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DEFINITIONS
This source file includes following definitions.
- decode_significance_x86
- decode_significance_8x8_x86
/*
* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file libavcodec/x86/h264_i386.h
* H.264 / AVC / MPEG4 part10 codec.
* non-MMX i386-specific optimizations for H.264
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#ifndef AVCODEC_X86_H264_I386_H
#define AVCODEC_X86_H264_I386_H
#include "libavcodec/cabac.h"
//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
//as that would make optimization work hard)
#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS)
static int decode_significance_x86(CABACContext *c, int max_coeff,
uint8_t *significant_coeff_ctx_base,
int *index){
void *end= significant_coeff_ctx_base + max_coeff - 1;
int minusstart= -(int)significant_coeff_ctx_base;
int minusindex= 4-(int)index;
int coeff_count;
__asm__ volatile(
"movl "RANGE "(%3), %%esi \n\t"
"movl "LOW "(%3), %%ebx \n\t"
"2: \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
"%%bx", "%%esi", "%%eax", "%%al")
"test $1, %%edx \n\t"
" jz 3f \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx",
"%%bx", "%%esi", "%%eax", "%%al")
"mov %2, %%"REG_a" \n\t"
"movl %4, %%ecx \n\t"
"add %1, %%"REG_c" \n\t"
"movl %%ecx, (%%"REG_a") \n\t"
"test $1, %%edx \n\t"
" jnz 4f \n\t"
"add $4, %%"REG_a" \n\t"
"mov %%"REG_a", %2 \n\t"
"3: \n\t"
"add $1, %1 \n\t"
"cmp %5, %1 \n\t"
" jb 2b \n\t"
"mov %2, %%"REG_a" \n\t"
"movl %4, %%ecx \n\t"
"add %1, %%"REG_c" \n\t"
"movl %%ecx, (%%"REG_a") \n\t"
"4: \n\t"
"add %6, %%eax \n\t"
"shr $2, %%eax \n\t"
"movl %%esi, "RANGE "(%3) \n\t"
"movl %%ebx, "LOW "(%3) \n\t"
:"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex)
: "%"REG_c, "%ebx", "%edx", "%esi", "memory"
);
return coeff_count;
}
static int decode_significance_8x8_x86(CABACContext *c,
uint8_t *significant_coeff_ctx_base,
int *index, const uint8_t *sig_off){
int minusindex= 4-(int)index;
int coeff_count;
x86_reg last=0;
__asm__ volatile(
"movl "RANGE "(%3), %%esi \n\t"
"movl "LOW "(%3), %%ebx \n\t"
"mov %1, %%"REG_D" \n\t"
"2: \n\t"
"mov %6, %%"REG_a" \n\t"
"movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t"
"add %5, %%"REG_D" \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
"%%bx", "%%esi", "%%eax", "%%al")
"mov %1, %%edi \n\t"
"test $1, %%edx \n\t"
" jz 3f \n\t"
"movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
"add %5, %%"REG_D" \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx",
"%%bx", "%%esi", "%%eax", "%%al")
"mov %2, %%"REG_a" \n\t"
"mov %1, %%edi \n\t"
"movl %%edi, (%%"REG_a") \n\t"
"test $1, %%edx \n\t"
" jnz 4f \n\t"
"add $4, %%"REG_a" \n\t"
"mov %%"REG_a", %2 \n\t"
"3: \n\t"
"addl $1, %%edi \n\t"
"mov %%edi, %1 \n\t"
"cmpl $63, %%edi \n\t"
" jb 2b \n\t"
"mov %2, %%"REG_a" \n\t"
"movl %%edi, (%%"REG_a") \n\t"
"4: \n\t"
"addl %4, %%eax \n\t"
"shr $2, %%eax \n\t"
"movl %%esi, "RANGE "(%3) \n\t"
"movl %%ebx, "LOW "(%3) \n\t"
:"=&a"(coeff_count),"+m"(last), "+m"(index)
:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off)
: "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
);
return coeff_count;
}
#endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */
/* !defined(BROKEN_RELOCATIONS) */
#endif /* AVCODEC_X86_H264_I386_H */