1_stride,
                                    const uint8_t *mask, int w, int h) {
    svt_aom_blend_a64_mask_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, 0, w, h, 0, 0);
}

void svt_aom_highbd_blend_a64_hmask_8bit_sse4_1(uint8_t *dst_8, uint32_t dst_stride,
                                                const uint8_t *src0_8, uint32_t src0_stride,
                                                const uint8_t *src1_8, uint32_t src1_stride,
                                                const uint8_t *mask, int w, int h, int bd) {
    svt_aom_highbd_blend_a64_mask_8bit_sse4_1(
        dst_8, dst_stride, src0_8, src0_stride, src1_8, src1_stride, mask, 0, w, h, 0, 0, bd);
}

void svt_aom_highbd_blend_a64_mask_16bit_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                const uint16_t *src0, uint32_t src0_stride,
                                                const uint16_t *src1, uint32_t src1_stride,
                                                const uint8_t *mask, uint32_t mask_stride, int w,
                                                int h, int subw, int subh, int bd) {
    typedef void (*BlendFn)(uint16_t * dst,
                            uint32_t        dst_stride,
                            const uint16_t *src0,
                            uint32_t        src0_stride,
                            const uint16_t *src1,
                            uint32_t        src1_stride,
                            const uint8_t  *mask,
                            uint32_t        mask_stride,
                            int             w,
                            int             h);

    assert(IMPLIES(src0 == dst, src0_stride == dst_stride));
    assert(IMPLIES(src1 == dst, src1_stride == dst_stride));

    assert(h >= 1);
    assert(w >= 1);
    assert(IS_POWER_OF_TWO(h));
    assert(IS_POWER_OF_TWO(w));

    assert(bd == 8 || bd == 10 || bd == 12);
    if (EB_UNLIKELY((h | w) & 3)) { // if (w <= 2 || h <= 2)
        svt_aom_highbd_blend_a64_mask_c((uint8_t *)dst,
                                        dst_stride,
                                        (uint8_t *)src0,
                                        src0_stride,
                                        (uint8_t *)src1,
                                        src1_stride,
                                        mask,
                                        mask_stride,
                                        w,
                                        h,
                                        subw,
                                        subh,
                                        bd);
    } else {
        //uint16_t *const dst = CONVERT_TO_SHORTPTR(dst_8);
        //const uint16_t *const src0 = CONVERT_TO_SHORTPTR(src0_8);
        //const uint16_t *const src1 = CONVERT_TO_SHORTPTR(src1_8);
        // Dimensions are: bd_index X width_index X subw X subh
        static const BlendFn blend[2][2][2][2] = {
            {// bd == 8 or 10
             {// w % 8 == 0
              {blend_a64_mask_b10_w8n_sse4_1, blend_a64_mask_b10_sy_w8n_sse4_1},
              {blend_a64_mask_b10_sx_w8n_sse4_1, blend_a64_mask_b10_sx_sy_w8n_sse4_1}},
             {// w == 4
              {blend_a64_mask_b10_w4_sse4_1, blend_a64_mask_b10_sy_w4_sse4_1},
              {blend_a64_mask_b10_sx_w4_sse4_1, blend_a64_mask_b10_sx_sy_w4_sse4_1}}},
            {// bd == 12
             {// w % 8 == 0
              {blend_a64_mask_b12_w8n_sse4_1, blend_a64_mask_b12_sy_w8n_sse4_1},
              {blend_a64_mask_b12_sx_w8n_sse4_1, blend_a64_mask_b12_sx_sy_w8n_sse4_1}},
             {// w == 4
              {blend_a64_mask_b12_w4_sse4_1, blend_a64_mask_b12_sy_w4_sse4_1},
              {blend_a64_mask_b12_sx_w4_sse4_1, blend_a64_mask_b12_sx_sy_w4_sse4_1}}}};
        blend[bd == 12][(w >> 2) & 1][subw != 0][subh != 0](
            dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, mask_stride, w, h);
    }
}
void svt_aom_highbd_blend_a64_hmask_16bit_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                 const uint16_t *src0, uint32_t src0_stride,
                                                 const uint16_t *src1, uint32_t src1_stride,
                                                 const uint8_t *mask, int w, int h, int bd) {
    svt_aom_highbd_blend_a64_mask_16bit_sse4_1(
        dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, 0, w, h, 0, 0, bd);
}

void svt_aom_highbd_blend_a64_vmask_16bit_sse4_1(uint16_t *dst, uint32_t dst_stride,
                                                 const uint16_t *src0, uint32_t src0_stride,
                                                 const uint16_t *src1, uint32_t src1_stride,
                                                 const uint8_t *mask, int w, int h, int bd) {
    typedef void (*BlendFn)(uint16_t * dst,
                            uint32_t        dst_stride,
                            const uint16_t *src0,
                            uint32_t        src0_stride,
                            const uint16_t *src1,
                            uint32_t        src1_stride,
                            const uint8_t  *mask,
                            int             w,
                            int             h);

    assert(IMPLIES(src0 == dst, src0_stride == dst_stride));
    assert(IMPLIES(src1 == dst, src1_stride == dst_stride));

    assert(h >= 1);
    assert(w >= 1);
    assert(IS_POWER_OF_TWO(h));
    assert(IS_POWER_OF_TWO(w));

    assert(bd == 8 || bd == 10 || bd == 12);

