tstRand.cpp@ 106579

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1	/* $Id: tstRand.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* IPRT - Testcase for the RTRand API.
4	*/
5
6	/*
7	* Copyright (C) 2008-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#include <iprt/rand.h>
42	#include <iprt/errcore.h>
43	#include <iprt/stream.h>
44	#include <iprt/initterm.h>
45	#include <iprt/string.h>
46	#include <iprt/assert.h>
47
48
49	/*********************************************************************************************************************************
50	* Structures and Typedefs *
51	*********************************************************************************************************************************/
52	typedef struct TSTMEMAUTOPTRSTRUCT
53	{
54	uint32_t a;
55	uint32_t b;
56	uint32_t c;
57	} TSTMEMAUTOPTRSTRUCT;
58
59
60	/*********************************************************************************************************************************
61	* Defined Constants And Macros *
62	*********************************************************************************************************************************/
63	#define CHECK_EXPR(expr) \
64	do { bool const f = !!(expr); if (RT_UNLIKELY(!f)) { RTPrintf("tstRand(%d): %s!\n", __LINE__, #expr); g_cErrors++; } } while (0)
65	#define CHECK_EXPR_MSG(expr, msg) \
66	do { \
67	bool const f = !!(expr); \
68	if (RT_UNLIKELY(!f)) { \
69	RTPrintf("tstRand(%d): %s!\n", __LINE__, #expr); \
70	RTPrintf("tstRand: "); \
71	RTPrintf msg; \
72	if (++g_cErrors > 25) return 1; \
73	} \
74	} while (0)
75
76
77	#define TST_RAND_SAMPLE_RANGES 16
78
79
80	/*********************************************************************************************************************************
81	* Global Variables *
82	*********************************************************************************************************************************/
83	static unsigned g_cErrors = 0;
84
85
86	static void tstRandCheckDist(uint32_t *pacHits, unsigned iTest)
87	{
88	RTPrintf("tstRand:");
89	uint32_t iMin = UINT32_MAX;
90	uint32_t iMax = 0;
91	uint32_t iAvg = 0;
92	for (unsigned iRange = 0; iRange < TST_RAND_SAMPLE_RANGES; iRange++)
93	{
94	RTPrintf(" %04RX32", pacHits[iRange]);
95	if (iMax < pacHits[iRange])
96	iMax = pacHits[iRange];
97	if (iMin > pacHits[iRange])
98	iMin = pacHits[iRange];
99	iAvg += pacHits[iRange];
100	}
101	iAvg /= TST_RAND_SAMPLE_RANGES;
102	RTPrintf(" min=%RX32 (%%%d) max=%RX32 (%%%d) calc avg=%RX32 [test=%d]\n",
103	iMin, (iAvg - iMin) * 100 / iAvg, iMax,
104	(iMax - iAvg) * 100 / iAvg,
105	iAvg,
106	iTest);
107	CHECK_EXPR(iMin >= iAvg - iAvg / 4);
108	CHECK_EXPR(iMax <= iAvg + iAvg / 4);
109	}
110
111
112	static int tstRandAdv(RTRAND hRand)
113	{
114	/*
115	* Test distribution.
