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1 | /* |
2 | * Copyright (C) 2010 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 | #ifndef AVCODEC_ARM_VP56_ARITH_H | |
22 | #define AVCODEC_ARM_VP56_ARITH_H | |
23 | ||
24 | #if CONFIG_THUMB | |
25 | # define A(x) | |
26 | # define T(x) x | |
27 | #else | |
28 | # define A(x) x | |
29 | # define T(x) | |
30 | #endif | |
31 | ||
32 | #if CONFIG_THUMB || defined __clang__ | |
33 | # define L(x) | |
34 | # define U(x) x | |
35 | #else | |
36 | # define L(x) x | |
37 | # define U(x) | |
38 | #endif | |
39 | ||
40 | #if HAVE_ARMV6_INLINE | |
41 | ||
42 | #define vp56_rac_get_prob vp56_rac_get_prob_armv6 | |
43 | static inline int vp56_rac_get_prob_armv6(VP56RangeCoder *c, int pr) | |
44 | { | |
45 | unsigned shift = ff_vp56_norm_shift[c->high]; | |
46 | unsigned code_word = c->code_word << shift; | |
47 | unsigned high = c->high << shift; | |
48 | unsigned bit; | |
49 | ||
50 | __asm__ ("adds %3, %3, %0 \n" | |
51 | "itt cs \n" | |
52 | "cmpcs %7, %4 \n" | |
53 | L("ldrcsh %2, [%4], #2 \n") | |
54 | U("ldrhcs %2, [%4], #2 \n") | |
55 | "rsb %0, %6, #256 \n" | |
56 | "smlabb %0, %5, %6, %0 \n" | |
57 | T("itttt cs \n") | |
58 | "rev16cs %2, %2 \n" | |
59 | T("lslcs %2, %2, %3 \n") | |
60 | T("orrcs %1, %1, %2 \n") | |
61 | A("orrcs %1, %1, %2, lsl %3 \n") | |
62 | "subcs %3, %3, #16 \n" | |
63 | "lsr %0, %0, #8 \n" | |
64 | "cmp %1, %0, lsl #16 \n" | |
65 | "ittte ge \n" | |
66 | "subge %1, %1, %0, lsl #16 \n" | |
67 | "subge %0, %5, %0 \n" | |
68 | "movge %2, #1 \n" | |
69 | "movlt %2, #0 \n" | |
70 | : "=&r"(c->high), "=&r"(c->code_word), "=&r"(bit), | |
71 | "+&r"(c->bits), "+&r"(c->buffer) | |
72 | : "r"(high), "r"(pr), "r"(c->end - 1), | |
73 | "0"(shift), "1"(code_word) | |
74 | : "cc"); | |
75 | ||
76 | return bit; | |
77 | } | |
78 | ||
79 | #define vp56_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6 | |
80 | static inline int vp56_rac_get_prob_branchy_armv6(VP56RangeCoder *c, int pr) | |
81 | { | |
82 | unsigned shift = ff_vp56_norm_shift[c->high]; | |
83 | unsigned code_word = c->code_word << shift; | |
84 | unsigned high = c->high << shift; | |
85 | unsigned low; | |
86 | unsigned tmp; | |
87 | ||
88 | __asm__ ("adds %3, %3, %0 \n" | |
89 | "itt cs \n" | |
90 | "cmpcs %7, %4 \n" | |
91 | L("ldrcsh %2, [%4], #2 \n") | |
92 | U("ldrhcs %2, [%4], #2 \n") | |
93 | "rsb %0, %6, #256 \n" | |
94 | "smlabb %0, %5, %6, %0 \n" | |
95 | T("itttt cs \n") | |
96 | "rev16cs %2, %2 \n" | |
97 | T("lslcs %2, %2, %3 \n") | |
98 | T("orrcs %1, %1, %2 \n") | |
99 | A("orrcs %1, %1, %2, lsl %3 \n") | |
100 | "subcs %3, %3, #16 \n" | |
101 | "lsr %0, %0, #8 \n" | |
102 | "lsl %2, %0, #16 \n" | |
103 | : "=&r"(low), "+&r"(code_word), "=&r"(tmp), | |
104 | "+&r"(c->bits), "+&r"(c->buffer) | |
105 | : "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift) | |
106 | : "cc"); | |
107 | ||
108 | if (code_word >= tmp) { | |
109 | c->high = high - low; | |
110 | c->code_word = code_word - tmp; | |
111 | return 1; | |
112 | } | |
113 | ||
114 | c->high = low; | |
115 | c->code_word = code_word; | |
116 | return 0; | |
117 | } | |
118 | ||
119 | #endif | |
120 | ||
121 | #endif /* AVCODEC_ARM_VP56_ARITH_H */ |