2 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of Libav.
6 * Libav 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.
11 * Libav 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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_X86_CABAC_H
22 #define AVCODEC_X86_CABAC_H
24 #include "libavcodec/cabac.h"
25 #include "libavutil/attributes.h"
26 #include "libavutil/x86/asm.h"
27 #include "libavutil/internal.h"
30 #if (defined(__i386) && defined(__clang__) && (__clang_major__<2 || (__clang_major__==2 && __clang_minor__<10)))\
31 || ( !defined(__clang__) && defined(__llvm__) && __GNUC__==4 && __GNUC_MINOR__==2 && __GNUC_PATCHLEVEL__<=1)
32 # define BROKEN_COMPILER 1
34 # define BROKEN_COMPILER 0
39 #ifdef BROKEN_RELOCATIONS
40 #define TABLES_ARG , "r"(tables)
43 #define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \
44 "cmp "low" , "tmp" \n\t"\
45 "cmova %%ecx , "range" \n\t"\
46 "sbb %%rcx , %%rcx \n\t"\
47 "and %%ecx , "tmp" \n\t"\
48 "xor %%rcx , "retq" \n\t"\
49 "sub "tmp" , "low" \n\t"
50 #else /* HAVE_FAST_CMOV */
51 #define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \
52 /* P4 Prescott has crappy cmov,sbb,64bit shift so avoid them */ \
53 "sub "low" , "tmp" \n\t"\
54 "sar $31 , "tmp" \n\t"\
55 "sub %%ecx , "range" \n\t"\
56 "and "tmp" , "range" \n\t"\
57 "add %%ecx , "range" \n\t"\
58 "shl $17 , %%ecx \n\t"\
59 "and "tmp" , %%ecx \n\t"\
60 "sub %%ecx , "low" \n\t"\
61 "xor "tmp" , "ret" \n\t"\
62 "movslq "ret" , "retq" \n\t"
63 #endif /* HAVE_FAST_CMOV */
65 #define BRANCHLESS_GET_CABAC(ret, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \
66 "movzbl "statep" , "ret" \n\t"\
67 "mov "range" , "tmp" \n\t"\
68 "and $0xC0 , "range" \n\t"\
69 "lea ("ret", "range", 2), %%ecx \n\t"\
70 "movzbl "lps_off"("tables", %%rcx), "range" \n\t"\
71 "sub "range" , "tmp" \n\t"\
72 "mov "tmp" , %%ecx \n\t"\
73 "shl $17 , "tmp" \n\t"\
74 BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \
75 "movzbl "norm_off"("tables", "rangeq"), %%ecx \n\t"\
76 "shl %%cl , "range" \n\t"\
77 "movzbl "mlps_off"+128("tables", "retq"), "tmp" \n\t"\
78 "shl %%cl , "low" \n\t"\
79 "mov "tmpbyte" , "statep" \n\t"\
80 "test "lowword" , "lowword" \n\t"\
82 "mov "byte" , %%"REG_c" \n\t"\
83 "add"OPSIZE" $2 , "byte" \n\t"\
84 "movzwl (%%"REG_c") , "tmp" \n\t"\
85 "lea -1("low") , %%ecx \n\t"\
86 "xor "low" , %%ecx \n\t"\
87 "shr $15 , %%ecx \n\t"\
89 "shr $15 , "tmp" \n\t"\
90 "movzbl "norm_off"("tables", %%rcx), %%ecx \n\t"\
91 "sub $0xFFFF , "tmp" \n\t"\
93 "add $7 , %%ecx \n\t"\
94 "shl %%cl , "tmp" \n\t"\
95 "add "tmp" , "low" \n\t"\
98 #else /* BROKEN_RELOCATIONS */
103 #define BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp)\
104 "mov "tmp" , %%ecx \n\t"\
105 "shl $17 , "tmp" \n\t"\
106 "cmp "low" , "tmp" \n\t"\
107 "cmova %%ecx , "range" \n\t"\
108 "sbb %%ecx , %%ecx \n\t"\
109 "and %%ecx , "tmp" \n\t"\
110 "xor %%ecx , "ret" \n\t"\
111 "sub "tmp" , "low" \n\t"
112 #else /* HAVE_FAST_CMOV */
113 #define BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp)\
114 "mov "tmp" , %%ecx \n\t"\
115 "shl $17 , "tmp" \n\t"\
116 "sub "low" , "tmp" \n\t"\
117 "sar $31 , "tmp" \n\t" /*lps_mask*/\
118 "sub %%ecx , "range" \n\t" /*RangeLPS - range*/\
119 "and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\
120 "add %%ecx , "range" \n\t" /*new range*/\
121 "shl $17 , %%ecx \n\t"\
122 "and "tmp" , %%ecx \n\t"\
123 "sub %%ecx , "low" \n\t"\
124 "xor "tmp" , "ret" \n\t"
125 #endif /* HAVE_FAST_CMOV */
127 #define BRANCHLESS_GET_CABAC(ret, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \
