copysignf
float copysignf(float, float);
PROTO_NORMAL(copysignf);
DEF_STD(copysignf);
__imag__ res = copysignf(0.0, __imag__ z);
if (k > 0xfe) return huge*copysignf(huge,x); /* overflow */
return huge*copysignf(huge,x); /*overflow*/
else return tiny*copysignf(tiny,x); /*underflow*/
out = copysignf(