tstRand.cpp@ 91886

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1	/* $Id: tstRand.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* IPRT - Testcase for the RTRand API.
4	*/
5
6	/*
7	* Copyright (C) 2008-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include <iprt/rand.h>
32	#include <iprt/errcore.h>
33	#include <iprt/stream.h>
34	#include <iprt/initterm.h>
35	#include <iprt/string.h>
36	#include <iprt/assert.h>
37
38
39	/*********************************************************************************************************************************
40	* Structures and Typedefs *
41	*********************************************************************************************************************************/
42	typedef struct TSTMEMAUTOPTRSTRUCT
43	{
44	uint32_t a;
45	uint32_t b;
46	uint32_t c;
47	} TSTMEMAUTOPTRSTRUCT;
48
49
50	/*********************************************************************************************************************************
51	* Defined Constants And Macros *
52	*********************************************************************************************************************************/
53	#define CHECK_EXPR(expr) \
54	do { bool const f = !!(expr); if (RT_UNLIKELY(!f)) { RTPrintf("tstRand(%d): %s!\n", __LINE__, #expr); g_cErrors++; } } while (0)
55	#define CHECK_EXPR_MSG(expr, msg) \
56	do { \
57	bool const f = !!(expr); \
58	if (RT_UNLIKELY(!f)) { \
59	RTPrintf("tstRand(%d): %s!\n", __LINE__, #expr); \
60	RTPrintf("tstRand: "); \
61	RTPrintf msg; \
62	if (++g_cErrors > 25) return 1; \
63	} \
64	} while (0)
65
66
67	#define TST_RAND_SAMPLE_RANGES 16
68
69
70	/*********************************************************************************************************************************
71	* Global Variables *
72	*********************************************************************************************************************************/
73	static unsigned g_cErrors = 0;
74
75
76	static void tstRandCheckDist(uint32_t *pacHits, unsigned iTest)
77	{
78	RTPrintf("tstRand:");
79	uint32_t iMin = UINT32_MAX;
80	uint32_t iMax = 0;
81	uint32_t iAvg = 0;
82	for (unsigned iRange = 0; iRange < TST_RAND_SAMPLE_RANGES; iRange++)
83	{
84	RTPrintf(" %04RX32", pacHits[iRange]);
85	if (iMax < pacHits[iRange])
86	iMax = pacHits[iRange];
87	if (iMin > pacHits[iRange])
88	iMin = pacHits[iRange];
89	iAvg += pacHits[iRange];
90	}
91	iAvg /= TST_RAND_SAMPLE_RANGES;
92	RTPrintf(" min=%RX32 (%%%d) max=%RX32 (%%%d) calc avg=%RX32 [test=%d]\n",
93	iMin, (iAvg - iMin) * 100 / iAvg, iMax,
94	(iMax - iAvg) * 100 / iAvg,
95	iAvg,
96	iTest);
97	CHECK_EXPR(iMin >= iAvg - iAvg / 4);
98	CHECK_EXPR(iMax <= iAvg + iAvg / 4);
99	}
100
101
102	static int tstRandAdv(RTRAND hRand)
103	{
104	/*
105	* Test distribution.
