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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
;
; 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_variance_halfpixvar16x16_hv_media|
ARM
REQUIRE8
PRESERVE8
AREA ||.text||, CODE, READONLY, ALIGN=2
; r0 unsigned char *src_ptr
; r1 int source_stride
; r2 unsigned char *ref_ptr
; r3 int recon_stride
; stack unsigned int *sse
|aom_variance_halfpixvar16x16_hv_media| PROC
stmfd sp!, {r4-r12, lr}
pld [r0, r1, lsl #0]
pld [r2, r3, lsl #0]
mov r8, #0 ; initialize sum = 0
ldr r10, c80808080
mov r11, #0 ; initialize sse = 0
mov r12, #16 ; set loop counter to 16 (=block height)
mov lr, #0 ; constant zero
loop
add r9, r0, r1 ; pointer to pixels on the next row
; 1st 4 pixels
ldr r4, [r0, #0] ; load source pixels a, row N
ldr r6, [r0, #1] ; load source pixels b, row N
ldr r5, [r9, #0] ; load source pixels c, row N+1
ldr r7, [r9, #1] ; load source pixels d, row N+1
; x = (a + b + 1) >> 1, interpolate pixels horizontally on row N
mvn r6, r6
uhsub8 r4, r4, r6
eor r4, r4, r10
; y = (c + d + 1) >> 1, interpolate pixels horizontally on row N+1
mvn r7, r7
uhsub8 r5, r5, r7
eor r5, r5, r10
; z = (x + y + 1) >> 1, interpolate half pixel values vertically
mvn r5, r5
uhsub8 r4, r4, r5
ldr r5, [r2, #0] ; load 4 ref pixels
eor r4, r4, r10
usub8 r6, r4, r5 ; calculate difference
pld [r0, r1, lsl #1]
sel r7, r6, lr ; select bytes with positive difference
usub8 r6, r5, r4 ; calculate difference with reversed operands
pld [r2, r3, lsl #1]
sel r6, r6, lr ; select bytes with negative difference
; calculate partial sums
usad8 r4, r7, lr ; calculate sum of positive differences
usad8 r5, r6, lr ; calculate sum of negative differences
orr r6, r6, r7 ; differences of all 4 pixels
; calculate total sum
adds r8, r8, r4 ; add positive differences to sum
subs r8, r8, r5 ; subtract negative differences from sum
; calculate sse
uxtb16 r5, r6 ; byte (two pixels) to halfwords
uxtb16 r7, r6, ror #8 ; another two pixels to halfwords
smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1)
; 2nd 4 pixels
ldr r4, [r0, #4] ; load source pixels a, row N
ldr r6, [r0, #5] ; load source pixels b, row N
ldr r5, [r9, #4] ; load source pixels c, row N+1
smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2)
ldr r7, [r9, #5] ; load source pixels d, row N+1
; x = (a + b + 1) >> 1, interpolate pixels horizontally on row N
mvn r6, r6
uhsub8 r4, r4, r6
eor r4, r4, r10
; y = (c + d + 1) >> 1, interpolate pixels horizontally on row N+1
mvn r7, r7
uhsub8 r5, r5, r7
eor r5, r5, r10
; z = (x + y + 1) >> 1, interpolate half pixel values vertically
mvn r5, r5
uhsub8 r4, r4, r5
ldr r5, [r2, #4] ; load 4 ref pixels
eor r4, r4, r10
usub8 r6, r4, r5 ; calculate difference
sel r7, r6, lr ; select bytes with positive difference
usub8 r6, r5, r4 ; calculate difference with reversed operands
sel r6, r6, lr ; select bytes with negative difference
; calculate partial sums
usad8 r4, r7, lr ; calculate sum of positive differences
usad8 r5, r6, lr ; calculate sum of negative differences
orr r6, r6, r7 ; differences of all 4 pixels
; calculate total sum
add r8, r8, r4 ; add positive differences to sum
sub r8, r8, r5 ; subtract negative differences from sum
; calculate sse
