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
26
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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
;
; Copyright (c) 2016, Alliance for Open Media. All rights reserved
;
; This source code is subject to the terms of the BSD 2 Clause License and
; the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
; was not distributed with this source code in the LICENSE file, you can
; obtain it at www.aomedia.org/license/software. If the Alliance for Open
; Media Patent License 1.0 was not distributed with this source code in the
; PATENTS file, you can obtain it at www.aomedia.org/license/patent.
;
EXPORT |aom_idct32x32_1_add_neon|
ARM
REQUIRE8
PRESERVE8
AREA ||.text||, CODE, READONLY, ALIGN=2
;TODO(hkuang): put the following macros in a seperate
;file so other idct function could also use them.
MACRO
LD_16x8 $src, $stride
vld1.8 {q8}, [$src], $stride
vld1.8 {q9}, [$src], $stride
vld1.8 {q10}, [$src], $stride
vld1.8 {q11}, [$src], $stride
vld1.8 {q12}, [$src], $stride
vld1.8 {q13}, [$src], $stride
vld1.8 {q14}, [$src], $stride
vld1.8 {q15}, [$src], $stride
MEND
MACRO
ADD_DIFF_16x8 $diff
vqadd.u8 q8, q8, $diff
vqadd.u8 q9, q9, $diff
vqadd.u8 q10, q10, $diff
vqadd.u8 q11, q11, $diff
vqadd.u8 q12, q12, $diff
vqadd.u8 q13, q13, $diff
vqadd.u8 q14, q14, $diff
vqadd.u8 q15, q15, $diff
MEND
MACRO
SUB_DIFF_16x8 $diff
vqsub.u8 q8, q8, $diff
vqsub.u8 q9, q9, $diff
vqsub.u8 q10, q10, $diff
vqsub.u8 q11, q11, $diff
vqsub.u8 q12, q12, $diff
vqsub.u8 q13, q13, $diff
vqsub.u8 q14, q14, $diff
vqsub.u8 q15, q15, $diff
MEND
MACRO
ST_16x8 $dst, $stride
vst1.8 {q8}, [$dst], $stride
vst1.8 {q9}, [$dst], $stride
vst1.8 {q10},[$dst], $stride
vst1.8 {q11},[$dst], $stride
vst1.8 {q12},[$dst], $stride
vst1.8 {q13},[$dst], $stride
vst1.8 {q14},[$dst], $stride
vst1.8 {q15},[$dst], $stride
MEND
;void aom_idct32x32_1_add_neon(int16_t *input, uint8_t *dest,
; int dest_stride)
;
; r0 int16_t input
; r1 uint8_t *dest
; r2 int dest_stride
|aom_idct32x32_1_add_neon| PROC
push {lr}
pld [r1]
add r3, r1, #16 ; r3 dest + 16 for second loop
ldrsh r0, [r0]
; generate cospi_16_64 = 11585
mov r12, #0x2d00
add r12, #0x41
; out = dct_const_round_shift(input[0] * cospi_16_64)
mul r0, r0, r12 ; input[0] * cospi_16_64
add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1))
asr r0, r0, #14 ; >> DCT_CONST_BITS
; out = dct_const_round_shift(out * cospi_16_64)
mul r0, r0, r12 ; out * cospi_16_64
mov r12, r1 ; save dest
add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1))
asr r0, r0, #14 ; >> DCT_CONST_BITS
; a1 = ROUND_POWER_OF_TWO(out, 6)
add r0, r0, #32 ; + (1 <<((6) - 1))
asrs r0, r0, #6 ; >> 6
bge diff_positive_32_32
diff_negative_32_32
neg r0, r0
usat r0, #8, r0
vdup.u8 q0, r0
mov r0, #4
diff_negative_32_32_loop
sub r0, #1
LD_16x8 r1, r2
SUB_DIFF_16x8 q0
ST_16x8 r12, r2
LD_16x8 r1, r2
SUB_DIFF_16x8 q0
ST_16x8 r12, r2
cmp r0, #2
moveq r1, r3
moveq r12, r3
cmp r0, #0
bne diff_negative_32_32_loop
pop {pc}
diff_positive_32_32
usat r0, #8, r0
vdup.u8 q0, r0
mov r0, #4
diff_positive_32_32_loop
sub r0, #1
LD_16x8 r1, r2
ADD_DIFF_16x8 q0
ST_16x8 r12, r2
LD_16x8 r1, r2
ADD_DIFF_16x8 q0
ST_16x8 r12, r2
cmp r0, #2
moveq r1, r3
moveq r12, r3
cmp r0, #0
bne diff_positive_32_32_loop
pop {pc}
ENDP ; |aom_idct32x32_1_add_neon|
END
|
