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
idct_dequant_0_2x_neon(int16_t * q,int16_t dq,unsigned char * dst,int stride)13 void idct_dequant_0_2x_neon(
14 int16_t *q,
15 int16_t dq,
16 unsigned char *dst,
17 int stride) {
18 unsigned char *dst0;
19 int i, a0, a1;
20 int16x8x2_t q2Add;
21 int32x2_t d2s32 = vdup_n_s32(0),
22 d4s32 = vdup_n_s32(0);
23 uint8x8_t d2u8, d4u8;
24 uint16x8_t q1u16, q2u16;
25
26 a0 = ((q[0] * dq) + 4) >> 3;
27 a1 = ((q[16] * dq) + 4) >> 3;
28 q[0] = q[16] = 0;
29 q2Add.val[0] = vdupq_n_s16((int16_t)a0);
30 q2Add.val[1] = vdupq_n_s16((int16_t)a1);
31
32 for (i = 0; i < 2; i++, dst += 4) {
33 dst0 = dst;
34 d2s32 = vld1_lane_s32((const int32_t *)dst0, d2s32, 0);
35 dst0 += stride;
36 d2s32 = vld1_lane_s32((const int32_t *)dst0, d2s32, 1);
37 dst0 += stride;
38 d4s32 = vld1_lane_s32((const int32_t *)dst0, d4s32, 0);
39 dst0 += stride;
40 d4s32 = vld1_lane_s32((const int32_t *)dst0, d4s32, 1);
41
42 q1u16 = vaddw_u8(vreinterpretq_u16_s16(q2Add.val[i]),
43 vreinterpret_u8_s32(d2s32));
44 q2u16 = vaddw_u8(vreinterpretq_u16_s16(q2Add.val[i]),
45 vreinterpret_u8_s32(d4s32));
46
47 d2u8 = vqmovun_s16(vreinterpretq_s16_u16(q1u16));
48 d4u8 = vqmovun_s16(vreinterpretq_s16_u16(q2u16));
49
50 d2s32 = vreinterpret_s32_u8(d2u8);
51 d4s32 = vreinterpret_s32_u8(d4u8);
52
53 dst0 = dst;
54 vst1_lane_s32((int32_t *)dst0, d2s32, 0);
55 dst0 += stride;
56 vst1_lane_s32((int32_t *)dst0, d2s32, 1);
57 dst0 += stride;
58 vst1_lane_s32((int32_t *)dst0, d4s32, 0);
59 dst0 += stride;
60 vst1_lane_s32((int32_t *)dst0, d4s32, 1);
61 }
62 return;
63 }
64