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1 | /* |
2 | * Copyright (c) 2012 Mans Rullgard <mans@mansr.com> | |
3 | * | |
4 | * This file is part of FFmpeg | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "libavutil/arm/asm.S" | |
22 | ||
23 | function flac_lpc_16_1_arm | |
24 | ldr r12, [sp] | |
25 | push {r4, lr} | |
26 | ldr r1, [r1] | |
27 | subs r12, r12, #2 | |
28 | ldr lr, [r0], #4 | |
29 | beq 2f | |
30 | it lt | |
31 | poplt {r4, pc} | |
32 | 1: | |
33 | mul r4, lr, r1 | |
34 | ldm r0, {r2, lr} | |
35 | add_sh r2, r2, r4, asr r3 | |
36 | mul r4, r2, r1 | |
37 | subs r12, r12, #2 | |
38 | add_sh lr, lr, r4, asr r3 | |
39 | stm r0!, {r2, lr} | |
40 | bgt 1b | |
41 | it lt | |
42 | poplt {r4, pc} | |
43 | 2: | |
44 | mul r4, lr, r1 | |
45 | ldr r2, [r0] | |
46 | add_sh r2, r2, r4, asr r3 | |
47 | str r2, [r0] | |
48 | pop {r4, pc} | |
49 | endfunc | |
50 | ||
51 | function flac_lpc_16_2_arm | |
52 | ldr r12, [sp] | |
53 | subs r12, r12, r2 | |
54 | it le | |
55 | bxle lr | |
56 | ||
57 | push {r4-r9, lr} | |
58 | ldm r0!, {r6, r7} | |
59 | ldm r1, {r8, r9} | |
60 | subs r12, r12, #1 | |
61 | beq 2f | |
62 | 1: | |
63 | mul r4, r6, r8 | |
64 | mul r5, r7, r8 | |
65 | mla r4, r7, r9, r4 | |
66 | ldm r0, {r6, r7} | |
67 | add_sh r6, r6, r4, asr r3 | |
68 | mla r5, r6, r9, r5 | |
69 | add_sh r7, r7, r5, asr r3 | |
70 | stm r0!, {r6, r7} | |
71 | subs r12, r12, #2 | |
72 | bgt 1b | |
73 | it lt | |
74 | poplt {r4-r9, pc} | |
75 | 2: | |
76 | mul r4, r6, r8 | |
77 | mla r4, r7, r9, r4 | |
78 | ldr r5, [r0] | |
79 | add_sh r5, r5, r4, asr r3 | |
80 | str r5, [r0] | |
81 | pop {r4-r9, pc} | |
82 | endfunc | |
83 | ||
84 | function ff_flac_lpc_16_arm, export=1 | |
85 | cmp r2, #2 | |
86 | blt flac_lpc_16_1_arm | |
87 | beq flac_lpc_16_2_arm | |
88 | ||
89 | ldr r12, [sp] | |
90 | subs r12, r12, r2 | |
91 | it le | |
92 | bxle lr | |
93 | ||
94 | push {r4-r9, lr} | |
95 | ||
96 | subs r12, r12, #1 | |
97 | beq 3f | |
98 | 1: | |
99 | sub lr, r2, #2 | |
100 | mov r4, #0 | |
101 | mov r5, #0 | |
102 | ||
103 | ldr r7, [r0], #4 | |
104 | ldr r9, [r1], #4 | |
105 | 2: | |
106 | mla r4, r7, r9, r4 | |
107 | ldm r0!, {r6, r7} | |
108 | mla r5, r6, r9, r5 | |
109 | ldm r1!, {r8, r9} | |
110 | mla r4, r6, r8, r4 | |
111 | subs lr, lr, #2 | |
112 | mla r5, r7, r8, r5 | |
113 | bgt 2b | |
114 | blt 6f | |
115 | ||
116 | mla r4, r7, r9, r4 | |
117 | ldr r7, [r0], #4 | |
118 | mla r5, r7, r9, r5 | |
119 | ldr r9, [r1], #4 | |
120 | 6: | |
121 | mla r4, r7, r9, r4 | |
122 | ldm r0, {r6, r7} | |
123 | add_sh r6, r6, r4, asr r3 | |
124 | mla r5, r6, r9, r5 | |
125 | add_sh r7, r7, r5, asr r3 | |
126 | stm r0!, {r6, r7} | |
127 | sub r0, r0, r2, lsl #2 | |
128 | sub r1, r1, r2, lsl #2 | |
129 | ||
130 | subs r12, r12, #2 | |
131 | bgt 1b | |
132 | it lt | |
133 | poplt {r4-r9, pc} | |
134 | 3: | |
135 | mov r4, #0 | |
136 | 4: | |
137 | ldr r5, [r1], #4 | |
138 | ldr r6, [r0], #4 | |
139 | mla r4, r5, r6, r4 | |
140 | subs r2, r2, #1 | |
141 | bgt 4b | |
142 | ldr r5, [r0] | |
143 | add_sh r5, r5, r4, asr r3 | |
144 | str r5, [r0] | |
145 | pop {r4-r9, pc} | |
146 | endfunc |