itx_1d.c 32.8 KB
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/*
 * Copyright © 2018, VideoLAN and dav1d authors
 * Copyright © 2018, Two Orioles, LLC
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#include <stddef.h>
#include <stdint.h>

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#include "common/attributes.h"

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#define CLIP(a) iclip(a, min, max)

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static void NOINLINE
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inv_dct4_1d(const coef *const in, const ptrdiff_t in_s,
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            coef *const out, const ptrdiff_t out_s, const int max)
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{
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    const int min = -max - 1;
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    const int in0 = in[0 * in_s], in1 = in[1 * in_s];
    const int in2 = in[2 * in_s], in3 = in[3 * in_s];

    int t0 = ((in0 + in2) * 2896 + 2048) >> 12;
    int t1 = ((in0 - in2) * 2896 + 2048) >> 12;
    int t2 = (in1 * 1567 - in3 * 3784 + 2048) >> 12;
    int t3 = (in1 * 3784 + in3 * 1567 + 2048) >> 12;

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    out[0 * out_s] = CLIP(t0 + t3);
    out[1 * out_s] = CLIP(t1 + t2);
    out[2 * out_s] = CLIP(t1 - t2);
    out[3 * out_s] = CLIP(t0 - t3);
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}

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static void NOINLINE
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inv_dct8_1d(const coef *const in, const ptrdiff_t in_s,
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            coef *const out, const ptrdiff_t out_s, const int max)
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{
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    const int min = -max - 1;
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    coef tmp[4];

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    inv_dct4_1d(in, in_s * 2, tmp, 1, max);
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    const int in1 = in[1 * in_s], in3 = in[3 * in_s];
    const int in5 = in[5 * in_s], in7 = in[7 * in_s];

    int t4a = (in1 *  799 - in7 * 4017 + 2048) >> 12;
    int t5a = (in5 * 3406 - in3 * 2276 + 2048) >> 12;
    int t6a = (in5 * 2276 + in3 * 3406 + 2048) >> 12;
    int t7a = (in1 * 4017 + in7 *  799 + 2048) >> 12;

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    int t4  = CLIP(t4a + t5a);
        t5a = CLIP(t4a - t5a);
    int t7  = CLIP(t7a + t6a);
        t6a = CLIP(t7a - t6a);
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    int t5  = ((t6a - t5a) * 2896 + 2048) >> 12;
    int t6  = ((t6a + t5a) * 2896 + 2048) >> 12;

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    out[0 * out_s] = CLIP(tmp[0] + t7);
    out[1 * out_s] = CLIP(tmp[1] + t6);
    out[2 * out_s] = CLIP(tmp[2] + t5);
    out[3 * out_s] = CLIP(tmp[3] + t4);
    out[4 * out_s] = CLIP(tmp[3] - t4);
    out[5 * out_s] = CLIP(tmp[2] - t5);
    out[6 * out_s] = CLIP(tmp[1] - t6);
    out[7 * out_s] = CLIP(tmp[0] - t7);
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}

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static void NOINLINE
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inv_dct16_1d(const coef *const in, const ptrdiff_t in_s,
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             coef *const out, const ptrdiff_t out_s, const int max)
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{
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    const int min = -max - 1;
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    coef tmp[8];

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    inv_dct8_1d(in, in_s * 2, tmp, 1, max);
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    const int in1  = in[ 1 * in_s], in3  = in[ 3 * in_s];
    const int in5  = in[ 5 * in_s], in7  = in[ 7 * in_s];
    const int in9  = in[ 9 * in_s], in11 = in[11 * in_s];
    const int in13 = in[13 * in_s], in15 = in[15 * in_s];

    int t8a  = (in1  *  401 - in15 * 4076 + 2048) >> 12;
    int t15a = (in1  * 4076 + in15 *  401 + 2048) >> 12;
    int t9a  = (in9  * 3166 - in7  * 2598 + 2048) >> 12;
    int t14a = (in9  * 2598 + in7  * 3166 + 2048) >> 12;
    int t10a = (in5  * 1931 - in11 * 3612 + 2048) >> 12;
    int t13a = (in5  * 3612 + in11 * 1931 + 2048) >> 12;
    int t11a = (in13 * 3920 - in3  * 1189 + 2048) >> 12;
    int t12a = (in13 * 1189 + in3  * 3920 + 2048) >> 12;

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    int t8  = CLIP(t8a  + t9a);
    int t9  = CLIP(t8a  - t9a);
    int t10 = CLIP(t11a - t10a);
    int t11 = CLIP(t11a + t10a);
    int t12 = CLIP(t12a + t13a);
    int t13 = CLIP(t12a - t13a);
    int t14 = CLIP(t15a - t14a);
    int t15 = CLIP(t15a + t14a);
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    t9a  = (  t14 * 1567 - t9  * 3784  + 2048) >> 12;
    t14a = (  t14 * 3784 + t9  * 1567  + 2048) >> 12;
    t10a = (-(t13 * 3784 + t10 * 1567) + 2048) >> 12;
    t13a = (  t13 * 1567 - t10 * 3784  + 2048) >> 12;

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    t8a  = CLIP(t8   + t11);
    t9   = CLIP(t9a  + t10a);
    t10  = CLIP(t9a  - t10a);
    t11a = CLIP(t8   - t11);
    t12a = CLIP(t15  - t12);
    t13  = CLIP(t14a - t13a);
    t14  = CLIP(t14a + t13a);
    t15a = CLIP(t15  + t12);
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    t10a = ((t13  - t10)  * 2896 + 2048) >> 12;
    t13a = ((t13  + t10)  * 2896 + 2048) >> 12;
    t11  = ((t12a - t11a) * 2896 + 2048) >> 12;
    t12  = ((t12a + t11a) * 2896 + 2048) >> 12;

