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#ifdef __aarch64__
# define STATIC_CHAIN_REG "x18"
#elif defined(__alpha__)
# define STATIC_CHAIN_REG "$1"
#elif defined(__arm__)
# define STATIC_CHAIN_REG "ip"
#elif defined(__sparc__)
# if defined(__arch64__) || defined(__sparcv9)
# define STATIC_CHAIN_REG "g5"
# else
# define STATIC_CHAIN_REG "g2"
# endif
#elif defined(__x86_64__)
# define STATIC_CHAIN_REG "r10"
#elif defined(__i386__)
# ifndef ABI_NUM
# define STATIC_CHAIN_REG "ecx" /* FFI_DEFAULT_ABI only */
# endif
#endif
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