x86_cpu.h

ffmpeg的完整源代码和作者自己写的文档。不但有在Linux的工程哦

/*
 * copyright (c) 2006 Michael Niedermayer <[e-mail]>
 *
 * 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
 */

#ifndef AVUTIL_X86CPU_H
#define AVUTIL_X86CPU_H

#ifdef ARCH_X86_64
#  define REG_a "rax"
#  define REG_b "rbx"
#  define REG_c "rcx"
#  define REG_d "rdx"
#  define REG_D "rdi"
#  define REG_S "rsi"
#  define PTR_SIZE "8"

#  define REG_SP "rsp"
#  define REG_BP "rbp"
#  define REGBP   rbp
#  define REGa    rax
#  define REGb    rbx
#  define REGc    rcx
#  define REGSP   rsp

#else

#  define REG_a "eax"
#  define REG_b "ebx"
#  define REG_c "ecx"
#  define REG_d "edx"
#  define REG_D "edi"
#  define REG_S "esi"
#  define PTR_SIZE "4"

#  define REG_SP "esp"
#  define REG_BP "ebp"
#  define REGBP   ebp
#  define REGa    eax
#  define REGb    ebx
#  define REGc    ecx
#  define REGSP   esp
#endif

#if defined(ARCH_X86_64) || (defined(ARCH_X86_32) && defined(HAVE_EBX_AVAILABLE) && defined(HAVE_EBP_AVAILABLE))
#  define HAVE_7REGS 1
#endif

#if defined(ARCH_X86_64) && defined(PIC)
#  define BROKEN_RELOCATIONS 1
#endif

#endif /* AVUTIL_X86CPU_H */