116	*/
117	#if 1
118	/* unsigned 32-bit */
119	static const struct
120	{
121	uint32_t u32First;
122	uint32_t u32Last;
123	} s_aU32Tests[] =
124	{
125	{ 0, UINT32_MAX },
126	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
127	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
128	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
129	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
130	{ 0, UINT32_MAX / 2 },
131	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
132	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
133	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
134	};
135	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU32Tests); iTest++)
136	{
137	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
138	uint32_t const uFirst = s_aU32Tests[iTest].u32First;
139	uint32_t const uLast = s_aU32Tests[iTest].u32Last;
140	uint32_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
141	uint32_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
142	RTPrintf("tstRand: TESTING RTRandAdvU32Ex(,%#RX32, %#RX32) distribution... [div=%#RX32 range=%#RX32]\n", uFirst, uLast, uDivisor, uRange);
143	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
144	{
145	uint32_t uRand = RTRandAdvU32Ex(hRand, uFirst, uLast);
146	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX32 %#RX32\n", uRand, uFirst));
147	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX32 %#RX32\n", uRand, uLast));
148	uint32_t off = uRand - uFirst;
149	acHits[off / uDivisor]++;
150	}
151	tstRandCheckDist(acHits, iTest);
152	}
153	#endif
154
155	#if 1
156	/* unsigned 64-bit */
157	static const struct
158	{
159	uint64_t u64First;
160	uint64_t u64Last;
161	} s_aU64Tests[] =
162	{
163	{ 0, UINT64_MAX },
164	{ 0, UINT64_MAX / 2 + UINT64_MAX / 4 },
165	{ 0, UINT64_MAX / 2 + UINT64_MAX / 8 },
166	{ 0, UINT64_MAX / 2 + UINT64_MAX / 16 },
167	{ 0, UINT64_MAX / 2 + UINT64_MAX / 64 },
168	{ 0, UINT64_MAX / 2 },
169	{ UINT64_MAX / 4, UINT64_MAX / 4 * 3 },
170	{ 0, UINT32_MAX },
171	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
172	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
173	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
174	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
175	{ 0, UINT32_MAX / 2 },
176	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
177	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
178	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
179	};
180	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU64Tests); iTest++)
181	{
182	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
183	uint64_t const uFirst = s_aU64Tests[iTest].u64First;
184	uint64_t const uLast = s_aU64Tests[iTest].u64Last;
185	uint64_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
186	uint64_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
187	RTPrintf("tstRand: TESTING RTRandAdvU64Ex(,%#RX64, %#RX64) distribution... [div=%#RX64 range=%#RX64]\n", uFirst, uLast, uDivisor, uRange);
188	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
189	{
190	uint64_t uRand = RTRandAdvU64Ex(hRand, uFirst, uLast);
191	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX64 %#RX64\n", uRand, uFirst));
192	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX64 %#RX64\n", uRand, uLast));
193	uint64_t off = uRand - uFirst;
194	acHits[off / uDivisor]++;
195	}
196	tstRandCheckDist(acHits, iTest);
197	}
198	#endif
199
200	#if 1
201	/* signed 32-bit */
202	static const struct
203	{
204	int32_t i32First;
205	int32_t i32Last;
206	} s_aS32Tests[] =
207	{
208	{ -429496729, 429496729 },
209	{ INT32_MIN, INT32_MAX },
210	{ INT32_MIN, INT32_MAX / 2 },
211	{ -0x20000000, INT32_MAX },
212	{ -0x10000000, INT32_MAX },
213	{ -0x08000000, INT32_MAX },
214	{ -0x00800000, INT32_MAX },
215	{ -0x00080000, INT32_MAX },
216	{ -0x00008000, INT32_MAX },
217	{ -0x00000800, INT32_MAX },
218	{ 2, INT32_MAX / 2 },
219	{ 4000000, INT32_MAX / 2 },
220	{ -4000000, INT32_MAX / 2 },
221	{ INT32_MIN / 2, INT32_MAX / 2 },
222	{ INT32_MIN / 3, INT32_MAX / 2 },
223	{ INT32_MIN / 3, INT32_MAX / 3 },
224	{ INT32_MIN / 3, INT32_MAX / 4 },
225	{ INT32_MIN / 4, INT32_MAX / 4 },
226	{ INT32_MIN / 5, INT32_MAX / 5 },
227	{ INT32_MIN / 6, INT32_MAX / 6 },
228	{ INT32_MIN / 7, INT32_MAX / 6 },
229	{ INT32_MIN / 7, INT32_MAX / 7 },
230	{ INT32_MIN / 7, INT32_MAX / 8 },