106	*/
107	#if 1
108	/* unsigned 32-bit */
109	static const struct
110	{
111	uint32_t u32First;
112	uint32_t u32Last;
113	} s_aU32Tests[] =
114	{
115	{ 0, UINT32_MAX },
116	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
117	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
118	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
119	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
120	{ 0, UINT32_MAX / 2 },
121	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
122	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
123	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
124	};
125	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU32Tests); iTest++)
126	{
127	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
128	uint32_t const uFirst = s_aU32Tests[iTest].u32First;
129	uint32_t const uLast = s_aU32Tests[iTest].u32Last;
130	uint32_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
131	uint32_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
132	RTPrintf("tstRand: TESTING RTRandAdvU32Ex(,%#RX32, %#RX32) distribution... [div=%#RX32 range=%#RX32]\n", uFirst, uLast, uDivisor, uRange);
133	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
134	{
135	uint32_t uRand = RTRandAdvU32Ex(hRand, uFirst, uLast);
136	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX32 %#RX32\n", uRand, uFirst));
137	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX32 %#RX32\n", uRand, uLast));
138	uint32_t off = uRand - uFirst;
139	acHits[off / uDivisor]++;
140	}
141	tstRandCheckDist(acHits, iTest);
142	}
143	#endif
144
145	#if 1
146	/* unsigned 64-bit */
147	static const struct
148	{
149	uint64_t u64First;
150	uint64_t u64Last;
151	} s_aU64Tests[] =
152	{
153	{ 0, UINT64_MAX },
154	{ 0, UINT64_MAX / 2 + UINT64_MAX / 4 },
155	{ 0, UINT64_MAX / 2 + UINT64_MAX / 8 },
156	{ 0, UINT64_MAX / 2 + UINT64_MAX / 16 },
157	{ 0, UINT64_MAX / 2 + UINT64_MAX / 64 },
158	{ 0, UINT64_MAX / 2 },
159	{ UINT64_MAX / 4, UINT64_MAX / 4 * 3 },
160	{ 0, UINT32_MAX },
161	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
162	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
163	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
164	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
165	{ 0, UINT32_MAX / 2 },
166	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
167	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
168	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
169	};
170	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU64Tests); iTest++)
171	{
172	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
173	uint64_t const uFirst = s_aU64Tests[iTest].u64First;
174	uint64_t const uLast = s_aU64Tests[iTest].u64Last;
175	uint64_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
176	uint64_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
177	RTPrintf("tstRand: TESTING RTRandAdvU64Ex(,%#RX64, %#RX64) distribution... [div=%#RX64 range=%#RX64]\n", uFirst, uLast, uDivisor, uRange);
178	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
179	{
180	uint64_t uRand = RTRandAdvU64Ex(hRand, uFirst, uLast);
181	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX64 %#RX64\n", uRand, uFirst));
182	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX64 %#RX64\n", uRand, uLast));
183	uint64_t off = uRand - uFirst;
184	acHits[off / uDivisor]++;
185	}
186	tstRandCheckDist(acHits, iTest);
187	}
188	#endif
189
190	#if 1
191	/* signed 32-bit */
192	static const struct
193	{
194	int32_t i32First;
195	int32_t i32Last;
196	} s_aS32Tests[] =
197	{
198	{ -429496729, 429496729 },
199	{ INT32_MIN, INT32_MAX },
200	{ INT32_MIN, INT32_MAX / 2 },
201	{ -0x20000000, INT32_MAX },
202	{ -0x10000000, INT32_MAX },
203	{ -0x08000000, INT32_MAX },
204	{ -0x00800000, INT32_MAX },
205	{ -0x00080000, INT32_MAX },
206	{ -0x00008000, INT32_MAX },
207	{ -0x00000800, INT32_MAX },
208	{ 2, INT32_MAX / 2 },
209	{ 4000000, INT32_MAX / 2 },
210	{ -4000000, INT32_MAX / 2 },
211	{ INT32_MIN / 2, INT32_MAX / 2 },
212	{ INT32_MIN / 3, INT32_MAX / 2 },
213	{ INT32_MIN / 3, INT32_MAX / 3 },
214	{ INT32_MIN / 3, INT32_MAX / 4 },
215	{ INT32_MIN / 4, INT32_MAX / 4 },
216	{ INT32_MIN / 5, INT32_MAX / 5 },
217	{ INT32_MIN / 6, INT32_MAX / 6 },
218	{ INT32_MIN / 7, INT32_MAX / 6 },
219	{ INT32_MIN / 7, INT32_MAX / 7 },
220	{ INT32_MIN / 7, INT32_MAX / 8 },
