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8 changes: 5 additions & 3 deletions shell_encryption/rns/rns_polynomial_hwy.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -112,9 +112,11 @@ void BatchFusedMulAddMontgomeryRepHwy(absl::Span<const ModularInt64> a,

// Generate the masks on the even lanes, which correspond to the lower 64 bits
// of BigInt64 (unsigned 128-bit int) values in the output vector.
uint8_t* mask_lo_bits = new uint8_t[(N + 7) / 8];
for (int j = 0; j < (N + 7) / 8; ++j) {
mask_lo_bits[j] = 0;
// LoadMaskBits requires at least 8 readable bytes, even if N is small.
int num_bytes = (N + 7) / 8;
int alloc_bytes = num_bytes < 8 ? 8 : num_bytes;
uint8_t* mask_lo_bits = new uint8_t[alloc_bytes]();
for (int j = 0; j < num_bytes; ++j) {
for (int k = 0; k < 8; k += 2) {
mask_lo_bits[j] |= static_cast<uint8_t>(1 << k);
}
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