    if (EB_UNLIKELY((h | w) & 3)) { // if (w <= 2 || h <= 2)
        svt_aom_highbd_blend_a64_vmask_16bit_c(
            dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, w, h, bd);
    } else {
        //uint16_t *const dst = CONVERT_TO_SHORTPTR(dst_8);
        //const uint16_t *const src0 = CONVERT_TO_SHORTPTR(src0_8);
        //const uint16_t *const src1 = CONVERT_TO_SHORTPTR(src1_8);
        // Dimensions are: bd_index X width_index
        static const BlendFn blend[2][2] = {{
                                                // bd == 8 or 10
                                                blend_a64_vmask_b10_w8n_sse4_1, // w % 8 == 0
                                                blend_a64_vmask_b10_w4_sse4_1, // w == 4
                                            },
                                            {
                                                // bd == 12
                                                blend_a64_vmask_b12_w8n_sse4_1, // w % 8 == 0
                                                blend_a64_vmask_b12_w4_sse4_1, // w == 4
                                            }};
        blend[bd == 12][(w >> 2) & 1](
            dst, dst_stride, src0, src0_stride, src1, src1_stride, mask, w, h);
    }
}

static INLINE void highbd_blend_a64_d16_mask_w4_sse4_1(
    uint16_t *dst, int dst_stride, const CONV_BUF_TYPE *src0, int src0_stride,
    const CONV_BUF_TYPE *src1, int src1_stride, const __m128i *mask0a, const __m128i *mask0b,
    const __m128i *round_offset, int shift, const __m128i *clip_low, const __m128i *clip_high,
    const __m128i *mask_max) {
    // Load 4 pixels from each of 4 rows from each source
    const __m128i s0a = _mm_set_epi64x(*(uint64_t *)src0, *(uint64_t *)(src0 + src0_stride));
    const __m128i s0b = _mm_set_epi64x(*(uint64_t *)(src0 + 2 * src0_stride),
                                       *(uint64_t *)(src0 + 3 * src0_stride));
    const __m128i s1a = _mm_set_epi64x(*(uint64_t *)(src1), *(uint64_t *)(src1 + src1_stride));
    const __m128i s1b = _mm_set_epi64x(*(uint64_t *)(src1 + 2 * src1_stride),
                                       *(uint64_t *)(src1 + 3 * src1_stride));

    // Generate the inverse masks
    const __m128i mask1a = _mm_sub_epi16(*mask_max, *mask0a);
    const __m128i mask1b = _mm_sub_epi16(*mask_max, *mask0b);

    // Multiply each mask by the respective source
    const __m128i mul0a_highs = _mm_mulhi_epu16(*mask0a, s0a);
    const __m128i mul0a_lows  = _mm_mullo_epi16(*mask0a, s0a);
    const __m128i mul0ah      = _mm_unpackhi_epi16(mul0a_lows, mul0a_highs);
    const __m128i mul0al      = _mm_unpacklo_epi16(mul0a_lows, mul0a_highs);
    const __m128i mul1a_highs = _mm_mulhi_epu16(mask1a, s1a);
    const __m128i mul1a_lows  = _mm_mullo_epi16(mask1a, s1a);
    const __m128i mul1ah      = _mm_unpackhi_epi16(mul1a_lows, mul1a_highs);
    const __m128i mul1al      = _mm_unpacklo_epi16(mul1a_lows, mul1a_highs);

    const __m128i mul0b_highs = _mm_mulhi_epu16(*mask0b, s0b);
    const __m128i mul0b_lows  = _mm_mullo_epi16(*mask0b, s0b);
    const __m128i mul0bh      = _mm_unpackhi_epi16(mul0b_lows, mul0b_highs);
    const __m128i mul0bl      = _mm_unpacklo_epi16(mul0b_lows, mul0b_highs);
    const __m128i mul1b_highs = _mm_mulhi_epu16(mask1b, s1b);
    const __m128i mul1b_lows  = _mm_mullo_epi16(mask1b, s1b);
    const __m128i mul1bh      = _mm_unpackhi_epi16(mul1b_lows, mul1b_highs);
    const __m128i mul1bl      = _mm_unpacklo_epi16(mul1b_lows, mul1b_highs);

    const __m128i sumah = _mm_add_epi32(mul0ah, mul1ah);
    const __m128i sumal = _mm_add_epi32(mul0al, mul1al);
    const __m128i sumbh = _mm_add_epi32(mul0bh, mul1bh);
    const __m128i sumbl = _mm_add_epi32(mul0bl, mul1bl);

    const __m128i roundah = _mm_srai_epi32(_mm_sub_epi32(sumah, *round_offset), shift);
    const __m128i roundbh = _mm_srai_epi32(_mm_sub_epi32(sumbh, *round_offset), shift);
    const __m128i roundal = _mm_srai_epi32(_mm_sub_epi32(sumal, *round_offset), shift);
    const __m128i roundbl = _mm_srai_epi32(_mm_sub_epi32(sumbl, *round_offset), shift);

    const __m128i packa = _mm_packs_epi32(roundal, roundah);
    const __m128i packb = _mm_packs_epi32(roundbl, roundbh);

    const __m128i clipa = _mm_min_epi16(_mm_max_epi16(packa, *clip_low), *clip_high);
    const __m128i clipb = _mm_min_epi16(_mm_max_epi16(packb, *clip_low), *clip_high);

    xx_storel_64(dst, _mm_srli_si128(clipa, 8));
    xx_storel_64(dst + dst_stride, clipa);
    xx_storel_64(dst + 2 * dst_stride, _mm_srli_si128(clipb, 8));
    xx_storel_64(dst + 3 * dst_stride, clipb);
}

static INLINE void highbd_blend_a64_d16_mask_subw0_subh0_w4_sse4_1(
    uint16_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, const __m128i *round_offset, int shift, const __m128i *clip_low,
    const __m128i *clip_high, const __m128i *mask_max) {
    do {
        const __m128i mask0a8 = _mm_set_epi32(
            0, 0, *(uint32_t *)mask, *(uint32_t *)(mask + mask_stride));
        const __m128i mask0b8 = _mm_set_epi32(
            0, 0, *(uint32_t *)(mask + 2 * mask_stride), *(uint32_t *)(mask + 3 * mask_stride));
        const __m128i mask0a = _mm_cvtepu8_epi16(mask0a8);
        const __m128i mask0b = _mm_cvtepu8_epi16(mask0b8);