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    out[ 0 * out_s] = CLIP(tmp[0] + t15a);
    out[ 1 * out_s] = CLIP(tmp[1] + t14);
    out[ 2 * out_s] = CLIP(tmp[2] + t13a);
    out[ 3 * out_s] = CLIP(tmp[3] + t12);
    out[ 4 * out_s] = CLIP(tmp[4] + t11);
    out[ 5 * out_s] = CLIP(tmp[5] + t10a);
    out[ 6 * out_s] = CLIP(tmp[6] + t9);
    out[ 7 * out_s] = CLIP(tmp[7] + t8a);
    out[ 8 * out_s] = CLIP(tmp[7] - t8a);
    out[ 9 * out_s] = CLIP(tmp[6] - t9);
    out[10 * out_s] = CLIP(tmp[5] - t10a);
    out[11 * out_s] = CLIP(tmp[4] - t11);
    out[12 * out_s] = CLIP(tmp[3] - t12);
    out[13 * out_s] = CLIP(tmp[2] - t13a);
    out[14 * out_s] = CLIP(tmp[1] - t14);
    out[15 * out_s] = CLIP(tmp[0] - t15a);
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}

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static void NOINLINE
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inv_dct32_1d(const coef *const in, const ptrdiff_t in_s,
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             coef *const out, const ptrdiff_t out_s, const int max)
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{
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    const int min = -max - 1;
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    coef tmp[16];

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    inv_dct16_1d(in, in_s * 2, tmp, 1, max);
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    const int in1  = in[ 1 * in_s], in3  = in[ 3 * in_s];
    const int in5  = in[ 5 * in_s], in7  = in[ 7 * in_s];
    const int in9  = in[ 9 * in_s], in11 = in[11 * in_s];
    const int in13 = in[13 * in_s], in15 = in[15 * in_s];
    const int in17 = in[17 * in_s], in19 = in[19 * in_s];
    const int in21 = in[21 * in_s], in23 = in[23 * in_s];
    const int in25 = in[25 * in_s], in27 = in[27 * in_s];
    const int in29 = in[29 * in_s], in31 = in[31 * in_s];

    int t16a = (in1  *  201 - in31 * 4091 + 2048) >> 12;
    int t31a = (in1  * 4091 + in31 *  201 + 2048) >> 12;
    int t17a = (in17 * 3035 - in15 * 2751 + 2048) >> 12;
    int t30a = (in17 * 2751 + in15 * 3035 + 2048) >> 12;
    int t18a = (in9  * 1751 - in23 * 3703 + 2048) >> 12;
    int t29a = (in9  * 3703 + in23 * 1751 + 2048) >> 12;
    int t19a = (in25 * 3857 - in7  * 1380 + 2048) >> 12;
    int t28a = (in25 * 1380 + in7  * 3857 + 2048) >> 12;
    int t20a = (in5  *  995 - in27 * 3973 + 2048) >> 12;
    int t27a = (in5  * 3973 + in27 *  995 + 2048) >> 12;
    int t21a = (in21 * 3513 - in11 * 2106 + 2048) >> 12;
    int t26a = (in21 * 2106 + in11 * 3513 + 2048) >> 12;
    int t22a = (in13 * 2440 - in19 * 3290 + 2048) >> 12;
    int t25a = (in13 * 3290 + in19 * 2440 + 2048) >> 12;
    int t23a = (in29 * 4052 - in3  *  601 + 2048) >> 12;
    int t24a = (in29 *  601 + in3  * 4052 + 2048) >> 12;

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    int t16 = CLIP(t16a + t17a);
    int t17 = CLIP(t16a - t17a);
    int t18 = CLIP(t19a - t18a);
    int t19 = CLIP(t19a + t18a);
    int t20 = CLIP(t20a + t21a);
    int t21 = CLIP(t20a - t21a);
    int t22 = CLIP(t23a - t22a);
    int t23 = CLIP(t23a + t22a);
    int t24 = CLIP(t24a + t25a);
    int t25 = CLIP(t24a - t25a);
    int t26 = CLIP(t27a - t26a);
    int t27 = CLIP(t27a + t26a);
    int t28 = CLIP(t28a + t29a);
    int t29 = CLIP(t28a - t29a);
    int t30 = CLIP(t31a - t30a);
    int t31 = CLIP(t31a + t30a);
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    t17a = (  t30 *  799 - t17 * 4017  + 2048) >> 12;
    t30a = (  t30 * 4017 + t17 *  799  + 2048) >> 12;
    t18a = (-(t29 * 4017 + t18 *  799) + 2048) >> 12;
    t29a = (  t29 *  799 - t18 * 4017  + 2048) >> 12;
    t21a = (  t26 * 3406 - t21 * 2276  + 2048) >> 12;
    t26a = (  t26 * 2276 + t21 * 3406  + 2048) >> 12;
    t22a = (-(t25 * 2276 + t22 * 3406) + 2048) >> 12;
    t25a = (  t25 * 3406 - t22 * 2276  + 2048) >> 12;

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    t16a = CLIP(t16  + t19);
    t17  = CLIP(t17a + t18a);
    t18  = CLIP(t17a - t18a);
    t19a = CLIP(t16  - t19);
    t20a = CLIP(t23  - t20);
    t21  = CLIP(t22a - t21a);
    t22  = CLIP(t22a + t21a);
    t23a = CLIP(t23  + t20);
    t24a = CLIP(t24  + t27);
    t25  = CLIP(t25a + t26a);
    t26  = CLIP(t25a - t26a);
    t27a = CLIP(t24  - t27);
    t28a = CLIP(t31  - t28);
    t29  = CLIP(t30a - t29a);
    t30  = CLIP(t30a + t29a);
    t31a = CLIP(t31  + t28);
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    t18a = (  t29  * 1567 - t18  * 3784  + 2048) >> 12;
    t29a = (  t29  * 3784 + t18  * 1567  + 2048) >> 12;
    t19  = (  t28a * 1567 - t19a * 3784  + 2048) >> 12;
    t28  = (  t28a * 3784 + t19a * 1567  + 2048) >> 12;
    t20  = (-(t27a * 3784 + t20a * 1567) + 2048) >> 12;
    t27  = (  t27a * 1567 - t20a * 3784  + 2048) >> 12;
    t21a = (-(t26  * 3784 + t21  * 1567) + 2048) >> 12;
    t26a = (  t26  * 1567 - t21  * 3784  + 2048) >> 12;

