tstRand.cpp@ 11347

Last change on this file since 11347 was 11347, checked in by vboxsync, 16 years ago
iprt/rand: Added a generic RTRandAdv API for use with any random number generator. Implemented the classic Park-Miller pseudo random number generator.
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File size: 22.5 KB

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1	/* $Id: tstRand.cpp 11347 2008-08-11 21:12:55Z vboxsync $ */
2	/** @file
3	* IPRT - Testcase for the RTRand API.
4	*/
5
6	/*
7	* Copyright (C) 2008 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27	* Clara, CA 95054 USA or visit http://www.sun.com if you need
28	* additional information or have any questions.
29	*/
30
31	/*******************************************************************************
32	* Header Files *
33	*******************************************************************************/
34	#include <iprt/rand.h>
35	#include <iprt/stream.h>
36	#include <iprt/initterm.h>
37	#include <iprt/string.h>
38	#include <iprt/assert.h>
39
40
41	/*******************************************************************************
42	* Structures and Typedefs *
43	*******************************************************************************/
44	typedef struct TSTMEMAUTOPTRSTRUCT
45	{
46	uint32_t a;
47	uint32_t b;
48	uint32_t c;
49	} TSTMEMAUTOPTRSTRUCT;
50
51
52	/*******************************************************************************
53	* Defined Constants And Macros *
54	*******************************************************************************/
55	#define CHECK_EXPR(expr) \
56	do { bool const f = !!(expr); if (RT_UNLIKELY(!f)) { RTPrintf("tstRand(%d): %s!\n", __LINE__, #expr); g_cErrors++; } } while (0)
57	#define CHECK_EXPR_MSG(expr, msg) \
58	do { \
59	bool const f = !!(expr); \
60	if (RT_UNLIKELY(!f)) { \
61	RTPrintf("tstRand(%d): %s!\n", __LINE__, #expr); \
62	RTPrintf("tstRand: "); \
63	RTPrintf msg; \
64	if (++g_cErrors > 25) return 1; \
65	} \
66	} while (0)
67
68
69	#define TST_RAND_SAMPLE_RANGES 16
70
71	/*******************************************************************************
72	* Global Variables *
73	*******************************************************************************/
74	static unsigned g_cErrors = 0;
75
76
77	static void tstRandCheckDist(uint32_t *pacHits, unsigned iTest)
78	{
79	RTPrintf("tstRand:");
80	uint32_t iMin = UINT32_MAX;
81	uint32_t iMax = 0;
82	uint32_t iAvg = 0;
83	for (unsigned iRange = 0; iRange < TST_RAND_SAMPLE_RANGES; iRange++)
84	{
85	RTPrintf(" %04RX32", pacHits[iRange]);
86	if (iMax < pacHits[iRange])
87	iMax = pacHits[iRange];
88	if (iMin > pacHits[iRange])
89	iMin = pacHits[iRange];
90	iAvg += pacHits[iRange];
91	}
92	iAvg /= TST_RAND_SAMPLE_RANGES;
93	RTPrintf(" min=%RX32 (%%%d) max=%RX32 (%%%d) calc avg=%RX32 [test=%d]\n",
94	iMin, (iAvg - iMin) * 100 / iAvg, iMax,
95	(iMax - iAvg) * 100 / iAvg,
96	iAvg,
97	iTest);
98	CHECK_EXPR(iMin >= iAvg - iAvg / 4);
99	CHECK_EXPR(iMax <= iAvg + iAvg / 4);
100	}
101
102
103	static int tstRandAdv(RTRAND hRand)
104	{
105	/*
106	* Test distribution.