231	{ INT32_MIN / 8, INT32_MAX / 8 },
232	{ INT32_MIN / 9, INT32_MAX / 9 },
233	{ INT32_MIN / 9, INT32_MAX / 12 },
234	{ INT32_MIN / 12, INT32_MAX / 12 },
235	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
236	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 },
237	};
238	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS32Tests); iTest++)
239	{
240	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
241	int32_t const iFirst = s_aS32Tests[iTest].i32First;
242	int32_t const iLast = s_aS32Tests[iTest].i32Last;
243	uint32_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
244	uint32_t const uDivisor = (uRange ? uRange : UINT32_MAX) / TST_RAND_SAMPLE_RANGES + 1;
245	RTPrintf("tstRand: TESTING RTRandAdvS32Ex(,%#RI32, %#RI32) distribution... [div=%#RX32 range=%#RX32]\n", iFirst, iLast, uDivisor, uRange);
246	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
247	{
248	int32_t iRand = RTRandAdvS32Ex(hRand, iFirst, iLast);
249	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI32 %#RI32\n", iRand, iFirst));
250	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI32 %#RI32\n", iRand, iLast));
251	uint32_t off = iRand - iFirst;
252	acHits[off / uDivisor]++;
253	}
254	tstRandCheckDist(acHits, iTest);
255	}
256	#endif
257
258	#if 1
259	/* signed 64-bit */
260	static const struct
261	{
262	int64_t i64First;
263	int64_t i64Last;
264	} s_aS64Tests[] =
265	{
266	{ INT64_MIN, INT64_MAX },
267	{ INT64_MIN, INT64_MAX / 2 },
268	{ INT64_MIN / 2, INT64_MAX / 2 },
269	{ INT64_MIN / 2 + INT64_MIN / 4, INT64_MAX / 2 },
270	{ INT64_MIN / 2 + INT64_MIN / 8, INT64_MAX / 2 },
271	{ INT64_MIN / 2 + INT64_MIN / 16, INT64_MAX / 2 },
272	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 },
273	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 + INT64_MAX / 64 },
274	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 64 },
275	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 8 },
276	{ INT64_MIN / 2, INT64_MAX / 2 - INT64_MAX / 8 },
277	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 4 },
278	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 8 },
279	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 - INT64_MAX / 8 },
280	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 8 },
281	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 16 },
282	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 16 },
283	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 32 },
284	{ INT64_MIN / 2 - INT64_MIN / 64, INT64_MAX / 2 - INT64_MAX / 64 },
285	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 },
286	{ INT64_MIN / 4, INT64_MAX / 4 },
287	{ INT64_MIN / 5, INT64_MAX / 5 },
288	{ INT64_MIN / 6, INT64_MAX / 6 },
289	{ INT64_MIN / 7, INT64_MAX / 7 },
290	{ INT64_MIN / 8, INT64_MAX / 8 },
291	{ INT32_MIN, INT32_MAX },
292	{ INT32_MIN, INT32_MAX / 2 },
293	{ -0x20000000, INT32_MAX },
294	{ -0x10000000, INT32_MAX },
295	{ -0x7f000000, INT32_MAX },
296	{ -0x08000000, INT32_MAX },
297	{ -0x00800000, INT32_MAX },
298	{ -0x00080000, INT32_MAX },
299	{ -0x00008000, INT32_MAX },
300	{ 2, INT32_MAX / 2 },
301	{ 4000000, INT32_MAX / 2 },
302	{ -4000000, INT32_MAX / 2 },
303	{ INT32_MIN / 2, INT32_MAX / 2 },
304	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
305	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 }
306	};
307	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS64Tests); iTest++)
308	{
309	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
310	int64_t const iFirst = s_aS64Tests[iTest].i64First;
311	int64_t const iLast = s_aS64Tests[iTest].i64Last;
312	uint64_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
313	uint64_t const uDivisor = (uRange ? uRange : UINT64_MAX) / TST_RAND_SAMPLE_RANGES + 1;
314	RTPrintf("tstRand: TESTING RTRandAdvS64Ex(,%#RI64, %#RI64) distribution... [div=%#RX64 range=%#016RX64]\n", iFirst, iLast, uDivisor, uRange);
315	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
316	{
317	int64_t iRand = RTRandAdvS64Ex(hRand, iFirst, iLast);
318	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI64 %#RI64\n", iRand, iFirst));
319	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI64 %#RI64\n", iRand, iLast));
320	uint64_t off = iRand - iFirst;
321	acHits[off / uDivisor]++;
322	}
323	tstRandCheckDist(acHits, iTest);
324	}
325	#endif
326
327	/*
328	* Test saving and restoring the state.
