test-int128.c (9338B)
1 /* 2 * Test Int128 arithmetic 3 * 4 * This work is licensed under the terms of the GNU LGPL, version 2 or later. 5 * See the COPYING.LIB file in the top-level directory. 6 * 7 */ 8 9 #include "qemu/osdep.h" 10 #include "qemu/int128.h" 11 12 /* clang doesn't support __noclone__ but it does have a mechanism for 13 * telling us this. We assume that if we don't have __has_attribute() 14 * then this is GCC and that GCC always supports __noclone__. 15 */ 16 #if defined(__has_attribute) 17 #if !__has_attribute(__noclone__) 18 #define ATTRIBUTE_NOCLONE 19 #endif 20 #endif 21 #ifndef ATTRIBUTE_NOCLONE 22 #define ATTRIBUTE_NOCLONE __attribute__((__noclone__)) 23 #endif 24 25 static uint32_t tests[8] = { 26 0x00000000, 0x00000001, 0x7FFFFFFE, 0x7FFFFFFF, 27 0x80000000, 0x80000001, 0xFFFFFFFE, 0xFFFFFFFF, 28 }; 29 30 #define LOW 3ULL 31 #define HIGH (1ULL << 63) 32 #define MIDDLE (-1ULL & ~LOW & ~HIGH) 33 34 static uint64_t expand16(unsigned x) 35 { 36 return (x & LOW) | ((x & 4) ? MIDDLE : 0) | (x & 0x8000 ? HIGH : 0); 37 } 38 39 static Int128 expand(uint32_t x) 40 { 41 uint64_t l, h; 42 l = expand16(x & 65535); 43 h = expand16(x >> 16); 44 return (Int128) int128_make128(l, h); 45 }; 46 47 static void test_and(void) 48 { 49 int i, j; 50 51 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 52 for (j = 0; j < ARRAY_SIZE(tests); ++j) { 53 Int128 a = expand(tests[i]); 54 Int128 b = expand(tests[j]); 55 Int128 r = expand(tests[i] & tests[j]); 56 Int128 s = int128_and(a, b); 57 g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s)); 58 g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s)); 59 } 60 } 61 } 62 63 static void test_add(void) 64 { 65 int i, j; 66 67 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 68 for (j = 0; j < ARRAY_SIZE(tests); ++j) { 69 Int128 a = expand(tests[i]); 70 Int128 b = expand(tests[j]); 71 Int128 r = expand(tests[i] + tests[j]); 72 Int128 s = int128_add(a, b); 73 g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s)); 74 g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s)); 75 } 76 } 77 } 78 79 static void test_sub(void) 80 { 81 int i, j; 82 83 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 84 for (j = 0; j < ARRAY_SIZE(tests); ++j) { 85 Int128 a = expand(tests[i]); 86 Int128 b = expand(tests[j]); 87 Int128 r = expand(tests[i] - tests[j]); 88 Int128 s = int128_sub(a, b); 89 g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s)); 90 g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s)); 91 } 92 } 93 } 94 95 static void test_neg(void) 96 { 97 int i; 98 99 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 100 Int128 a = expand(tests[i]); 101 Int128 r = expand(-tests[i]); 102 Int128 s = int128_neg(a); 103 g_assert_cmpuint(int128_getlo(r), ==, int128_getlo(s)); 104 g_assert_cmpuint(int128_gethi(r), ==, int128_gethi(s)); 105 } 106 } 107 108 static void test_nz(void) 109 { 110 int i, j; 111 112 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 113 for (j = 0; j < ARRAY_SIZE(tests); ++j) { 114 Int128 a = expand(tests[i]); 115 g_assert_cmpuint(int128_nz(a), ==, tests[i] != 0); 116 } 117 } 118 } 119 120 static void test_le(void) 121 { 122 int i, j; 123 124 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 125 for (j = 0; j < ARRAY_SIZE(tests); ++j) { 126 /* Signed comparison */ 127 int32_t a = (int32_t) tests[i]; 128 int32_t b = (int32_t) tests[j]; 129 g_assert_cmpuint(int128_le(expand(a), expand(b)), ==, a <= b); 130 } 131 } 132 } 133 134 static void test_lt(void) 135 { 136 int i, j; 137 138 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 139 for (j = 0; j < ARRAY_SIZE(tests); ++j) { 140 /* Signed comparison */ 141 int32_t a = (int32_t) tests[i]; 142 int32_t b = (int32_t) tests[j]; 143 g_assert_cmpuint(int128_lt(expand(a), expand(b)), ==, a < b); 144 } 145 } 146 } 147 148 static void test_ge(void) 149 { 150 int i, j; 151 152 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 153 for (j = 0; j < ARRAY_SIZE(tests); ++j) { 154 /* Signed comparison */ 155 int32_t a = (int32_t) tests[i]; 156 int32_t b = (int32_t) tests[j]; 157 g_assert_cmpuint(int128_ge(expand(a), expand(b)), ==, a >= b); 158 } 159 } 160 } 161 162 static void test_gt(void) 163 { 164 int i, j; 165 166 for (i = 0; i < ARRAY_SIZE(tests); ++i) { 167 for (j = 0; j < ARRAY_SIZE(tests); ++j) { 168 /* Signed comparison */ 169 int32_t a = (int32_t) tests[i]; 170 int32_t b = (int32_t) tests[j]; 171 g_assert_cmpuint(int128_gt(expand(a), expand(b)), ==, a > b); 172 } 173 } 174 } 175 176 /* Make sure to test undefined behavior at runtime! */ 177 178 static void __attribute__((__noinline__)) ATTRIBUTE_NOCLONE 179 test_rshift_one(uint32_t x, int n, uint64_t h, uint64_t l) 180 { 181 Int128 a = expand(x); 182 Int128 r = int128_rshift(a, n); 183 g_assert_cmpuint(int128_getlo(r), ==, l); 184 g_assert_cmpuint(int128_gethi(r), ==, h); 185 } 186 187 static void test_rshift(void) 188 { 189 test_rshift_one(0x00010000U, 64, 0x0000000000000000ULL, 0x0000000000000001ULL); 190 test_rshift_one(0x80010000U, 64, 0xFFFFFFFFFFFFFFFFULL, 0x8000000000000001ULL); 191 test_rshift_one(0x7FFE0000U, 64, 0x0000000000000000ULL, 0x7FFFFFFFFFFFFFFEULL); 192 test_rshift_one(0xFFFE0000U, 64, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFEULL); 193 test_rshift_one(0x00010000U, 60, 0x0000000000000000ULL, 0x0000000000000010ULL); 194 test_rshift_one(0x80010000U, 60, 0xFFFFFFFFFFFFFFF8ULL, 0x0000000000000010ULL); 195 test_rshift_one(0x00018000U, 60, 0x0000000000000000ULL, 0x0000000000000018ULL); 196 test_rshift_one(0x80018000U, 60, 0xFFFFFFFFFFFFFFF8ULL, 0x0000000000000018ULL); 197 test_rshift_one(0x7FFE0000U, 60, 0x0000000000000007ULL, 0xFFFFFFFFFFFFFFE0ULL); 198 test_rshift_one(0xFFFE0000U, 60, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFE0ULL); 199 test_rshift_one(0x7FFE8000U, 60, 0x0000000000000007ULL, 0xFFFFFFFFFFFFFFE8ULL); 200 test_rshift_one(0xFFFE8000U, 60, 0xFFFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFE8ULL); 201 test_rshift_one(0x00018000U, 0, 0x0000000000000001ULL, 0x8000000000000000ULL); 202 test_rshift_one(0x80018000U, 