1 /* Test intprops.h.
2 Copyright (C) 2011-2018 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* Written by Paul Eggert. */
18
19 /* Tell gcc not to warn about the long expressions that the overflow
20 macros expand to, or about the (X < 0) expressions. */
21 #if 4 < __GNUC__ + (3 <= __GNUC_MINOR__)
22 # pragma GCC diagnostic ignored "-Woverlength-strings"
23 # pragma GCC diagnostic ignored "-Wtype-limits"
24
25 /* Work around a bug in GCC 6.1 and earlier; see:
26 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68971 */
27 # pragma GCC diagnostic ignored "-Woverflow"
28
29 #endif
30
31 #include <config.h>
32
33 #include "intprops.h"
34 #include "verify.h"
35
36 #include <stdbool.h>
37 #include <inttypes.h>
38 #include <limits.h>
39
40 #include "macros.h"
41
42 /* VERIFY (X) uses a static assertion for compilers that are known to work,
43 and falls back on a dynamic assertion for other compilers.
44 These tests should be checkable via 'verify' rather than 'ASSERT', but
45 using 'verify' would run into a bug with HP-UX 11.23 cc; see
46 <https://lists.gnu.org/r/bug-gnulib/2011-05/msg00401.html>. */
47 #if __GNUC__ || __SUNPRO_C
48 # define VERIFY(x) do { verify (x); } while (0)
49 #else
50 # define VERIFY(x) ASSERT (x)
51 #endif
52
53 #define DONTCARE __LINE__
54
55 int
main(void)56 main (void)
57 {
58 /* Use VERIFY for tests that must be integer constant expressions,
59 ASSERT otherwise. */
60
61 /* TYPE_IS_INTEGER. */
62 ASSERT (TYPE_IS_INTEGER (bool));
63 ASSERT (TYPE_IS_INTEGER (char));
64 ASSERT (TYPE_IS_INTEGER (signed char));
65 ASSERT (TYPE_IS_INTEGER (unsigned char));
66 ASSERT (TYPE_IS_INTEGER (short int));
67 ASSERT (TYPE_IS_INTEGER (unsigned short int));
68 ASSERT (TYPE_IS_INTEGER (int));
69 ASSERT (TYPE_IS_INTEGER (unsigned int));
70 ASSERT (TYPE_IS_INTEGER (long int));
71 ASSERT (TYPE_IS_INTEGER (unsigned long int));
72 ASSERT (TYPE_IS_INTEGER (intmax_t));
73 ASSERT (TYPE_IS_INTEGER (uintmax_t));
74 ASSERT (! TYPE_IS_INTEGER (float));
75 ASSERT (! TYPE_IS_INTEGER (double));
76 ASSERT (! TYPE_IS_INTEGER (long double));
77
78 /* TYPE_SIGNED. */
79 /* VERIFY (! TYPE_SIGNED (bool)); // not guaranteed by gnulib substitute */
80 VERIFY (TYPE_SIGNED (signed char));
81 VERIFY (! TYPE_SIGNED (unsigned char));
82 VERIFY (TYPE_SIGNED (short int));
83 VERIFY (! TYPE_SIGNED (unsigned short int));
84 VERIFY (TYPE_SIGNED (int));
85 VERIFY (! TYPE_SIGNED (unsigned int));
86 VERIFY (TYPE_SIGNED (long int));
87 VERIFY (! TYPE_SIGNED (unsigned long int));
88 VERIFY (TYPE_SIGNED (intmax_t));
89 VERIFY (! TYPE_SIGNED (uintmax_t));
90 ASSERT (TYPE_SIGNED (float));
91 ASSERT (TYPE_SIGNED (double));
92 ASSERT (TYPE_SIGNED (long double));
93