329	*/
330	RTPrintf("tstRand: TESTING RTRandAdvSave/RestoreSave\n");
331	char szState[256];
332	size_t cbState = sizeof(szState);
333	int rc = RTRandAdvSaveState(hRand, szState, &cbState);
334	if (rc != VERR_NOT_SUPPORTED)
335	{
336	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvSaveState(%p,,256) -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
337	uint32_t const u32A1 = RTRandAdvU32(hRand);
338	uint32_t const u32B1 = RTRandAdvU32(hRand);
339	RTPrintf("tstRand: state:\"%s\" A=%RX32 B=%RX32\n", szState, u32A1, u32B1);
340
341	rc = RTRandAdvRestoreState(hRand, szState);
342	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvRestoreState(%p,\"%s\") -> %Rrc (%d)\n", (uintptr_t)hRand, szState, rc, rc));
343	uint32_t const u32A2 = RTRandAdvU32(hRand);
344	uint32_t const u32B2 = RTRandAdvU32(hRand);
345	CHECK_EXPR_MSG(u32A1 == u32A2, ("u32A1=%RX32 u32A2=%RX32\n", u32A1, u32A2));
346	CHECK_EXPR_MSG(u32B1 == u32B2, ("u32B1=%RX32 u32B2=%RX32\n", u32B1, u32B2));
347	}
348	else
349	{
350	szState[0] = '\0';
351	rc = RTRandAdvRestoreState(hRand, szState);
352	CHECK_EXPR_MSG(rc == VERR_NOT_SUPPORTED, ("RTRandAdvRestoreState(%p,\"\") -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
353	}
354
355
356	/*
357	* Destroy it.
358	*/
359	rc = RTRandAdvDestroy(hRand);
360	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvDestroy(%p) -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
361
362	return 0;
363	}
364
365
366
367	int main()
368	{
369	RTR3InitExeNoArguments(0);
370	RTPrintf("tstRand: TESTING...\n");
371
372	/*
373	* Do some smoke tests first?
374	*/
375	/** @todo RTRand smoke testing. */
376
377	#if 1
378	/*
379	* Test distribution.
380	*/
381	#if 1
382	/* unsigned 32-bit */
383	static const struct
384	{
385	uint32_t u32First;
386	uint32_t u32Last;
387	} s_aU32Tests[] =
388	{
389	{ 0, UINT32_MAX },
390	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
391	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
392	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
393	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
394	{ 0, UINT32_MAX / 2 },
395	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
396	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
397	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
398	};
399	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU32Tests); iTest++)
400	{
401	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
402	uint32_t const uFirst = s_aU32Tests[iTest].u32First;
403	uint32_t const uLast = s_aU32Tests[iTest].u32Last;
404	uint32_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
405	uint32_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
406	RTPrintf("tstRand: TESTING RTRandU32Ex(%#RX32, %#RX32) distribution... [div=%#RX32 range=%#RX32]\n", uFirst, uLast, uDivisor, uRange);
407	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
408	{
409	uint32_t uRand = RTRandU32Ex(uFirst, uLast);
410	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX32 %#RX32\n", uRand, uFirst));
411	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX32 %#RX32\n", uRand, uLast));
412	uint32_t off = uRand - uFirst;
413	acHits[off / uDivisor]++;
414	}
415	tstRandCheckDist(acHits, iTest);
416	}
417	#endif
418
419	#if 1
420	/* unsigned 64-bit */
421	static const struct
422	{
423	uint64_t u64First;
424	uint64_t u64Last;
425	} s_aU64Tests[] =
426	{
427	{ 0, UINT64_MAX },
428	{ 0, UINT64_MAX / 2 + UINT64_MAX / 4 },
429	{ 0, UINT64_MAX / 2 + UINT64_MAX / 8 },
430	{ 0, UINT64_MAX / 2 + UINT64_MAX / 16 },
431	{ 0, UINT64_MAX / 2 + UINT64_MAX / 64 },
432	{ 0, UINT64_MAX / 2 },
433	{ UINT64_MAX / 4, UINT64_MAX / 4 * 3 },
434	{ 0, UINT32_MAX },
