mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
147 lines
7.0 KiB
147 lines
7.0 KiB
/* |
|
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* Libav is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with Libav; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#ifndef AVCODEC_X86_CABAC_H |
|
#define AVCODEC_X86_CABAC_H |
|
|
|
#include "libavcodec/cabac.h" |
|
#include "libavutil/attributes.h" |
|
#include "libavutil/x86_cpu.h" |
|
#include "config.h" |
|
|
|
#if HAVE_FAST_CMOV |
|
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp)\ |
|
"mov "tmp" , %%ecx \n\t"\ |
|
"shl $17 , "tmp" \n\t"\ |
|
"cmp "low" , "tmp" \n\t"\ |
|
"cmova %%ecx , "range" \n\t"\ |
|
"sbb %%ecx , %%ecx \n\t"\ |
|
"and %%ecx , "tmp" \n\t"\ |
|
"xor %%ecx , "ret" \n\t"\ |
|
"sub "tmp" , "low" \n\t" |
|
#else /* HAVE_FAST_CMOV */ |
|
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp)\ |
|
"mov "tmp" , %%ecx \n\t"\ |
|
"shl $17 , "tmp" \n\t"\ |
|
"sub "low" , "tmp" \n\t"\ |
|
"sar $31 , "tmp" \n\t" /*lps_mask*/\ |
|
"sub %%ecx , "range" \n\t" /*RangeLPS - range*/\ |
|
"and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\ |
|
"add %%ecx , "range" \n\t" /*new range*/\ |
|
"shl $17 , %%ecx \n\t"\ |
|
"and "tmp" , %%ecx \n\t"\ |
|
"sub %%ecx , "low" \n\t"\ |
|
"xor "tmp" , "ret" \n\t" |
|
#endif /* HAVE_FAST_CMOV */ |
|
|
|
#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte, byte) \ |
|
"movzbl "statep" , "ret" \n\t"\ |
|
"mov "range" , "tmp" \n\t"\ |
|
"and $0xC0 , "range" \n\t"\ |
|
"movzbl "MANGLE(ff_h264_lps_range)"("ret", "range", 2), "range" \n\t"\ |
|
"sub "range" , "tmp" \n\t"\ |
|
BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, \ |
|
range, tmp) \ |
|
"movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\ |
|
"shl %%cl , "range" \n\t"\ |
|
"movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\ |
|
"shl %%cl , "low" \n\t"\ |
|
"mov "tmpbyte" , "statep" \n\t"\ |
|
"test "lowword" , "lowword" \n\t"\ |
|
" jnz 1f \n\t"\ |
|
"mov "byte"("cabac"), %%"REG_c" \n\t"\ |
|
"add"OPSIZE" $2 , "byte "("cabac") \n\t"\ |
|
"movzwl (%%"REG_c") , "tmp" \n\t"\ |
|
"lea -1("low") , %%ecx \n\t"\ |
|
"xor "low" , %%ecx \n\t"\ |
|
"shr $15 , %%ecx \n\t"\ |
|
"bswap "tmp" \n\t"\ |
|
"shr $15 , "tmp" \n\t"\ |
|
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\ |
|
"sub $0xFFFF , "tmp" \n\t"\ |
|
"neg %%ecx \n\t"\ |
|
"add $7 , %%ecx \n\t"\ |
|
"shl %%cl , "tmp" \n\t"\ |
|
"add "tmp" , "low" \n\t"\ |
|
"1: \n\t" |
|
|
|
#if HAVE_7REGS && !defined(BROKEN_RELOCATIONS) |
|
#define get_cabac_inline get_cabac_inline_x86 |
|
static av_always_inline int get_cabac_inline_x86(CABACContext *c, |
|
uint8_t *const state) |
|
{ |
|
int bit, low, range, tmp; |
|
|
|
__asm__ volatile( |
|
"movl %a6(%5), %2 \n\t" |
|
"movl %a7(%5), %1 \n\t" |
|
BRANCHLESS_GET_CABAC("%0", "%5", "(%4)", "%1", "%w1", "%2", |
|
"%3", "%b3", "%a8") |
|
"movl %2, %a6(%5) \n\t" |
|
"movl %1, %a7(%5) \n\t" |
|
|
|
:"=&r"(bit), "=&r"(low), "=&r"(range), "=&q"(tmp) |
|
:"r"(state), "r"(c), |
|
"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)), |
|
"i"(offsetof(CABACContext, bytestream)) |
|
: "%"REG_c, "memory" |
|
); |
|
return bit & 1; |
|
} |
|
#endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */ |
|
|
|
#define get_cabac_bypass_sign get_cabac_bypass_sign_x86 |
|
static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val) |
|
{ |
|
x86_reg tmp; |
|
__asm__ volatile( |
|
"movl %a3(%2), %k1 \n\t" |
|
"movl %a4(%2), %%eax \n\t" |
|
"shl $17, %k1 \n\t" |
|
"add %%eax, %%eax \n\t" |
|
"sub %k1, %%eax \n\t" |
|
"cltd \n\t" |
|
"and %%edx, %k1 \n\t" |
|
"add %k1, %%eax \n\t" |
|
"xor %%edx, %%ecx \n\t" |
|
"sub %%edx, %%ecx \n\t" |
|
"test %%ax, %%ax \n\t" |
|
" jnz 1f \n\t" |
|
"mov %a5(%2), %1 \n\t" |
|
"subl $0xFFFF, %%eax \n\t" |
|
"movzwl (%1), %%edx \n\t" |
|
"bswap %%edx \n\t" |
|
"shrl $15, %%edx \n\t" |
|
"add $2, %1 \n\t" |
|
"addl %%edx, %%eax \n\t" |
|
"mov %1, %a5(%2) \n\t" |
|
"1: \n\t" |
|
"movl %%eax, %a4(%2) \n\t" |
|
|
|
:"+c"(val), "=&r"(tmp) |
|
:"r"(c), |
|
"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)), |
|
"i"(offsetof(CABACContext, bytestream)) |
|
: "%eax", "%edx", "memory" |
|
); |
|
return val; |
|
} |
|
|
|
#endif /* AVCODEC_X86_CABAC_H */
|
|
|