107	*/
108	#if 1
109	/* unsigned 32-bit */
110	static const struct
111	{
112	uint32_t u32First;
113	uint32_t u32Last;
114	} s_aU32Tests[] =
115	{
116	{ 0, UINT32_MAX },
117	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
118	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
119	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
120	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
121	{ 0, UINT32_MAX / 2 },
122	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
123	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
124	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
125	};
126	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU32Tests); iTest++)
127	{
128	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
129	uint32_t const uFirst = s_aU32Tests[iTest].u32First;
130	uint32_t const uLast = s_aU32Tests[iTest].u32Last;
131	uint32_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
132	uint32_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
133	RTPrintf("tstRand: TESTING RTRandAdvU32Ex(,%#RX32, %#RX32) distribution... [div=%#RX32 range=%#RX32]\n", uFirst, uLast, uDivisor, uRange);
134	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
135	{
136	uint32_t uRand = RTRandAdvU32Ex(hRand, uFirst, uLast);
137	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX32 %#RX32\n", uRand, uFirst));
138	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX32 %#RX32\n", uRand, uLast));
139	uint32_t off = uRand - uFirst;
140	acHits[off / uDivisor]++;
141	}
142	tstRandCheckDist(acHits, iTest);
143	}
144	#endif
145
146	#if 1
147	/* unsigned 64-bit */
148	static const struct
149	{
150	uint64_t u64First;
151	uint64_t u64Last;
152	} s_aU64Tests[] =
153	{
154	{ 0, UINT64_MAX },
155	{ 0, UINT64_MAX / 2 + UINT64_MAX / 4 },
156	{ 0, UINT64_MAX / 2 + UINT64_MAX / 8 },
157	{ 0, UINT64_MAX / 2 + UINT64_MAX / 16 },
158	{ 0, UINT64_MAX / 2 + UINT64_MAX / 64 },
159	{ 0, UINT64_MAX / 2 },
160	{ UINT64_MAX / 4, UINT64_MAX / 4 * 3 },
161	{ 0, UINT32_MAX },
162	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
163	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
164	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
165	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
166	{ 0, UINT32_MAX / 2 },
167	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
168	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
169	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
170	};
171	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU64Tests); iTest++)
172	{
173	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
174	uint64_t const uFirst = s_aU64Tests[iTest].u64First;
175	uint64_t const uLast = s_aU64Tests[iTest].u64Last;
176	uint64_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
177	uint64_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
178	RTPrintf("tstRand: TESTING RTRandAdvU64Ex(,%#RX64, %#RX64) distribution... [div=%#RX64 range=%#RX64]\n", uFirst, uLast, uDivisor, uRange);
179	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
180	{
181	uint64_t uRand = RTRandAdvU64Ex(hRand, uFirst, uLast);
182	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX64 %#RX64\n", uRand, uFirst));
183	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX64 %#RX64\n", uRand, uLast));
184	uint64_t off = uRand - uFirst;
185	acHits[off / uDivisor]++;
186	}
187	tstRandCheckDist(acHits, iTest);
188	}
189	#endif
190
191	#if 1
192	/* signed 32-bit */
193	static const struct
194	{
195	int32_t i32First;
196	int32_t i32Last;
197	} s_aS32Tests[] =
198	{
199	{ -429496729, 429496729 },
200	{ INT32_MIN, INT32_MAX },
201	{ INT32_MIN, INT32_MAX / 2 },
202	{ -0x20000000, INT32_MAX },
203	{ -0x10000000, INT32_MAX },