94 /* Integer representation. Check that it is two's complement. */
95 VERIFY (INT_MIN + INT_MAX < 0);
96
97 /* TYPE_MINIMUM, TYPE_MAXIMUM. */
98 VERIFY (TYPE_MINIMUM (char) == CHAR_MIN);
99 VERIFY (TYPE_MAXIMUM (char) == CHAR_MAX);
100 VERIFY (TYPE_MINIMUM (unsigned char) == 0);
101 VERIFY (TYPE_MAXIMUM (unsigned char) == UCHAR_MAX);
102 VERIFY (TYPE_MINIMUM (signed char) == SCHAR_MIN);
103 VERIFY (TYPE_MAXIMUM (signed char) == SCHAR_MAX);
104 VERIFY (TYPE_MINIMUM (short int) == SHRT_MIN);
105 VERIFY (TYPE_MAXIMUM (short int) == SHRT_MAX);
106 VERIFY (TYPE_MINIMUM (unsigned short int) == 0);
107 VERIFY (TYPE_MAXIMUM (unsigned short int) == USHRT_MAX);
108 VERIFY (TYPE_MINIMUM (int) == INT_MIN);
109 VERIFY (TYPE_MAXIMUM (int) == INT_MAX);
110 VERIFY (TYPE_MINIMUM (unsigned int) == 0);
111 VERIFY (TYPE_MAXIMUM (unsigned int) == UINT_MAX);
112 VERIFY (TYPE_MINIMUM (long int) == LONG_MIN);
113 VERIFY (TYPE_MAXIMUM (long int) == LONG_MAX);
114 VERIFY (TYPE_MINIMUM (unsigned long int) == 0);
115 VERIFY (TYPE_MAXIMUM (unsigned long int) == ULONG_MAX);
116 #ifdef LLONG_MAX
117 verify (TYPE_MINIMUM (long long int) == LLONG_MIN);
118 verify (TYPE_MAXIMUM (long long int) == LLONG_MAX);
119 #endif
120 VERIFY (TYPE_MINIMUM (intmax_t) == INTMAX_MIN);
121 VERIFY (TYPE_MAXIMUM (intmax_t) == INTMAX_MAX);
122 VERIFY (TYPE_MINIMUM (uintmax_t) == 0);
123 VERIFY (TYPE_MAXIMUM (uintmax_t) == UINTMAX_MAX);
124
125 /* TYPE_WIDTH. */
126 #ifdef CHAR_WIDTH
127 verify (TYPE_WIDTH (char) == CHAR_WIDTH);
128 verify (TYPE_WIDTH (signed char) == SCHAR_WIDTH);
129 verify (TYPE_WIDTH (unsigned char) == UCHAR_WIDTH);
130 verify (TYPE_WIDTH (short int) == SHRT_WIDTH);
131 verify (TYPE_WIDTH (unsigned short int) == USHRT_WIDTH);
132 verify (TYPE_WIDTH (int) == INT_WIDTH);
133 verify (TYPE_WIDTH (unsigned int) == UINT_WIDTH);
134 verify (TYPE_WIDTH (long int) == LONG_WIDTH);
135 verify (TYPE_WIDTH (unsigned long int) == ULONG_WIDTH);
136 #ifdef LLONG_WIDTH
137 verify (TYPE_WIDTH (long long int) == LLONG_WIDTH);
138 verify (TYPE_WIDTH (unsigned long long int) == ULLONG_WIDTH);
139 #endif
140 #endif
141
142 /* INT_BITS_STRLEN_BOUND. */
143 VERIFY (INT_BITS_STRLEN_BOUND (1) == 1);
144 VERIFY (INT_BITS_STRLEN_BOUND (2620) == 789);
145
146 /* INT_STRLEN_BOUND, INT_BUFSIZE_BOUND. */
147 #ifdef INT32_MAX /* POSIX guarantees int32_t; this ports to non-POSIX. */
148 VERIFY (INT_STRLEN_BOUND (int32_t) == sizeof ("-2147483648") - 1);
149 VERIFY (INT_BUFSIZE_BOUND (int32_t) == sizeof ("-2147483648"));
150 #endif
151 #ifdef INT64_MAX
152 VERIFY (INT_STRLEN_BOUND (int64_t) == sizeof ("-9223372036854775808") - 1);
153 VERIFY (INT_BUFSIZE_BOUND (int64_t) == sizeof ("-9223372036854775808"));
154 #endif
155
156 /* All the INT_<op>_RANGE_OVERFLOW tests are equally valid as
