expf
extern float expf(float x);
float exp_val = expf (__real__ x);
exp_x = expf(x - kln2);
h = expf(fabsf(x)) * 0.5f;
return CMPLXF(expf(x), y);
exp_x = expf(x);
h = expf(fabsf(x)) * 0.5f;
float exp_mx = expf(-fabsf(x));
return expf(x - kln2) * scale * scale;
t = expf(x);
return expf(-z*z - 0.5625f) * expf((z-x)*(z+x) + R/S)/x;