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qemu/tests/unit/test-int128.c
Matheus Ferst 613cf0fcba qemu/int128: add int128_urshift 
Implement an unsigned right shift for Int128 values and add the same
tests cases of int128_rshift in the unit test.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220330175932.6995-3-matheus.ferst@eldorado.org.br>
[danielhb: fixed long lines in test_urshift()]
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2022-04-20 18:00:30 -03:00

274 lines
9.1 KiB
C
Raw Blame History

/*
* Test Int128 arithmetic
*
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu/int128.h"
/* clang doesn't support __noclone__ but it does have a mechanism for
* telling us this. We assume that if we don't have __has_attribute()
* then this is GCC and that GCC always supports __noclone__.
*/
#if defined(__has_attribute)
#if !__has_attribute(__noclone__)
#define ATTRIBUTE_NOCLONE
#endif
#endif
#ifndef ATTRIBUTE_NOCLONE
#define ATTRIBUTE_NOCLONE __attribute__((__noclone__))
#endif
static uint32_t tests[8] = {
0x00000000, 0x00000001, 0x7FFFFFFE, 0x7FFFFFFF,
0x80000000, 0x80000001, 0xFFFFFFFE, 0xFFFFFFFF,
};
#define LOW 3ULL
#define HIGH (1ULL << 63)
#define MIDDLE (-1ULL & ~LOW & ~HIGH)
static uint64_t expand16(unsigned x)
{
return (x & LOW) | ((x & 4) ? MIDDLE : 0) | (x & 0x8000 ? HIGH : 0);
}
static Int128 expand(uint32_t x)
{
uint64_t l, h;
l = expand16(x & 65535);
h = expand16(x >> 16);
return (Int128) int128_make128(l, h);
};
static void test_and(void)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
for (j = 0; j < ARRAY_SIZE(tests); ++j) {
Int128 a = expand(tests[i]);
Int128 b = expand(tests[j]);
Int128 r = expand(tests[i] & tests[j]);
Int128 s = int128_and(a, b);
g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s));
g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s));
}
}
}
static void test_add(void)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
for (j = 0; j < ARRAY_SIZE(tests); ++j) {
Int128 a = expand(tests[i]);
Int128 b = expand(tests[j]);
Int128 r = expand(tests[i] + tests[j]);
Int128 s = int128_add(a, b);
g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s));
g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s));
}
}
}
static void test_sub(void)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
for (j = 0; j < ARRAY_SIZE(tests); ++j) {
Int128 a = expand(tests[i]);
Int128 b = expand(tests[j]);
Int128 r = expand(tests[i] - tests[j]);
Int128 s = int128_sub(a, b);
g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s));
g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s));
}
}
}
static void test_neg(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
Int128 a = expand(tests[i]);
Int128 r = expand(-tests[i]);
Int128 s = int128_neg(a);
g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s));
g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s));
}
}
static void test_nz(void)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
for (j = 0; j < ARRAY_SIZE(tests); ++j) {
Int128 a = expand(tests[i]);
g_assert_cmpuint(int128_nz(a), ==, tests[i] != 0);
}
}
}
static void test_le(void)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
for (j = 0; j < ARRAY_SIZE(tests); ++j) {
/* Signed comparison */
int32_t a = (int32_t) tests[i];
int32_t b = (int32_t) tests[j];
g_assert_cmpuint(int128_le(expand(a), expand(b)), ==, a <= b);
}
}
}
static void test_lt(void)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
for (j = 0; j < ARRAY_SIZE(tests); ++j) {
/* Signed comparison */
int32_t a = (int32_t) tests[i];
int32_t b = (int32_t) tests[j];
g_assert_cmpuint(int128_lt(expand(a), expand(b)), ==, a < b);
}
}
}
static void test_ge(void)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
for (j = 0; j < ARRAY_SIZE(tests); ++j) {
/* Signed comparison */
int32_t a = (int32_t) tests[i];
int32_t b = (int32_t) tests[j];
g_assert_cmpuint(int128_ge(expand(a), expand(b)), ==, a >= b);
}
}
}
static void test_gt(void)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(tests); ++i) {
for (j = 0; j < ARRAY_SIZE(tests); ++j) {
/* Signed comparison */
int32_t a = (int32_t) tests[i];
int32_t b = (int32_t) tests[j];
g_assert_cmpuint(int128_gt(expand(a), expand(b)), ==, a > b);
}
}
}