204	{ -0x080000000, INT32_MAX },
205	{ -0x008000000, INT32_MAX },
206	{ -0x000800000, INT32_MAX },
207	{ -0x000080000, INT32_MAX },
208	{ -0x000008000, INT32_MAX },
209	{ 2, INT32_MAX / 2 },
210	{ 4000000, INT32_MAX / 2 },
211	{ -4000000, INT32_MAX / 2 },
212	{ INT32_MIN / 2, INT32_MAX / 2 },
213	{ INT32_MIN / 3, INT32_MAX / 2 },
214	{ INT32_MIN / 3, INT32_MAX / 3 },
215	{ INT32_MIN / 3, INT32_MAX / 4 },
216	{ INT32_MIN / 4, INT32_MAX / 4 },
217	{ INT32_MIN / 5, INT32_MAX / 5 },
218	{ INT32_MIN / 6, INT32_MAX / 6 },
219	{ INT32_MIN / 7, INT32_MAX / 6 },
220	{ INT32_MIN / 7, INT32_MAX / 7 },
221	{ INT32_MIN / 7, INT32_MAX / 8 },
222	{ INT32_MIN / 8, INT32_MAX / 8 },
223	{ INT32_MIN / 9, INT32_MAX / 9 },
224	{ INT32_MIN / 9, INT32_MAX / 12 },
225	{ INT32_MIN / 12, INT32_MAX / 12 },
226	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
227	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 },
228	};
229	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS32Tests); iTest++)
230	{
231	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
232	int32_t const iFirst = s_aS32Tests[iTest].i32First;
233	int32_t const iLast = s_aS32Tests[iTest].i32Last;
234	uint32_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
235	uint32_t const uDivisor = (uRange ? uRange : UINT32_MAX) / TST_RAND_SAMPLE_RANGES + 1;
236	RTPrintf("tstRand: TESTING RTRandAdvS32Ex(,%#RI32, %#RI32) distribution... [div=%#RX32 range=%#RX32]\n", iFirst, iLast, uDivisor, uRange);
237	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
238	{
239	int32_t iRand = RTRandAdvS32Ex(hRand, iFirst, iLast);
240	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI32 %#RI32\n", iRand, iFirst));
241	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI32 %#RI32\n", iRand, iLast));
242	uint32_t off = iRand - iFirst;
243	acHits[off / uDivisor]++;
244	}
245	tstRandCheckDist(acHits, iTest);
246	}
247	#endif
248
249	#if 1
250	/* signed 64-bit */
251	static const struct
252	{
253	int64_t i64First;
254	int64_t i64Last;
255	} s_aS64Tests[] =
256	{
257	{ INT64_MIN, INT64_MAX },
258	{ INT64_MIN, INT64_MAX / 2 },
259	{ INT64_MIN / 2, INT64_MAX / 2 },
260	{ INT64_MIN / 2 + INT64_MIN / 4, INT64_MAX / 2 },
261	{ INT64_MIN / 2 + INT64_MIN / 8, INT64_MAX / 2 },
262	{ INT64_MIN / 2 + INT64_MIN / 16, INT64_MAX / 2 },
263	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 },
264	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 + INT64_MAX / 64 },
265	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 64 },
266	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 8 },
267	{ INT64_MIN / 2, INT64_MAX / 2 - INT64_MAX / 8 },
268	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 4 },
269	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 8 },
270	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 - INT64_MAX / 8 },
271	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 8 },
272	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 16 },
273	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 16 },
274	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 32 },
275	{ INT64_MIN / 2 - INT64_MIN / 64, INT64_MAX / 2 - INT64_MAX / 64 },
276	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 },
277	{ INT64_MIN / 4, INT64_MAX / 4 },
278	{ INT64_MIN / 5, INT64_MAX / 5 },
279	{ INT64_MIN / 6, INT64_MAX / 6 },
280	{ INT64_MIN / 7, INT64_MAX / 7 },
281	{ INT64_MIN / 8, INT64_MAX / 8 },
282	{ INT32_MIN, INT32_MAX },
283	{ INT32_MIN, INT32_MAX / 2 },
284	{ -0x20000000, INT32_MAX },
285	{ -0x10000000, INT32_MAX },
286	{ -0x7f000000, INT32_MAX },
287	{ -0x08000000, INT32_MAX },
288	{ -0x00800000, INT32_MAX },
289	{ -0x00080000, INT32_MAX },
