e2dffe1e464f716cb38f039a1f6adbf2d7ed73e2
[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 "libavcodec/cabac.h"
33
34 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
35 //as that would make optimization work hard)
36 #if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS)
37 static int decode_significance_x86(CABACContext *c, int max_coeff,
38 uint8_t *significant_coeff_ctx_base,
39 int *index, x86_reg last_off){
40 void *end= significant_coeff_ctx_base + max_coeff - 1;
41 int minusstart= -(int)significant_coeff_ctx_base;
42 int minusindex= 4-(int)index;
43 int coeff_count;
44 __asm__ volatile(
45 "movl "RANGE "(%3), %%esi \n\t"
46 "movl "LOW "(%3), %%ebx \n\t"
47
48 "2: \n\t"
49
50 BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
51 "%%bx", "%%esi", "%%eax", "%%al")
52
53 "test $1, %%edx \n\t"
54 " jz 3f \n\t"
55 "add %7, %1 \n\t"
56
57 BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
58 "%%bx", "%%esi", "%%eax", "%%al")
59
60 "sub %7, %1 \n\t"
61 "mov %2, %%"REG_a" \n\t"
62 "movl %4, %%ecx \n\t"
63 "add %1, %%"REG_c" \n\t"
64 "movl %%ecx, (%%"REG_a") \n\t"
65
66 "test $1, %%edx \n\t"
67 " jnz 4f \n\t"
68
69 "add $4, %%"REG_a" \n\t"
70 "mov %%"REG_a", %2 \n\t"
71
72 "3: \n\t"
73 "add $1, %1 \n\t"
74 "cmp %5, %1 \n\t"
75 " jb 2b \n\t"
76 "mov %2, %%"REG_a" \n\t"
77 "movl %4, %%ecx \n\t"
78 "add %1, %%"REG_c" \n\t"
79 "movl %%ecx, (%%"REG_a") \n\t"
80 "4: \n\t"
81 "add %6, %%eax \n\t"
82 "shr $2, %%eax \n\t"
83
84 "movl %%esi, "RANGE "(%3) \n\t"
85 "movl %%ebx, "LOW "(%3) \n\t"
86 :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
87 :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off)
88 : "%"REG_c, "%ebx", "%edx", "%esi", "memory"
89 );
90 return coeff_count;
91 }
92
93 static int decode_significance_8x8_x86(CABACContext *c,
94 uint8_t *significant_coeff_ctx_base,
95 int *index, x86_reg last_off, const uint8_t *sig_off){
96 int minusindex= 4-(int)index;
97 int coeff_count;
98 x86_reg last=0;
99 __asm__ volatile(
100 "movl "RANGE "(%3), %%esi \n\t"
101 "movl "LOW "(%3), %%ebx \n\t"
102
103 "mov %1, %%"REG_D" \n\t"
104 "2: \n\t"
105
106 "mov %6, %%"REG_a" \n\t"
107 "movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t"
108 "add %5, %%"REG_D" \n\t"
109
110 BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
111 "%%bx", "%%esi", "%%eax", "%%al")
112
113 "mov %1, %%edi \n\t"
114 "test $1, %%edx \n\t"
115 " jz 3f \n\t"
116
117 "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
118 "add %5, %%"REG_D" \n\t"
119 "add %7, %%"REG_D" \n\t"
120
121 BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
122 "%%bx", "%%esi", "%%eax", "%%al")
123
124 "mov %2, %%"REG_a" \n\t"
125 "mov %1, %%edi \n\t"
126 "movl %%edi, (%%"REG_a") \n\t"
127
128 "test $1, %%edx \n\t"
129 " jnz 4f \n\t"
130
131 "add $4, %%"REG_a" \n\t"
132 "mov %%"REG_a", %2 \n\t"
133
134 "3: \n\t"
135 "addl $1, %%edi \n\t"
136 "mov %%edi, %1 \n\t"
137 "cmpl $63, %%edi \n\t"
138 " jb 2b \n\t"
139 "mov %2, %%"REG_a" \n\t"
140 "movl %%edi, (%%"REG_a") \n\t"
141 "4: \n\t"
142 "addl %4, %%eax \n\t"
143 "shr $2, %%eax \n\t"
144
145 "movl %%esi, "RANGE "(%3) \n\t"
146 "movl %%ebx, "LOW "(%3) \n\t"
147 :"=&a"(coeff_count),"+m"(last), "+m"(index)
148 :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_off)
149 : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
150 );
151 return coeff_count;
152 }
153 #endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */
154 /* !defined(BROKEN_RELOCATIONS) */
155
156 #endif /* AVCODEC_X86_H264_I386_H */