quantize_sse4.c 4.84 KB
Newer Older
Johann's avatar
Johann committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
/*
 *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */


#include <smmintrin.h> /* SSE4.1 */

#include "./vp8_rtcd.h"
#include "vp8/encoder/block.h"
#include "vp8/common/entropy.h" /* vp8_default_inv_zig_zag */

#define SELECT_EOB(i, z, x, y, q) \
    do { \
        short boost = *zbin_boost_ptr; \
        short x_z = _mm_extract_epi16(x, z); \
        short y_z = _mm_extract_epi16(y, z); \
        int cmp = (x_z < boost) | (y_z == 0); \
        zbin_boost_ptr++; \
        if (cmp) \
Johann's avatar
Johann committed
26
            break; \
Johann's avatar
Johann committed
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
        q = _mm_insert_epi16(q, y_z, z); \
        eob = i; \
        zbin_boost_ptr = b->zrun_zbin_boost; \
    } while (0)

void vp8_regular_quantize_b_sse4_1(BLOCK *b, BLOCKD *d) {
    char eob = 0;
    short *zbin_boost_ptr  = b->zrun_zbin_boost;

    __m128i sz0, x0, sz1, x1, y0, y1, x_minus_zbin0, x_minus_zbin1,
            dqcoeff0, dqcoeff1;
    __m128i quant_shift0 = _mm_load_si128((__m128i *)(b->quant_shift));
    __m128i quant_shift1 = _mm_load_si128((__m128i *)(b->quant_shift + 8));
    __m128i z0 = _mm_load_si128((__m128i *)(b->coeff));
    __m128i z1 = _mm_load_si128((__m128i *)(b->coeff+8));
    __m128i zbin_extra = _mm_cvtsi32_si128(b->zbin_extra);
    __m128i zbin0 = _mm_load_si128((__m128i *)(b->zbin));
    __m128i zbin1 = _mm_load_si128((__m128i *)(b->zbin + 8));
    __m128i round0 = _mm_load_si128((__m128i *)(b->round));
    __m128i round1 = _mm_load_si128((__m128i *)(b->round + 8));
    __m128i quant0 = _mm_load_si128((__m128i *)(b->quant));
    __m128i quant1 = _mm_load_si128((__m128i *)(b->quant + 8));
    __m128i dequant0 = _mm_load_si128((__m128i *)(d->dequant));
    __m128i dequant1 = _mm_load_si128((__m128i *)(d->dequant + 8));
    __m128i qcoeff0 = _mm_setzero_si128();
    __m128i qcoeff1 = _mm_setzero_si128();

    /* Duplicate to all lanes. */
    zbin_extra = _mm_shufflelo_epi16(zbin_extra, 0);
    zbin_extra = _mm_unpacklo_epi16(zbin_extra, zbin_extra);

    /* Sign of z: z >> 15 */
    sz0 = _mm_srai_epi16(z0, 15);
    sz1 = _mm_srai_epi16(z1, 15);

    /* x = abs(z): (z ^ sz) - sz */
    x0 = _mm_xor_si128(z0, sz0);
    x1 = _mm_xor_si128(z1, sz1);
    x0 = _mm_sub_epi16(x0, sz0);
    x1 = _mm_sub_epi16(x1, sz1);

    /* zbin[] + zbin_extra */
    zbin0 = _mm_add_epi16(zbin0, zbin_extra);
    zbin1 = _mm_add_epi16(zbin1, zbin_extra);

    /* In C x is compared to zbin where zbin = zbin[] + boost + extra. Rebalance
     * the equation because boost is the only value which can change:
     * x - (zbin[] + extra) >= boost */
    x_minus_zbin0 = _mm_sub_epi16(x0, zbin0);
    x_minus_zbin1 = _mm_sub_epi16(x1, zbin1);

    /* All the remaining calculations are valid whether they are done now with
     * simd or later inside the loop one at a time. */
    x0 = _mm_add_epi16(x0, round0);
    x1 = _mm_add_epi16(x1, round1);

    y0 = _mm_mulhi_epi16(x0, quant0);
    y1 = _mm_mulhi_epi16(x1, quant1);

    y0 = _mm_add_epi16(y0, x0);
    y1 = _mm_add_epi16(y1, x1);

    /* Instead of shifting each value independently we convert the scaling
     * factor with 1 << (16 - shift) so we can use multiply/return high half. */
    y0 = _mm_mulhi_epi16(y0, quant_shift0);
    y1 = _mm_mulhi_epi16(y1, quant_shift1);

    /* Return the sign: (y ^ sz) - sz */
    y0 = _mm_xor_si128(y0, sz0);
    y1 = _mm_xor_si128(y1, sz1);
    y0 = _mm_sub_epi16(y0, sz0);
    y1 = _mm_sub_epi16(y1, sz1);

    /* The loop gets unrolled anyway. Avoid the vp8_default_zig_zag1d lookup. */
    SELECT_EOB(1, 0, x_minus_zbin0, y0, qcoeff0);
    SELECT_EOB(2, 1, x_minus_zbin0, y0, qcoeff0);
    SELECT_EOB(3, 4, x_minus_zbin0, y0, qcoeff0);
    SELECT_EOB(4, 0, x_minus_zbin1, y1, qcoeff1);
    SELECT_EOB(5, 5, x_minus_zbin0, y0, qcoeff0);
    SELECT_EOB(6, 2, x_minus_zbin0, y0, qcoeff0);
    SELECT_EOB(7, 3, x_minus_zbin0, y0, qcoeff0);
    SELECT_EOB(8, 6, x_minus_zbin0, y0, qcoeff0);
    SELECT_EOB(9, 1, x_minus_zbin1, y1, qcoeff1);
    SELECT_EOB(10, 4, x_minus_zbin1, y1, qcoeff1);
    SELECT_EOB(11, 5, x_minus_zbin1, y1, qcoeff1);
    SELECT_EOB(12, 2, x_minus_zbin1, y1, qcoeff1);
    SELECT_EOB(13, 7, x_minus_zbin0, y0, qcoeff0);
    SELECT_EOB(14, 3, x_minus_zbin1, y1, qcoeff1);
    SELECT_EOB(15, 6, x_minus_zbin1, y1, qcoeff1);
    SELECT_EOB(16, 7, x_minus_zbin1, y1, qcoeff1);

    _mm_store_si128((__m128i *)(d->qcoeff), qcoeff0);
    _mm_store_si128((__m128i *)(d->qcoeff + 8), qcoeff1);

    dqcoeff0 = _mm_mullo_epi16(qcoeff0, dequant0);
    dqcoeff1 = _mm_mullo_epi16(qcoeff1, dequant1);

    _mm_store_si128((__m128i *)(d->dqcoeff), dqcoeff0);
    _mm_store_si128((__m128i *)(d->dqcoeff + 8), dqcoeff1);

    *d->eob = eob;
}