198 lines
7.5 KiB
C
198 lines
7.5 KiB
C
/*
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* Test 128-bit division functions
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*
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* Copyright (c) 2021 Instituto de Pesquisas Eldorado (eldorado.org.br)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu/host-utils.h"
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typedef struct {
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uint64_t high;
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uint64_t low;
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uint64_t rhigh;
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uint64_t rlow;
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uint64_t divisor;
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uint64_t remainder;
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} test_data_unsigned;
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typedef struct {
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int64_t high;
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uint64_t low;
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int64_t rhigh;
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uint64_t rlow;
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int64_t divisor;
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int64_t remainder;
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} test_data_signed;
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static const test_data_unsigned test_table_unsigned[] = {
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/* Dividend fits in 64 bits */
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{ 0x0000000000000000ULL, 0x0000000000000000ULL,
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0x0000000000000000ULL, 0x0000000000000000ULL,
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0x0000000000000001ULL, 0x0000000000000000ULL},
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{ 0x0000000000000000ULL, 0x0000000000000001ULL,
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0x0000000000000000ULL, 0x0000000000000001ULL,
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0x0000000000000001ULL, 0x0000000000000000ULL},
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{ 0x0000000000000000ULL, 0x0000000000000003ULL,
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0x0000000000000000ULL, 0x0000000000000001ULL,
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0x0000000000000002ULL, 0x0000000000000001ULL},
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{ 0x0000000000000000ULL, 0x8000000000000000ULL,
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0x0000000000000000ULL, 0x8000000000000000ULL,
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0x0000000000000001ULL, 0x0000000000000000ULL},
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{ 0x0000000000000000ULL, 0xa000000000000000ULL,
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0x0000000000000000ULL, 0x0000000000000002ULL,
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0x4000000000000000ULL, 0x2000000000000000ULL},
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{ 0x0000000000000000ULL, 0x8000000000000000ULL,
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0x0000000000000000ULL, 0x0000000000000001ULL,
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0x8000000000000000ULL, 0x0000000000000000ULL},
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/* Dividend > 64 bits, with MSB 0 */
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{ 0x123456789abcdefeULL, 0xefedcba987654321ULL,
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0x123456789abcdefeULL, 0xefedcba987654321ULL,
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0x0000000000000001ULL, 0x0000000000000000ULL},
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{ 0x123456789abcdefeULL, 0xefedcba987654321ULL,
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0x0000000000000001ULL, 0x000000000000000dULL,
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0x123456789abcdefeULL, 0x03456789abcdf03bULL},
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{ 0x123456789abcdefeULL, 0xefedcba987654321ULL,
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0x0123456789abcdefULL, 0xeefedcba98765432ULL,
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0x0000000000000010ULL, 0x0000000000000001ULL},
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/* Dividend > 64 bits, with MSB 1 */
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{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
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0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
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0x0000000000000001ULL, 0x0000000000000000ULL},
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{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
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0x0000000000000001ULL, 0x0000000000000000ULL,
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0xfeeddccbbaa99887ULL, 0x766554433221100fULL},
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{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
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0x0feeddccbbaa9988ULL, 0x7766554433221100ULL,
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0x0000000000000010ULL, 0x000000000000000fULL},
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{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
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0x000000000000000eULL, 0x00f0f0f0f0f0f35aULL,
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0x123456789abcdefeULL, 0x0f8922bc55ef90c3ULL},
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/**
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* Divisor == 64 bits, with MSB 1
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* and high 64 bits of dividend >= divisor
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* (for testing normalization)
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*/
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{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
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0x0000000000000001ULL, 0x0000000000000000ULL,
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0xfeeddccbbaa99887ULL, 0x766554433221100fULL},
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{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
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0x0000000000000001ULL, 0xfddbb9977553310aULL,
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0x8000000000000001ULL, 0x78899aabbccddf05ULL},
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/* Dividend > 64 bits, divisor almost as big */
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{ 0x0000000000000001ULL, 0x23456789abcdef01ULL,
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0x0000000000000000ULL, 0x000000000000000fULL,
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0x123456789abcdefeULL, 0x123456789abcde1fULL},
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};
