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_short_idct4x4llm_neon(int16_t * input,unsigned char * pred_ptr,int pred_stride,unsigned char * dst_ptr,int dst_stride)16 void vp8_short_idct4x4llm_neon(
17 int16_t *input,
18 unsigned char *pred_ptr,
19 int pred_stride,
20 unsigned char *dst_ptr,
21 int dst_stride) {
22 int i;
23 uint32x2_t d6u32 = vdup_n_u32(0);
24 uint8x8_t d1u8;
25 int16x4_t d2, d3, d4, d5, d10, d11, d12, d13;
26 uint16x8_t q1u16;
27 int16x8_t q1s16, q2s16, q3s16, q4s16;
28 int32x2x2_t v2tmp0, v2tmp1;
29 int16x4x2_t v2tmp2, v2tmp3;
30
31 d2 = vld1_s16(input);
32 d3 = vld1_s16(input + 4);
33 d4 = vld1_s16(input + 8);
34 d5 = vld1_s16(input + 12);
35
36 // 1st for loop
37 q1s16 = vcombine_s16(d2, d4); // Swap d3 d4 here
38 q2s16 = vcombine_s16(d3, d5);
39
40 q3s16 = vqdmulhq_n_s16(q2s16, sinpi8sqrt2);
41 q4s16 = vqdmulhq_n_s16(q2s16, cospi8sqrt2minus1);
42
43 d12 = vqadd_s16(vget_low_s16(q1s16), vget_high_s16(q1s16)); // a1
44 d13 = vqsub_s16(vget_low_s16(q1s16), vget_high_s16(q1s16)); // b1
45
46 q3s16 = vshrq_n_s16(q3s16, 1);
47 q4s16 = vshrq_n_s16(q4s16, 1);
48
49 q3s16 = vqaddq_s16(q3s16, q2s16);
50 q4s16 = vqaddq_s16(q4s16, q2s16);
51
52 d10 = vqsub_s16(vget_low_s16(q3s16), vget_high_s16(q4s16)); // c1
53 d11 = vqadd_s16(vget_high_s16(q3s16), vget_low_s16(q4s16)); // d1
54
55 d2 = vqadd_s16(d12, d11);
56 d3 = vqadd_s16(d13, d10);
57 d4 = vqsub_s16(d13, d10);
58 d5 = vqsub_s16(d12, d11);
59
60 v2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4));
61 v2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5));
62 v2tmp2 = vtrn_s16(vreinterpret_s16_s32(v2tmp0.val[0]),
63 vreinterpret_s16_s32(v2tmp1.val[0]));
64 v2tmp3 = vtrn_s16(vreinterpret_s16_s32(v2tmp0.val[1]),
65 vreinterpret_s16_s32(v2tmp1.val[1]));
66
67 // 2nd for loop
68 q1s16 = vcombine_s16(v2tmp2.val[0], v2tmp3.val[0]);
69 q2s16 = vcombine_s16(v2tmp2.val[1], v2tmp3.val[1]);
70
71 q3s16 = vqdmulhq_n_s16(q2s16, sinpi8sqrt2);
72 q4s16 = vqdmulhq_n_s16(q2s16, cospi8sqrt2minus1);
73
74 d12 = vqadd_s16(vget_low_s16(q1s16), vget_high_s16(q1s16)); // a1
75 d13 = vqsub_s16(vget_low_s16(q1s16), vget_high_s16(q1s16)); // b1
76
77 q3s16 = vshrq_n_s16(q3s16, 1);
78 q4s16 = vshrq_n_s16(q4s16, 1);
79
80 q3s16 = vqaddq_s16(q3s16, q2s16);
81 q4s16 = vqaddq_s16(q4s16, q2s16);
82
83 d10 = vqsub_s16(vget_low_s16(q3s16), vget_high_s16(q4s16)); // c1
84 d11 = vqadd_s16(vget_high_s16(q3s16), vget_low_s16(q4s16)); // d1
85
86 d2 = vqadd_s16(d12, d11);
87 d3 = vqadd_s16(d13, d10);
88 d4 = vqsub_s16(d13, d10);
89 d5 = vqsub_s16(d12, d11);
90
91 d2 = vrshr_n_s16(d2, 3);
92 d3 = vrshr_n_s16(d3, 3);
93 d4 = vrshr_n_s16(d4, 3);
94 d5 = vrshr_n_s16(d5, 3);
95
96 v2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4));
97 v2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5));
98 v2tmp2 = vtrn_s16(vreinterpret_s16_s32(v2tmp0.val[0]),
99 vreinterpret_s16_s32(v2tmp1.val[0]));
100 v2tmp3 = vtrn_s16(vreinterpret_s16_s32(v2tmp0.val[1]),
101 vreinterpret_s16_s32(v2tmp1.val[1]));
102
103 q1s16 = vcombine_s16(v2tmp2.val[0], v2tmp2.val[1]);
104 q2s16 = vcombine_s16(v2tmp3.val[0], v2tmp3.val[1]);
105
106 // dc_only_idct_add
107 for (i = 0; i < 2; i++, q1s16 = q2s16) {
108 d6u32 = vld1_lane_u32((const uint32_t *)pred_ptr, d6u32, 0);
109 pred_ptr += pred_stride;
110 d6u32 = vld1_lane_u32((const uint32_t *)pred_ptr, d6u32, 1);
111 pred_ptr += pred_stride;
112
113 q1u16 = vaddw_u8(vreinterpretq_u16_s16(q1s16),
114 vreinterpret_u8_u32(d6u32));
115 d1u8 = vqmovun_s16(vreinterpretq_s16_u16(q1u16));
116
117 vst1_lane_u32((uint32_t *)dst_ptr, vreinterpret_u32_u8(d1u8), 0);
118 dst_ptr += dst_stride;
119 vst1_lane_u32((uint32_t *)dst_ptr, vreinterpret_u32_u8(d1u8), 1);
120 dst_ptr += dst_stride;
121 }
122 return;
123 }
124