157 INT_<op>_OVERFLOW tests, so define macros to do both. OP is the
158 operation, OPNAME its symbolic name, A and B its operands, T the
159 result type, V the overflow flag, and VRES the result if V and if
160 two's complement. CHECK_BINOP is for most binary operatinos,
161 CHECK_SBINOP for binary +, -, * when the result type is signed,
162 and CHECK_UNOP for unary operations. */
163 #define CHECK_BINOP(op, opname, a, b, t, v, vres) \
164 VERIFY (INT_##opname##_RANGE_OVERFLOW (a, b, TYPE_MINIMUM (t), \
165 TYPE_MAXIMUM (t)) \
166 == (v)); \
167 VERIFY (INT_##opname##_OVERFLOW (a, b) == (v))
168 #define CHECK_SBINOP(op, opname, a, b, t, v, vres) \
169 CHECK_BINOP(op, opname, a, b, t, v, vres); \
170 { \
171 t result; \
172 ASSERT (INT_##opname##_WRAPV (a, b, &result) == (v)); \
173 ASSERT (result == ((v) ? (vres) : ((a) op (b)))); \
174 }
175 #define CHECK_UNOP(op, opname, a, t, v) \
176 VERIFY (INT_##opname##_RANGE_OVERFLOW (a, TYPE_MINIMUM (t), \
177 TYPE_MAXIMUM (t)) \
178 == (v)); \
179 VERIFY (INT_##opname##_OVERFLOW (a) == (v))
180
181 /* INT_<op>_RANGE_OVERFLOW, INT_<op>_OVERFLOW. */
182 VERIFY (INT_ADD_RANGE_OVERFLOW (INT_MAX, 1, INT_MIN, INT_MAX));
183 VERIFY (INT_ADD_OVERFLOW (INT_MAX, 1));
184
185 CHECK_SBINOP (+, ADD, INT_MAX, 1, int, true, INT_MIN);
186 CHECK_SBINOP (+, ADD, INT_MAX, -1, int, false, INT_MAX - 1);
187 CHECK_SBINOP (+, ADD, INT_MIN, 1, int, false, INT_MIN + 1);
188 CHECK_SBINOP (+, ADD, INT_MIN, -1, int, true, INT_MAX);
189 CHECK_BINOP (+, ADD, UINT_MAX, 1u, unsigned int, true, 0u);
190 CHECK_BINOP (+, ADD, 0u, 1u, unsigned int, false, 1u);
191
192 CHECK_SBINOP (-, SUBTRACT, INT_MAX, 1, int, false, INT_MAX - 1);
193 CHECK_SBINOP (-, SUBTRACT, INT_MAX, -1, int, true, INT_MIN);
194 CHECK_SBINOP (-, SUBTRACT, INT_MIN, 1, int, true, INT_MAX);
195 CHECK_SBINOP (-, SUBTRACT, INT_MIN, -1, int, false, INT_MIN - -1);
196 CHECK_BINOP (-, SUBTRACT, UINT_MAX, 1u, unsigned int, false, UINT_MAX - 1u);
197 CHECK_BINOP (-, SUBTRACT, 0u, 1u, unsigned int, true, 0u - 1u);
198
199 CHECK_UNOP (-, NEGATE, INT_MIN, int, true);
200 CHECK_UNOP (-, NEGATE, 0, int, false);
201 CHECK_UNOP (-, NEGATE, INT_MAX, int, false);
202 CHECK_UNOP (-, NEGATE, 0u, unsigned int, false);
203 CHECK_UNOP (-, NEGATE, 1u, unsigned int, true);
204 CHECK_UNOP (-, NEGATE, UINT_MAX, unsigned int, true);
205
206 CHECK_SBINOP (*, MULTIPLY, INT_MAX, INT_MAX, int, true, 1);
207 CHECK_SBINOP (*, MULTIPLY, INT_MAX, INT_MIN, int, true, INT_MIN);
208 CHECK_SBINOP (*, MULTIPLY, INT_MIN, INT_MAX, int, true, INT_MIN);
209 CHECK_SBINOP (*, MULTIPLY, INT_MIN, INT_MIN, int, true, 0);
210 CHECK_SBINOP (*, MULTIPLY, -1, INT_MIN, int,
211 INT_NEGATE_OVERFLOW (INT_MIN), INT_MIN);