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    t16  = CLIP(t16a + t23a);
    t17a = CLIP(t17  + t22);
    t18  = CLIP(t18a + t21a);
    t19a = CLIP(t19  + t20);
    t20a = CLIP(t19  - t20);
    t21  = CLIP(t18a - t21a);
    t22a = CLIP(t17  - t22);
    t23  = CLIP(t16a - t23a);
    t24  = CLIP(t31a - t24a);
    t25a = CLIP(t30  - t25);
    t26  = CLIP(t29a - t26a);
    t27a = CLIP(t28  - t27);
    t28a = CLIP(t28  + t27);
    t29  = CLIP(t29a + t26a);
    t30a = CLIP(t30  + t25);
    t31  = CLIP(t31a + t24a);
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    t20  = ((t27a - t20a) * 2896 + 2048) >> 12;
    t27  = ((t27a + t20a) * 2896 + 2048) >> 12;
    t21a = ((t26  - t21 ) * 2896 + 2048) >> 12;
    t26a = ((t26  + t21 ) * 2896 + 2048) >> 12;
    t22  = ((t25a - t22a) * 2896 + 2048) >> 12;
    t25  = ((t25a + t22a) * 2896 + 2048) >> 12;
    t23a = ((t24  - t23 ) * 2896 + 2048) >> 12;
    t24a = ((t24  + t23 ) * 2896 + 2048) >> 12;

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    out[ 0 * out_s] = CLIP(tmp[ 0] + t31);
    out[ 1 * out_s] = CLIP(tmp[ 1] + t30a);
    out[ 2 * out_s] = CLIP(tmp[ 2] + t29);
    out[ 3 * out_s] = CLIP(tmp[ 3] + t28a);
    out[ 4 * out_s] = CLIP(tmp[ 4] + t27);
    out[ 5 * out_s] = CLIP(tmp[ 5] + t26a);
    out[ 6 * out_s] = CLIP(tmp[ 6] + t25);
    out[ 7 * out_s] = CLIP(tmp[ 7] + t24a);
    out[ 8 * out_s] = CLIP(tmp[ 8] + t23a);
    out[ 9 * out_s] = CLIP(tmp[ 9] + t22);
    out[10 * out_s] = CLIP(tmp[10] + t21a);
    out[11 * out_s] = CLIP(tmp[11] + t20);
    out[12 * out_s] = CLIP(tmp[12] + t19a);
    out[13 * out_s] = CLIP(tmp[13] + t18);
    out[14 * out_s] = CLIP(tmp[14] + t17a);
    out[15 * out_s] = CLIP(tmp[15] + t16);
    out[16 * out_s] = CLIP(tmp[15] - t16);
    out[17 * out_s] = CLIP(tmp[14] - t17a);
    out[18 * out_s] = CLIP(tmp[13] - t18);
    out[19 * out_s] = CLIP(tmp[12] - t19a);
    out[20 * out_s] = CLIP(tmp[11] - t20);
    out[21 * out_s] = CLIP(tmp[10] - t21a);
    out[22 * out_s] = CLIP(tmp[ 9] - t22);
    out[23 * out_s] = CLIP(tmp[ 8] - t23a);
    out[24 * out_s] = CLIP(tmp[ 7] - t24a);
    out[25 * out_s] = CLIP(tmp[ 6] - t25);
    out[26 * out_s] = CLIP(tmp[ 5] - t26a);
    out[27 * out_s] = CLIP(tmp[ 4] - t27);
    out[28 * out_s] = CLIP(tmp[ 3] - t28a);
    out[29 * out_s] = CLIP(tmp[ 2] - t29);
    out[30 * out_s] = CLIP(tmp[ 1] - t30a);
    out[31 * out_s] = CLIP(tmp[ 0] - t31);
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}

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static void NOINLINE
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inv_dct64_1d(const coef *const in, const ptrdiff_t in_s,
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             coef *const out, const ptrdiff_t out_s, const int max)
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{
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    const int min = -max - 1;
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    coef tmp[32];

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    inv_dct32_1d(in, in_s * 2, tmp, 1, max);
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    const int in1  = in[ 1 * in_s], in3  = in[ 3 * in_s];
    const int in5  = in[ 5 * in_s], in7  = in[ 7 * in_s];
    const int in9  = in[ 9 * in_s], in11 = in[11 * in_s];
    const int in13 = in[13 * in_s], in15 = in[15 * in_s];
    const int in17 = in[17 * in_s], in19 = in[19 * in_s];
    const int in21 = in[21 * in_s], in23 = in[23 * in_s];
    const int in25 = in[25 * in_s], in27 = in[27 * in_s];
    const int in29 = in[29 * in_s], in31 = in[31 * in_s];
    const int in33 = in[33 * in_s], in35 = in[35 * in_s];
    const int in37 = in[37 * in_s], in39 = in[39 * in_s];
    const int in41 = in[41 * in_s], in43 = in[43 * in_s];
    const int in45 = in[45 * in_s], in47 = in[47 * in_s];
    const int in49 = in[49 * in_s], in51 = in[51 * in_s];
    const int in53 = in[53 * in_s], in55 = in[55 * in_s];
    const int in57 = in[57 * in_s], in59 = in[59 * in_s];
    const int in61 = in[61 * in_s], in63 = in[63 * in_s];

