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Fix right shifting of negative values in cpp_int.

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To give the same values as 2's complement representations,
though not the same bit-pattern.
Updated tests.
Fixed assignment from float to not rely on shifting negative values.
This commit is contained in:
jzmaddock
2015-05-30 11:39:39 +01:00
parent 3b41c0af07
commit f89bac311b
3 changed files with 49 additions and 2 deletions
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8
test/test_cpp_int.cpp
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@@ -172,14 +172,22 @@ struct tester
if(!std::numeric_limits<test_type>::is_bounded)
{
BOOST_CHECK_EQUAL(mpz_int(a << i).str(), test_type(a1 << i).str());
BOOST_CHECK_EQUAL(mpz_int(-a << i).str(), test_type(-a1 << i).str());
}
else if(!is_checked_cpp_int<test_type>::value)
{
test_type t1(mpz_int(a << i).str());
test_type t2 = a1 << i;
BOOST_CHECK_EQUAL(t1, t2);
t1 = test_type(mpz_int(-a << i).str());
t2 = -a1 << i;
BOOST_CHECK_EQUAL(t1, t2);
}
BOOST_CHECK_EQUAL(mpz_int(a >> i).str(), test_type(a1 >> i).str());
if(!is_checked_cpp_int<test_type>::value)
{
BOOST_CHECK_EQUAL(mpz_int(-a >> i).str(), test_type(-a1 >> i).str());
}
}
// gcd/lcm
BOOST_CHECK_EQUAL(mpz_int(gcd(a, b)).str(), test_type(gcd(a1, b1)).str());