221	{ INT32_MIN / 8, INT32_MAX / 8 },
222	{ INT32_MIN / 9, INT32_MAX / 9 },
223	{ INT32_MIN / 9, INT32_MAX / 12 },
224	{ INT32_MIN / 12, INT32_MAX / 12 },
225	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
226	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 },
227	};
228	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS32Tests); iTest++)
229	{
230	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
231	int32_t const iFirst = s_aS32Tests[iTest].i32First;
232	int32_t const iLast = s_aS32Tests[iTest].i32Last;
233	uint32_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
234	uint32_t const uDivisor = (uRange ? uRange : UINT32_MAX) / TST_RAND_SAMPLE_RANGES + 1;
235	RTPrintf("tstRand: TESTING RTRandAdvS32Ex(,%#RI32, %#RI32) distribution... [div=%#RX32 range=%#RX32]\n", iFirst, iLast, uDivisor, uRange);
236	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
237	{
238	int32_t iRand = RTRandAdvS32Ex(hRand, iFirst, iLast);
239	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI32 %#RI32\n", iRand, iFirst));
240	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI32 %#RI32\n", iRand, iLast));
241	uint32_t off = iRand - iFirst;
242	acHits[off / uDivisor]++;
243	}
244	tstRandCheckDist(acHits, iTest);
245	}
246	#endif
247
248	#if 1
249	/* signed 64-bit */
250	static const struct
251	{
252	int64_t i64First;
253	int64_t i64Last;
254	} s_aS64Tests[] =
255	{
256	{ INT64_MIN, INT64_MAX },
257	{ INT64_MIN, INT64_MAX / 2 },
258	{ INT64_MIN / 2, INT64_MAX / 2 },
259	{ INT64_MIN / 2 + INT64_MIN / 4, INT64_MAX / 2 },
260	{ INT64_MIN / 2 + INT64_MIN / 8, INT64_MAX / 2 },
261	{ INT64_MIN / 2 + INT64_MIN / 16, INT64_MAX / 2 },
262	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 },
263	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 + INT64_MAX / 64 },
264	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 64 },
265	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 8 },
266	{ INT64_MIN / 2, INT64_MAX / 2 - INT64_MAX / 8 },
267	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 4 },
268	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 8 },
269	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 - INT64_MAX / 8 },
270	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 8 },
271	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 16 },
272	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 16 },
273	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 32 },
274	{ INT64_MIN / 2 - INT64_MIN / 64, INT64_MAX / 2 - INT64_MAX / 64 },
275	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 },
276	{ INT64_MIN / 4, INT64_MAX / 4 },
277	{ INT64_MIN / 5, INT64_MAX / 5 },
278	{ INT64_MIN / 6, INT64_MAX / 6 },
279	{ INT64_MIN / 7, INT64_MAX / 7 },
280	{ INT64_MIN / 8, INT64_MAX / 8 },
281	{ INT32_MIN, INT32_MAX },
282	{ INT32_MIN, INT32_MAX / 2 },
283	{ -0x20000000, INT32_MAX },
284	{ -0x10000000, INT32_MAX },
285	{ -0x7f000000, INT32_MAX },
286	{ -0x08000000, INT32_MAX },
287	{ -0x00800000, INT32_MAX },
288	{ -0x00080000, INT32_MAX },
289	{ -0x00008000, INT32_MAX },
290	{ 2, INT32_MAX / 2 },
291	{ 4000000, INT32_MAX / 2 },
292	{ -4000000, INT32_MAX / 2 },
293	{ INT32_MIN / 2, INT32_MAX / 2 },
294	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
295	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 }
296	};
297	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS64Tests); iTest++)
298	{
299	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
300	int64_t const iFirst = s_aS64Tests[iTest].i64First;
301	int64_t const iLast = s_aS64Tests[iTest].i64Last;
302	uint64_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
303	uint64_t const uDivisor = (uRange ? uRange : UINT64_MAX) / TST_RAND_SAMPLE_RANGES + 1;
304	RTPrintf("tstRand: TESTING RTRandAdvS64Ex(,%#RI64, %#RI64) distribution... [div=%#RX64 range=%#016RX64]\n", iFirst, iLast, uDivisor, uRange);
305	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
306	{
307	int64_t iRand = RTRandAdvS64Ex(hRand, iFirst, iLast);
308	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI64 %#RI64\n", iRand, iFirst));
309	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI64 %#RI64\n", iRand, iLast));
310	uint64_t off = iRand - iFirst;
311	acHits[off / uDivisor]++;
312	}
313	tstRandCheckDist(acHits, iTest);
314	}
315	#endif
316
317	/*
318	* Test saving and restoring the state.
