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a*p % m may overflow, do not perform naive multiplication in unit tests or undefined behavior may result. [CI SKIP]

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This commit is contained in:
Nick Thompson
2018-10-26 11:19:43 -06:00
parent 3f1603938c
commit 2d463f3ee7
4 changed files with 35 additions and 34 deletions
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11
include/boost/integer/extended_euclidean.hpp
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@ -6,12 +6,9 @@
*/
#ifndef BOOST_INTEGER_EXTENDED_EUCLIDEAN_HPP
#define BOOST_INTEGER_EXTENDED_EUCLIDEAN_HPP
#include <tuple>
#include <limits>
#include <stdexcept>
#include <boost/throw_exception.hpp>
#include <boost/assert.hpp>
#include <iostream>
namespace boost { namespace integer {
@ -71,14 +68,8 @@ euclidean_result_t<Z> extended_euclidean(Z m, Z n)
if (swapped)
{
std::swap(u1, u2);
BOOST_ASSERT(u2*m+u1*n==u0);
return {u0, u2, u2};
}
else
{
BOOST_ASSERT(u1*m+u2*n==u0);
}
return {u0, u1, u2};
}