Does this implementation have the sign activation implemented?

[Jay]

[WeiBenqiang]

tfhe_bootstrap_FFT(bootstrapped + j, bs_key, mu_boot, multi_sum + j); I think this function implements sign activation and bootstrapping at the same time.

/**
 * result = LWE(mu) iff phase(x)>0, LWE(-mu) iff phase(x)<0
 * @param result The resulting LweSample
 * @param bk The bootstrapping + keyswitch key
 * @param mu The output message (if phase(x)>0)
 * @param x The input sample
 */
EXPORT void tfhe_bootstrap_FFT(LweSample *result,
                               const LweBootstrappingKeyFFT *bk,
                               Torus32 mu,
                               const LweSample *x)