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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
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  );
59 #endif
60 
61  __asm__ volatile(
62  "3: \n\t"
63 
64  BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
65  "%5", "%q5", "%k0", "%b0",
66  "%c11(%6)", "%c12(%6)",
67  AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
68  AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
69  AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
70  "%13")
71 
72  "test $1, %4 \n\t"
73  " jz 4f \n\t"
74  "add %10, %1 \n\t"
75 
76  BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
77  "%5", "%q5", "%k0", "%b0",
78  "%c11(%6)", "%c12(%6)",
79  AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
80  AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
81  AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
82  "%13")
83 
84  "sub %10, %1 \n\t"
85  "mov %2, %0 \n\t"
86  "movl %7, %%ecx \n\t"
87  "add %1, %%"REG_c" \n\t"
88  "movl %%ecx, (%0) \n\t"
89 
90  "test $1, %4 \n\t"
91  " jnz 5f \n\t"
92 
93  "add"OPSIZE" $4, %2 \n\t"
94 
95  "4: \n\t"
96  "add $1, %1 \n\t"
97  "cmp %8, %1 \n\t"
98  " jb 3b \n\t"
99  "mov %2, %0 \n\t"
100  "movl %7, %%ecx \n\t"
101  "add %1, %%"REG_c" \n\t"
102  "movl %%ecx, (%0) \n\t"
103  "5: \n\t"
104  "add %9, %k0 \n\t"
105  "shr $2, %k0 \n\t"
106  : "=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
107  "+&r"(c->low), "=&r"(bit), "+&r"(c->range)
108  : "r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
109  "i"(offsetof(CABACContext, bytestream)),
110  "i"(offsetof(CABACContext, bytestream_end))
111  TABLES_ARG
112  : "%"REG_c, "memory"
113  );
114  return coeff_count;
115 }
116 
117 #define decode_significance_8x8 decode_significance_8x8_x86
118 static int decode_significance_8x8_x86(CABACContext *c,
119  uint8_t *significant_coeff_ctx_base,
120  int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
121  int minusindex= 4-(intptr_t)index;
122  int bit;
123  x86_reg coeff_count;
124  x86_reg last=0;
125  x86_reg state;
126 
127 #ifdef BROKEN_RELOCATIONS
128  void *tables;
129 
130  __asm__ volatile(
131  "lea "MANGLE(ff_h264_cabac_tables)", %0 \n\t"
132  : "=&r"(tables)
133  );
134 #endif
135 
136  __asm__ volatile(
137  "mov %1, %6 \n\t"
138  "3: \n\t"
139 
140  "mov %10, %0 \n\t"
141  "movzbl (%0, %6), %k6 \n\t"
142  "add %9, %6 \n\t"
143 
144  BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
145  "%5", "%q5", "%k0", "%b0",
146  "%c12(%7)", "%c13(%7)",
147  AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
148  AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
149  AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
150  "%15")
151 
152  "mov %1, %k6 \n\t"
153  "test $1, %4 \n\t"
154  " jz 4f \n\t"
155 
156 #ifdef BROKEN_RELOCATIONS
157  "movzbl %c14(%15, %q6), %k6\n\t"
158 #else
159  "movzbl "MANGLE(ff_h264_cabac_tables)"+%c14(%k6), %k6\n\t"
160 #endif
161  "add %11, %6 \n\t"
162 
163  BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
164  "%5", "%q5", "%k0", "%b0",
165  "%c12(%7)", "%c13(%7)",
166  AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
167  AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
168  AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
169  "%15")
170 
171  "mov %2, %0 \n\t"
172  "mov %1, %k6 \n\t"
173  "movl %k6, (%0) \n\t"
174 
175  "test $1, %4 \n\t"
176  " jnz 5f \n\t"
177 
178  "add"OPSIZE" $4, %2 \n\t"
179 
180  "4: \n\t"
181  "addl $1, %k6 \n\t"
182  "mov %k6, %1 \n\t"
183  "cmpl $63, %k6 \n\t"
184  " jb 3b \n\t"
185  "mov %2, %0 \n\t"
186  "movl %k6, (%0) \n\t"
187  "5: \n\t"
188  "addl %8, %k0 \n\t"
189  "shr $2, %k0 \n\t"
190  : "=&q"(coeff_count), "+m"(last), "+m"(index), "+&r"(c->low),
191  "=&r"(bit), "+&r"(c->range), "=&r"(state)
192  : "r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base),
193  "m"(sig_off), "m"(last_coeff_ctx_base),
194  "i"(offsetof(CABACContext, bytestream)),
195  "i"(offsetof(CABACContext, bytestream_end)),
196  "i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET) TABLES_ARG
197  : "%"REG_c, "memory"
198  );
199  return coeff_count;
200 }
201 #endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
202 
203 #endif /* HAVE_INLINE_ASM */
204 #endif /* AVCODEC_X86_H264_I386_H */
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