0, 0x8000000000000001ULL, 0x8000000000000000ULL); 203 test_rshift_one(0x7FFE0000U, 0, 0x7FFFFFFFFFFFFFFEULL, 0x0000000000000000ULL); 204 test_rshift_one(0xFFFE0000U, 0, 0xFFFFFFFFFFFFFFFEULL, 0x0000000000000000ULL); 205 test_rshift_one(0x7FFE8000U, 0, 0x7FFFFFFFFFFFFFFEULL, 0x8000000000000000ULL); 206 test_rshift_one(0xFFFE8000U, 0, 0xFFFFFFFFFFFFFFFEULL, 0x8000000000000000ULL); 207 } 208 209 static void __attribute__((__noinline__)) ATTRIBUTE_NOCLONE 210 test_urshift_one(uint32_t x, int n, uint64_t h, uint64_t l) 211 { 212 Int128 a = expand(x); 213 Int128 r = int128_urshift(a, n); 214 g_assert_cmpuint(int128_getlo(r), ==, l); 215 g_assert_cmpuint(int128_gethi(r), ==, h); 216 } 217 218 static void test_urshift(void) 219 { 220 test_urshift_one(0x00010000U, 64, 0x0000000000000000ULL, 221 0x0000000000000001ULL); 222 test_urshift_one(0x80010000U, 64, 0x0000000000000000ULL, 223 0x8000000000000001ULL); 224 test_urshift_one(0x7FFE0000U, 64, 0x0000000000000000ULL, 225 0x7FFFFFFFFFFFFFFEULL); 226 test_urshift_one(0xFFFE0000U, 64, 0x0000000000000000ULL, 227 0xFFFFFFFFFFFFFFFEULL); 228 test_urshift_one(0x00010000U, 60, 0x0000000000000000ULL, 229 0x0000000000000010ULL); 230 test_urshift_one(0x80010000U, 60, 0x0000000000000008ULL, 231 0x0000000000000010ULL); 232 test_urshift_one(0x00018000U, 60, 0x0000000000000000ULL, 233 0x0000000000000018ULL); 234 test_urshift_one(0x80018000U, 60, 0x0000000000000008ULL, 235 0x0000000000000018ULL); 236 test_urshift_one(0x7FFE0000U, 60, 0x0000000000000007ULL, 237 0xFFFFFFFFFFFFFFE0ULL); 238 test_urshift_one(0xFFFE0000U, 60, 0x000000000000000FULL, 239 0xFFFFFFFFFFFFFFE0ULL); 240 test_urshift_one(0x7FFE8000U, 60, 0x0000000000000007ULL, 241 0xFFFFFFFFFFFFFFE8ULL); 242 test_urshift_one(0xFFFE8000U, 60, 0x000000000000000FULL, 243 0xFFFFFFFFFFFFFFE8ULL); 244 test_urshift_one(0x00018000U, 0, 0x0000000000000001ULL, 245 0x8000000000000000ULL); 246 test_urshift_one(0x80018000U, 0, 0x8000000000000001ULL, 247 0x8000000000000000ULL); 248 test_urshift_one(0x7FFE0000U, 0, 0x7FFFFFFFFFFFFFFEULL, 249 0x0000000000000000ULL); 250 test_urshift_one(0xFFFE0000U, 0, 0xFFFFFFFFFFFFFFFEULL, 251 0x0000000000000000ULL); 252 test_urshift_one(0x7FFE8000U, 0, 0x7FFFFFFFFFFFFFFEULL, 253 0x8000000000000000ULL); 254 test_urshift_one(0xFFFE8000U, 0, 0xFFFFFFFFFFFFFFFEULL, 255 0x8000000000000000ULL); 256 } 257 258 int main(int argc, char **argv) 259 { 260 g_test_init(&argc, &argv, NULL); 261 g_test_add_func("/int128/int128_and", test_and); 262 g_test_add_func("/int128/int128_add", test_add); 263 g_test_add_func("/int128/int128_sub", test_sub); 264 g_test_add_func("/int128/int128_neg", test_neg); 265 g_test_add_func("/int128/int128_nz", test_nz); 266 g_test_add_func("/int128/int128_le", test_le); 267 g_test_add_func("/int128/int128_lt", test_lt); 268 g_test_add_func("/int128/int128_ge", test_ge); 269 g_test_add_func("/int128/int128_gt", test_gt); 270 g_test_add_func("/int128/int128_rshift", test_rshift); 271 g_test_add_func("/int128/int128_urshift", test_urshift); 272 return g_test_run(); 273 }