DivMod_test.cc

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#include "catch.hpp"
#include "DivModByConst.hh"
#include "DivModBySame.hh"
 
using namespace openmsx;
 
template<uint32_t DIVISOR>
static void test(const DivModByConst<DIVISOR>& c, const DivModBySame& s,
                 uint64_t dividend)
{
        uint64_t rd = dividend / DIVISOR;
        if (uint32_t(rd) == rd) {
                CHECK(c.div(dividend) == (dividend / DIVISOR));
                CHECK(s.div(dividend) == (dividend / DIVISOR));
                CHECK(c.mod(dividend) == (dividend % DIVISOR));
                CHECK(s.mod(dividend) == (dividend % DIVISOR));
        }
}
 
template<uint32_t DIVISOR>
static void test()
{
        DivModByConst<DIVISOR> c;
        DivModBySame s; s.setDivisor(DIVISOR);
 
        for (uint64_t dividend : {0ULL, 1ULL, 2ULL, 3ULL, 4ULL, 5ULL, 7ULL,
                                  100ULL, 10015ULL, 12410015ULL, 0x1234567890ULL,
                                  0x7FFFFFFFFFFFFFFFULL, 0x8000000000000000ULL,
                                  0xFFFFFFFF00000000ULL, 0xFFFFFFFFFFFFFFFFULL}) {
                test(c, s, dividend);
        }
}
 
TEST_CASE("DivModByConst, DivModBySame")
{
        test<1>();
        test<2>();
        test<3>();
        test<4>();
        test<5>();
        test<7>();
        test<10>();
        test<128>();
        test<1000>();
        test<90000>();
        test<90017>();
}