290	{ -0x00008000, INT32_MAX },
291	{ 2, INT32_MAX / 2 },
292	{ 4000000, INT32_MAX / 2 },
293	{ -4000000, INT32_MAX / 2 },
294	{ INT32_MIN / 2, INT32_MAX / 2 },
295	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
296	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 }
297	};
298	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS64Tests); iTest++)
299	{
300	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
301	int64_t const iFirst = s_aS64Tests[iTest].i64First;
302	int64_t const iLast = s_aS64Tests[iTest].i64Last;
303	uint64_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
304	uint64_t const uDivisor = (uRange ? uRange : UINT64_MAX) / TST_RAND_SAMPLE_RANGES + 1;
305	RTPrintf("tstRand: TESTING RTRandAdvS64Ex(,%#RI64, %#RI64) distribution... [div=%#RX64 range=%#016RX64]\n", iFirst, iLast, uDivisor, uRange);
306	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
307	{
308	int64_t iRand = RTRandAdvS64Ex(hRand, iFirst, iLast);
309	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI64 %#RI64\n", iRand, iFirst));
310	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI64 %#RI64\n", iRand, iLast));
311	uint64_t off = iRand - iFirst;
312	acHits[off / uDivisor]++;
313	}
314	tstRandCheckDist(acHits, iTest);
315	}
316	#endif
317
318	/*
319	* Destroy it.
320	*/
321	int rc = RTRandAdvDestroy(hRand);
322	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvDestroy(%p) -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
323
324	return 0;
325	}
326
327
328
329	int main()
330	{
331	RTR3Init(false);
332	RTPrintf("tstRand: TESTING...\n");
333
334	/*
335	* Do some smoke tests first?
336	*/
337	/** @todo RTRand smoke testing. */
338
339	#if 1
340	/*
341	* Test distribution.
342	*/
343	#if 1
344	/* unsigned 32-bit */
345	static const struct
346	{
347	uint32_t u32First;
348	uint32_t u32Last;
349	} s_aU32Tests[] =
350	{
351	{ 0, UINT32_MAX },
352	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
353	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
354	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
355	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
356	{ 0, UINT32_MAX / 2 },
357	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
358	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
359	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
360	};
361	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU32Tests); iTest++)
362	{
363	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
364	uint32_t const uFirst = s_aU32Tests[iTest].u32First;
365	uint32_t const uLast = s_aU32Tests[iTest].u32Last;
366	uint32_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
367	uint32_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
368	RTPrintf("tstRand: TESTING RTRandU32Ex(%#RX32, %#RX32) distribution... [div=%#RX32 range=%#RX32]\n", uFirst, uLast, uDivisor, uRange);
369	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
370	{
371	uint32_t uRand = RTRandU32Ex(uFirst, uLast);
372	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX32 %#RX32\n", uRand, uFirst));
373	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX32 %#RX32\n", uRand, uLast));
374	uint32_t off = uRand - uFirst;
375	acHits[off / uDivisor]++;
376	}
377	tstRandCheckDist(acHits, iTest);
378	}
379	#endif
380
381	#if 1
382	/* unsigned 64-bit */
383	static const struct
384	{
385	uint64_t u64First;
386	uint64_t u64Last;
387	} s_aU64Tests[] =
388	{
389	{ 0, UINT64_MAX },
390	{ 0, UINT64_MAX / 2 + UINT64_MAX / 4 },
391	{ 0, UINT64_MAX / 2 + UINT64_MAX / 8 },
392	{ 0, UINT64_MAX / 2 + UINT64_MAX / 16 },
393	{ 0, UINT64_MAX / 2 + UINT64_MAX / 64 },
394	{ 0, UINT64_MAX / 2 },
395	{ UINT64_MAX / 4, UINT64_MAX / 4 * 3 },