    int t32a = (in1  *  101 - in63 * 4095 + 2048) >> 12;
    int t33a = (in33 * 2967 - in31 * 2824 + 2048) >> 12;
    int t34a = (in17 * 1660 - in47 * 3745 + 2048) >> 12;
    int t35a = (in49 * 3822 - in15 * 1474 + 2048) >> 12;
    int t36a = (in9  *  897 - in55 * 3996 + 2048) >> 12;
    int t37a = (in41 * 3461 - in23 * 2191 + 2048) >> 12;
    int t38a = (in25 * 2359 - in39 * 3349 + 2048) >> 12;
    int t39a = (in57 * 4036 - in7  *  700 + 2048) >> 12;
    int t40a = (in5  *  501 - in59 * 4065 + 2048) >> 12;
    int t41a = (in37 * 3229 - in27 * 2520 + 2048) >> 12;
    int t42a = (in21 * 2019 - in43 * 3564 + 2048) >> 12;
    int t43a = (in53 * 3948 - in11 * 1092 + 2048) >> 12;
    int t44a = (in13 * 1285 - in51 * 3889 + 2048) >> 12;
    int t45a = (in45 * 3659 - in19 * 1842 + 2048) >> 12;
    int t46a = (in29 * 2675 - in35 * 3102 + 2048) >> 12;
    int t47a = (in61 * 4085 - in3  *  301 + 2048) >> 12;
    int t48a = (in61 *  301 + in3  * 4085 + 2048) >> 12;
    int t49a = (in29 * 3102 + in35 * 2675 + 2048) >> 12;
    int t50a = (in45 * 1842 + in19 * 3659 + 2048) >> 12;
    int t51a = (in13 * 3889 + in51 * 1285 + 2048) >> 12;
    int t52a = (in53 * 1092 + in11 * 3948 + 2048) >> 12;
    int t53a = (in21 * 3564 + in43 * 2019 + 2048) >> 12;
    int t54a = (in37 * 2520 + in27 * 3229 + 2048) >> 12;
    int t55a = (in5  * 4065 + in59 *  501 + 2048) >> 12;
    int t56a = (in57 *  700 + in7  * 4036 + 2048) >> 12;
    int t57a = (in25 * 3349 + in39 * 2359 + 2048) >> 12;
    int t58a = (in41 * 2191 + in23 * 3461 + 2048) >> 12;
    int t59a = (in9  * 3996 + in55 *  897 + 2048) >> 12;
    int t60a = (in49 * 1474 + in15 * 3822 + 2048) >> 12;
    int t61a = (in17 * 3745 + in47 * 1660 + 2048) >> 12;
    int t62a = (in33 * 2824 + in31 * 2967 + 2048) >> 12;
    int t63a = (in1  * 4095 + in63 *  101 + 2048) >> 12;

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    int t32 = CLIP(t32a + t33a);
    int t33 = CLIP(t32a - t33a);
    int t34 = CLIP(t35a - t34a);
    int t35 = CLIP(t35a + t34a);
    int t36 = CLIP(t36a + t37a);
    int t37 = CLIP(t36a - t37a);
    int t38 = CLIP(t39a - t38a);
    int t39 = CLIP(t39a + t38a);
    int t40 = CLIP(t40a + t41a);
    int t41 = CLIP(t40a - t41a);
    int t42 = CLIP(t43a - t42a);
    int t43 = CLIP(t43a + t42a);
    int t44 = CLIP(t44a + t45a);
    int t45 = CLIP(t44a - t45a);
    int t46 = CLIP(t47a - t46a);
    int t47 = CLIP(t47a + t46a);
    int t48 = CLIP(t48a + t49a);
    int t49 = CLIP(t48a - t49a);
    int t50 = CLIP(t51a - t50a);
    int t51 = CLIP(t51a + t50a);
    int t52 = CLIP(t52a + t53a);
    int t53 = CLIP(t52a - t53a);
    int t54 = CLIP(t55a - t54a);
    int t55 = CLIP(t55a + t54a);
    int t56 = CLIP(t56a + t57a);
    int t57 = CLIP(t56a - t57a);
    int t58 = CLIP(t59a - t58a);
    int t59 = CLIP(t59a + t58a);
    int t60 = CLIP(t60a + t61a);
    int t61 = CLIP(t60a - t61a);
    int t62 = CLIP(t63a - t62a);
    int t63 = CLIP(t63a + t62a);
398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415

    t33a = (t33 * -4076 + t62 *   401 + 2048) >> 12;
    t34a = (t34 * - 401 + t61 * -4076 + 2048) >> 12;
    t37a = (t37 * -2598 + t58 *  3166 + 2048) >> 12;
    t38a = (t38 * -3166 + t57 * -2598 + 2048) >> 12;
    t41a = (t41 * -3612 + t54 *  1931 + 2048) >> 12;
    t42a = (t42 * -1931 + t53 * -3612 + 2048) >> 12;
    t45a = (t45 * -1189 + t50 *  3920 + 2048) >> 12;
    t46a = (t46 * -3920 + t49 * -1189 + 2048) >> 12;
    t49a = (t46 * -1189 + t49 *  3920 + 2048) >> 12;
    t50a = (t45 *  3920 + t50 *  1189 + 2048) >> 12;
    t53a = (t42 * -3612 + t53 *  1931 + 2048) >> 12;
    t54a = (t41 *  1931 + t54 *  3612 + 2048) >> 12;
    t57a = (t38 * -2598 + t57 *  3166 + 2048) >> 12;
    t58a = (t37 *  3166 + t58 *  2598 + 2048) >> 12;
    t61a = (t34 * -4076 + t61 *   401 + 2048) >> 12;
    t62a = (t33 *   401 + t62 *  4076 + 2048) >> 12;

416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447
    t32a = CLIP(t32  + t35);
    t33  = CLIP(t33a + t34a);
    t34  = CLIP(t33a - t34a);
    t35a = CLIP(t32  - t35);
    t36a = CLIP(t39  - t36);
    t37  = CLIP(t38a - t37a);
    t38  = CLIP(t38a + t37a);
    t39a = CLIP(t39  + t36);
    t40a = CLIP(t40  + t43);
    t41  = CLIP(t41a + t42a);
    t42  = CLIP(t41a - t42a);
    t43a = CLIP(t40  - t43);
    t44a = CLIP(t47  - t44);
    t45  = CLIP(t46a - t45a);
    t46  = CLIP(t46a + t45a);
    t47a = CLIP(t47  + t44);
    t48a = CLIP(t48  + t51);
    t49  = CLIP(t49a + t50a);
    t50  = CLIP(t49a - t50a);
    t51a = CLIP(t48  - t51);
    t52a = CLIP(t55  - t52);
    t53  = CLIP(t54a - t53a);
    t54  = CLIP(t54a + t53a);
    t55a = CLIP(t55  + t52);
    t56a = CLIP(t56  + t59);
    t57  = CLIP(t57a + t58a);
    t58  = CLIP(t57a - t58a);
    t59a = CLIP(t56  - t59);
    t60a = CLIP(t63  - t60);
    t61  = CLIP(t62a - t61a);
    t62  = CLIP(t62a + t61a);
    t63a = CLIP(t63  + t60);
448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465