        highbd_blend_a64_d16_mask_w4_sse4_1(dst,
                                            dst_stride,
                                            src0,
                                            src0_stride,
                                            src1,
                                            src1_stride,
                                            &mask0a,
                                            &mask0b,
                                            round_offset,
                                            shift,
                                            clip_low,
                                            clip_high,
                                            mask_max);

        dst += dst_stride * 4;
        src0 += src0_stride * 4;
        src1 += src1_stride * 4;
        mask += mask_stride * 4;
    } while (h -= 4);
}

static INLINE void highbd_blend_a64_d16_mask_w8_sse4_1(
    uint16_t *dst, int dst_stride, const CONV_BUF_TYPE *src0, int src0_stride,
    const CONV_BUF_TYPE *src1, int src1_stride, const __m128i *mask0a, const __m128i *mask0b,
    const __m128i *round_offset, int shift, const __m128i *clip_low, const __m128i *clip_high,
    const __m128i *max_mask) {
    // Load 8x pixels from each of 2 rows from each source
    const __m128i s0a = xx_loadu_128(src0);
    const __m128i s0b = xx_loadu_128(src0 + src0_stride);
    const __m128i s1a = xx_loadu_128(src1);
    const __m128i s1b = xx_loadu_128(src1 + src1_stride);

    // Generate inverse masks
    const __m128i mask1a = _mm_sub_epi16(*max_mask, *mask0a);
    const __m128i mask1b = _mm_sub_epi16(*max_mask, *mask0b);

    // Multiply sources by respective masks
    const __m128i mul0a_highs = _mm_mulhi_epu16(*mask0a, s0a);
    const __m128i mul0a_lows  = _mm_mullo_epi16(*mask0a, s0a);
    const __m128i mul0ah      = _mm_unpackhi_epi16(mul0a_lows, mul0a_highs);
    const __m128i mul0al      = _mm_unpacklo_epi16(mul0a_lows, mul0a_highs);

    const __m128i mul1a_highs = _mm_mulhi_epu16(mask1a, s1a);
    const __m128i mul1a_lows  = _mm_mullo_epi16(mask1a, s1a);
    const __m128i mul1ah      = _mm_unpackhi_epi16(mul1a_lows, mul1a_highs);
    const __m128i mul1al      = _mm_unpacklo_epi16(mul1a_lows, mul1a_highs);

    const __m128i sumah = _mm_add_epi32(mul0ah, mul1ah);
    const __m128i sumal = _mm_add_epi32(mul0al, mul1al);

    const __m128i mul0b_highs = _mm_mulhi_epu16(*mask0b, s0b);
    const __m128i mul0b_lows  = _mm_mullo_epi16(*mask0b, s0b);
    const __m128i mul0bh      = _mm_unpackhi_epi16(mul0b_lows, mul0b_highs);
    const __m128i mul0bl      = _mm_unpacklo_epi16(mul0b_lows, mul0b_highs);

    const __m128i mul1b_highs = _mm_mulhi_epu16(mask1b, s1b);
    const __m128i mul1b_lows  = _mm_mullo_epi16(mask1b, s1b);
    const __m128i mul1bh      = _mm_unpackhi_epi16(mul1b_lows, mul1b_highs);
    const __m128i mul1bl      = _mm_unpacklo_epi16(mul1b_lows, mul1b_highs);

    const __m128i sumbh = _mm_add_epi32(mul0bh, mul1bh);
    const __m128i sumbl = _mm_add_epi32(mul0bl, mul1bl);

    const __m128i roundah = _mm_srai_epi32(_mm_sub_epi32(sumah, *round_offset), shift);
    const __m128i roundal = _mm_srai_epi32(_mm_sub_epi32(sumal, *round_offset), shift);
    const __m128i roundbh = _mm_srai_epi32(_mm_sub_epi32(sumbh, *round_offset), shift);
    const __m128i roundbl = _mm_srai_epi32(_mm_sub_epi32(sumbl, *round_offset), shift);

    const __m128i packa = _mm_packs_epi32(roundal, roundah);
    const __m128i clipa = _mm_min_epi16(_mm_max_epi16(packa, *clip_low), *clip_high);
    const __m128i packb = _mm_packs_epi32(roundbl, roundbh);
    const __m128i clipb = _mm_min_epi16(_mm_max_epi16(packb, *clip_low), *clip_high);

    _mm_storeu_si128((__m128i *)dst, clipa);
    _mm_storeu_si128((__m128i *)(dst + dst_stride), clipb);
}

static INLINE void highbd_blend_a64_d16_mask_subw0_subh0_w8_sse4_1(
    uint16_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, const __m128i *round_offset, int shift, const __m128i *clip_low,
    const __m128i *clip_high, const __m128i *max_mask) {
    do {
        const __m128i mask0a = _mm_cvtepu8_epi16(xx_loadl_64(mask));
        const __m128i mask0b = _mm_cvtepu8_epi16(xx_loadl_64(mask + mask_stride));
        highbd_blend_a64_d16_mask_w8_sse4_1(dst,
                                            dst_stride,
                                            src0,
                                            src0_stride,
                                            src1,
                                            src1_stride,
                                            &mask0a,
                                            &mask0b,
                                            round_offset,
                                            shift,
                                            clip_low,
                                            clip_high,
                                            max_mask);

        dst += dst_stride * 2;
        src0 += src0_stride * 2;
        src1 += src1_stride * 2;
        mask += mask_stride * 2;
    } while (h -= 2);
}

static INLINE void highbd_blend_a64_d16_mask_w16_sse4_1(
    uint16_t *dst, const CONV_BUF_TYPE *src0, const CONV_BUF_TYPE *src1,
    const __m128i *round_offset, int shift, const __m128i *mask0l, const __m128i *mask0h,
    const __m128i *clip_low, const __m128i *clip_high, const __m128i *mask_max) {
    // Load 16x u16 pixels for this row from each src
    const __m128i s0l = xx_loadu_128(src0);
    const __m128i s0h = xx_loadu_128(src0 + 8);
    const __m128i s1l = xx_loadu_128(src1);
    const __m128i s1h = xx_loadu_128(src1 + 8);