435	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
436	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
437	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
438	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
439	{ 0, UINT32_MAX / 2 },
440	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
441	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
442	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
443	};
444	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU64Tests); iTest++)
445	{
446	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
447	uint64_t const uFirst = s_aU64Tests[iTest].u64First;
448	uint64_t const uLast = s_aU64Tests[iTest].u64Last;
449	uint64_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
450	uint64_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
451	RTPrintf("tstRand: TESTING RTRandU64Ex(%#RX64, %#RX64) distribution... [div=%#RX64 range=%#RX64]\n", uFirst, uLast, uDivisor, uRange);
452	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
453	{
454	uint64_t uRand = RTRandU64Ex(uFirst, uLast);
455	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX64 %#RX64\n", uRand, uFirst));
456	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX64 %#RX64\n", uRand, uLast));
457	uint64_t off = uRand - uFirst;
458	acHits[off / uDivisor]++;
459	}
460	tstRandCheckDist(acHits, iTest);
461	}
462	#endif
463
464	#if 1
465	/* signed 32-bit */
466	static const struct
467	{
468	int32_t i32First;
469	int32_t i32Last;
470	} s_aS32Tests[] =
471	{
472	{ -429496729, 429496729 },
473	{ INT32_MIN, INT32_MAX },
474	{ INT32_MIN, INT32_MAX / 2 },
475	{ -0x20000000, INT32_MAX },
476	{ -0x10000000, INT32_MAX },
477	{ -0x08000000, INT32_MAX },
478	{ -0x00800000, INT32_MAX },
479	{ -0x00080000, INT32_MAX },
480	{ -0x00008000, INT32_MAX },
481	{ -0x00000800, INT32_MAX },
482	{ 2, INT32_MAX / 2 },
483	{ 4000000, INT32_MAX / 2 },
484	{ -4000000, INT32_MAX / 2 },
485	{ INT32_MIN / 2, INT32_MAX / 2 },
486	{ INT32_MIN / 3, INT32_MAX / 2 },
487	{ INT32_MIN / 3, INT32_MAX / 3 },
488	{ INT32_MIN / 3, INT32_MAX / 4 },
489	{ INT32_MIN / 4, INT32_MAX / 4 },
490	{ INT32_MIN / 5, INT32_MAX / 5 },
491	{ INT32_MIN / 6, INT32_MAX / 6 },
492	{ INT32_MIN / 7, INT32_MAX / 6 },
493	{ INT32_MIN / 7, INT32_MAX / 7 },
494	{ INT32_MIN / 7, INT32_MAX / 8 },
495	{ INT32_MIN / 8, INT32_MAX / 8 },
496	{ INT32_MIN / 9, INT32_MAX / 9 },
497	{ INT32_MIN / 9, INT32_MAX / 12 },
498	{ INT32_MIN / 12, INT32_MAX / 12 },
499	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
500	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 },
501	};
502	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS32Tests); iTest++)
503	{
504	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
505	int32_t const iFirst = s_aS32Tests[iTest].i32First;
506	int32_t const iLast = s_aS32Tests[iTest].i32Last;
507	uint32_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
508	uint32_t const uDivisor = (uRange ? uRange : UINT32_MAX) / TST_RAND_SAMPLE_RANGES + 1;
509	RTPrintf("tstRand: TESTING RTRandS32Ex(%#RI32, %#RI32) distribution... [div=%#RX32 range=%#RX32]\n", iFirst, iLast, uDivisor, uRange);
510	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
511	{
512	int32_t iRand = RTRandS32Ex(iFirst, iLast);
513	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI32 %#RI32\n", iRand, iFirst));
514	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI32 %#RI32\n", iRand, iLast));
515	uint32_t off = iRand - iFirst;
516	acHits[off / uDivisor]++;
517	}
518	tstRandCheckDist(acHits, iTest);
519	}
520	#endif
521
522	#if 1
523	/* signed 64-bit */
524	static const struct
525	{
526	int64_t i64First;
527	int64_t i64Last;
