media/libvpx/vp9/encoder/x86/vp9_subtract_sse2.asm@ac0c01689b40
media/libvpx/vp9/encoder/x86/vp9_subtract_sse2.asm
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 ;
2 ; Copyright (c) 2010 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 ;
11 %include "third_party/x86inc/x86inc.asm"
13 SECTION .text
15 ; void vp9_subtract_block(int rows, int cols,
16 ; int16_t *diff, ptrdiff_t diff_stride,
17 ; const uint8_t *src, ptrdiff_t src_stride,
18 ; const uint8_t *pred, ptrdiff_t pred_stride)
20 INIT_XMM sse2
21 cglobal subtract_block, 7, 7, 8, \
22 rows, cols, diff, diff_stride, src, src_stride, \
23 pred, pred_stride
24 %define pred_str colsq
25 pxor m7, m7 ; dedicated zero register
26 cmp colsd, 4
27 je .case_4
28 cmp colsd, 8
29 je .case_8
30 cmp colsd, 16
31 je .case_16
32 cmp colsd, 32
33 je .case_32
35 %macro loop16 6
36 mova m0, [srcq+%1]
37 mova m4, [srcq+%2]
38 mova m1, [predq+%3]
39 mova m5, [predq+%4]
40 punpckhbw m2, m0, m7
41 punpckhbw m3, m1, m7
42 punpcklbw m0, m7
43 punpcklbw m1, m7
44 psubw m2, m3
45 psubw m0, m1
46 punpckhbw m1, m4, m7
47 punpckhbw m3, m5, m7
48 punpcklbw m4, m7
49 punpcklbw m5, m7
50 psubw m1, m3
51 psubw m4, m5
52 mova [diffq+mmsize*0+%5], m0
53 mova [diffq+mmsize*1+%5], m2
54 mova [diffq+mmsize*0+%6], m4
55 mova [diffq+mmsize*1+%6], m1
56 %endmacro
58 mov pred_str, pred_stridemp
59 .loop_64:
60 loop16 0*mmsize, 1*mmsize, 0*mmsize, 1*mmsize, 0*mmsize, 2*mmsize
61 loop16 2*mmsize, 3*mmsize, 2*mmsize, 3*mmsize, 4*mmsize, 6*mmsize
62 lea diffq, [diffq+diff_strideq*2]
63 add predq, pred_str
64 add srcq, src_strideq
65 dec rowsd
66 jg .loop_64
67 RET
69 .case_32:
70 mov pred_str, pred_stridemp
71 .loop_32:
72 loop16 0, mmsize, 0, mmsize, 0, 2*mmsize
73 lea diffq, [diffq+diff_strideq*2]
74 add predq, pred_str
75 add srcq, src_strideq
76 dec rowsd
77 jg .loop_32
78 RET
80 .case_16:
81 mov pred_str, pred_stridemp
82 .loop_16:
83 loop16 0, src_strideq, 0, pred_str, 0, diff_strideq*2
84 lea diffq, [diffq+diff_strideq*4]
85 lea predq, [predq+pred_str*2]
86 lea srcq, [srcq+src_strideq*2]
87 sub rowsd, 2
88 jg .loop_16
89 RET
91 %macro loop_h 0
92 movh m0, [srcq]
93 movh m2, [srcq+src_strideq]
94 movh m1, [predq]
95 movh m3, [predq+pred_str]
96 punpcklbw m0, m7
97 punpcklbw m1, m7
98 punpcklbw m2, m7
99 punpcklbw m3, m7
100 psubw m0, m1
101 psubw m2, m3
102 mova [diffq], m0
103 mova [diffq+diff_strideq*2], m2
104 %endmacro
106 .case_8:
107 mov pred_str, pred_stridemp
108 .loop_8:
109 loop_h
110 lea diffq, [diffq+diff_strideq*4]
111 lea srcq, [srcq+src_strideq*2]
112 lea predq, [predq+pred_str*2]
113 sub rowsd, 2
114 jg .loop_8
115 RET
117 INIT_MMX
118 .case_4:
119 mov pred_str, pred_stridemp
120 .loop_4:
121 loop_h
122 lea diffq, [diffq+diff_strideq*4]
123 lea srcq, [srcq+src_strideq*2]
124 lea predq, [predq+pred_str*2]
125 sub rowsd, 2
126 jg .loop_4
127 RET
