21 #ifndef AVCODEC_X86_CABAC_H
22 #define AVCODEC_X86_CABAC_H
32 #ifdef BROKEN_RELOCATIONS
33 #define TABLES_ARG , "r"(tables)
36 #define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \
37 "cmp "low" , "tmp" \n\t"\
38 "cmova %%ecx , "range" \n\t"\
39 "sbb %%rcx , %%rcx \n\t"\
40 "and %%ecx , "tmp" \n\t"\
41 "xor %%rcx , "retq" \n\t"\
42 "sub "tmp" , "low" \n\t"
44 #define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \
46 "sub "low" , "tmp" \n\t"\
47 "sar $31 , "tmp" \n\t"\
48 "sub %%ecx , "range" \n\t"\
49 "and "tmp" , "range" \n\t"\
50 "add %%ecx , "range" \n\t"\
51 "shl $17 , %%ecx \n\t"\
52 "and "tmp" , %%ecx \n\t"\
53 "sub %%ecx , "low" \n\t"\
54 "xor "tmp" , "ret" \n\t"\
55 "movslq "ret" , "retq" \n\t"
58 #define BRANCHLESS_GET_CABAC(ret, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \
59 "movzbl "statep" , "ret" \n\t"\
60 "mov "range" , "tmp" \n\t"\
61 "and $0xC0 , "range" \n\t"\
62 "lea ("ret", "range", 2), %%ecx \n\t"\
63 "movzbl "lps_off"("tables", %%rcx), "range" \n\t"\
64 "sub "range" , "tmp" \n\t"\
65 "mov "tmp" , %%ecx \n\t"\
66 "shl $17 , "tmp" \n\t"\
67 BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \
68 "movzbl "norm_off"("tables", "rangeq"), %%ecx \n\t"\
69 "shl %%cl , "range" \n\t"\
70 "movzbl "mlps_off"+128("tables", "retq"), "tmp" \n\t"\
71 "shl %%cl , "low" \n\t"\
72 "mov "tmpbyte" , "statep" \n\t"\
73 "test "lowword" , "lowword" \n\t"\
75 "mov "byte" , %%"REG_c" \n\t"\
76 "cmp "end" , %%"REG_c" \n\t"\
78 "add"OPSIZE" $2 , "byte" \n\t"\
80 "movzwl (%%"REG_c") , "tmp" \n\t"\
81 "lea -1("low") , %%ecx \n\t"\
82 "xor "low" , %%ecx \n\t"\
83 "shr $15 , %%ecx \n\t"\
85 "shr $15 , "tmp" \n\t"\
86 "movzbl "norm_off"("tables", %%rcx), %%ecx \n\t"\
87 "sub $0xFFFF , "tmp" \n\t"\
89 "add $7 , %%ecx \n\t"\
90 "shl %%cl , "tmp" \n\t"\
91 "add "tmp" , "low" \n\t"\
98 #define BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp)\
99 "mov "tmp" , %%ecx \n\t"\
100 "shl $17 , "tmp" \n\t"\
101 "cmp "low" , "tmp" \n\t"\
102 "cmova %%ecx , "range" \n\t"\
103 "sbb %%ecx , %%ecx \n\t"\
104 "and %%ecx , "tmp" \n\t"\
105 "xor %%ecx , "ret" \n\t"\
106 "sub "tmp" , "low" \n\t"
108 #define BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp)\
109 "mov "tmp" , %%ecx \n\t"\
110 "shl $17 , "tmp" \n\t"\
111 "sub "low" , "tmp" \n\t"\
112 "sar $31 , "tmp" \n\t" \
113 "sub %%ecx , "range" \n\t" \
114 "and "tmp" , "range" \n\t" \
115 "add %%ecx , "range" \n\t" \
116 "shl $17 , %%ecx \n\t"\
117 "and "tmp" , %%ecx \n\t"\
118 "sub %%ecx , "low" \n\t"\
119 "xor "tmp" , "ret" \n\t"
122 #define BRANCHLESS_GET_CABAC(ret, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \
123 "movzbl "statep" , "ret" \n\t"\
124 "mov "range" , "tmp" \n\t"\
125 "and $0xC0 , "range" \n\t"\
126 "movzbl "MANGLE(ff_h264_cabac_tables)"+"lps_off"("ret", "range", 2), "range" \n\t"\
127 "sub "range" , "tmp" \n\t"\
128 BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp) \
129 "movzbl "MANGLE(ff_h264_cabac_tables)"+"norm_off"("range"), %%ecx \n\t"\
130 "shl %%cl , "range" \n\t"\
131 "movzbl "MANGLE(ff_h264_cabac_tables)"+"mlps_off"+128("ret"), "tmp" \n\t"\
132 "shl %%cl , "low" \n\t"\
133 "mov "tmpbyte" , "statep" \n\t"\
134 "test "lowword" , "lowword" \n\t"\
136 "mov "byte" , %%"REG_c" \n\t"\
137 "cmp "end" , %%"REG_c" \n\t"\
139 "add"OPSIZE" $2 , "byte" \n\t"\
141 "movzwl (%%"REG_c") , "tmp" \n\t"\
142 "lea -1("low") , %%ecx \n\t"\
143 "xor "low" , %%ecx \n\t"\
144 "shr $15 , %%ecx \n\t"\
146 "shr $15 , "tmp" \n\t"\
147 "movzbl "MANGLE(ff_h264_cabac_tables)"+"norm_off"(%%ecx), %%ecx \n\t"\
148 "sub $0xFFFF , "tmp" \n\t"\
150 "add $7 , %%ecx \n\t"\
151 "shl %%cl , "tmp" \n\t"\
152 "add "tmp" , "low" \n\t"\
159 #define get_cabac_inline get_cabac_inline_x86
164 #ifdef BROKEN_RELOCATIONS
174 BRANCHLESS_GET_CABAC(
"%0",
"%q0",
"(%4)",
"%1",
"%w1",
175 "%2",
"%q2",
"%3",
"%b3",
176 "%c6(%5)",
"%c7(%5)",
181 :
"=&r"(bit),
"+&r"(c->low),
"+&r"(c->range),
"=&q"(tmp)
182 :
"r"(
state),
"r"(c),
192 #define get_cabac_bypass_sign get_cabac_bypass_sign_x86
197 "movl %c6(%2), %k1 \n\t"
198 "movl %c3(%2), %%eax \n\t"
200 "add %%eax, %%eax \n\t"
201 "sub %k1, %%eax \n\t"
203 "and %%edx, %k1 \n\t"
204 "add %k1, %%eax \n\t"
205 "xor %%edx, %%ecx \n\t"
206 "sub %%edx, %%ecx \n\t"
207 "test %%ax, %%ax \n\t"
209 "mov %c4(%2), %1 \n\t"
210 "subl $0xFFFF, %%eax \n\t"
211 "movzwl (%1), %%edx \n\t"
213 "shrl $15, %%edx \n\t"
214 "addl %%edx, %%eax \n\t"
215 "cmp %c5(%2), %1 \n\t"
217 "add"OPSIZE
" $2, %c4(%2) \n\t"
219 "movl %%eax, %c3(%2) \n\t"
221 :
"+c"(val),
"=&r"(tmp)
227 :
"%eax",
"%edx",
"memory"
uint8_t ff_h264_cabac_tables[512+4 *2 *64+4 *64+63]
Macro definitions for various function/variable attributes.
static const uint8_t *const tables[]
common internal API header
#define H264_MLPS_STATE_OFFSET
#define H264_NORM_SHIFT_OFFSET
Context Adaptive Binary Arithmetic Coder.
#define H264_LPS_RANGE_OFFSET