212 CHECK_SBINOP (*, MULTIPLY, LONG_MIN / INT_MAX, (long int) INT_MAX,
213 long int, false, LONG_MIN - LONG_MIN % INT_MAX);
214
215 CHECK_BINOP (/, DIVIDE, INT_MIN, -1, int,
216 INT_NEGATE_OVERFLOW (INT_MIN), INT_MIN);
217 CHECK_BINOP (/, DIVIDE, INT_MAX, 1, int, false, INT_MAX);
218 CHECK_BINOP (/, DIVIDE, (unsigned int) INT_MIN, -1u, unsigned int,
219 false, INT_MIN / -1u);
220
221 CHECK_BINOP (%, REMAINDER, INT_MIN, -1, int, INT_NEGATE_OVERFLOW (INT_MIN), 0);
222 CHECK_BINOP (%, REMAINDER, INT_MAX, 1, int, false, 0);
223 CHECK_BINOP (%, REMAINDER, (unsigned int) INT_MIN, -1u, unsigned int,
224 false, INT_MIN % -1u);
225
226 CHECK_BINOP (<<, LEFT_SHIFT, UINT_MAX, 1, unsigned int, true, UINT_MAX << 1);
227 CHECK_BINOP (<<, LEFT_SHIFT, UINT_MAX / 2 + 1, 1, unsigned int, true,
228 (UINT_MAX / 2 + 1) << 1);
229 CHECK_BINOP (<<, LEFT_SHIFT, UINT_MAX / 2, 1, unsigned int, false,
230 (UINT_MAX / 2) << 1);
231
232 /* INT_<op>_OVERFLOW and INT_<op>_WRAPV with mixed types. */
233 #define CHECK_SUM(a, b, t, v, vres) \
234 CHECK_SUM1(a, b, t, v, vres); \
235 CHECK_SUM1(b, a, t, v, vres)
236 #define CHECK_SSUM(a, b, t, v, vres) \
237 CHECK_SSUM1(a, b, t, v, vres); \
238 CHECK_SSUM1(b, a, t, v, vres)
239 #define CHECK_SUM1(a, b, t, v, vres) \
240 VERIFY (INT_ADD_OVERFLOW (a, b) == (v))
241 #define CHECK_SSUM1(a, b, t, v, vres) \
242 CHECK_SUM1(a, b, t, v, vres); \
243 { \
244 t result; \
245 ASSERT (INT_ADD_WRAPV (a, b, &result) == (v)); \
246 ASSERT (result == ((v) ? (vres) : ((a) + (b)))); \
247 }
248 CHECK_SSUM (-1, LONG_MIN, long int, true, LONG_MAX);
249 CHECK_SUM (-1, UINT_MAX, unsigned int, false, DONTCARE);
250 CHECK_SSUM (-1L, INT_MIN, long int, INT_MIN == LONG_MIN,
251 INT_MIN == LONG_MIN ? INT_MAX : DONTCARE);
252 CHECK_SUM (0u, -1, unsigned int, true, 0u + -1);
253 CHECK_SUM (0u, 0, unsigned int, false, DONTCARE);
254 CHECK_SUM (0u, 1, unsigned int, false, DONTCARE);
255 CHECK_SSUM (1, LONG_MAX, long int, true, LONG_MIN);
256 CHECK_SUM (1, UINT_MAX, unsigned int, true, 0u);
257 CHECK_SSUM (1L, INT_MAX, long int, INT_MAX == LONG_MAX,
258 INT_MAX == LONG_MAX ? INT_MIN : DONTCARE);
259 CHECK_SUM (1u, INT_MAX, unsigned int, INT_MAX == UINT_MAX, 1u + INT_MAX);
260 CHECK_SUM (1u, INT_MIN, unsigned int, true, 1u + INT_MIN);
261 {
262 long int result;
263 ASSERT (INT_ADD_WRAPV (1, INT_MAX, &result) == (INT_MAX == LONG_MAX));
264 ASSERT (INT_ADD_WRAPV (-1, INT_MIN, &result) == (INT_MIN == LONG_MIN));
265 }
266
267 #define CHECK_DIFFERENCE(a, b, t, v, vres) \
268 VERIFY (INT_SUBTRACT_OVERFLOW (a, b) == (v))
269 #define CHECK_SDIFFERENCE(a, b, t, v, vres) \
270 CHECK_DIFFERENCE(a, b, t, v, vres); \
271 { \
272 t result; \
273 ASSERT (INT_SUBTRACT_WRAPV (a, b, &result) == (v)); \