    // Calculate inverse masks
    const __m128i mask1h = _mm_sub_epi16(*mask_max, *mask0h);
    const __m128i mask1l = _mm_sub_epi16(*mask_max, *mask0l);

    const __m128i mul0_highs = _mm_mulhi_epu16(*mask0h, s0h);
    const __m128i mul0_lows  = _mm_mullo_epi16(*mask0h, s0h);
    const __m128i mul0h      = _mm_unpackhi_epi16(mul0_lows, mul0_highs);
    const __m128i mul0l      = _mm_unpacklo_epi16(mul0_lows, mul0_highs);

    const __m128i mul1_highs = _mm_mulhi_epu16(mask1h, s1h);
    const __m128i mul1_lows  = _mm_mullo_epi16(mask1h, s1h);
    const __m128i mul1h      = _mm_unpackhi_epi16(mul1_lows, mul1_highs);
    const __m128i mul1l      = _mm_unpacklo_epi16(mul1_lows, mul1_highs);

    const __m128i mulhh = _mm_add_epi32(mul0h, mul1h);
    const __m128i mulhl = _mm_add_epi32(mul0l, mul1l);

    const __m128i mul2_highs = _mm_mulhi_epu16(*mask0l, s0l);
    const __m128i mul2_lows  = _mm_mullo_epi16(*mask0l, s0l);
    const __m128i mul2h      = _mm_unpackhi_epi16(mul2_lows, mul2_highs);
    const __m128i mul2l      = _mm_unpacklo_epi16(mul2_lows, mul2_highs);

    const __m128i mul3_highs = _mm_mulhi_epu16(mask1l, s1l);
    const __m128i mul3_lows  = _mm_mullo_epi16(mask1l, s1l);
    const __m128i mul3h      = _mm_unpackhi_epi16(mul3_lows, mul3_highs);
    const __m128i mul3l      = _mm_unpacklo_epi16(mul3_lows, mul3_highs);

    const __m128i mullh = _mm_add_epi32(mul2h, mul3h);
    const __m128i mulll = _mm_add_epi32(mul2l, mul3l);

    const __m128i reshh = _mm_srai_epi32(_mm_sub_epi32(mulhh, *round_offset), shift);
    const __m128i reshl = _mm_srai_epi32(_mm_sub_epi32(mulhl, *round_offset), shift);
    const __m128i reslh = _mm_srai_epi32(_mm_sub_epi32(mullh, *round_offset), shift);
    const __m128i resll = _mm_srai_epi32(_mm_sub_epi32(mulll, *round_offset), shift);

    // Signed saturating pack from i32 to i16:
    const __m128i packh = _mm_packs_epi32(reshl, reshh);
    const __m128i packl = _mm_packs_epi32(resll, reslh);

    // Clip the values to the valid range
    const __m128i cliph = _mm_min_epi16(_mm_max_epi16(packh, *clip_low), *clip_high);
    const __m128i clipl = _mm_min_epi16(_mm_max_epi16(packl, *clip_low), *clip_high);

    // Store 16 pixels
    xx_storeu_128(dst, clipl);
    xx_storeu_128(dst + 8, cliph);
}

static INLINE void highbd_blend_a64_d16_mask_subw0_subh0_w16_sse4_1(
    uint16_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, int w, const __m128i *round_offset, int shift, const __m128i *clip_low,
    const __m128i *clip_high, const __m128i *mask_max) {
    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j += 16) {
            // Load 16x u8 alpha-mask values and pad to u16
            const __m128i masks_u8 = xx_loadu_128(mask + j);
            const __m128i mask0l   = _mm_cvtepu8_epi16(masks_u8);
            const __m128i mask0h   = _mm_cvtepu8_epi16(_mm_srli_si128(masks_u8, 8));

            highbd_blend_a64_d16_mask_w16_sse4_1(dst + j,
                                                 src0 + j,
                                                 src1 + j,
                                                 round_offset,
                                                 shift,
                                                 &mask0l,
                                                 &mask0h,
                                                 clip_low,
                                                 clip_high,
                                                 mask_max);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride;
    }
}

static INLINE void highbd_blend_a64_d16_mask_subw1_subh1_w4_sse4_1(
    uint16_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, const __m128i *round_offset, int shift, const __m128i *clip_low,
    const __m128i *clip_high, const __m128i *mask_max) {
    const __m128i one_b = _mm_set1_epi8(1);
    const __m128i two_w = _mm_set1_epi16(2);
    do {
        // Load 8 pixels from each of 8 rows of mask,
        // (saturating) add together rows then use madd to add adjacent pixels
        // Finally, divide each value by 4 (with rounding)
        const __m128i m02     = _mm_set_epi64x(*(uint64_t *)(mask),
                                           *(uint64_t *)(mask + 2 * mask_stride));
        const __m128i m13     = _mm_set_epi64x(*(uint64_t *)(mask + mask_stride),
                                           *(uint64_t *)(mask + 3 * mask_stride));
        const __m128i m0123   = _mm_maddubs_epi16(_mm_adds_epu8(m02, m13), one_b);
        const __m128i mask_0a = _mm_srli_epi16(_mm_add_epi16(m0123, two_w), 2);
        const __m128i m46     = _mm_set_epi64x(*(uint64_t *)(mask + 4 * mask_stride),
                                           *(uint64_t *)(mask + 6 * mask_stride));
        const __m128i m57     = _mm_set_epi64x(*(uint64_t *)(mask + 5 * mask_stride),
                                           *(uint64_t *)(mask + 7 * mask_stride));
        const __m128i m4567   = _mm_maddubs_epi16(_mm_adds_epu8(m46, m57), one_b);
        const __m128i mask_0b = _mm_srli_epi16(_mm_add_epi16(m4567, two_w), 2);