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static const test_data_signed test_table_signed[] = {
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/* Positive dividend, positive/negative divisors */
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{ 0x0000000000000000LL, 0x0000000000bc614eULL,
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0x0000000000000000LL, 0x0000000000bc614eULL,
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0x0000000000000001LL, 0x0000000000000000LL},
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{ 0x0000000000000000LL, 0x0000000000bc614eULL,
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0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0xffffffffffffffffLL, 0x0000000000000000LL},
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{ 0x0000000000000000LL, 0x0000000000bc614eULL,
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0x0000000000000000LL, 0x00000000005e30a7ULL,
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0x0000000000000002LL, 0x0000000000000000LL},
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{ 0x0000000000000000LL, 0x0000000000bc614eULL,
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0xffffffffffffffffLL, 0xffffffffffa1cf59ULL,
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0xfffffffffffffffeLL, 0x0000000000000000LL},
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{ 0x0000000000000000LL, 0x0000000000bc614eULL,
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0x0000000000000000LL, 0x0000000000178c29ULL,
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0x0000000000000008LL, 0x0000000000000006LL},
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{ 0x0000000000000000LL, 0x0000000000bc614eULL,
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0xffffffffffffffffLL, 0xffffffffffe873d7ULL,
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0xfffffffffffffff8LL, 0x0000000000000006LL},
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{ 0x0000000000000000LL, 0x0000000000bc614eULL,
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0x0000000000000000LL, 0x000000000000550dULL,
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0x0000000000000237LL, 0x0000000000000183LL},
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{ 0x0000000000000000LL, 0x0000000000bc614eULL,
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0xffffffffffffffffLL, 0xffffffffffffaaf3ULL,
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0xfffffffffffffdc9LL, 0x0000000000000183LL},
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/* Negative dividend, positive/negative divisors */
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{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0x0000000000000001LL, 0x0000000000000000LL},
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{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0x0000000000000000LL, 0x0000000000bc614eULL,
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0xffffffffffffffffLL, 0x0000000000000000LL},
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{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0xffffffffffffffffLL, 0xffffffffffa1cf59ULL,
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0x0000000000000002LL, 0x0000000000000000LL},
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{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0x0000000000000000LL, 0x00000000005e30a7ULL,
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0xfffffffffffffffeLL, 0x0000000000000000LL},
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{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0xffffffffffffffffLL, 0xffffffffffe873d7ULL,
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0x0000000000000008LL, 0xfffffffffffffffaLL},
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{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0x0000000000000000LL, 0x0000000000178c29ULL,
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0xfffffffffffffff8LL, 0xfffffffffffffffaLL},
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{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0xffffffffffffffffLL, 0xffffffffffffaaf3ULL,
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0x0000000000000237LL, 0xfffffffffffffe7dLL},
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{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
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0x0000000000000000LL, 0x000000000000550dULL,
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0xfffffffffffffdc9LL, 0xfffffffffffffe7dLL},
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};
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static void test_divu128(void)
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{
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int i;
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uint64_t rem;
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test_data_unsigned tmp;
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for (i = 0; i < ARRAY_SIZE(test_table_unsigned); ++i) {
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tmp = test_table_unsigned[i];
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rem = divu128(&tmp.low, &tmp.high, tmp.divisor);
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g_assert_cmpuint(tmp.low, ==, tmp.rlow);
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g_assert_cmpuint(tmp.high, ==, tmp.rhigh);
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g_assert_cmpuint(rem, ==, tmp.remainder);
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}
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}
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static void test_divs128(void)
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{
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int i;
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int64_t rem;
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test_data_signed tmp;
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for (i = 0; i < ARRAY_SIZE(test_table_signed); ++i) {
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tmp = test_table_signed[i];
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rem = divs128(&tmp.low, &tmp.high, tmp.divisor);
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g_assert_cmpuint(tmp.low, ==, tmp.rlow);
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g_assert_cmpuint(tmp.high, ==, tmp.rhigh);
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g_assert_cmpuint(rem, ==, tmp.remainder);
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}
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}
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int main(int argc, char **argv)
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{
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g_test_init(&argc, &argv, NULL);
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g_test_add_func("/host-utils/test_divu128", test_divu128);
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g_test_add_func("/host-utils/test_divs128", test_divs128);
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return g_test_run();
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}
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