aboutsummaryrefslogtreecommitdiff
path: root/tests/test-int128.c
diff options
context:
space:
mode:
Diffstat (limited to 'tests/test-int128.c')
-rw-r--r--tests/test-int128.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/tests/test-int128.c b/tests/test-int128.c
new file mode 100644
index 0000000000..5aca032e0c
--- /dev/null
+++ b/tests/test-int128.c
@@ -0,0 +1,212 @@
+/*
+ * 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 <glib.h>
+#include <stdio.h>
+#include "qemu/int128.h"
+#include "qemu/osdep.h"
+
+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) {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(r.lo, ==, s.lo);
+ g_assert_cmpuint(r.hi, ==, s.hi);
+ }
+ }
+}
+
+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(r.lo, ==, s.lo);
+ g_assert_cmpuint(r.hi, ==, s.hi);
+ }
+ }
+}
+
+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(r.lo, ==, s.lo);
+ g_assert_cmpuint(r.hi, ==, s.hi);
+ }
+ }
+}
+
+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(r.lo, ==, s.lo);
+ g_assert_cmpuint(r.hi, ==, s.hi);
+ }
+}
+
+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__, __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(r.lo, ==, l);
+ g_assert_cmpuint(r.hi, ==, 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);
+}
+
+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);
+ return g_test_run();
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-27 05:22:59 +0000