uxtb16 r5, r6 ; byte (two pixels) to halfwords
uxtb16 r7, r6, ror #8 ; another two pixels to halfwords
smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1)
; 3rd 4 pixels
ldr r4, [r0, #8] ; load source pixels a, row N
ldr r6, [r0, #9] ; load source pixels b, row N
ldr r5, [r9, #8] ; load source pixels c, row N+1
smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2)
ldr r7, [r9, #9] ; load source pixels d, row N+1
; x = (a + b + 1) >> 1, interpolate pixels horizontally on row N
mvn r6, r6
uhsub8 r4, r4, r6
eor r4, r4, r10
; y = (c + d + 1) >> 1, interpolate pixels horizontally on row N+1
mvn r7, r7
uhsub8 r5, r5, r7
eor r5, r5, r10
; z = (x + y + 1) >> 1, interpolate half pixel values vertically
mvn r5, r5
uhsub8 r4, r4, r5
ldr r5, [r2, #8] ; load 4 ref pixels
eor r4, r4, r10
usub8 r6, r4, r5 ; calculate difference
sel r7, r6, lr ; select bytes with positive difference
usub8 r6, r5, r4 ; calculate difference with reversed operands
sel r6, r6, lr ; select bytes with negative difference
; calculate partial sums
usad8 r4, r7, lr ; calculate sum of positive differences
usad8 r5, r6, lr ; calculate sum of negative differences
orr r6, r6, r7 ; differences of all 4 pixels
; calculate total sum
add r8, r8, r4 ; add positive differences to sum
sub r8, r8, r5 ; subtract negative differences from sum
; calculate sse
uxtb16 r5, r6 ; byte (two pixels) to halfwords
uxtb16 r7, r6, ror #8 ; another two pixels to halfwords
smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1)
; 4th 4 pixels
ldr r4, [r0, #12] ; load source pixels a, row N
ldr r6, [r0, #13] ; load source pixels b, row N
ldr r5, [r9, #12] ; load source pixels c, row N+1
smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2)
ldr r7, [r9, #13] ; load source pixels d, row N+1
; x = (a + b + 1) >> 1, interpolate pixels horizontally on row N
mvn r6, r6
uhsub8 r4, r4, r6
eor r4, r4, r10
; y = (c + d + 1) >> 1, interpolate pixels horizontally on row N+1
mvn r7, r7
uhsub8 r5, r5, r7
eor r5, r5, r10
; z = (x + y + 1) >> 1, interpolate half pixel values vertically
mvn r5, r5
uhsub8 r4, r4, r5
ldr r5, [r2, #12] ; load 4 ref pixels
eor r4, r4, r10
usub8 r6, r4, r5 ; calculate difference
add r0, r0, r1 ; set src_ptr to next row
sel r7, r6, lr ; select bytes with positive difference
usub8 r6, r5, r4 ; calculate difference with reversed operands
add r2, r2, r3 ; set dst_ptr to next row
sel r6, r6, lr ; select bytes with negative difference
; calculate partial sums
usad8 r4, r7, lr ; calculate sum of positive differences
usad8 r5, r6, lr ; calculate sum of negative differences
orr r6, r6, r7 ; differences of all 4 pixels
; calculate total sum
add r8, r8, r4 ; add positive differences to sum
sub r8, r8, r5 ; subtract negative differences from sum
; calculate sse
uxtb16 r5, r6 ; byte (two pixels) to halfwords
uxtb16 r7, r6, ror #8 ; another two pixels to halfwords
smlad r11, r5, r5, r11 ; dual signed multiply, add and accumulate (1)
subs r12, r12, #1
smlad r11, r7, r7, r11 ; dual signed multiply, add and accumulate (2)
bne loop
; return stuff
ldr r6, [sp, #40] ; get address of sse
mul r0, r8, r8 ; sum * sum
str r11, [r6] ; store sse
sub r0, r11, r0, lsr #8 ; return (sse - ((sum * sum) >> 8))
ldmfd sp!, {r4-r12, pc}
ENDP
c80808080
DCD 0x80808080
END
|