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skip reduction with multiplication

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This commit is contained in:
Ahmet Inan 2024-03-28 16:28:04 +01:00
commit 86f1020d54
1 changed files with 9 additions and 6 deletions
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15
cauchy_prime_field_erasure_coding.hh
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@ -73,15 +73,18 @@ struct CauchyPrimeFieldErasureCoding
}
void mac(const IO *a, PF b, int len, bool first, bool last)
{
if (first) {
if (first && last) {
for (int i = 0; i < len; i++)
temp[i] = b * PF(a[i]);
} else if (first) {
for (int i = 0; i < len; i++)
temp[i] = mul(b, PF(a[i]));
} else if (last) {
for (int i = 0; i < len; i++)
temp[i] = reduce(add(temp[i], b * PF(a[i])));
temp[i] = reduce(add(temp[i], mul(b, PF(a[i]))));
} else {
for (int i = 0; i < len; i++)
temp[i] = add(temp[i], b * PF(a[i]));
temp[i] = add(temp[i], mul(b, PF(a[i])));
}
}
void mac_sub(IO *c, const IO *a, PF b, IO s, int len, bool first, bool last)
@ -92,13 +95,13 @@ struct CauchyPrimeFieldErasureCoding
c[i] = (b * PF(a[i] == s ? v : a[i]))();
} else if (first) {
for (int i = 0; i < len; i++)
temp[i] = b * PF(a[i] == s ? v : a[i]);
temp[i] = mul(b, PF(a[i] == s ? v : a[i]));
} else if (last) {
for (int i = 0; i < len; i++)
c[i] = reduce(add(temp[i], b * PF(a[i] == s ? v : a[i])))();
c[i] = reduce(add(temp[i], mul(b, PF(a[i] == s ? v : a[i]))))();
} else {
for (int i = 0; i < len; i++)
temp[i] = add(temp[i], b * PF(a[i] == s ? v : a[i]));
temp[i] = add(temp[i], mul(b, PF(a[i] == s ? v : a[i])));
}
}
int find_unused(int block_len)