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h264_i386.h
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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 FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 #if HAVE_INLINE_ASM
38 
39 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
40 //as that would make optimization work hard)
41 #if HAVE_7REGS && !BROKEN_COMPILER
42 #define decode_significance decode_significance_x86
43 static int decode_significance_x86(CABACContext *c, int max_coeff,
44  uint8_t *significant_coeff_ctx_base,
45  int *index, x86_reg last_off){
46  void *end= significant_coeff_ctx_base + max_coeff - 1;
47  int minusstart= -(intptr_t)significant_coeff_ctx_base;
48  int minusindex= 4-(intptr_t)index;
49  int bit;
50  x86_reg coeff_count;
51 
52 #ifdef BROKEN_RELOCATIONS
53  void *tables;
54 
55  __asm__ volatile(
56  "lea "MANGLE(ff_h264_cabac_tables)", %0 \n\t"
57  : "=&r"(tables)
58  : NAMED_CONSTRAINTS_ARRAY(ff_h264_cabac_tables)
59  );
60 #endif
61 
62  __asm__ volatile(
63  "3: \n\t"
64 
65  BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
66  "%5", "%q5", "%k0", "%b0",
67  "%c11(%6)", "%c12(%6)",
68  AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
69  AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
70  AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
71  "%13")
72 
73  "test $1, %4 \n\t"
74  " jz 4f \n\t"
75  "add %10, %1 \n\t"
76 
77  BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
78  "%5", "%q5", "%k0", "%b0",
79  "%c11(%6)", "%c12(%6)",
80  AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
81  AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
82  AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
83  "%13")
84 
85  "sub %10, %1 \n\t"
86  "mov %2, %0 \n\t"
87  "movl %7, %%ecx \n\t"
88  "add %1, %%"REG_c" \n\t"
89  "movl %%ecx, (%0) \n\t"
90 
91  "test $1, %4 \n\t"
92  " jnz 5f \n\t"
93 
94  "add"OPSIZE" $4, %2 \n\t"
95 
96  "4: \n\t"
97  "add $1, %1 \n\t"
98  "cmp %8, %1 \n\t"
99  " jb 3b \n\t"
100  "mov %2, %0 \n\t"
101  "movl %7, %%ecx \n\t"
102  "add %1, %%"REG_c" \n\t"
103  "movl %%ecx, (%0) \n\t"
104  "5: \n\t"
105  "add %9, %k0 \n\t"
106  "shr $2, %k0 \n\t"
107  : "=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
108  "+&r"(c->low), "=&r"(bit), "+&r"(c->range)
109  : "r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
110  "i"(offsetof(CABACContext, bytestream)),
111  "i"(offsetof(CABACContext, bytestream_end))
112  TABLES_ARG
113  : "%"REG_c, "memory"
114  );
115  return coeff_count;
116 }
117 
118 #define decode_significance_8x8 decode_significance_8x8_x86
119 static int decode_significance_8x8_x86(CABACContext *c,
120  uint8_t *significant_coeff_ctx_base,
121  int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
122  int minusindex= 4-(intptr_t)index;
123  int bit;
124  x86_reg coeff_count;
125  x86_reg last=0;
126  x86_reg state;
127 
128 #ifdef BROKEN_RELOCATIONS
129  void *tables;
130 
131  __asm__ volatile(
132  "lea "MANGLE(ff_h264_cabac_tables)", %0 \n\t"
133  : "=&r"(tables)
134  : NAMED_CONSTRAINTS_ARRAY(ff_h264_cabac_tables)
135  );
136 #endif
137 
138  __asm__ volatile(
139  "mov %1, %6 \n\t"
140  "3: \n\t"
141 
142  "mov %10, %0 \n\t"
143  "movzbl (%0, %6), %k6 \n\t"
144  "add %9, %6 \n\t"
145 
146  BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
147  "%5", "%q5", "%k0", "%b0",
148  "%c12(%7)", "%c13(%7)",
149  AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
150  AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
151  AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
152  "%15")
153 
154  "mov %1, %k6 \n\t"
155  "test $1, %4 \n\t"
156  " jz 4f \n\t"
157 
158 #ifdef BROKEN_RELOCATIONS
159  "movzbl %c14(%15, %q6), %k6\n\t"
160 #else
161  "movzbl "MANGLE(ff_h264_cabac_tables)"+%c14(%k6), %k6\n\t"
162 #endif
163  "add %11, %6 \n\t"
164 
165  BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
166  "%5", "%q5", "%k0", "%b0",
167  "%c12(%7)", "%c13(%7)",
168  AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
169  AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
170  AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
171  "%15")
172 
173  "mov %2, %0 \n\t"
174  "mov %1, %k6 \n\t"
175  "movl %k6, (%0) \n\t"
176 
177  "test $1, %4 \n\t"
178  " jnz 5f \n\t"
179 
180  "add"OPSIZE" $4, %2 \n\t"
181 
182  "4: \n\t"
183  "addl $1, %k6 \n\t"
184  "mov %k6, %1 \n\t"
185  "cmpl $63, %k6 \n\t"
186  " jb 3b \n\t"
187  "mov %2, %0 \n\t"
188  "movl %k6, (%0) \n\t"
189  "5: \n\t"
190  "addl %8, %k0 \n\t"
191  "shr $2, %k0 \n\t"
192  : "=&q"(coeff_count), "+m"(last), "+m"(index), "+&r"(c->low),
193  "=&r"(bit), "+&r"(c->range), "=&r"(state)
194  : "r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base),
195  "m"(sig_off), "m"(last_coeff_ctx_base),
196  "i"(offsetof(CABACContext, bytestream)),
197  "i"(offsetof(CABACContext, bytestream_end)),
198  "i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET) TABLES_ARG
199  : "%"REG_c, "memory"
200  );
201  return coeff_count;
202 }
203 #endif /* HAVE_7REGS && BROKEN_COMPILER */
204 
205 #endif /* HAVE_INLINE_ASM */
206 #endif /* AVCODEC_X86_H264_I386_H */
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