274 ASSERT (result == ((v) ? (vres) : ((a) - (b)))); \
275 }
276 CHECK_DIFFERENCE (INT_MAX, 1u, unsigned int, UINT_MAX < INT_MAX - 1,
277 INT_MAX - 1u);
278 CHECK_DIFFERENCE (UINT_MAX, 1, unsigned int, false, UINT_MAX - 1);
279 CHECK_DIFFERENCE (0u, -1, unsigned int, false, 0u - -1);
280 CHECK_DIFFERENCE (UINT_MAX, -1, unsigned int, true, UINT_MAX - -1);
281 CHECK_DIFFERENCE (INT_MIN, 1u, unsigned int, true, INT_MIN - 1u);
282 CHECK_DIFFERENCE (-1, 0u, unsigned int, true, -1 - 0u);
283 CHECK_SDIFFERENCE (-1, INT_MIN, int, false, -1 - INT_MIN);
284 CHECK_SDIFFERENCE (-1, INT_MAX, int, false, -1 - INT_MAX);
285 CHECK_SDIFFERENCE (0, INT_MIN, int, INT_MIN < -INT_MAX, INT_MIN);
286 CHECK_SDIFFERENCE (0, INT_MAX, int, false, 0 - INT_MAX);
287 {
288 long int result;
289 ASSERT (INT_SUBTRACT_WRAPV (INT_MAX, -1, &result) == (INT_MAX == LONG_MAX));
290 ASSERT (INT_SUBTRACT_WRAPV (INT_MIN, 1, &result) == (INT_MAX == LONG_MAX));
291 }
292
293 #define CHECK_PRODUCT(a, b, t, v, vres) \
294 CHECK_PRODUCT1(a, b, t, v, vres); \
295 CHECK_PRODUCT1(b, a, t, v, vres)
296 #define CHECK_SPRODUCT(a, b, t, v, vres) \
297 CHECK_SPRODUCT1(a, b, t, v, vres); \
298 CHECK_SPRODUCT1(b, a, t, v, vres)
299 #define CHECK_PRODUCT1(a, b, t, v, vres) \
300 VERIFY (INT_MULTIPLY_OVERFLOW (a, b) == (v))
301 #define CHECK_SPRODUCT1(a, b, t, v, vres) \
302 CHECK_PRODUCT1(a, b, t, v, vres); \
303 { \
304 t result; \
305 ASSERT (INT_MULTIPLY_WRAPV (a, b, &result) == (v)); \
306 ASSERT (result == ((v) ? (vres) : ((a) * (b)))); \
307 }
308 CHECK_PRODUCT (-1, 1u, unsigned int, true, -1 * 1u);
309 CHECK_SPRODUCT (-1, INT_MIN, int, INT_NEGATE_OVERFLOW (INT_MIN), INT_MIN);
310 CHECK_PRODUCT (-1, UINT_MAX, unsigned int, true, -1 * UINT_MAX);
311 CHECK_SPRODUCT (-32768, LONG_MAX / -32768 - 1, long int, true, LONG_MIN);
312 CHECK_SPRODUCT (-12345, LONG_MAX / -12345, long int, false, DONTCARE);
313 CHECK_SPRODUCT (0, -1, int, false, DONTCARE);
314 CHECK_SPRODUCT (0, 0, int, false, DONTCARE);
315 CHECK_PRODUCT (0, 0u, unsigned int, false, DONTCARE);
316 CHECK_SPRODUCT (0, 1, int, false, DONTCARE);
317 CHECK_SPRODUCT (0, INT_MAX, int, false, DONTCARE);
318 CHECK_SPRODUCT (0, INT_MIN, int, false, DONTCARE);
319 CHECK_PRODUCT (0, UINT_MAX, unsigned int, false, DONTCARE);
320 CHECK_PRODUCT (0u, -1, unsigned int, false, DONTCARE);
321 CHECK_PRODUCT (0u, 0, unsigned int, false, DONTCARE);
322 CHECK_PRODUCT (0u, 0u, unsigned int, false, DONTCARE);
323 CHECK_PRODUCT (0u, 1, unsigned int, false, DONTCARE);
324 CHECK_PRODUCT (0u, INT_MAX, unsigned int, false, DONTCARE);
325 CHECK_PRODUCT (0u, INT_MIN, unsigned int, false, DONTCARE);
326 CHECK_PRODUCT (0u, UINT_MAX, unsigned int, false, DONTCARE);
327 CHECK_SPRODUCT (1, INT_MAX, int, false, DONTCARE);