    t34a = (t34  * -4017 + t61  *   799 + 2048) >> 12;
    t35  = (t35a * -4017 + t60a *   799 + 2048) >> 12;
    t36  = (t36a * - 799 + t59a * -4017 + 2048) >> 12;
    t37a = (t37  * - 799 + t58  * -4017 + 2048) >> 12;
    t42a = (t42  * -2276 + t53  *  3406 + 2048) >> 12;
    t43  = (t43a * -2276 + t52a *  3406 + 2048) >> 12;
    t44  = (t44a * -3406 + t51a * -2276 + 2048) >> 12;
    t45a = (t45  * -3406 + t50  * -2276 + 2048) >> 12;
    t50a = (t45  * -2276 + t50  *  3406 + 2048) >> 12;
    t51  = (t44a * -2276 + t51a *  3406 + 2048) >> 12;
    t52  = (t43a *  3406 + t52a *  2276 + 2048) >> 12;
    t53a = (t42  *  3406 + t53  *  2276 + 2048) >> 12;
    t58a = (t37  * -4017 + t58  *   799 + 2048) >> 12;
    t59  = (t36a * -4017 + t59a *   799 + 2048) >> 12;
    t60  = (t35a *   799 + t60a *  4017 + 2048) >> 12;
    t61a = (t34  *   799 + t61  *  4017 + 2048) >> 12;

466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497
    t32  = CLIP(t32a + t39a);
    t33a = CLIP(t33  + t38);
    t34  = CLIP(t34a + t37a);
    t35a = CLIP(t35  + t36);
    t36a = CLIP(t35  - t36);
    t37  = CLIP(t34a - t37a);
    t38a = CLIP(t33  - t38);
    t39  = CLIP(t32a - t39a);
    t40  = CLIP(t47a - t40a);
    t41a = CLIP(t46  - t41);
    t42  = CLIP(t45a - t42a);
    t43a = CLIP(t44  - t43);
    t44a = CLIP(t44  + t43);
    t45  = CLIP(t45a + t42a);
    t46a = CLIP(t46  + t41);
    t47  = CLIP(t47a + t40a);
    t48  = CLIP(t48a + t55a);
    t49a = CLIP(t49  + t54);
    t50  = CLIP(t50a + t53a);
    t51a = CLIP(t51  + t52);
    t52a = CLIP(t51  - t52);
    t53  = CLIP(t50a - t53a);
    t54a = CLIP(t49  - t54);
    t55  = CLIP(t48a - t55a);
    t56  = CLIP(t63a - t56a);
    t57a = CLIP(t62  - t57);
    t58  = CLIP(t61a - t58a);
    t59a = CLIP(t60  - t59);
    t60a = CLIP(t60  + t59);
    t61  = CLIP(t61a + t58a);
    t62a = CLIP(t62  + t57);
    t63  = CLIP(t63a + t56a);
498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515

    t36  = (t36a * -3784 + t59a *  1567 + 2048) >> 12;
    t37a = (t37  * -3784 + t58  *  1567 + 2048) >> 12;
    t38  = (t38a * -3784 + t57a *  1567 + 2048) >> 12;
    t39a = (t39  * -3784 + t56  *  1567 + 2048) >> 12;
    t40a = (t40  * -1567 + t55  * -3784 + 2048) >> 12;
    t41  = (t41a * -1567 + t54a * -3784 + 2048) >> 12;
    t42a = (t42  * -1567 + t53  * -3784 + 2048) >> 12;
    t43  = (t43a * -1567 + t52a * -3784 + 2048) >> 12;
    t52  = (t43a * -3784 + t52a *  1567 + 2048) >> 12;
    t53a = (t42  * -3784 + t53  *  1567 + 2048) >> 12;
    t54  = (t41a * -3784 + t54a *  1567 + 2048) >> 12;
    t55a = (t40  * -3784 + t55  *  1567 + 2048) >> 12;
    t56a = (t39  *  1567 + t56  *  3784 + 2048) >> 12;
    t57  = (t38a *  1567 + t57a *  3784 + 2048) >> 12;
    t58a = (t37  *  1567 + t58  *  3784 + 2048) >> 12;
    t59  = (t36a *  1567 + t59a *  3784 + 2048) >> 12;

516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547
    t32a = CLIP(t32  + t47);
    t33  = CLIP(t33a + t46a);
    t34a = CLIP(t34  + t45);
    t35  = CLIP(t35a + t44a);
    t36a = CLIP(t36  + t43);
    t37  = CLIP(t37a + t42a);
    t38a = CLIP(t38  + t41);
    t39  = CLIP(t39a + t40a);
    t40  = CLIP(t39a - t40a);
    t41a = CLIP(t38  - t41);
    t42  = CLIP(t37a - t42a);
    t43a = CLIP(t36  - t43);
    t44  = CLIP(t35a - t44a);
    t45a = CLIP(t34  - t45);
    t46  = CLIP(t33a - t46a);
    t47a = CLIP(t32  - t47);
    t48a = CLIP(t63  - t48);
    t49  = CLIP(t62a - t49a);
    t50a = CLIP(t61  - t50);
    t51  = CLIP(t60a - t51a);
    t52a = CLIP(t59  - t52);
    t53  = CLIP(t58a - t53a);
    t54a = CLIP(t57  - t54);
    t55  = CLIP(t56a - t55a);
    t56  = CLIP(t56a + t55a);
    t57a = CLIP(t57  + t54);
    t58  = CLIP(t58a + t53a);
    t59a = CLIP(t59  + t52);
    t60  = CLIP(t60a + t51a);
    t61a = CLIP(t61  + t50);
    t62  = CLIP(t62a + t49a);
    t63a = CLIP(t63  + t48);
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565

    t40a = (t40  * -2896 + t55  * 2896 + 2048) >> 12;
    t41  = (t41a * -2896 + t54a * 2896 + 2048) >> 12;
    t42a = (t42  * -2896 + t53  * 2896 + 2048) >> 12;
    t43  = (t43a * -2896 + t52a * 2896 + 2048) >> 12;
    t44a = (t44  * -2896 + t51  * 2896 + 2048) >> 12;
    t45  = (t45a * -2896 + t50a * 2896 + 2048) >> 12;
    t46a = (t46  * -2896 + t49  * 2896 + 2048) >> 12;
    t47  = (t47a * -2896 + t48a * 2896 + 2048) >> 12;
    t48  = (t47a *  2896 + t48a * 2896 + 2048) >> 12;
    t49a = (t46  *  2896 + t49  * 2896 + 2048) >> 12;
    t50  = (t45a *  2896 + t50a * 2896 + 2048) >> 12;
    t51a = (t44  *  2896 + t51  * 2896 + 2048) >> 12;
    t52  = (t43a *  2896 + t52a * 2896 + 2048) >> 12;
    t53a = (t42  *  2896 + t53  * 2896 + 2048) >> 12;
    t54  = (t41a *  2896 + t54a * 2896 + 2048) >> 12;
    t55a = (t40  *  2896 + t55  * 2896 + 2048) >> 12;