396	{ 0, UINT32_MAX },
397	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
398	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
399	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
400	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
401	{ 0, UINT32_MAX / 2 },
402	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
403	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
404	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
405	};
406	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU64Tests); iTest++)
407	{
408	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
409	uint64_t const uFirst = s_aU64Tests[iTest].u64First;
410	uint64_t const uLast = s_aU64Tests[iTest].u64Last;
411	uint64_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
412	uint64_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
413	RTPrintf("tstRand: TESTING RTRandU64Ex(%#RX64, %#RX64) distribution... [div=%#RX64 range=%#RX64]\n", uFirst, uLast, uDivisor, uRange);
414	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
415	{
416	uint64_t uRand = RTRandU64Ex(uFirst, uLast);
417	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX64 %#RX64\n", uRand, uFirst));
418	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX64 %#RX64\n", uRand, uLast));
419	uint64_t off = uRand - uFirst;
420	acHits[off / uDivisor]++;
421	}
422	tstRandCheckDist(acHits, iTest);
423	}
424	#endif
425
426	#if 1
427	/* signed 32-bit */
428	static const struct
429	{
430	int32_t i32First;
431	int32_t i32Last;
432	} s_aS32Tests[] =
433	{
434	{ -429496729, 429496729 },
435	{ INT32_MIN, INT32_MAX },
436	{ INT32_MIN, INT32_MAX / 2 },
437	{ -0x20000000, INT32_MAX },
438	{ -0x10000000, INT32_MAX },
439	{ -0x080000000, INT32_MAX },
440	{ -0x008000000, INT32_MAX },
441	{ -0x000800000, INT32_MAX },
442	{ -0x000080000, INT32_MAX },
443	{ -0x000008000, INT32_MAX },
444	{ 2, INT32_MAX / 2 },
445	{ 4000000, INT32_MAX / 2 },
446	{ -4000000, INT32_MAX / 2 },
447	{ INT32_MIN / 2, INT32_MAX / 2 },
448	{ INT32_MIN / 3, INT32_MAX / 2 },
449	{ INT32_MIN / 3, INT32_MAX / 3 },
450	{ INT32_MIN / 3, INT32_MAX / 4 },
451	{ INT32_MIN / 4, INT32_MAX / 4 },
452	{ INT32_MIN / 5, INT32_MAX / 5 },
453	{ INT32_MIN / 6, INT32_MAX / 6 },
454	{ INT32_MIN / 7, INT32_MAX / 6 },
455	{ INT32_MIN / 7, INT32_MAX / 7 },
456	{ INT32_MIN / 7, INT32_MAX / 8 },
457	{ INT32_MIN / 8, INT32_MAX / 8 },
458	{ INT32_MIN / 9, INT32_MAX / 9 },
459	{ INT32_MIN / 9, INT32_MAX / 12 },
460	{ INT32_MIN / 12, INT32_MAX / 12 },
461	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
462	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 },
463	};
464	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS32Tests); iTest++)
465	{
466	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
467	int32_t const iFirst = s_aS32Tests[iTest].i32First;
468	int32_t const iLast = s_aS32Tests[iTest].i32Last;
469	uint32_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
470	uint32_t const uDivisor = (uRange ? uRange : UINT32_MAX) / TST_RAND_SAMPLE_RANGES + 1;
471	RTPrintf("tstRand: TESTING RTRandS32Ex(%#RI32, %#RI32) distribution... [div=%#RX32 range=%#RX32]\n", iFirst, iLast, uDivisor, uRange);
472	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
473	{
474	int32_t iRand = RTRandS32Ex(iFirst, iLast);
475	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI32 %#RI32\n", iRand, iFirst));
476	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI32 %#RI32\n", iRand, iLast));
477	uint32_t off = iRand - iFirst;
478	acHits[off / uDivisor]++;
479	}
480	tstRandCheckDist(acHits, iTest);
481	}
482	#endif
483
484	#if 1
485	/* signed 64-bit */
486	static const struct
487	{
488	int64_t i64First;
489	int64_t i64Last;
