Source/bmalloc/libpas/src/test/ExtendedGCDTests.cpp

/*
 * Copyright (c) 2018 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#include "TestHarness.h"
#include "pas_extended_gcd.h"

using namespace std;

namespace {

void testExtendedGCD(int64_t left, int64_t right,
                     int64_t result, int64_t leftBezoutCoefficient, int64_t rightBezoutCoefficient)
{
    pas_extended_gcd_result actualResult = pas_extended_gcd(left, right);
    CHECK_EQUAL(actualResult.result, result);
    CHECK_EQUAL(actualResult.left_bezout_coefficient, leftBezoutCoefficient);
    CHECK_EQUAL(actualResult.right_bezout_coefficient, rightBezoutCoefficient);
    
    actualResult = pas_extended_gcd(right, left);
    CHECK_EQUAL(actualResult.result, result);
    CHECK_EQUAL(actualResult.left_bezout_coefficient, rightBezoutCoefficient);
    CHECK_EQUAL(actualResult.right_bezout_coefficient, leftBezoutCoefficient);
}

} // anonymous namespace

void addExtendedGCDTests()
{
    ADD_TEST(testExtendedGCD(1, 0, 1, 1, 0));
    ADD_TEST(testExtendedGCD(2, 0, 2, 1, 0));
    ADD_TEST(testExtendedGCD(1, 64, 1, 1, 0));
    ADD_TEST(testExtendedGCD(666, 42, 6, -1, 16));
    ADD_TEST(testExtendedGCD(666, 1024, 2, -123, 80));
    ADD_TEST(testExtendedGCD(65536, 32768, 32768, 0, 1));
}