74 lines
2 KiB
C
74 lines
2 KiB
C
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/test.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static grub_uint64_t vectors[][2] = {
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{ 0xffffffffffffffffULL, 1},
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{ 1, 0xffffffffffffffffULL},
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{ 0xffffffffffffffffULL, 0xffffffffffffffffULL},
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{ 1, 1 },
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{ 2, 1 }
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};
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static void
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test64(grub_uint64_t a, grub_uint64_t b)
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{
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grub_uint64_t r1 = a * b, r2 = 0, r3;
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int i;
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for (i = 0; i < 64; i++)
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if ((a & (1LL << i)))
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r2 += b << i;
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r3 = ((grub_int64_t) a) * ((grub_int64_t) b);
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grub_test_assert (r1 == r2,
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"multiplication mismatch (u): 0x%llx x 0x%llx = 0x%llx != 0x%llx",
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(long long) a, (long long) b, (long long) r2, (long long) r1);
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grub_test_assert (r3 == r2,
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"multiplication mismatch (s): 0x%llx x 0x%llx = 0x%llx != 0x%llx",
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(long long) a, (long long) b, (long long) r2, (long long) r3);
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}
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static void
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mul_test (void)
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{
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grub_uint64_t a = 404, b = 7;
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grub_size_t i;
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for (i = 0; i < ARRAY_SIZE (vectors); i++)
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{
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test64 (vectors[i][0], vectors[i][1]);
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}
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for (i = 0; i < 40000; i++)
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{
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a = 17 * a + 13 * b;
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b = 23 * a + 29 * b;
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if (b == 0)
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b = 1;
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if (a == 0)
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a = 1;
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test64 (a, b);
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}
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}
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/* Register example_test method as a functional test. */
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GRUB_FUNCTIONAL_TEST (mul_test, mul_test);
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