490	} s_aS64Tests[] =
491	{
492	{ INT64_MIN, INT64_MAX },
493	{ INT64_MIN, INT64_MAX / 2 },
494	{ INT64_MIN / 2, INT64_MAX / 2 },
495	{ INT64_MIN / 2 + INT64_MIN / 4, INT64_MAX / 2 },
496	{ INT64_MIN / 2 + INT64_MIN / 8, INT64_MAX / 2 },
497	{ INT64_MIN / 2 + INT64_MIN / 16, INT64_MAX / 2 },
498	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 },
499	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 + INT64_MAX / 64 },
500	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 64 },
501	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 8 },
502	{ INT64_MIN / 2, INT64_MAX / 2 - INT64_MAX / 8 },
503	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 4 },
504	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 8 },
505	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 - INT64_MAX / 8 },
506	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 8 },
507	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 16 },
508	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 16 },
509	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 32 },
510	{ INT64_MIN / 2 - INT64_MIN / 64, INT64_MAX / 2 - INT64_MAX / 64 },
511	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 },
512	{ INT64_MIN / 4, INT64_MAX / 4 },
513	{ INT64_MIN / 5, INT64_MAX / 5 },
514	{ INT64_MIN / 6, INT64_MAX / 6 },
515	{ INT64_MIN / 7, INT64_MAX / 7 },
516	{ INT64_MIN / 8, INT64_MAX / 8 },
517	{ INT32_MIN, INT32_MAX },
518	{ INT32_MIN, INT32_MAX / 2 },
519	{ -0x20000000, INT32_MAX },
520	{ -0x10000000, INT32_MAX },
521	{ -0x7f000000, INT32_MAX },
522	{ -0x08000000, INT32_MAX },
523	{ -0x00800000, INT32_MAX },
524	{ -0x00080000, INT32_MAX },
525	{ -0x00008000, INT32_MAX },
526	{ 2, INT32_MAX / 2 },
527	{ 4000000, INT32_MAX / 2 },
528	{ -4000000, INT32_MAX / 2 },
529	{ INT32_MIN / 2, INT32_MAX / 2 },
530	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
531	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 }
532	};
533	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS64Tests); iTest++)
534	{
535	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
536	int64_t const iFirst = s_aS64Tests[iTest].i64First;
537	int64_t const iLast = s_aS64Tests[iTest].i64Last;
538	uint64_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
539	uint64_t const uDivisor = (uRange ? uRange : UINT64_MAX) / TST_RAND_SAMPLE_RANGES + 1;
540	RTPrintf("tstRand: TESTING RTRandS64Ex(%#RI64, %#RI64) distribution... [div=%#RX64 range=%#016RX64]\n", iFirst, iLast, uDivisor, uRange);
541	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
542	{
543	int64_t iRand = RTRandS64Ex(iFirst, iLast);
544	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI64 %#RI64\n", iRand, iFirst));
545	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI64 %#RI64\n", iRand, iLast));
546	uint64_t off = iRand - iFirst;
547	acHits[off / uDivisor]++;
548	}
549	tstRandCheckDist(acHits, iTest);
550	}
551	#endif
552	#endif /* Testing RTRand */
553
554	#if 1
555	/*
556	* Test the various random generators.
557	*/
558	RTPrintf("tstRand: TESTING RTRandAdvCreateParkerMiller\n");
559	RTRAND hRand;
560	int rc = RTRandAdvCreateParkMiller(&hRand);
561	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("rc=%Rrc\n", rc));
562	if (RT_SUCCESS(rc))
563	if (tstRandAdv(hRand))
564	return 1;
565
566	#endif /* Testing RTRandAdv */
567
568	/*
569	* Summary.
570	*/
571	if (!g_cErrors)
572	RTPrintf("tstRand: SUCCESS\n");
573	else
574	RTPrintf("tstRand: FAILED - %d errors\n", g_cErrors);
575	return !!g_cErrors;
576	}
577

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source: vbox/trunk/src/VBox/Runtime/testcase/tstRand.cpp@ 11347

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