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fixed coefficients encoding

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This commit is contained in:
Jean-Philippe Bossuat
2025-03-05 16:11:32 +01:00
parent 483a142ab0
commit e149aa584a
1 changed files with 6 additions and 17 deletions
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23
base2k/src/encoding.rs
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@@ -137,22 +137,18 @@ fn encode_vec_i64<T: VecZnxCommon>(
let size: usize = min(data.len(), a.n());
let log_k_rem: usize = log_base2k - (log_k % log_base2k);
(0..a.cols()).for_each(|i| unsafe {
znx_zero_i64_ref(size as u64, a.at_mut(i).as_mut_ptr());
});
// If 2^{log_base2k} * 2^{k_rem} < 2^{63}-1, then we can simply copy
// values on the last limb.
// Else we decompose values base2k.
if log_max + log_k_rem < 63 || log_k_rem == log_base2k {
(0..a.cols()).for_each(|i| unsafe {
znx_zero_i64_ref(size as u64, a.at_mut(i).as_mut_ptr());
});
a.at_mut(cols - 1)[..size].copy_from_slice(&data[..size]);
} else {
let mask: i64 = (1 << log_base2k) - 1;
let steps: usize = min(cols, (log_max + log_base2k - 1) / log_base2k);
(0..steps).for_each(|i| unsafe {
znx_zero_i64_ref(size as u64, a.at_mut(i).as_mut_ptr());
});
(cols - steps..cols)
.rev()
.enumerate()
@@ -165,7 +161,6 @@ fn encode_vec_i64<T: VecZnxCommon>(
// Case where self.prec % self.k != 0.
if log_k_rem != log_base2k {
let cols = a.cols();
let steps: usize = min(cols, (log_max + log_base2k - 1) / log_base2k);
(cols - steps..cols).rev().for_each(|i| {
a.at_mut(i)[..size]
@@ -246,21 +241,16 @@ fn encode_coeff_i64<T: VecZnxCommon>(
a.cols()
);
let log_k_rem: usize = log_base2k - (log_k % log_base2k);
let cols = a.cols();
(0..a.cols()).for_each(|j| a.at_mut(j)[i] = 0);
// If 2^{log_base2k} * 2^{log_k_rem} < 2^{63}-1, then we can simply copy
// values on the last limb.
// Else we decompose values base2k.
if log_max + log_k_rem < 63 || log_k_rem == log_base2k {
(0..cols - 1).for_each(|j| a.at_mut(j)[i] = 0);
a.at_mut(a.cols() - 1)[i] = value;
a.at_mut(cols-1)[i] = value;
} else {
let mask: i64 = (1 << log_base2k) - 1;
let steps: usize = min(cols, (log_max + log_base2k - 1) / log_base2k);
(0..cols - steps).for_each(|j| a.at_mut(j)[i] = 0);
(cols - steps..cols)
.rev()
.enumerate()
@@ -271,7 +261,6 @@ fn encode_coeff_i64<T: VecZnxCommon>(
// Case where prec % k != 0.
if log_k_rem != log_base2k {
let cols = a.cols();
let steps: usize = min(cols, (log_max + log_base2k - 1) / log_base2k);
(cols - steps..cols).rev().for_each(|j| {
a.at_mut(j)[i] <<= log_k_rem;