6cd81feae075390e8d133057d0ab62c4647dc103
[libav.git] / libavcodec / x86 / h264_i386.h
1 /*
2 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * H.264 / AVC / MPEG4 part10 codec.
25 * non-MMX i386-specific optimizations for H.264
26 * @author Michael Niedermayer <michaelni@gmx.at>
27 */
28
29 #ifndef AVCODEC_X86_H264_I386_H
30 #define AVCODEC_X86_H264_I386_H
31
32 #include <stddef.h>
33
34 #include "libavcodec/cabac.h"
35 #include "cabac.h"
36
37 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
38 //as that would make optimization work hard)
39 #if HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS)
40 static int decode_significance_x86(CABACContext *c, int max_coeff,
41 uint8_t *significant_coeff_ctx_base,
42 int *index, x86_reg last_off){
43 void *end= significant_coeff_ctx_base + max_coeff - 1;
44 int minusstart= -(intptr_t)significant_coeff_ctx_base;
45 int minusindex= 4-(intptr_t)index;
46 int bit;
47 x86_reg coeff_count;
48 __asm__ volatile(
49 "2: \n\t"
50
51 BRANCHLESS_GET_CABAC("%4", "(%1)", "%3",
52 "%w3", "%5", "%k0", "%b0", "%6")
53
54 "test $1, %4 \n\t"
55 " jz 3f \n\t"
56 "add %10, %1 \n\t"
57
58 BRANCHLESS_GET_CABAC("%4", "(%1)", "%3",
59 "%w3", "%5", "%k0", "%b0", "%6")
60
61 "sub %10, %1 \n\t"
62 "mov %2, %0 \n\t"
63 "movl %7, %%ecx \n\t"
64 "add %1, %%"REG_c" \n\t"
65 "movl %%ecx, (%0) \n\t"
66
67 "test $1, %4 \n\t"
68 " jnz 4f \n\t"
69
70 "add"OPSIZE" $4, %2 \n\t"
71
72 "3: \n\t"
73 "add $1, %1 \n\t"
74 "cmp %8, %1 \n\t"
75 " jb 2b \n\t"
76 "mov %2, %0 \n\t"
77 "movl %7, %%ecx \n\t"
78 "add %1, %%"REG_c" \n\t"
79 "movl %%ecx, (%0) \n\t"
80 "4: \n\t"
81 "add %9, %k0 \n\t"
82 "shr $2, %k0 \n\t"
83 :"=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
84 "+&r"(c->low), "=&r"(bit), "+&r"(c->range),
85 "+m"(c->bytestream)
86 :"m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off)
87 : "%"REG_c, "memory"
88 );
89 return coeff_count;
90 }
91
92 static int decode_significance_8x8_x86(CABACContext *c,
93 uint8_t *significant_coeff_ctx_base,
94 int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
95 int minusindex= 4-(intptr_t)index;
96 int bit;
97 x86_reg coeff_count;
98 x86_reg last=0;
99 x86_reg state;
100 __asm__ volatile(
101 "mov %1, %6 \n\t"
102 "2: \n\t"
103
104 "mov %10, %0 \n\t"
105 "movzbl (%0, %6), %k6 \n\t"
106 "add %9, %6 \n\t"
107
108 BRANCHLESS_GET_CABAC("%4", "(%6)", "%3",
109 "%w3", "%5", "%k0", "%b0", "%7")
110
111 "mov %1, %k6 \n\t"
112 "test $1, %4 \n\t"
113 " jz 3f \n\t"
114
115 "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%k6), %k6\n\t"
116 "add %11, %6 \n\t"
117
118 BRANCHLESS_GET_CABAC("%4", "(%6)", "%3",
119 "%w3", "%5", "%k0", "%b0", "%7")
120
121 "mov %2, %0 \n\t"
122 "mov %1, %k6 \n\t"
123 "movl %k6, (%0) \n\t"
124
125 "test $1, %4 \n\t"
126 " jnz 4f \n\t"
127
128 "add"OPSIZE" $4, %2 \n\t"
129
130 "3: \n\t"
131 "addl $1, %k6 \n\t"
132 "mov %k6, %1 \n\t"
133 "cmpl $63, %k6 \n\t"
134 " jb 2b \n\t"
135 "mov %2, %0 \n\t"
136 "movl %k6, (%0) \n\t"
137 "4: \n\t"
138 "addl %8, %k0 \n\t"
139 "shr $2, %k0 \n\t"
140 :"=&q"(coeff_count),"+m"(last), "+m"(index), "+&r"(c->low), "=&r"(bit),
141 "+&r"(c->range), "=&r"(state), "+m"(c->bytestream)
142 :"m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_coeff_ctx_base)
143 : "%"REG_c, "memory"
144 );
145 return coeff_count;
146 }
147 #endif /* HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS) */
148
149 #endif /* AVCODEC_X86_H264_I386_H */