        highbd_blend_a64_d16_mask_w4_sse4_1(dst,
                                            dst_stride,
                                            src0,
                                            src0_stride,
                                            src1,
                                            src1_stride,
                                            &mask_0a,
                                            &mask_0b,
                                            round_offset,
                                            shift,
                                            clip_low,
                                            clip_high,
                                            mask_max);

        dst += dst_stride * 4;
        src0 += src0_stride * 4;
        src1 += src1_stride * 4;
        mask += mask_stride * 8;
    } while (h -= 4);
}

static INLINE void highbd_blend_a64_d16_mask_subw1_subh1_w8_sse4_1(
    uint16_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, const __m128i *round_offset, int shift, const __m128i *clip_low,
    const __m128i *clip_high, const __m128i *max_mask) {
    const __m128i one_b = _mm_set1_epi8(1);
    const __m128i two_w = _mm_set1_epi16(2);
    do {
        const __m128i mask_thisrowa  = xx_loadu_128(mask);
        const __m128i mask_nextrowa  = xx_loadu_128(mask + mask_stride);
        const __m128i mask_thisrowb  = xx_loadu_128(mask + 2 * mask_stride);
        const __m128i mask_nextrowb  = xx_loadu_128(mask + 3 * mask_stride);
        const __m128i mask_bothrowsa = _mm_adds_epu8(mask_thisrowa, mask_nextrowa);
        const __m128i mask_bothrowsb = _mm_adds_epu8(mask_thisrowb, mask_nextrowb);
        const __m128i mask_16a       = _mm_maddubs_epi16(mask_bothrowsa, one_b);
        const __m128i mask_16b       = _mm_maddubs_epi16(mask_bothrowsb, one_b);
        const __m128i mask_sa        = _mm_srli_epi16(_mm_add_epi16(mask_16a, two_w), 2);
        const __m128i mask_sb        = _mm_srli_epi16(_mm_add_epi16(mask_16b, two_w), 2);

        highbd_blend_a64_d16_mask_w8_sse4_1(dst,
                                            dst_stride,
                                            src0,
                                            src0_stride,
                                            src1,
                                            src1_stride,
                                            &mask_sa,
                                            &mask_sb,
                                            round_offset,
                                            shift,
                                            clip_low,
                                            clip_high,
                                            max_mask);

        dst += dst_stride * 2;
        src0 += src0_stride * 2;
        src1 += src1_stride * 2;
        mask += mask_stride * 4;
    } while (h -= 2);
}

static INLINE void highbd_blend_a64_d16_mask_subw1_subh1_w16_sse4_1(
    uint16_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, int w, const __m128i *round_offset, int shift, const __m128i *clip_low,
    const __m128i *clip_high, const __m128i *mask_max) {
    const __m128i one_b = _mm_set1_epi8(1);
    const __m128i two_w = _mm_set1_epi16(2);
    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j += 16) {
            const __m128i m_i00 = xx_loadu_128(mask + 2 * j);
            const __m128i m_i01 = xx_loadu_128(mask + 2 * j + 16);
            const __m128i m_i10 = xx_loadu_128(mask + mask_stride + 2 * j);
            const __m128i m_i11 = xx_loadu_128(mask + mask_stride + 2 * j + 16);

            const __m128i m0_ac   = _mm_adds_epu8(m_i00, m_i10);
            const __m128i m1_ac   = _mm_adds_epu8(m_i01, m_i11);
            const __m128i m0_acbd = _mm_maddubs_epi16(m0_ac, one_b);
            const __m128i m1_acbd = _mm_maddubs_epi16(m1_ac, one_b);
            const __m128i mask_l  = _mm_srli_epi16(_mm_add_epi16(m0_acbd, two_w), 2);
            const __m128i mask_h  = _mm_srli_epi16(_mm_add_epi16(m1_acbd, two_w), 2);

            highbd_blend_a64_d16_mask_w16_sse4_1(dst + j,
                                                 src0 + j,
                                                 src1 + j,
                                                 round_offset,
                                                 shift,
                                                 &mask_l,
                                                 &mask_h,
                                                 clip_low,
                                                 clip_high,
                                                 mask_max);
        }
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
        mask += mask_stride * 2;
    }
}

void svt_aom_highbd_blend_a64_d16_mask_sse4_1(uint8_t *dst8, uint32_t dst_stride,
                                              const CONV_BUF_TYPE *src0, uint32_t src0_stride,
                                              const CONV_BUF_TYPE *src1, uint32_t src1_stride,
                                              const uint8_t *mask, uint32_t mask_stride, int w,
                                              int h, int subw, int subh,
                                              ConvolveParams *conv_params, const int bd) {
    uint16_t     *dst        = (uint16_t *)(dst8);
    const int     round_bits = 2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const int32_t round_offset =
        ((1 << (round_bits + bd)) + (1 << (round_bits + bd - 1)) - (1 << (round_bits - 1)))
        << AOM_BLEND_A64_ROUND_BITS;
    const __m128i v_round_offset = _mm_set1_epi32(round_offset);
    const int     shift          = round_bits + AOM_BLEND_A64_ROUND_BITS;

