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used larger type and replaced literals with constants

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This commit is contained in:
Ahmet Inan 2024-03-30 09:22:11 +01:00
commit c73cc186a2
1 changed files with 8 additions and 5 deletions
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13
cauchy_prime_field_erasure_coding.hh
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@ -13,7 +13,10 @@ struct CauchyPrimeFieldErasureCoding
{
static_assert(MAX_LEN < int(PF::P-1), "Block length must be smaller than largest field value");
PF temp[MAX_LEN];
uint8_t used[(PF::P+7)/8];
typedef unsigned used_word;
static constexpr int used_width = 8 * sizeof(used_word);
static constexpr int used_length = (PF::P + used_width - 1) / used_width;
used_word used_values[used_length];
PF row_num, row_den;
// $a_{ij} = \frac{1}{x_i + y_j}$
PF cauchy_matrix(int i, int j)
@ -106,12 +109,12 @@ struct CauchyPrimeFieldErasureCoding
}
int find_unused(int block_len)
{
for (int i = 0; i < int(PF::P+7)/8; ++i)
used[i] = 0;
for (int i = 0; i < used_length; ++i)
used_values[i] = 0;
for (int i = 0; i < block_len; ++i)
used[temp[i]()/8] |= 1 << temp[i]()%8;
used_values[temp[i]()/used_width] |= 1 << temp[i]()%used_width;
int s = 0;
while (used[s/8] & 1 << s%8)
while (used_values[s/used_width] & 1 << s%used_width)
++s;
return s;
}