191 lines
5.9 KiB
C
191 lines
5.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2015 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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/* Don't change those to use shift as shift may call to compile rt
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functions and we're not testing them now.
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*/
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static int
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leading_bit64 (grub_uint64_t a)
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{
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return !!(a & 0x8000000000000000LL);
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}
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static int
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leading_bit32 (grub_uint32_t a)
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{
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return !!(a & 0x80000000);
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}
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/* Computes (a < b) without involving comparison operator. */
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static int
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is_less32 (grub_uint32_t a, grub_uint32_t b)
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{
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if (leading_bit32(a) && !leading_bit32(b))
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return 0;
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if (!leading_bit32(a) && leading_bit32(b))
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return 1;
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return leading_bit32(a - b);
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}
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static void
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test32 (grub_uint32_t a, grub_uint32_t b)
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{
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grub_test_assert ((a < b) == is_less32(a, b), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((a > b) == is_less32(b, a), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((b < a) == is_less32(b, a), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((b > a) == is_less32(a, b), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert (!(is_less32(a, b) && is_less32(b, a)), "comparison inconsistent: %lld, %lld",
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(long long) a, (long long) b);
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}
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/* Computes (a > b) without involving comparison operator. */
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static int
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is_less32s (grub_int32_t a, grub_int32_t b)
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{
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if (leading_bit32(a) && !leading_bit32(b))
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return 1; /* a < 0 && b >= 0. */
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if (!leading_bit32(a) && leading_bit32(b))
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return 0; /* b < 0 && a >= 0. */
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return leading_bit32(a - b);
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}
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static void
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test32s (grub_int32_t a, grub_int32_t b)
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{
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grub_test_assert ((a < b) == is_less32s(a, b), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((a > b) == is_less32s(b, a), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((b < a) == is_less32s(b, a), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((b > a) == is_less32s(a, b), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert (!(is_less32s(a, b) && is_less32s(b, a)), "comparison inconsistent: %lld, %lld",
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(long long) a, (long long) b);
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}
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/* Computes (a > b) without involving comparison operator. */
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static int
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is_less64 (grub_uint64_t a, grub_uint64_t b)
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{
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if (leading_bit64(a) && !leading_bit64(b))
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return 0;
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if (!leading_bit64(a) && leading_bit64(b))
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return 1;
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return leading_bit64(a - b);
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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_test_assert ((a < b) == is_less64(a, b), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((a > b) == is_less64(b, a), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((b < a) == is_less64(b, a), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((b > a) == is_less64(a, b), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert (!(is_less64(a, b) && is_less64(b, a)), "comparison inconsistent: %lld, %lld",
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(long long) a, (long long) b);
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}
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/* Computes (a > b) without involving comparison operator. */
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static int
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is_less64s (grub_int64_t a, grub_int64_t b)
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{
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if (leading_bit64(a) && !leading_bit64(b))
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return 1; /* a < 0 && b >= 0. */
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if (!leading_bit64(a) && leading_bit64(b))
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return 0; /* b < 0 && a >= 0. */
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return leading_bit64(a - b);
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}
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static void
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test64s (grub_int64_t a, grub_int64_t b)
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{
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grub_test_assert ((a < b) == is_less64s(a, b), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((a > b) == is_less64s(b, a), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((b < a) == is_less64s(b, a), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert ((b > a) == is_less64s(a, b), "comparison result mismatch: %lld, %lld",
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(long long) a, (long long) b);
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grub_test_assert (!(is_less64s(a, b) && is_less64s(b, a)), "comparison inconsistent: %lld, %lld",
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(long long) a, (long long) b);
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}
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static void
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test_all(grub_uint64_t a, grub_uint64_t b)
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{
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test64 (a, b);
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test32 (a, b);
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test64s (a, b);
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test32s (a, b);
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test64s (a, -b);
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test32s (a, -b);
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test64s (-a, b);
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test32s (-a, b);
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test64s (-a, -b);
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test32s (-a, -b);
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}
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static void
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cmp_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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test_all (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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test_all (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 (cmp_test, cmp_test);
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