    const __m128i clip_low  = _mm_set1_epi16(0);
    const __m128i clip_high = _mm_set1_epi16((1 << bd) - 1);
    const __m128i mask_max  = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);

    assert(IMPLIES((void *)src0 == dst, src0_stride == dst_stride));
    assert(IMPLIES((void *)src1 == dst, src1_stride == dst_stride));

    assert(h >= 4);
    assert(w >= 4);
    assert(IS_POWER_OF_TWO(h));
    assert(IS_POWER_OF_TWO(w));

    if (subw == 0 && subh == 0) {
        switch (w) {
        case 4:
            highbd_blend_a64_d16_mask_subw0_subh0_w4_sse4_1(dst,
                                                            dst_stride,
                                                            src0,
                                                            src0_stride,
                                                            src1,
                                                            src1_stride,
                                                            mask,
                                                            mask_stride,
                                                            h,
                                                            &v_round_offset,
                                                            shift,
                                                            &clip_low,
                                                            &clip_high,
                                                            &mask_max);
            break;
        case 8:
            highbd_blend_a64_d16_mask_subw0_subh0_w8_sse4_1(dst,
                                                            dst_stride,
                                                            src0,
                                                            src0_stride,
                                                            src1,
                                                            src1_stride,
                                                            mask,
                                                            mask_stride,
                                                            h,
                                                            &v_round_offset,
                                                            shift,
                                                            &clip_low,
                                                            &clip_high,
                                                            &mask_max);
            break;
        default: // >=16
            highbd_blend_a64_d16_mask_subw0_subh0_w16_sse4_1(dst,
                                                             dst_stride,
                                                             src0,
                                                             src0_stride,
                                                             src1,
                                                             src1_stride,
                                                             mask,
                                                             mask_stride,
                                                             h,
                                                             w,
                                                             &v_round_offset,
                                                             shift,
                                                             &clip_low,
                                                             &clip_high,
                                                             &mask_max);
            break;
        }

    } else if (subw == 1 && subh == 1) {
        switch (w) {
        case 4:
            highbd_blend_a64_d16_mask_subw1_subh1_w4_sse4_1(dst,
                                                            dst_stride,
                                                            src0,
                                                            src0_stride,
                                                            src1,
                                                            src1_stride,
                                                            mask,
                                                            mask_stride,
                                                            h,
                                                            &v_round_offset,
                                                            shift,
                                                            &clip_low,
                                                            &clip_high,
                                                            &mask_max);
            break;
        case 8:
            highbd_blend_a64_d16_mask_subw1_subh1_w8_sse4_1(dst,
                                                            dst_stride,
                                                            src0,
                                                            src0_stride,
                                                            src1,
                                                            src1_stride,
                                                            mask,
                                                            mask_stride,
                                                            h,
                                                            &v_round_offset,
                                                            shift,
                                                            &clip_low,
                                                            &clip_high,
                                                            &mask_max);
            break;
        default: // >=16
            highbd_blend_a64_d16_mask_subw1_subh1_w16_sse4_1(dst,
                                                             dst_stride,
                                                             src0,
                                                             src0_stride,
                                                             src1,
                                                             src1_stride,
                                                             mask,
                                                             mask_stride,
                                                             h,
                                                             w,
                                                             &v_round_offset,
                                                             shift,
                                                             &clip_low,
                                                             &clip_high,
                                                             &mask_max);
            break;
        }
    } else {
        // Sub-sampling in only one axis doesn't seem to happen very much, so fall
        // back to the vanilla C implementation instead of having all the optimised
        // code for these.
        svt_aom_highbd_blend_a64_d16_mask_c(dst8,
                                            dst_stride,
                                            src0,
                                            src0_stride,
                                            src1,
                                            src1_stride,
                                            mask,
                                            mask_stride,
                                            w,
                                            h,
                                            subw,
                                            subh,
                                            conv_params,
                                            bd);
    }
}

static INLINE void blend_a64_d16_mask_w16_sse41(uint8_t *dst, const CONV_BUF_TYPE *src0,
                                                const CONV_BUF_TYPE *src1, const __m128i *m0,
                                                const __m128i *m1, const __m128i *v_round_offset,
                                                const __m128i *v_maxval, int shift) {
    const __m128i max_minus_m0 = _mm_sub_epi16(*v_maxval, *m0);
    const __m128i max_minus_m1 = _mm_sub_epi16(*v_maxval, *m1);
    const __m128i s0_0         = xx_loadu_128(src0);
    const __m128i s0_1         = xx_loadu_128(src0 + 8);
    const __m128i s1_0         = xx_loadu_128(src1);
    const __m128i s1_1         = xx_loadu_128(src1 + 8);
    __m128i       res0_lo      = _mm_madd_epi16(_mm_unpacklo_epi16(s0_0, s1_0),
                                     _mm_unpacklo_epi16(*m0, max_minus_m0));
    __m128i       res0_hi      = _mm_madd_epi16(_mm_unpackhi_epi16(s0_0, s1_0),
                                     _mm_unpackhi_epi16(*m0, max_minus_m0));
    __m128i       res1_lo      = _mm_madd_epi16(_mm_unpacklo_epi16(s0_1, s1_1),
                                     _mm_unpacklo_epi16(*m1, max_minus_m1));
    __m128i       res1_hi      = _mm_madd_epi16(_mm_unpackhi_epi16(s0_1, s1_1),
                                     _mm_unpackhi_epi16(*m1, max_minus_m1));
    res0_lo                    = _mm_srai_epi32(_mm_sub_epi32(res0_lo, *v_round_offset), shift);
    res0_hi                    = _mm_srai_epi32(_mm_sub_epi32(res0_hi, *v_round_offset), shift);
    res1_lo                    = _mm_srai_epi32(_mm_sub_epi32(res1_lo, *v_round_offset), shift);
    res1_hi                    = _mm_srai_epi32(_mm_sub_epi32(res1_hi, *v_round_offset), shift);
    const __m128i res0         = _mm_packs_epi32(res0_lo, res0_hi);
    const __m128i res1         = _mm_packs_epi32(res1_lo, res1_hi);
    const __m128i res          = _mm_packus_epi16(res0, res1);

