tests/test_szmul.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2023 Mike Becker, Olaf Wintermann All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#include "cx/test.h"
#include "cx/common.h"

#include <stdint.h>

CX_TEST(test_szmul) {
    size_t r;
    int e;

    CX_TEST_DO {
        e = cx_szmul(5, 7, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 35);

        size_t s = SIZE_MAX & ~3;

        e = cx_szmul(s / 4, 2, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s / 2);

        e = cx_szmul(2, s / 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s / 2);

        e = cx_szmul(s / 4, 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s);

        e = cx_szmul(4, s / 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s);

        e = cx_szmul(s / 4, 5, &r);
        CX_TEST_ASSERT(e != 0);

        e = cx_szmul(5, s / 4, &r);
        CX_TEST_ASSERT(e != 0);

        e = cx_szmul(SIZE_MAX - 4, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul(0, SIZE_MAX - 1, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul(SIZE_MAX, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul(0, SIZE_MAX, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul(0, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);
    }
}

#ifdef CX_SZMUL_BUILTIN

// also test the custom implementation
#undef CX_SZMUL_BUILTIN

#include "../src/szmul.c"

#define CX_SZMUL_BUILTIN

CX_TEST(test_szmul_impl) {
    size_t r;
    int e;

    CX_TEST_DO {
        e = cx_szmul_impl(5, 7, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 35);

        size_t s = SIZE_MAX & ~3;

        e = cx_szmul_impl(s / 4, 2, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s / 2);

        e = cx_szmul_impl(2, s / 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s / 2);

        e = cx_szmul_impl(s / 4, 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s);

        e = cx_szmul_impl(4, s / 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s);

        e = cx_szmul_impl(s / 4, 5, &r);
        CX_TEST_ASSERT(e != 0);

        e = cx_szmul_impl(5, s / 4, &r);
        CX_TEST_ASSERT(e != 0);

        e = cx_szmul_impl(SIZE_MAX - 4, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul_impl(0, SIZE_MAX - 1, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul_impl(SIZE_MAX, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul_impl(0, SIZE_MAX, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul_impl(0, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);
    }
}

#endif // CX_SZMUL_BUILTIN


CxTestSuite *cx_test_suite_szmul(void) {
    CxTestSuite *suite = cx_test_suite_new("szmul");

    cx_test_register(suite, test_szmul);
#ifdef CX_SZMUL_BUILTIN
    cx_test_register(suite, test_szmul_impl);
#endif

    return suite;
}