tests: Move unit tests into a separate directory

The main tests directory still looks very crowded, and it's not
clear which files are part of a unit tests and which belong to
a different test subsystem. Let's clean up the mess and move the
unit tests to a separate directory.

Message-Id: <20210310063314.1049838-1-thuth@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 223 insertions, 0 deletions

diff --git a/tests/unit/test-int128.c b/tests/unit/test-int128.c
new file mode 100644
index 0000000000..b86a3c76e6
--- /dev/null
+++ b/tests/unit/test-int128.c
@@ -0,0 +1,223 @@
+/*
+ * 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);
+}
+
+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();
+}