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reduce the number of DoubleCRT constants in unpack function #231

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reduce the number of DoubleCRT constants in unpack function #231

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26 changes: 22 additions & 4 deletions src/intraSlot.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -69,10 +69,27 @@ class unpack_pa_impl {
static void apply(const EncryptedArrayDerived<type>& ea, const CtPtrs& unpacked,
const Ctxt&ctxt,const std::vector<zzX>& unpackSlotEncoding)
{
long d = ea.getDegree(); // size of each slot

//ctxt.cleanUp();

const long d = ea.getDegree(); // size of each slot
const long t = ea.getPAlgebra().getP();
const long m = ea.getPAlgebra().getM();
DoubleCRT coeff(unpackSlotEncoding.front(), ctxt.getContext(), ctxt.getPrimeSet());
Ctxt tmp1(ZeroCtxtLike, ctxt);
for (long i = 0; i < unpacked.size(); i++) {
/// accumulative frobenius: frobenius(v, 2) = frobenius(frobenius(v, 1), 1)
if (i > 0)
coeff.automorph(t % m);
*(unpacked[i]) = ctxt;
unpacked[i]->multByConstant(coeff);
Ctxt origin(*unpacked[i]);
/// TODO use hoisting here
for (long j = 1; j < d; j++) {
tmp1 = origin;
tmp1.frobeniusAutomorph(j);
tmp1.cleanUp();
*(unpacked[i]) += tmp1;
}
}
#if 0
// Convert the unpack constants to doubleCRT
std::vector< std::shared_ptr<DoubleCRT> > coeff_vector(d);
for (long i = 0; i < d; i++) {
Expand Down Expand Up @@ -102,6 +119,7 @@ class unpack_pa_impl {
*(unpacked[i]) += tmp1;
}
} // NOTE: why aren't we using multi-threading here?
#endif
}
};
//! \endcond
Expand Down