/* Make sure to test undefined behavior at runtime! */
static void __attribute__((__noinline__)) ATTRIBUTE_NOCLONE
test_rshift_one(uint32_t x, int n, uint64_t h, uint64_t l)
{
Int128 a = expand(x);
Int128 r = int128_rshift(a, n);
g_assert_cmpuint(int128_getlo(r), ==, l);
g_assert_cmpuint(int128_gethi(r), ==, h);
}
static void test_rshift(void)
{
test_rshift_one(0x00010000U, 64, 0x0000000000000000ULL, 0x0000000000000001ULL);
test_rshift_one(0x80010000U, 64, 0xFFFFFFFFFFFFFFFFULL, 0x8000000000000001ULL);
test_rshift_one(0x7FFE0000U, 64, 0x0000000000000000ULL, 0x7FFFFFFFFFFFFFFEULL);
test_rshift_one(0xFFFE0000U, 64, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFEULL);
test_rshift_one(0x00010000U, 60, 0x0000000000000000ULL, 0x0000000000000010ULL);
test_rshift_one(0x80010000U, 60, 0xFFFFFFFFFFFFFFF8ULL, 0x0000000000000010ULL);
test_rshift_one(0x00018000U, 60, 0x0000000000000000ULL, 0x0000000000000018ULL);
test_rshift_one(0x80018000U, 60, 0xFFFFFFFFFFFFFFF8ULL, 0x0000000000000018ULL);
test_rshift_one(0x7FFE0000U, 60, 0x0000000000000007ULL, 0xFFFFFFFFFFFFFFE0ULL);
test_rshift_one(0xFFFE0000U, 60, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFE0ULL);
test_rshift_one(0x7FFE8000U, 60, 0x0000000000000007ULL, 0xFFFFFFFFFFFFFFE8ULL);
test_rshift_one(0xFFFE8000U, 60, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFE8ULL);
test_rshift_one(0x00018000U, 0, 0x0000000000000001ULL, 0x8000000000000000ULL);
test_rshift_one(0x80018000U, 0, 0x8000000000000001ULL, 0x8000000000000000ULL);
test_rshift_one(0x7FFE0000U, 0, 0x7FFFFFFFFFFFFFFEULL, 0x0000000000000000ULL);
test_rshift_one(0xFFFE0000U, 0, 0xFFFFFFFFFFFFFFFEULL, 0x0000000000000000ULL);
test_rshift_one(0x7FFE8000U, 0, 0x7FFFFFFFFFFFFFFEULL, 0x8000000000000000ULL);
test_rshift_one(0xFFFE8000U, 0, 0xFFFFFFFFFFFFFFFEULL, 0x8000000000000000ULL);
}
static void __attribute__((__noinline__)) ATTRIBUTE_NOCLONE
test_urshift_one(uint32_t x, int n, uint64_t h, uint64_t l)
{
Int128 a = expand(x);
Int128 r = int128_urshift(a, n);
g_assert_cmpuint(int128_getlo(r), ==, l);
g_assert_cmpuint(int128_gethi(r), ==, h);
}
static void test_urshift(void)
{
test_urshift_one(0x00010000U, 64, 0x0000000000000000ULL,
0x0000000000000001ULL);
test_urshift_one(0x80010000U, 64, 0x0000000000000000ULL,
0x8000000000000001ULL);
test_urshift_one(0x7FFE0000U, 64, 0x0000000000000000ULL,
0x7FFFFFFFFFFFFFFEULL);
test_urshift_one(0xFFFE0000U, 64, 0x0000000000000000ULL,
0xFFFFFFFFFFFFFFFEULL);
test_urshift_one(0x00010000U, 60, 0x0000000000000000ULL,
0x0000000000000010ULL);
test_urshift_one(0x80010000U, 60, 0x0000000000000008ULL,
0x0000000000000010ULL);
test_urshift_one(0x00018000U, 60, 0x0000000000000000ULL,
0x0000000000000018ULL);
test_urshift_one(0x80018000U, 60, 0x0000000000000008ULL,
0x0000000000000018ULL);
test_urshift_one(0x7FFE0000U, 60, 0x0000000000000007ULL,
0xFFFFFFFFFFFFFFE0ULL);
test_urshift_one(0xFFFE0000U, 60, 0x000000000000000FULL,
0xFFFFFFFFFFFFFFE0ULL);
test_urshift_one(0x7FFE8000U, 60, 0x0000000000000007ULL,
0xFFFFFFFFFFFFFFE8ULL);
test_urshift_one(0xFFFE8000U, 60, 0x000000000000000FULL,
0xFFFFFFFFFFFFFFE8ULL);
test_urshift_one(0x00018000U, 0, 0x0000000000000001ULL,
0x8000000000000000ULL);
test_urshift_one(0x80018000U, 0, 0x8000000000000001ULL,
0x8000000000000000ULL);
test_urshift_one(0x7FFE0000U, 0, 0x7FFFFFFFFFFFFFFEULL,
0x0000000000000000ULL);
test_urshift_one(0xFFFE0000U, 0, 0xFFFFFFFFFFFFFFFEULL,
0x0000000000000000ULL);
test_urshift_one(0x7FFE8000U, 0, 0x7FFFFFFFFFFFFFFEULL,
0x8000000000000000ULL);
test_urshift_one(0xFFFE8000U, 0, 0xFFFFFFFFFFFFFFFEULL,
0x8000000000000000ULL);
}
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
g_test_add_func("/int128/int128_and", test_and);
g_test_add_func("/int128/int128_add", test_add);
g_test_add_func("/int128/int128_sub", test_sub);
g_test_add_func("/int128/int128_neg", test_neg);
g_test_add_func("/int128/int128_nz", test_nz);
g_test_add_func("/int128/int128_le", test_le);
g_test_add_func("/int128/int128_lt", test_lt);
g_test_add_func("/int128/int128_ge", test_ge);
g_test_add_func("/int128/int128_gt", test_gt);
g_test_add_func("/int128/int128_rshift", test_rshift);
g_test_add_func("/int128/int128_urshift", test_urshift);
return g_test_run();
}
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