319	*/
320	RTPrintf("tstRand: TESTING RTRandAdvSave/RestoreSave\n");
321	char szState[256];
322	size_t cbState = sizeof(szState);
323	int rc = RTRandAdvSaveState(hRand, szState, &cbState);
324	if (rc != VERR_NOT_SUPPORTED)
325	{
326	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvSaveState(%p,,256) -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
327	uint32_t const u32A1 = RTRandAdvU32(hRand);
328	uint32_t const u32B1 = RTRandAdvU32(hRand);
329	RTPrintf("tstRand: state:\"%s\" A=%RX32 B=%RX32\n", szState, u32A1, u32B1);
330
331	rc = RTRandAdvRestoreState(hRand, szState);
332	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvRestoreState(%p,\"%s\") -> %Rrc (%d)\n", (uintptr_t)hRand, szState, rc, rc));
333	uint32_t const u32A2 = RTRandAdvU32(hRand);
334	uint32_t const u32B2 = RTRandAdvU32(hRand);
335	CHECK_EXPR_MSG(u32A1 == u32A2, ("u32A1=%RX32 u32A2=%RX32\n", u32A1, u32A2));
336	CHECK_EXPR_MSG(u32B1 == u32B2, ("u32B1=%RX32 u32B2=%RX32\n", u32B1, u32B2));
337	}
338	else
339	{
340	szState[0] = '\0';
341	rc = RTRandAdvRestoreState(hRand, szState);
342	CHECK_EXPR_MSG(rc == VERR_NOT_SUPPORTED, ("RTRandAdvRestoreState(%p,\"\") -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
343	}
344
345
346	/*
347	* Destroy it.
348	*/
349	rc = RTRandAdvDestroy(hRand);
350	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvDestroy(%p) -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
351
352	return 0;
353	}
354
355
356
357	int main()
358	{
359	RTR3InitExeNoArguments(0);
360	RTPrintf("tstRand: TESTING...\n");
361
362	/*
363	* Do some smoke tests first?
364	*/
365	/** @todo RTRand smoke testing. */
366
367	#if 1
368	/*
369	* Test distribution.
370	*/
371	#if 1
372	/* unsigned 32-bit */
373	static const struct
374	{
375	uint32_t u32First;
376	uint32_t u32Last;
377	} s_aU32Tests[] =
378	{
379	{ 0, UINT32_MAX },
380	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
381	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
382	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
383	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
384	{ 0, UINT32_MAX / 2 },
385	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
386	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
387	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
388	};
389	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU32Tests); iTest++)
390	{
391	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
392	uint32_t const uFirst = s_aU32Tests[iTest].u32First;
393	uint32_t const uLast = s_aU32Tests[iTest].u32Last;
394	uint32_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
395	uint32_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
396	RTPrintf("tstRand: TESTING RTRandU32Ex(%#RX32, %#RX32) distribution... [div=%#RX32 range=%#RX32]\n", uFirst, uLast, uDivisor, uRange);
397	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
398	{
399	uint32_t uRand = RTRandU32Ex(uFirst, uLast);
400	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX32 %#RX32\n", uRand, uFirst));
401	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX32 %#RX32\n", uRand, uLast));
402	uint32_t off = uRand - uFirst;
403	acHits[off / uDivisor]++;
404	}
405	tstRandCheckDist(acHits, iTest);
406	}
407	#endif
408
409	#if 1
410	/* unsigned 64-bit */
411	static const struct
412	{
413	uint64_t u64First;
414	uint64_t u64Last;
415	} s_aU64Tests[] =
416	{
417	{ 0, UINT64_MAX },
418	{ 0, UINT64_MAX / 2 + UINT64_MAX / 4 },
419	{ 0, UINT64_MAX / 2 + UINT64_MAX / 8 },
420	{ 0, UINT64_MAX / 2 + UINT64_MAX / 16 },
421	{ 0, UINT64_MAX / 2 + UINT64_MAX / 64 },
422	{ 0, UINT64_MAX / 2 },
423	{ UINT64_MAX / 4, UINT64_MAX / 4 * 3 },
424	{ 0, UINT32_MAX },