328 CHECK_SPRODUCT (1, INT_MIN, int, false, DONTCARE);
329 CHECK_PRODUCT (1, UINT_MAX, unsigned int, false, DONTCARE);
330 CHECK_PRODUCT (1u, INT_MIN, unsigned int, true, 1u * INT_MIN);
331 CHECK_PRODUCT (1u, INT_MAX, unsigned int, UINT_MAX < INT_MAX, 1u * INT_MAX);
332 CHECK_PRODUCT (INT_MAX, UINT_MAX, unsigned int, true, INT_MAX * UINT_MAX);
333 CHECK_PRODUCT (INT_MAX, ULONG_MAX, unsigned long int, true,
334 INT_MAX * ULONG_MAX);
335 CHECK_SPRODUCT (INT_MIN, LONG_MAX / INT_MIN - 1, long int, true, LONG_MIN);
336 CHECK_SPRODUCT (INT_MIN, LONG_MAX / INT_MIN, long int, false, DONTCARE);
337 CHECK_PRODUCT (INT_MIN, UINT_MAX, unsigned int, true, INT_MIN * UINT_MAX);
338 CHECK_PRODUCT (INT_MIN, ULONG_MAX, unsigned long int, true,
339 INT_MIN * ULONG_MAX);
340 {
341 long int result;
342 ASSERT (INT_MULTIPLY_WRAPV (INT_MAX, INT_MAX, &result)
343 == (LONG_MAX / INT_MAX < INT_MAX));
344 ASSERT (INT_MULTIPLY_WRAPV (INT_MAX, INT_MAX, &result)
345 || result == INT_MAX * (long int) INT_MAX);
346 ASSERT (INT_MULTIPLY_WRAPV (INT_MIN, INT_MIN, &result)
347 || result == INT_MIN * (long int) INT_MIN);
348 }
349
350 # ifdef LLONG_MAX
351 {
352 long long int result;
353 ASSERT (INT_MULTIPLY_WRAPV (LONG_MAX, LONG_MAX, &result)
354 == (LLONG_MAX / LONG_MAX < LONG_MAX));
355 ASSERT (INT_MULTIPLY_WRAPV (LONG_MAX, LONG_MAX, &result)
356 || result == LONG_MAX * (long long int) LONG_MAX);
357 ASSERT (INT_MULTIPLY_WRAPV (LONG_MIN, LONG_MIN, &result)
358 || result == LONG_MIN * (long long int) LONG_MIN);
359 }
360 # endif
361
362 #define CHECK_QUOTIENT(a, b, v) VERIFY (INT_DIVIDE_OVERFLOW (a, b) == (v))
363
364 CHECK_QUOTIENT (INT_MIN, -1L, INT_MIN == LONG_MIN);
365 CHECK_QUOTIENT (INT_MIN, UINT_MAX, false);
366 CHECK_QUOTIENT (INTMAX_MIN, UINTMAX_MAX, false);
367 CHECK_QUOTIENT (INTMAX_MIN, UINT_MAX, false);
368 CHECK_QUOTIENT (-11, 10u, true);
369 CHECK_QUOTIENT (-10, 10u, true);
370 CHECK_QUOTIENT (-9, 10u, false);
371 CHECK_QUOTIENT (11u, -10, true);
372 CHECK_QUOTIENT (10u, -10, true);
373 CHECK_QUOTIENT (9u, -10, false);
374
375 #define CHECK_REMAINDER(a, b, v) VERIFY (INT_REMAINDER_OVERFLOW (a, b) == (v))
376
377 CHECK_REMAINDER (INT_MIN, -1L, INT_MIN == LONG_MIN);
378 CHECK_REMAINDER (-1, UINT_MAX, true);
379 CHECK_REMAINDER ((intmax_t) -1, UINTMAX_MAX, true);
380 CHECK_REMAINDER (INTMAX_MIN, UINT_MAX,
381 (INTMAX_MAX < UINT_MAX
382 && - (unsigned int) INTMAX_MIN % UINT_MAX != 0));
383 CHECK_REMAINDER (INT_MIN, ULONG_MAX, INT_MIN % ULONG_MAX != 1);
384 CHECK_REMAINDER (1u, -1, false);
385 CHECK_REMAINDER (37*39u, -39, false);
386 CHECK_REMAINDER (37*39u + 1, -39, true);
387 CHECK_REMAINDER (37*39u - 1, -39, true);
388 CHECK_REMAINDER (LONG_MAX, -INT_MAX, false);
389
390 return 0;
391 }
392