    _mm_storeu_si128((__m128i *)(dst), res);
}

static INLINE void lowbd_blend_a64_d16_mask_subw0_subh0_w16_sse4_1(
    uint8_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, int w, const __m128i *round_offset, int shift) {
    const __m128i v_maxval = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);
    for (int i = 0; i < h; ++i) {
        for (int j = 0; j < w; j += 16) {
            const __m128i m  = xx_loadu_128(mask + j);
            const __m128i m0 = _mm_cvtepu8_epi16(m);
            const __m128i m1 = _mm_cvtepu8_epi16(_mm_srli_si128(m, 8));

            blend_a64_d16_mask_w16_sse41(
                dst + j, src0 + j, src1 + j, &m0, &m1, round_offset, &v_maxval, shift);
        }
        mask += mask_stride;
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
    }
}

static INLINE void lowbd_blend_a64_d16_mask_subw1_subh1_w16_sse4_1(
    uint8_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, int w, const __m128i *round_offset, int shift) {
    const __m128i v_maxval = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i one_b    = _mm_set1_epi8(1);
    const __m128i two_w    = _mm_set1_epi16(2);
    for (int i = 0; i < h; ++i) {
        for (int j = 0; j < w; j += 16) {
            const __m128i m_i00 = xx_loadu_128(mask + 2 * j);
            const __m128i m_i01 = xx_loadu_128(mask + 2 * j + 16);
            const __m128i m_i10 = xx_loadu_128(mask + mask_stride + 2 * j);
            const __m128i m_i11 = xx_loadu_128(mask + mask_stride + 2 * j + 16);

            const __m128i m0_ac   = _mm_adds_epu8(m_i00, m_i10);
            const __m128i m1_ac   = _mm_adds_epu8(m_i01, m_i11);
            const __m128i m0_acbd = _mm_maddubs_epi16(m0_ac, one_b);
            const __m128i m1_acbd = _mm_maddubs_epi16(m1_ac, one_b);
            const __m128i m0      = _mm_srli_epi16(_mm_add_epi16(m0_acbd, two_w), 2);
            const __m128i m1      = _mm_srli_epi16(_mm_add_epi16(m1_acbd, two_w), 2);

            blend_a64_d16_mask_w16_sse41(
                dst + j, src0 + j, src1 + j, &m0, &m1, round_offset, &v_maxval, shift);
        }
        mask += mask_stride << 1;
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
    }
}

static INLINE void lowbd_blend_a64_d16_mask_subw1_subh0_w16_sse4_1(
    uint8_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, int w, const __m128i *round_offset, int shift) {
    const __m128i v_maxval = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i one_b    = _mm_set1_epi8(1);
    const __m128i zeros    = _mm_setzero_si128();
    for (int i = 0; i < h; ++i) {
        for (int j = 0; j < w; j += 16) {
            const __m128i m_i00 = xx_loadu_128(mask + 2 * j);
            const __m128i m_i01 = xx_loadu_128(mask + 2 * j + 16);
            const __m128i m0_ac = _mm_maddubs_epi16(m_i00, one_b);
            const __m128i m1_ac = _mm_maddubs_epi16(m_i01, one_b);
            const __m128i m0    = _mm_avg_epu16(m0_ac, zeros);
            const __m128i m1    = _mm_avg_epu16(m1_ac, zeros);

            blend_a64_d16_mask_w16_sse41(
                dst + j, src0 + j, src1 + j, &m0, &m1, round_offset, &v_maxval, shift);
        }
        mask += mask_stride;
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
    }
}

static INLINE void lowbd_blend_a64_d16_mask_subw0_subh1_w16_sse4_1(
    uint8_t *dst, uint32_t dst_stride, const CONV_BUF_TYPE *src0, uint32_t src0_stride,
    const CONV_BUF_TYPE *src1, uint32_t src1_stride, const uint8_t *mask, uint32_t mask_stride,
    int h, int w, const __m128i *round_offset, int shift) {
    const __m128i v_maxval = _mm_set1_epi16(AOM_BLEND_A64_MAX_ALPHA);
    const __m128i zeros    = _mm_setzero_si128();
    for (int i = 0; i < h; ++i) {
        for (int j = 0; j < w; j += 16) {
            const __m128i m_i00 = xx_loadu_128(mask + j);
            const __m128i m_i10 = xx_loadu_128(mask + mask_stride + j);

            const __m128i m_ac = _mm_avg_epu8(_mm_adds_epu8(m_i00, m_i10), zeros);
            const __m128i m0   = _mm_cvtepu8_epi16(m_ac);
            const __m128i m1   = _mm_cvtepu8_epi16(_mm_srli_si128(m_ac, 8));

            blend_a64_d16_mask_w16_sse41(
                dst + j, src0 + j, src1 + j, &m0, &m1, round_offset, &v_maxval, shift);
        }
        mask += mask_stride << 1;
        dst += dst_stride;
        src0 += src0_stride;
        src1 += src1_stride;
    }
}