528	} s_aS64Tests[] =
529	{
530	{ INT64_MIN, INT64_MAX },
531	{ INT64_MIN, INT64_MAX / 2 },
532	{ INT64_MIN / 2, INT64_MAX / 2 },
533	{ INT64_MIN / 2 + INT64_MIN / 4, INT64_MAX / 2 },
534	{ INT64_MIN / 2 + INT64_MIN / 8, INT64_MAX / 2 },
535	{ INT64_MIN / 2 + INT64_MIN / 16, INT64_MAX / 2 },
536	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 },
537	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 + INT64_MAX / 64 },
538	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 64 },
539	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 8 },
540	{ INT64_MIN / 2, INT64_MAX / 2 - INT64_MAX / 8 },
541	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 4 },
542	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 8 },
543	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 - INT64_MAX / 8 },
544	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 8 },
545	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 16 },
546	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 16 },
547	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 32 },
548	{ INT64_MIN / 2 - INT64_MIN / 64, INT64_MAX / 2 - INT64_MAX / 64 },
549	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 },
550	{ INT64_MIN / 4, INT64_MAX / 4 },
551	{ INT64_MIN / 5, INT64_MAX / 5 },
552	{ INT64_MIN / 6, INT64_MAX / 6 },
553	{ INT64_MIN / 7, INT64_MAX / 7 },
554	{ INT64_MIN / 8, INT64_MAX / 8 },
555	{ INT32_MIN, INT32_MAX },
556	{ INT32_MIN, INT32_MAX / 2 },
557	{ -0x20000000, INT32_MAX },
558	{ -0x10000000, INT32_MAX },
559	{ -0x7f000000, INT32_MAX },
560	{ -0x08000000, INT32_MAX },
561	{ -0x00800000, INT32_MAX },
562	{ -0x00080000, INT32_MAX },
563	{ -0x00008000, INT32_MAX },
564	{ 2, INT32_MAX / 2 },
565	{ 4000000, INT32_MAX / 2 },
566	{ -4000000, INT32_MAX / 2 },
567	{ INT32_MIN / 2, INT32_MAX / 2 },
568	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
569	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 }
570	};
571	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS64Tests); iTest++)
572	{
573	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
574	int64_t const iFirst = s_aS64Tests[iTest].i64First;
575	int64_t const iLast = s_aS64Tests[iTest].i64Last;
576	uint64_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
577	uint64_t const uDivisor = (uRange ? uRange : UINT64_MAX) / TST_RAND_SAMPLE_RANGES + 1;
578	RTPrintf("tstRand: TESTING RTRandS64Ex(%#RI64, %#RI64) distribution... [div=%#RX64 range=%#016RX64]\n", iFirst, iLast, uDivisor, uRange);
579	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
580	{
581	int64_t iRand = RTRandS64Ex(iFirst, iLast);
582	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI64 %#RI64\n", iRand, iFirst));
583	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI64 %#RI64\n", iRand, iLast));
584	uint64_t off = iRand - iFirst;
585	acHits[off / uDivisor]++;
586	}
587	tstRandCheckDist(acHits, iTest);
588	}
589	#endif
590	#endif /* Testing RTRand */
591
592	#if 1
593	/*
594	* Test the various random generators.
595	*/
596	RTPrintf("tstRand: TESTING RTRandAdvCreateParkerMiller\n");
597	RTRAND hRand;
598	int rc = RTRandAdvCreateParkMiller(&hRand);
599	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("rc=%Rrc\n", rc));
600	if (RT_SUCCESS(rc))
601	if (tstRandAdv(hRand))
602	return 1;
603
604	#endif /* Testing RTRandAdv */
605
606	/*
607	* Summary.
608	*/
609	if (!g_cErrors)
610	RTPrintf("tstRand: SUCCESS\n");
611	else
612	RTPrintf("tstRand: FAILED - %d errors\n", g_cErrors);
613	return !!g_cErrors;
614	}
615

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source: vbox/trunk/src/VBox/Runtime/testcase/tstRand.cpp@ 106579

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