425	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
426	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
427	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
428	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
429	{ 0, UINT32_MAX / 2 },
430	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
431	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
432	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
433	};
434	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU64Tests); iTest++)
435	{
436	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
437	uint64_t const uFirst = s_aU64Tests[iTest].u64First;
438	uint64_t const uLast = s_aU64Tests[iTest].u64Last;
439	uint64_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
440	uint64_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
441	RTPrintf("tstRand: TESTING RTRandU64Ex(%#RX64, %#RX64) distribution... [div=%#RX64 range=%#RX64]\n", uFirst, uLast, uDivisor, uRange);
442	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
443	{
444	uint64_t uRand = RTRandU64Ex(uFirst, uLast);
445	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX64 %#RX64\n", uRand, uFirst));
446	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX64 %#RX64\n", uRand, uLast));
447	uint64_t off = uRand - uFirst;
448	acHits[off / uDivisor]++;
449	}
450	tstRandCheckDist(acHits, iTest);
451	}
452	#endif
453
454	#if 1
455	/* signed 32-bit */
456	static const struct
457	{
458	int32_t i32First;
459	int32_t i32Last;
460	} s_aS32Tests[] =
461	{
462	{ -429496729, 429496729 },
463	{ INT32_MIN, INT32_MAX },
464	{ INT32_MIN, INT32_MAX / 2 },
465	{ -0x20000000, INT32_MAX },
466	{ -0x10000000, INT32_MAX },
467	{ -0x08000000, INT32_MAX },
468	{ -0x00800000, INT32_MAX },
469	{ -0x00080000, INT32_MAX },
470	{ -0x00008000, INT32_MAX },
471	{ -0x00000800, INT32_MAX },
472	{ 2, INT32_MAX / 2 },
473	{ 4000000, INT32_MAX / 2 },
474	{ -4000000, INT32_MAX / 2 },
475	{ INT32_MIN / 2, INT32_MAX / 2 },
476	{ INT32_MIN / 3, INT32_MAX / 2 },
477	{ INT32_MIN / 3, INT32_MAX / 3 },
478	{ INT32_MIN / 3, INT32_MAX / 4 },
479	{ INT32_MIN / 4, INT32_MAX / 4 },
480	{ INT32_MIN / 5, INT32_MAX / 5 },
481	{ INT32_MIN / 6, INT32_MAX / 6 },
482	{ INT32_MIN / 7, INT32_MAX / 6 },
483	{ INT32_MIN / 7, INT32_MAX / 7 },
484	{ INT32_MIN / 7, INT32_MAX / 8 },
485	{ INT32_MIN / 8, INT32_MAX / 8 },
486	{ INT32_MIN / 9, INT32_MAX / 9 },
487	{ INT32_MIN / 9, INT32_MAX / 12 },
488	{ INT32_MIN / 12, INT32_MAX / 12 },
489	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
490	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 },
491	};
492	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS32Tests); iTest++)
493	{
494	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
495	int32_t const iFirst = s_aS32Tests[iTest].i32First;
496	int32_t const iLast = s_aS32Tests[iTest].i32Last;
497	uint32_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
498	uint32_t const uDivisor = (uRange ? uRange : UINT32_MAX) / TST_RAND_SAMPLE_RANGES + 1;
499	RTPrintf("tstRand: TESTING RTRandS32Ex(%#RI32, %#RI32) distribution... [div=%#RX32 range=%#RX32]\n", iFirst, iLast, uDivisor, uRange);
500	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
501	{
502	int32_t iRand = RTRandS32Ex(iFirst, iLast);
503	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI32 %#RI32\n", iRand, iFirst));
504	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI32 %#RI32\n", iRand, iLast));
505	uint32_t off = iRand - iFirst;
506	acHits[off / uDivisor]++;
507	}
508	tstRandCheckDist(acHits, iTest);
509	}
510	#endif
511
512	#if 1
513	/* signed 64-bit */
514	static const struct
515	{
516	int64_t i64First;
517	int64_t i64Last;