566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
    out[ 0 * out_s] = CLIP(tmp[ 0] + t63a);
    out[ 1 * out_s] = CLIP(tmp[ 1] + t62);
    out[ 2 * out_s] = CLIP(tmp[ 2] + t61a);
    out[ 3 * out_s] = CLIP(tmp[ 3] + t60);
    out[ 4 * out_s] = CLIP(tmp[ 4] + t59a);
    out[ 5 * out_s] = CLIP(tmp[ 5] + t58);
    out[ 6 * out_s] = CLIP(tmp[ 6] + t57a);
    out[ 7 * out_s] = CLIP(tmp[ 7] + t56);
    out[ 8 * out_s] = CLIP(tmp[ 8] + t55a);
    out[ 9 * out_s] = CLIP(tmp[ 9] + t54);
    out[10 * out_s] = CLIP(tmp[10] + t53a);
    out[11 * out_s] = CLIP(tmp[11] + t52);
    out[12 * out_s] = CLIP(tmp[12] + t51a);
    out[13 * out_s] = CLIP(tmp[13] + t50);
    out[14 * out_s] = CLIP(tmp[14] + t49a);
    out[15 * out_s] = CLIP(tmp[15] + t48);
    out[16 * out_s] = CLIP(tmp[16] + t47);
    out[17 * out_s] = CLIP(tmp[17] + t46a);
    out[18 * out_s] = CLIP(tmp[18] + t45);
    out[19 * out_s] = CLIP(tmp[19] + t44a);
    out[20 * out_s] = CLIP(tmp[20] + t43);
    out[21 * out_s] = CLIP(tmp[21] + t42a);
    out[22 * out_s] = CLIP(tmp[22] + t41);
    out[23 * out_s] = CLIP(tmp[23] + t40a);
    out[24 * out_s] = CLIP(tmp[24] + t39);
    out[25 * out_s] = CLIP(tmp[25] + t38a);
    out[26 * out_s] = CLIP(tmp[26] + t37);
    out[27 * out_s] = CLIP(tmp[27] + t36a);
    out[28 * out_s] = CLIP(tmp[28] + t35);
    out[29 * out_s] = CLIP(tmp[29] + t34a);
    out[30 * out_s] = CLIP(tmp[30] + t33);
    out[31 * out_s] = CLIP(tmp[31] + t32a);
    out[32 * out_s] = CLIP(tmp[31] - t32a);
    out[33 * out_s] = CLIP(tmp[30] - t33);
    out[34 * out_s] = CLIP(tmp[29] - t34a);
    out[35 * out_s] = CLIP(tmp[28] - t35);
    out[36 * out_s] = CLIP(tmp[27] - t36a);
    out[37 * out_s] = CLIP(tmp[26] - t37);
    out[38 * out_s] = CLIP(tmp[25] - t38a);
    out[39 * out_s] = CLIP(tmp[24] - t39);
    out[40 * out_s] = CLIP(tmp[23] - t40a);
    out[41 * out_s] = CLIP(tmp[22] - t41);
    out[42 * out_s] = CLIP(tmp[21] - t42a);
    out[43 * out_s] = CLIP(tmp[20] - t43);
    out[44 * out_s] = CLIP(tmp[19] - t44a);
    out[45 * out_s] = CLIP(tmp[18] - t45);
    out[46 * out_s] = CLIP(tmp[17] - t46a);
    out[47 * out_s] = CLIP(tmp[16] - t47);
    out[48 * out_s] = CLIP(tmp[15] - t48);
    out[49 * out_s] = CLIP(tmp[14] - t49a);
    out[50 * out_s] = CLIP(tmp[13] - t50);
    out[51 * out_s] = CLIP(tmp[12] - t51a);
    out[52 * out_s] = CLIP(tmp[11] - t52);
    out[53 * out_s] = CLIP(tmp[10] - t53a);
    out[54 * out_s] = CLIP(tmp[ 9] - t54);
    out[55 * out_s] = CLIP(tmp[ 8] - t55a);
    out[56 * out_s] = CLIP(tmp[ 7] - t56);
    out[57 * out_s] = CLIP(tmp[ 6] - t57a);
    out[58 * out_s] = CLIP(tmp[ 5] - t58);
    out[59 * out_s] = CLIP(tmp[ 4] - t59a);
    out[60 * out_s] = CLIP(tmp[ 3] - t60);
    out[61 * out_s] = CLIP(tmp[ 2] - t61a);
    out[62 * out_s] = CLIP(tmp[ 1] - t62);
    out[63 * out_s] = CLIP(tmp[ 0] - t63a);
630 631
}

632
static void NOINLINE
633
inv_adst4_1d(const coef *const in, const ptrdiff_t in_s,
634
             coef *const out, const ptrdiff_t out_s, const int range)
635 636 637 638 639 640 641 642 643 644 645 646 647 648 649
{
    const int in0 = in[0 * in_s], in1 = in[1 * in_s];
    const int in2 = in[2 * in_s], in3 = in[3 * in_s];

    int t0 = 1321 * in0 + 3803 * in2 + 2482 * in3;
    int t1 = 2482 * in0 - 1321 * in2 - 3803 * in3;
    int t2 = 3344 * (in0 - in2 + in3);
    int t3 = 3344 * in1;

    out[0 * out_s] = (t0 + t3      + 2048) >> 12;
    out[1 * out_s] = (t1 + t3      + 2048) >> 12;
    out[2 * out_s] = (t2           + 2048) >> 12;
    out[3 * out_s] = (t0 + t1 - t3 + 2048) >> 12;
}

