expm1f
float expm1f(float);
t = expm1f(fabsf(x));
t = expm1f(fabsf(x));
t = expm1f(two*fabsf(x));
t = expm1f(-two*fabsf(x));
if (isnan(expm1f(x)) == 0)
if (expm1f(x) != -1.0)
float y = expm1f(x);
float y = expm1f(x);
float y = expm1f(x);