*__builtin_memcpy copy memory region
*__builtin_memset set memory region to give value
*__builtin_memcmp compare memory region
*__builtin_strcmp
*__builtin_sqrt,__builtin_sqrtf,__builtin_sqrtl
*__builtin_sin,__builtin_sinf,__builtin_sinl
*__builtin_cos,__builtin_cosf,__builtin_cosl
*__builtin_div,__builtin_ldiv integer division with rest