650
static void NOINLINE
651
inv_adst8_1d(const coef *const in, const ptrdiff_t in_s,
652
             coef *const out, const ptrdiff_t out_s, const int max)
653
{
654
    const int min = -max - 1;
655 656 657 658 659 660 661 662 663 664 665 666 667 668
    const int in0 = in[0 * in_s], in1 = in[1 * in_s];
    const int in2 = in[2 * in_s], in3 = in[3 * in_s];
    const int in4 = in[4 * in_s], in5 = in[5 * in_s];
    const int in6 = in[6 * in_s], in7 = in[7 * in_s];

    int t0a = (4076 * in7 +  401 * in0 + 2048) >> 12;
    int t1a = ( 401 * in7 - 4076 * in0 + 2048) >> 12;
    int t2a = (3612 * in5 + 1931 * in2 + 2048) >> 12;
    int t3a = (1931 * in5 - 3612 * in2 + 2048) >> 12;
    int t4a = (2598 * in3 + 3166 * in4 + 2048) >> 12;
    int t5a = (3166 * in3 - 2598 * in4 + 2048) >> 12;
    int t6a = (1189 * in1 + 3920 * in6 + 2048) >> 12;
    int t7a = (3920 * in1 - 1189 * in6 + 2048) >> 12;

669 670 671 672 673 674 675 676
    int t0 = CLIP(t0a + t4a);
    int t1 = CLIP(t1a + t5a);
    int t2 = CLIP(t2a + t6a);
    int t3 = CLIP(t3a + t7a);
    int t4 = CLIP(t0a - t4a);
    int t5 = CLIP(t1a - t5a);
    int t6 = CLIP(t2a - t6a);
    int t7 = CLIP(t3a - t7a);
677 678 679 680 681 682

    t4a = (3784 * t4 + 1567 * t5 + 2048) >> 12;
    t5a = (1567 * t4 - 3784 * t5 + 2048) >> 12;
    t6a = (3784 * t7 - 1567 * t6 + 2048) >> 12;
    t7a = (1567 * t7 + 3784 * t6 + 2048) >> 12;

683 684 685 686
    out[0 * out_s] = CLIP(  t0 + t2);
    out[7 * out_s] = CLIP(-(t1 + t3));
    t2             = CLIP(  t0 - t2);
    t3             = CLIP(  t1 - t3);
687

688 689 690 691
    out[1 * out_s] = CLIP(-(t4a + t6a));
    out[6 * out_s] = CLIP(  t5a + t7a );
    t6             = CLIP(  t4a - t6a );
    t7             = CLIP(  t5a - t7a );
692 693 694 695 696 697 698

    out[3 * out_s] = -(((t2 + t3) * 2896 + 2048) >> 12);
    out[4 * out_s] =   ((t2 - t3) * 2896 + 2048) >> 12;
    out[2 * out_s] =   ((t6 + t7) * 2896 + 2048) >> 12;
    out[5 * out_s] = -(((t6 - t7) * 2896 + 2048) >> 12);
}

699
static void NOINLINE
700
inv_adst16_1d(const coef *const in, const ptrdiff_t in_s,
701
              coef *const out, const ptrdiff_t out_s, const int max)
702
{
703
    const int min = -max - 1;
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729
    const int in0  = in[ 0 * in_s], in1  = in[ 1 * in_s];
    const int in2  = in[ 2 * in_s], in3  = in[ 3 * in_s];
    const int in4  = in[ 4 * in_s], in5  = in[ 5 * in_s];
    const int in6  = in[ 6 * in_s], in7  = in[ 7 * in_s];
    const int in8  = in[ 8 * in_s], in9  = in[ 9 * in_s];
    const int in10 = in[10 * in_s], in11 = in[11 * in_s];
    const int in12 = in[12 * in_s], in13 = in[13 * in_s];
    const int in14 = in[14 * in_s], in15 = in[15 * in_s];

    int t0  = (in15 * 4091 + in0  *  201 + 2048) >> 12;
    int t1  = (in15 *  201 - in0  * 4091 + 2048) >> 12;
    int t2  = (in13 * 3973 + in2  *  995 + 2048) >> 12;
    int t3  = (in13 *  995 - in2  * 3973 + 2048) >> 12;
    int t4  = (in11 * 3703 + in4  * 1751 + 2048) >> 12;
    int t5  = (in11 * 1751 - in4  * 3703 + 2048) >> 12;
    int t6  = (in9  * 3290 + in6  * 2440 + 2048) >> 12;
    int t7  = (in9  * 2440 - in6  * 3290 + 2048) >> 12;
    int t8  = (in7  * 2751 + in8  * 3035 + 2048) >> 12;
    int t9  = (in7  * 3035 - in8  * 2751 + 2048) >> 12;
    int t10 = (in5  * 2106 + in10 * 3513 + 2048) >> 12;
    int t11 = (in5  * 3513 - in10 * 2106 + 2048) >> 12;
    int t12 = (in3  * 1380 + in12 * 3857 + 2048) >> 12;
    int t13 = (in3  * 3857 - in12 * 1380 + 2048) >> 12;
    int t14 = (in1  *  601 + in14 * 4052 + 2048) >> 12;
    int t15 = (in1  * 4052 - in14 *  601 + 2048) >> 12;

730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
    int t0a  = CLIP(t0 + t8 );
    int t1a  = CLIP(t1 + t9 );
    int t2a  = CLIP(t2 + t10);
    int t3a  = CLIP(t3 + t11);
    int t4a  = CLIP(t4 + t12);
    int t5a  = CLIP(t5 + t13);
    int t6a  = CLIP(t6 + t14);
    int t7a  = CLIP(t7 + t15);
    int t8a  = CLIP(t0 - t8 );
    int t9a  = CLIP(t1 - t9 );
    int t10a = CLIP(t2 - t10);
    int t11a = CLIP(t3 - t11);
    int t12a = CLIP(t4 - t12);
    int t13a = CLIP(t5 - t13);
    int t14a = CLIP(t6 - t14);
    int t15a = CLIP(t7 - t15);
746 747 748 749 750 751 752 753 754 755

    t8   = (t8a  * 4017 + t9a  *  799 + 2048) >> 12;
    t9   = (t8a  *  799 - t9a  * 4017 + 2048) >> 12;
    t10  = (t10a * 2276 + t11a * 3406 + 2048) >> 12;
    t11  = (t10a * 3406 - t11a * 2276 + 2048) >> 12;
    t12  = (t13a * 4017 - t12a *  799 + 2048) >> 12;
    t13  = (t13a *  799 + t12a * 4017 + 2048) >> 12;
    t14  = (t15a * 2276 - t14a * 3406 + 2048) >> 12;
    t15  = (t15a * 3406 + t14a * 2276 + 2048) >> 12;

