224 lines
6.9 KiB
C
224 lines
6.9 KiB
C
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/*
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* Test Int128 arithmetic
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/int128.h"
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/* clang doesn't support __noclone__ but it does have a mechanism for
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* telling us this. We assume that if we don't have __has_attribute()
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* then this is GCC and that GCC always supports __noclone__.
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*/
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#if defined(__has_attribute)
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#if !__has_attribute(__noclone__)
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#define ATTRIBUTE_NOCLONE
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#endif
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#endif
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#ifndef ATTRIBUTE_NOCLONE
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#define ATTRIBUTE_NOCLONE __attribute__((__noclone__))
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#endif
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static uint32_t tests[8] = {
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0x00000000, 0x00000001, 0x7FFFFFFE, 0x7FFFFFFF,
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0x80000000, 0x80000001, 0xFFFFFFFE, 0xFFFFFFFF,
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};
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#define LOW 3ULL
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#define HIGH (1ULL << 63)
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#define MIDDLE (-1ULL & ~LOW & ~HIGH)
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static uint64_t expand16(unsigned x)
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{
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return (x & LOW) | ((x & 4) ? MIDDLE : 0) | (x & 0x8000 ? HIGH : 0);
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}
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static Int128 expand(uint32_t x)
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{
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uint64_t l, h;
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l = expand16(x & 65535);
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h = expand16(x >> 16);
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return (Int128) int128_make128(l, h);
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};
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static void test_and(void)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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for (j = 0; j < ARRAY_SIZE(tests); ++j) {
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Int128 a = expand(tests[i]);
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Int128 b = expand(tests[j]);
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Int128 r = expand(tests[i] & tests[j]);
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Int128 s = int128_and(a, b);
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g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s));
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g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s));
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}
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}
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}
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static void test_add(void)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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for (j = 0; j < ARRAY_SIZE(tests); ++j) {
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Int128 a = expand(tests[i]);
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Int128 b = expand(tests[j]);
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Int128 r = expand(tests[i] + tests[j]);
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Int128 s = int128_add(a, b);
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g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s));
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g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s));
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}
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}
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}
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static void test_sub(void)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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for (j = 0; j < ARRAY_SIZE(tests); ++j) {
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Int128 a = expand(tests[i]);
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Int128 b = expand(tests[j]);
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Int128 r = expand(tests[i] - tests[j]);
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Int128 s = int128_sub(a, b);
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g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s));
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g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s));
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}
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}
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}
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static void test_neg(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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Int128 a = expand(tests[i]);
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Int128 r = expand(-tests[i]);
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Int128 s = int128_neg(a);
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g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s));
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g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s));
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}
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}
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static void test_nz(void)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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for (j = 0; j < ARRAY_SIZE(tests); ++j) {
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Int128 a = expand(tests[i]);
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g_assert_cmpuint(int128_nz(a), ==, tests[i] != 0);
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}
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}
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}
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static void test_le(void)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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for (j = 0; j < ARRAY_SIZE(tests); ++j) {
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/* Signed comparison */
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int32_t a = (int32_t) tests[i];
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int32_t b = (int32_t) tests[j];
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g_assert_cmpuint(int128_le(expand(a), expand(b)), ==, a <= b);
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}
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}
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}
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static void test_lt(void)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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for (j = 0; j < ARRAY_SIZE(tests); ++j) {
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/* Signed comparison */
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int32_t a = (int32_t) tests[i];
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int32_t b = (int32_t) tests[j];
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g_assert_cmpuint(int128_lt(expand(a), expand(b)), ==, a < b);
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}
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}
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}
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static void test_ge(void)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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for (j = 0; j < ARRAY_SIZE(tests); ++j) {
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/* Signed comparison */
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int32_t a = (int32_t) tests[i];
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int32_t b = (int32_t) tests[j];
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g_assert_cmpuint(int128_ge(expand(a), expand(b)), ==, a >= b);
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}
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}
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}
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static void test_gt(void)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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for (j = 0; j < ARRAY_SIZE(tests); ++j) {
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/* Signed comparison */
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int32_t a = (int32_t) tests[i];
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int32_t b = (int32_t) tests[j];
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g_assert_cmpuint(int128_gt(expand(a), expand(b)), ==, a > b);
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}
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}
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}
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/* Make sure to test undefined behavior at runtime! */
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static void __attribute__((__noinline__)) ATTRIBUTE_NOCLONE
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test_rshift_one(uint32_t x, int n, uint64_t h, uint64_t l)
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{
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Int128 a = expand(x);
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Int128 r = int128_rshift(a, n);
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g_assert_cmpuint(int128_getlo(r), ==, l);
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g_assert_cmpuint(int128_gethi(r), ==, h);
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}
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static void test_rshift(void)
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{
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test_rshift_one(0x00010000U, 64, 0x0000000000000000ULL, 0x0000000000000001ULL);
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test_rshift_one(0x80010000U, 64, 0xFFFFFFFFFFFFFFFFULL, 0x8000000000000001ULL);
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test_rshift_one(0x7FFE0000U, 64, 0x0000000000000000ULL, 0x7FFFFFFFFFFFFFFEULL);
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test_rshift_one(0xFFFE0000U, 64, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFEULL);
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test_rshift_one(0x00010000U, 60, 0x0000000000000000ULL, 0x0000000000000010ULL);
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test_rshift_one(0x80010000U, 60, 0xFFFFFFFFFFFFFFF8ULL, 0x0000000000000010ULL);
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test_rshift_one(0x00018000U, 60, 0x0000000000000000ULL, 0x0000000000000018ULL);
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test_rshift_one(0x80018000U, 60, 0xFFFFFFFFFFFFFFF8ULL, 0x0000000000000018ULL);
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test_rshift_one(0x7FFE0000U, 60, 0x0000000000000007ULL, 0xFFFFFFFFFFFFFFE0ULL);
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test_rshift_one(0xFFFE0000U, 60, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFE0ULL);
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test_rshift_one(0x7FFE8000U, 60, 0x0000000000000007ULL, 0xFFFFFFFFFFFFFFE8ULL);
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test_rshift_one(0xFFFE8000U, 60, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFE8ULL);
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test_rshift_one(0x00018000U, 0, 0x0000000000000001ULL, 0x8000000000000000ULL);
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test_rshift_one(0x80018000U, 0, 0x8000000000000001ULL, 0x8000000000000000ULL);
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test_rshift_one(0x7FFE0000U, 0, 0x7FFFFFFFFFFFFFFEULL, 0x0000000000000000ULL);
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test_rshift_one(0xFFFE0000U, 0, 0xFFFFFFFFFFFFFFFEULL, 0x0000000000000000ULL);
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test_rshift_one(0x7FFE8000U, 0, 0x7FFFFFFFFFFFFFFEULL, 0x8000000000000000ULL);
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test_rshift_one(0xFFFE8000U, 0, 0xFFFFFFFFFFFFFFFEULL, 0x8000000000000000ULL);
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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("/int128/int128_and", test_and);
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g_test_add_func("/int128/int128_add", test_add);
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g_test_add_func("/int128/int128_sub", test_sub);
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g_test_add_func("/int128/int128_neg", test_neg);
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g_test_add_func("/int128/int128_nz", test_nz);
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g_test_add_func("/int128/int128_le", test_le);
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g_test_add_func("/int128/int128_lt", test_lt);
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g_test_add_func("/int128/int128_ge", test_ge);
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g_test_add_func("/int128/int128_gt", test_gt);
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g_test_add_func("/int128/int128_rshift", test_rshift);
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return g_test_run();
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}
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