Assert fail in Bdc_ManAlloc function about cingulata

[renaud-sirdey]

Dear Nan,

Thanks a lot for your feedback.

Indeed, the second version of the code above is the correct one.

This is so because encrypted-domain variables have to be read from the standard input in your Cingulata programs.

In the first version of your code, the matrix values are constant clear domain values and treated as such through the Integer8 type (which in such a case performs compile-time mixed clear domain/encrypted domain calculation simplifications in order to rightfully save non necessary FHE calculations).

This will result in an circuit with a constant output which does as such never need to be run in the encrypted domain (although the resulting core dump in ABC is far from graceful and should be fixed to get a more meaningful warning or error).

So in summary, if you do something like this :

Integer8 a=5,b=3;
cout<<a+b; 

All is created is a circuit which always output 8 and does never require any encrypted-domain calculations, whereas if you do something like,

Integer8 a,b;
cin>>a;
cin>>b;
cout<<a+b;

Then, you create a program which takes two encrypted values and output their (encrypted) sum.

As a further subtetly, a and/or b may be still be clear-domain variables but since they are read from the standard input their values will not induce any simplification or constant progagation in the resulting circuit (the “cardio” test case gives an example of handling mixed clear/crypto domain variables in Cingulata programs) – avoidable homomorphic operations will then be simplified as runtime.

Hope this helps clarifying,
Best regards, Renaud

[NanXiao]

Hi Renaud,

Got it! Thanks very much for your time and help!

Best Regards
Nan Xiao