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s16 swiAtan(s16 x,s16 y){  s16 __value;   s16 __arg1 = (x);   s16 __arg2 = (y);   __asm volatile (" mov r0,%1  \n mov r1,%2  \n swi #0xa0 \n mov %0,r0" : "=r" (__value) : "r" (__arg1), "r" (__arg2) : "r0", "r1");  return (__value/180);}