128 "movzbl "statep" , "ret" \n\t"\
129 "mov "range" , "tmp" \n\t"\
130 "and $0xC0 , "range" \n\t"\
131 "movzbl "MANGLE(ff_h264_cabac_tables)"+"lps_off"("ret", "range", 2), "range" \n\t"\
132 "sub "range" , "tmp" \n\t"\
133 BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp) \
134 "movzbl "MANGLE(ff_h264_cabac_tables)"+"norm_off"("range"), %%ecx \n\t"\
135 "shl %%cl , "range" \n\t"\
136 "movzbl "MANGLE(ff_h264_cabac_tables)"+"mlps_off"+128("ret"), "tmp" \n\t"\
137 "shl %%cl , "low" \n\t"\
138 "mov "tmpbyte" , "statep" \n\t"\
139 "test "lowword" , "lowword" \n\t"\
141 "mov "byte" , %%"REG_c" \n\t"\
142 "add"OPSIZE" $2 , "byte" \n\t"\
143 "movzwl (%%"REG_c") , "tmp" \n\t"\
144 "lea -1("low") , %%ecx \n\t"\
145 "xor "low" , %%ecx \n\t"\
146 "shr $15 , %%ecx \n\t"\
148 "shr $15 , "tmp" \n\t"\
149 "movzbl "MANGLE(ff_h264_cabac_tables)"+"norm_off"(%%ecx), %%ecx \n\t"\
150 "sub $0xFFFF , "tmp" \n\t"\
152 "add $7 , %%ecx \n\t"\
153 "shl %%cl , "tmp" \n\t"\
154 "add "tmp" , "low" \n\t"\
157 #endif /* BROKEN_RELOCATIONS */
159 #if HAVE_7REGS && !BROKEN_COMPILER
160 #define get_cabac_inline get_cabac_inline_x86
161 static av_always_inline int get_cabac_inline_x86(CABACContext *c,
162 uint8_t *const state)
165 #ifdef BROKEN_RELOCATIONS
169 "lea "MANGLE(ff_h264_cabac_tables)", %0 \n\t"
175 BRANCHLESS_GET_CABAC("%0", "%q0", "(%4)", "%1", "%w1",
176 "%2", "%q2", "%3", "%b3",
177 "%c6(%5)", "%c7(%5)",
178 AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
179 AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
180 AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
182 : "=&r"(bit), "=&r"(c->low), "=&r"(c->range), "=&q"(tmp)
183 : "r"(state), "r"(c),
184 "i"(offsetof(CABACContext, bytestream)),
185 "i"(offsetof(CABACContext, bytestream_end))
187 ,"1"(c->low), "2"(c->range)
192 #endif /* HAVE_7REGS */
194 #define get_cabac_bypass_sign get_cabac_bypass_sign_x86
195 static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val)
199 "movl %c6(%2), %k1 \n\t"
200 "movl %c3(%2), %%eax \n\t"
202 "add %%eax, %%eax \n\t"
203 "sub %k1, %%eax \n\t"
205 "and %%edx, %k1 \n\t"
206 "add %k1, %%eax \n\t"
207 "xor %%edx, %%ecx \n\t"
208 "sub %%edx, %%ecx \n\t"
209 "test %%ax, %%ax \n\t"
211 "mov %c4(%2), %1 \n\t"
212 "subl $0xFFFF, %%eax \n\t"
213 "movzwl (%1), %%edx \n\t"
215 "shrl $15, %%edx \n\t"
217 "addl %%edx, %%eax \n\t"
218 "mov %1, %c4(%2) \n\t"
220 "movl %%eax, %c3(%2) \n\t"
222 : "+c"(val), "=&r"(tmp)
224 "i"(offsetof(CABACContext, low)),
225 "i"(offsetof(CABACContext, bytestream)),
226 "i"(offsetof(CABACContext, bytestream_end)),
227 "i"(offsetof(CABACContext, range))
228 : "%eax", "%edx", "memory"
234 #define get_cabac_bypass get_cabac_bypass_x86
235 static av_always_inline int get_cabac_bypass_x86(CABACContext *c)
240 "movl %c6(%2), %k1 \n\t"
241 "movl %c3(%2), %%eax \n\t"
243 "add %%eax, %%eax \n\t"
244 "sub %k1, %%eax \n\t"
246 "and %%edx, %k1 \n\t"
247 "add %k1, %%eax \n\t"
249 "test %%ax, %%ax \n\t"
251 "mov %c4(%2), %1 \n\t"
252 "subl $0xFFFF, %%eax \n\t"
253 "movzwl (%1), %%ecx \n\t"
255 "shrl $15, %%ecx \n\t"
256 "addl %%ecx, %%eax \n\t"
257 "cmp %c5(%2), %1 \n\t"
259 "add"OPSIZE" $2, %c4(%2) \n\t"
261 "movl %%eax, %c3(%2) \n\t"
263 : "=&d"(res), "=&r"(tmp)
265 "i"(offsetof(CABACContext, low)),
266 "i"(offsetof(CABACContext, bytestream)),
267 "i"(offsetof(CABACContext, bytestream_end)),
268 "i"(offsetof(CABACContext, range))
269 : "%eax", "%ecx", "memory"
273 #endif /* !BROKEN_COMPILER */
275 #endif /* HAVE_INLINE_ASM */
276 #endif /* AVCODEC_X86_CABAC_H */