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Handle edge case

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Subtracting from `n` doesn't work in literally every case: it fails for
`0` input.
This commit is contained in:
Chip Hogg
2024-11-15 12:58:22 -05:00
parent d963ce8f93
commit 82040c1788
1 changed files with 1 additions and 1 deletions
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src/core/include/mp-units/ext/prime.h
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@@ -100,7 +100,7 @@ namespace mp_units::detail {
return add_mod( return add_mod(
// Transform into "negative space" to make the first parameter as small as possible; // Transform into "negative space" to make the first parameter as small as possible;
// then, transform back. // then, transform back.
n - mul_mod(n % a, num_batches, n), (n - mul_mod(n % a, num_batches, n)) % n,
// Handle the leftover product (which is guaranteed to fit in the integer type). // Handle the leftover product (which is guaranteed to fit in the integer type).
(a * (b % batch_size)) % n, (a * (b % batch_size)) % n,