1283   static volatile double tiny = 1.0e-300;  in atan2()  local
1314         return pi + tiny; /* atan(+0,-anything) = pi */  in atan2()
1316         return -pi - tiny; /* atan(-0,-anything) =-pi */  in atan2()
1320   if ((ix | lx) == 0) return (hy < 0) ? -pi_o_2 - tiny : pi_o_2 + tiny;  in atan2()
1327           return pi_o_4 + tiny; /* atan(+INF,+INF) */  in atan2()
1329           return -pi_o_4 - tiny; /* atan(-INF,+INF) */  in atan2()
1331           return 3.0 * pi_o_4 + tiny; /*atan(+INF,-INF)*/  in atan2()
1333           return -3.0 * pi_o_4 - tiny; /*atan(-INF,-INF)*/  in atan2()
1342           return pi + tiny; /* atan(+...,-INF) */  in atan2()
1344           return -pi - tiny; /* atan(-...,-INF) */  in atan2()
1349   if (iy == 0x7ff00000) return (hy < 0) ? -pi_o_2 - tiny : pi_o_2 + tiny;  in atan2()
2255       tiny = 1.0e-300,  in expm1()  local
2292       if (x + tiny < 0.0)  /* raise inexact */  in expm1()
2293         return tiny - one; /* return -1 */  in expm1()
2709   static const volatile double tiny = 1.0e-300;  in tanh()  local
2739     z = one - tiny; /* raise inexact flag */  in tanh()