297      * Underflow. 2^-1074 is 00000000.00000001; so if ex == -1074  in test_ldexp()
301      * an underflow condition.  in test_ldexp()
303      * So, ex < -1074 is definite underflow, and ex == -1074 is  in test_ldexp()
304      * underflow iff all mantissa bits are zero.  in test_ldexp()
307         out[0] = sign;                 /* underflow: correctly signed zero */  in test_ldexp()
309         return "underflow";  in test_ldexp()
313      * No overflow or underflow; should be nice and simple, unless  in test_ldexp()
336         /* Proper ERANGE underflow was handled earlier, but we still  in test_ldexp()
337          * expect an IEEE Underflow exception if this partially  in test_ldexp()
341         return NULL;                   /* underflow was handled earlier */  in test_ldexp()
372      * Underflow. 2^-149 is 00000001; so if ex == -149 then we have  in test_ldexpf()
375      * bottom endpoint which rounds to even and is an underflow  in test_ldexpf()
378      * So, ex < -149 is definite underflow, and ex == -149 is  in test_ldexpf()
379      * underflow iff all mantissa bits are zero.  in test_ldexpf()
382         *out = sign;                 /* underflow: correctly signed zero */  in test_ldexpf()
383         return "underflow";  in test_ldexpf()
387      * No overflow or underflow; should be nice and simple, unless  in test_ldexpf()
407         /* Proper ERANGE underflow was handled earlier, but we still  in test_ldexpf()
408          * expect an IEEE Underflow exception if this partially  in test_ldexpf()
412         return NULL;                   /* underflow was handled earlier */  in test_ldexpf()