__vc_exp
extern void __vc_exp(int, float *, int, float *, int, float *);
__vc_exp(n, tmp, 1, z, stridez, tmp + n + n);
extern void __vc_exp(int, float *, int, float *, int, float *);
__vc_exp(*n, x, *stridex, y, *stridey, tmp);