void svt_aom_lowbd_blend_a64_d16_mask_sse4_1(uint8_t *dst, uint32_t dst_stride,
                                             const CONV_BUF_TYPE *src0, uint32_t src0_stride,
                                             const CONV_BUF_TYPE *src1, uint32_t src1_stride,
                                             const uint8_t *mask, uint32_t mask_stride, int w,
                                             int h, int subw, int subh,
                                             ConvolveParams *conv_params) {
    const int bd         = 8;
    const int round_bits = 2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;

    const int round_offset =
        ((1 << (round_bits + bd)) + (1 << (round_bits + bd - 1)) - (1 << (round_bits - 1)))
        << AOM_BLEND_A64_ROUND_BITS;

    const int shift = round_bits + AOM_BLEND_A64_ROUND_BITS;
    assert(IMPLIES((void *)src0 == dst, src0_stride == dst_stride));
    assert(IMPLIES((void *)src1 == dst, src1_stride == dst_stride));

    assert(h >= 4);
    assert(w >= 4);
    assert(IS_POWER_OF_TWO(h));
    assert(IS_POWER_OF_TWO(w));

    const __m128i v_round_offset = _mm_set1_epi32(round_offset);

    if (subw == 0 && subh == 0) {
        switch (w) {
        case 4:
            aom_lowbd_blend_a64_d16_mask_subw0_subh0_w4_sse4_1(dst,
                                                               dst_stride,
                                                               src0,
                                                               src0_stride,
                                                               src1,
                                                               src1_stride,
                                                               mask,
                                                               mask_stride,
                                                               h,
                                                               &v_round_offset,
                                                               shift);
            break;
        case 8:
            aom_lowbd_blend_a64_d16_mask_subw0_subh0_w8_sse4_1(dst,
                                                               dst_stride,
                                                               src0,
                                                               src0_stride,
                                                               src1,
                                                               src1_stride,
                                                               mask,
                                                               mask_stride,
                                                               h,
                                                               &v_round_offset,
                                                               shift);
            break;
        default:
            lowbd_blend_a64_d16_mask_subw0_subh0_w16_sse4_1(dst,
                                                            dst_stride,
                                                            src0,
                                                            src0_stride,
                                                            src1,
                                                            src1_stride,
                                                            mask,
                                                            mask_stride,
                                                            h,
                                                            w,
                                                            &v_round_offset,
                                                            shift);
            break;
        }

    } else if (subw == 1 && subh == 1) {
        switch (w) {
        case 4:
            aom_lowbd_blend_a64_d16_mask_subw1_subh1_w4_sse4_1(dst,
                                                               dst_stride,
                                                               src0,
                                                               src0_stride,
                                                               src1,
                                                               src1_stride,
                                                               mask,
                                                               mask_stride,
                                                               h,
                                                               &v_round_offset,
                                                               shift);
            break;
        case 8:
            aom_lowbd_blend_a64_d16_mask_subw1_subh1_w8_sse4_1(dst,
                                                               dst_stride,
                                                               src0,
                                                               src0_stride,
                                                               src1,
                                                               src1_stride,
                                                               mask,
                                                               mask_stride,
                                                               h,
                                                               &v_round_offset,
                                                               shift);
            break;
        default:
            lowbd_blend_a64_d16_mask_subw1_subh1_w16_sse4_1(dst,
                                                            dst_stride,
                                                            src0,
                                                            src0_stride,
                                                            src1,
                                                            src1_stride,
                                                            mask,
                                                            mask_stride,
                                                            h,
                                                            w,
                                                            &v_round_offset,
                                                            shift);
            break;
        }
    } else if (subw == 1 && subh == 0) {
        switch (w) {
        case 4:
            aom_lowbd_blend_a64_d16_mask_subw1_subh0_w4_sse4_1(dst,
                                                               dst_stride,
                                                               src0,
                                                               src0_stride,
                                                               src1,
                                                               src1_stride,
                                                               mask,
                                                               mask_stride,
                                                               h,
                                                               &v_round_offset,
                                                               shift);
            break;
        case 8:
            aom_lowbd_blend_a64_d16_mask_subw1_subh0_w8_sse4_1(dst,
                                                               dst_stride,
                                                               src0,
                                                               src0_stride,
                                                               src1,
                                                               src1_stride,
                                                               mask,
                                                               mask_stride,
                                                               h,
                                                               &v_round_offset,
                                                               shift);
            break;
        default:
            lowbd_blend_a64_d16_mask_subw1_subh0_w16_sse4_1(dst,
                                                            dst_stride,
                                                            src0,
                                                            src0_stride,
                                                            src1,
                                                            src1_stride,
                                                            mask,
                                                            mask_stride,
                                                            h,
                                                            w,
                                                            &v_round_offset,
                                                            shift);
            break;
        }
    } else {
        switch (w) {
        case 4:
            aom_lowbd_blend_a64_d16_mask_subw0_subh1_w4_sse4_1(dst,
                                                               dst_stride,
                                                               src0,
                                                               src0_stride,
                                                               src1,
                                                               src1_stride,
                                                               mask,
                                                               mask_stride,
                                                               h,
                                                               &v_round_offset,
                                                               shift);
            break;
        case 8:
            aom_lowbd_blend_a64_d16_mask_subw0_subh1_w8_sse4_1(dst,
                                                               dst_stride,
                                                               src0,
                                                               src0_stride,
                                                               src1,
                                                               src1_stride,
                                                               mask,
                                                               mask_stride,
                                                               h,
                                                               &v_round_offset,
                                                               shift);
            break;
        default:
            lowbd_blend_a64_d16_mask_subw0_subh1_w16_sse4_1(dst,
                                                            dst_stride,
                                                            src0,
                                                            src0_stride,
                                                            src1,
                                                            src1_stride,
                                                            mask,
                                                            mask_stride,
                                                            h,
                                                            w,
                                                            &v_round_offset,
                                                            shift);
            break;
        }
    }
}
