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fix(compiler/runtime): decode with integers

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This commit is contained in:
Quentin Bourgerie
2021-09-23 11:19:40 +02:00
parent 3feab09c88
commit d9be22c1b1
1 changed files with 4 additions and 5 deletions
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9
compiler/lib/Support/KeySet.cpp
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@@ -267,11 +267,10 @@ llvm::Error KeySet::decrypt_lwe(size_t argPos, LweCiphertext_u64 *ciphertext,
decrypt_lwe_u64(&err, std::get<2>(outputSk), ciphertext, &plaintext),
"cannot decrypt");
// Decode
double divisor = std::pow(
2, 64 - (std::get<0>(outputSk).encryption->encoding.precision + 1));
output = std::round(((double)plaintext._0) / divisor);
output %= (1 << (std::get<0>(outputSk).encryption->encoding.precision + 1));
size_t precision = std::get<0>(outputSk).encryption->encoding.precision;
output = plaintext._0 >> (64 - precision - 2);
size_t carry = output % 2;
output = ((output >> 1) + carry) % (1 << (precision + 1));
return llvm::Error::success();
}