1 /*
2 * Copyright (c) 2014 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <arm_neon.h>
12
13 static const int16_t cospi8sqrt2minus1 = 20091;
14 static const int16_t sinpi8sqrt2 = 35468;
15
vp8_dequant_idct_add_neon(int16_t * input,int16_t * dq,unsigned char * dst,int stride)16 void vp8_dequant_idct_add_neon(
17 int16_t *input,
18 int16_t *dq,
19 unsigned char *dst,
20 int stride) {
21 unsigned char *dst0;
22 int32x2_t d14, d15;
23 int16x4_t d2, d3, d4, d5, d10, d11, d12, d13;
24 int16x8_t q1, q2, q3, q4, q5, q6;
25 int16x8_t qEmpty = vdupq_n_s16(0);
26 int32x2x2_t d2tmp0, d2tmp1;
27 int16x4x2_t d2tmp2, d2tmp3;
28
29 d14 = d15 = vdup_n_s32(0);
30
31 // load input
32 q3 = vld1q_s16(input);
33 vst1q_s16(input, qEmpty);
34 input += 8;
35 q4 = vld1q_s16(input);
36 vst1q_s16(input, qEmpty);
37
38 // load dq
39 q5 = vld1q_s16(dq);
40 dq += 8;
41 q6 = vld1q_s16(dq);
42
43 // load src from dst
44 dst0 = dst;
45 d14 = vld1_lane_s32((const int32_t *)dst0, d14, 0);
46 dst0 += stride;
47 d14 = vld1_lane_s32((const int32_t *)dst0, d14, 1);
48 dst0 += stride;
49 d15 = vld1_lane_s32((const int32_t *)dst0, d15, 0);
50 dst0 += stride;
51 d15 = vld1_lane_s32((const int32_t *)dst0, d15, 1);
52
53 q1 = vreinterpretq_s16_u16(vmulq_u16(vreinterpretq_u16_s16(q3),
54 vreinterpretq_u16_s16(q5)));
55 q2 = vreinterpretq_s16_u16(vmulq_u16(vreinterpretq_u16_s16(q4),
56 vreinterpretq_u16_s16(q6)));
57
58 d12 = vqadd_s16(vget_low_s16(q1), vget_low_s16(q2));
59 d13 = vqsub_s16(vget_low_s16(q1), vget_low_s16(q2));
60
61 q2 = vcombine_s16(vget_high_s16(q1), vget_high_s16(q2));
62
63 q3 = vqdmulhq_n_s16(q2, sinpi8sqrt2);
64 q4 = vqdmulhq_n_s16(q2, cospi8sqrt2minus1);
65
66 q3 = vshrq_n_s16(q3, 1);
67 q4 = vshrq_n_s16(q4, 1);
68
69 q3 = vqaddq_s16(q3, q2);
70 q4 = vqaddq_s16(q4, q2);
71
72 d10 = vqsub_s16(vget_low_s16(q3), vget_high_s16(q4));
73 d11 = vqadd_s16(vget_high_s16(q3), vget_low_s16(q4));
74
75 d2 = vqadd_s16(d12, d11);
76 d3 = vqadd_s16(d13, d10);
77 d4 = vqsub_s16(d13, d10);
78 d5 = vqsub_s16(d12, d11);
79
80 d2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4));
81 d2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5));
82 d2tmp2 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[0]),
83 vreinterpret_s16_s32(d2tmp1.val[0]));
84 d2tmp3 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[1]),
85 vreinterpret_s16_s32(d2tmp1.val[1]));
86
87 // loop 2
88 q2 = vcombine_s16(d2tmp2.val[1], d2tmp3.val[1]);
89
90 q3 = vqdmulhq_n_s16(q2, sinpi8sqrt2);
91 q4 = vqdmulhq_n_s16(q2, cospi8sqrt2minus1);
92
93 d12 = vqadd_s16(d2tmp2.val[0], d2tmp3.val[0]);
94 d13 = vqsub_s16(d2tmp2.val[0], d2tmp3.val[0]);
95
96 q3 = vshrq_n_s16(q3, 1);
97 q4 = vshrq_n_s16(q4, 1);
98
99 q3 = vqaddq_s16(q3, q2);
100 q4 = vqaddq_s16(q4, q2);
101
102 d10 = vqsub_s16(vget_low_s16(q3), vget_high_s16(q4));
103 d11 = vqadd_s16(vget_high_s16(q3), vget_low_s16(q4));
104
105 d2 = vqadd_s16(d12, d11);
106 d3 = vqadd_s16(d13, d10);
107 d4 = vqsub_s16(d13, d10);
108 d5 = vqsub_s16(d12, d11);
109
110 d2 = vrshr_n_s16(d2, 3);
111 d3 = vrshr_n_s16(d3, 3);
112 d4 = vrshr_n_s16(d4, 3);
113 d5 = vrshr_n_s16(d5, 3);
114
115 d2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4));
116 d2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5));
117 d2tmp2 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[0]),
118 vreinterpret_s16_s32(d2tmp1.val[0]));
119 d2tmp3 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[1]),
120 vreinterpret_s16_s32(d2tmp1.val[1]));
121
122 q1 = vcombine_s16(d2tmp2.val[0], d2tmp2.val[1]);
123 q2 = vcombine_s16(d2tmp3.val[0], d2tmp3.val[1]);
124
125 q1 = vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(q1),
126 vreinterpret_u8_s32(d14)));
127 q2 = vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(q2),
128 vreinterpret_u8_s32(d15)));
129
130 d14 = vreinterpret_s32_u8(vqmovun_s16(q1));
131 d15 = vreinterpret_s32_u8(vqmovun_s16(q2));
132
133 dst0 = dst;
134 vst1_lane_s32((int32_t *)dst0, d14, 0);
135 dst0 += stride;
136 vst1_lane_s32((int32_t *)dst0, d14, 1);
137 dst0 += stride;
138 vst1_lane_s32((int32_t *)dst0, d15, 0);
139 dst0 += stride;
140 vst1_lane_s32((int32_t *)dst0, d15, 1);
141 return;
142 }
143