518	} s_aS64Tests[] =
519	{
520	{ INT64_MIN, INT64_MAX },
521	{ INT64_MIN, INT64_MAX / 2 },
522	{ INT64_MIN / 2, INT64_MAX / 2 },
523	{ INT64_MIN / 2 + INT64_MIN / 4, INT64_MAX / 2 },
524	{ INT64_MIN / 2 + INT64_MIN / 8, INT64_MAX / 2 },
525	{ INT64_MIN / 2 + INT64_MIN / 16, INT64_MAX / 2 },
526	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 },
527	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 + INT64_MAX / 64 },
528	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 64 },
529	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 8 },
530	{ INT64_MIN / 2, INT64_MAX / 2 - INT64_MAX / 8 },
531	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 4 },
532	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 8 },
533	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 - INT64_MAX / 8 },
534	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 8 },
535	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 16 },
536	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 16 },
537	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 32 },
538	{ INT64_MIN / 2 - INT64_MIN / 64, INT64_MAX / 2 - INT64_MAX / 64 },
539	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 },
540	{ INT64_MIN / 4, INT64_MAX / 4 },
541	{ INT64_MIN / 5, INT64_MAX / 5 },
542	{ INT64_MIN / 6, INT64_MAX / 6 },
543	{ INT64_MIN / 7, INT64_MAX / 7 },
544	{ INT64_MIN / 8, INT64_MAX / 8 },
545	{ INT32_MIN, INT32_MAX },
546	{ INT32_MIN, INT32_MAX / 2 },
547	{ -0x20000000, INT32_MAX },
548	{ -0x10000000, INT32_MAX },
549	{ -0x7f000000, INT32_MAX },
550	{ -0x08000000, INT32_MAX },
551	{ -0x00800000, INT32_MAX },
552	{ -0x00080000, INT32_MAX },
553	{ -0x00008000, INT32_MAX },
554	{ 2, INT32_MAX / 2 },
555	{ 4000000, INT32_MAX / 2 },
556	{ -4000000, INT32_MAX / 2 },
557	{ INT32_MIN / 2, INT32_MAX / 2 },
558	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
559	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 }
560	};
561	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS64Tests); iTest++)
562	{
563	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
564	int64_t const iFirst = s_aS64Tests[iTest].i64First;
565	int64_t const iLast = s_aS64Tests[iTest].i64Last;
566	uint64_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
567	uint64_t const uDivisor = (uRange ? uRange : UINT64_MAX) / TST_RAND_SAMPLE_RANGES + 1;
568	RTPrintf("tstRand: TESTING RTRandS64Ex(%#RI64, %#RI64) distribution... [div=%#RX64 range=%#016RX64]\n", iFirst, iLast, uDivisor, uRange);
569	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
570	{
571	int64_t iRand = RTRandS64Ex(iFirst, iLast);
572	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI64 %#RI64\n", iRand, iFirst));
573	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI64 %#RI64\n", iRand, iLast));
574	uint64_t off = iRand - iFirst;
575	acHits[off / uDivisor]++;
576	}
577	tstRandCheckDist(acHits, iTest);
578	}
579	#endif
580	#endif /* Testing RTRand */
581
582	#if 1
583	/*
584	* Test the various random generators.
585	*/
586	RTPrintf("tstRand: TESTING RTRandAdvCreateParkerMiller\n");
587	RTRAND hRand;
588	int rc = RTRandAdvCreateParkMiller(&hRand);
589	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("rc=%Rrc\n", rc));
590	if (RT_SUCCESS(rc))
591	if (tstRandAdv(hRand))
592	return 1;
593
594	#endif /* Testing RTRandAdv */
595
596	/*
597	* Summary.
598	*/
599	if (!g_cErrors)
600	RTPrintf("tstRand: SUCCESS\n");
601	else
602	RTPrintf("tstRand: FAILED - %d errors\n", g_cErrors);
603	return !!g_cErrors;
604	}
605

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source: vbox/trunk/src/VBox/Runtime/testcase/tstRand.cpp@ 91886

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