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    t0   = CLIP(t0a + t4a);
    t1   = CLIP(t1a + t5a);
    t2   = CLIP(t2a + t6a);
    t3   = CLIP(t3a + t7a);
    t4   = CLIP(t0a - t4a);
    t5   = CLIP(t1a - t5a);
    t6   = CLIP(t2a - t6a);
    t7   = CLIP(t3a - t7a);
    t8a  = CLIP(t8  + t12);
    t9a  = CLIP(t9  + t13);
    t10a = CLIP(t10 + t14);
    t11a = CLIP(t11 + t15);
    t12a = CLIP(t8  - t12);
    t13a = CLIP(t9  - t13);
    t14a = CLIP(t10 - t14);
    t15a = CLIP(t11 - t15);
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    t4a  = (t4   * 3784 + t5   * 1567 + 2048) >> 12;
    t5a  = (t4   * 1567 - t5   * 3784 + 2048) >> 12;
    t6a  = (t7   * 3784 - t6   * 1567 + 2048) >> 12;
    t7a  = (t7   * 1567 + t6   * 3784 + 2048) >> 12;
    t12  = (t12a * 3784 + t13a * 1567 + 2048) >> 12;
    t13  = (t12a * 1567 - t13a * 3784 + 2048) >> 12;
    t14  = (t15a * 3784 - t14a * 1567 + 2048) >> 12;
    t15  = (t15a * 1567 + t14a * 3784 + 2048) >> 12;

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    out[ 0 * out_s] = CLIP(  t0  + t2   );
    out[15 * out_s] = CLIP(-(t1  + t3)  );
    t2a             = CLIP(  t0  - t2   );
    t3a             = CLIP(  t1  - t3   );
    out[ 3 * out_s] = CLIP(-(t4a + t6a) );
    out[12 * out_s] = CLIP(  t5a + t7a  );
    t6              = CLIP(  t4a - t6a  );
    t7              = CLIP(  t5a - t7a  );
    out[ 1 * out_s] = CLIP(-(t8a + t10a));
    out[14 * out_s] = CLIP(  t9a + t11a );
    t10             = CLIP(  t8a - t10a );
    t11             = CLIP(  t9a - t11a );
    out[ 2 * out_s] = CLIP(  t12 + t14  );
    out[13 * out_s] = CLIP(-(t13 + t15) );
    t14a            = CLIP(  t12 - t14  );
    t15a            = CLIP(  t13 - t15  );
798 799 800 801 802 803 804 805 806 807 808 809 810

    out[ 7 * out_s] = -(((t2a  + t3a)  * 2896 + 2048) >> 12);
    out[ 8 * out_s] =   ((t2a  - t3a)  * 2896 + 2048) >> 12;
    out[ 4 * out_s] =   ((t6   + t7)   * 2896 + 2048) >> 12;
    out[11 * out_s] = -(((t6   - t7)   * 2896 + 2048) >> 12);
    out[ 6 * out_s] =   ((t10  + t11)  * 2896 + 2048) >> 12;
    out[ 9 * out_s] = -(((t10  - t11)  * 2896 + 2048) >> 12);
    out[ 5 * out_s] = -(((t14a + t15a) * 2896 + 2048) >> 12);
    out[10 * out_s] =   ((t14a - t15a) * 2896 + 2048) >> 12;
}

#define flip_inv_adst(sz) \
static void inv_flipadst##sz##_1d(const coef *const in, const ptrdiff_t in_s, \
811
                                  coef *const out, const ptrdiff_t out_s, const int range) \
812
{ \
813
    inv_adst##sz##_1d(in, in_s, &out[(sz - 1) * out_s], -out_s, range); \
814 815
}

816 817 818
flip_inv_adst(4)
flip_inv_adst(8)
flip_inv_adst(16)
819 820 821

#undef flip_inv_adst

822
static void NOINLINE
823
inv_identity4_1d(const coef *const in, const ptrdiff_t in_s,
824
                 coef *const out, const ptrdiff_t out_s, const int range)
825 826 827 828 829
{
    for (int i = 0; i < 4; i++)
        out[out_s * i] = (in[in_s * i] * 5793 + 2048) >> 12;
}

830
static void NOINLINE
831
inv_identity8_1d(const coef *const in, const ptrdiff_t in_s,
832
                 coef *const out, const ptrdiff_t out_s, const int range)
833 834 835 836 837
{
    for (int i = 0; i < 8; i++)
        out[out_s * i] = in[in_s * i] * 2;
}

838
static void NOINLINE
839
inv_identity16_1d(const coef *const in, const ptrdiff_t in_s,
840
                  coef *const out, const ptrdiff_t out_s, const int range)
841 842 843 844 845
{
    for (int i = 0; i < 16; i++)
        out[out_s * i] = (in[in_s * i] * 2 * 5793 + 2048) >> 12;
}

846
static void NOINLINE
847
inv_identity32_1d(const coef *const in, const ptrdiff_t in_s,
848
                  coef *const out, const ptrdiff_t out_s, const int range)
849 850 851 852 853
{
    for (int i = 0; i < 32; i++)
        out[out_s * i] = in[in_s * i] * 4;
}

854
static void NOINLINE
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872
inv_wht4_1d(const coef *const in, const ptrdiff_t in_s,
            coef *const out, const ptrdiff_t out_s,
            const int pass)
{
    const int sh = 2 * !pass;
    const int in0 = in[0 * in_s] >> sh, in1 = in[1 * in_s] >> sh;
    const int in2 = in[2 * in_s] >> sh, in3 = in[3 * in_s] >> sh;
    const int t0 = in0 + in1;
    const int t2 = in2 - in3;
    const int t4 = (t0 - t2) >> 1;
    const int t3 = t4 - in3;
    const int t1 = t4 - in1;

    out[0 * out_s] = t0 - t3;
    out[1 * out_s] = t3;
    out[2 * out_s] = t1;
    out[3 * out_s] = t2 + t1;
}