ffmpeg/libavutil/x86_cpu.h

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#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 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 REGSP esp
#endif
#endif /* AVUTIL_X86CPU_H */