tstRand.cpp@ 20606

Last change on this file since 20606 was 18455, checked in by vboxsync, 16 years ago
tstRand: fixed warning stemming from a row of extra zeros.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 23.7 KB

Line
1	/* $Id: tstRand.cpp 18455 2009-03-28 04:45:00Z 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	{ -0x08000000, INT32_MAX },
205	{ -0x00800000, INT32_MAX },
206	{ -0x00080000, INT32_MAX },
207	{ -0x00008000, INT32_MAX },
208	{ -0x00000800, 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	* Test saving and restoring the state.
320	*/
321	RTPrintf("tstRand: TESTING RTRandAdvSave/RestoreSave\n");
322	char szState[256];
323	size_t cbState = sizeof(szState);
324	int rc = RTRandAdvSaveState(hRand, szState, &cbState);
325	if (rc != VERR_NOT_SUPPORTED)
326	{
327	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvSaveState(%p,,256) -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
328	uint32_t const u32A1 = RTRandAdvU32(hRand);
329	uint32_t const u32B1 = RTRandAdvU32(hRand);
330	RTPrintf("tstRand: state:\"%s\" A=%RX32 B=%RX32\n", szState, u32A1, u32B1);
331
332	rc = RTRandAdvRestoreState(hRand, szState);
333	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvRestoreState(%p,\"%s\") -> %Rrc (%d)\n", (uintptr_t)hRand, szState, rc, rc));
334	uint32_t const u32A2 = RTRandAdvU32(hRand);
335	uint32_t const u32B2 = RTRandAdvU32(hRand);
336	CHECK_EXPR_MSG(u32A1 == u32A2, ("u32A1=%RX32 u32A2=%RX32\n", u32A1, u32A2));
337	CHECK_EXPR_MSG(u32B1 == u32B2, ("u32B1=%RX32 u32B2=%RX32\n", u32B1, u32B2));
338	}
339	else
340	{
341	szState[0] = '\0';
342	rc = RTRandAdvRestoreState(hRand, szState);
343	CHECK_EXPR_MSG(rc == VERR_NOT_SUPPORTED, ("RTRandAdvRestoreState(%p,\"\") -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
344	}
345
346
347	/*
348	* Destroy it.
349	*/
350	rc = RTRandAdvDestroy(hRand);
351	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("RTRandAdvDestroy(%p) -> %Rrc (%d)\n", (uintptr_t)hRand, rc, rc));
352
353	return 0;
354	}
355
356
357
358	int main()
359	{
360	RTR3Init();
361	RTPrintf("tstRand: TESTING...\n");
362
363	/*
364	* Do some smoke tests first?
365	*/
366	/** @todo RTRand smoke testing. */
367
368	#if 1
369	/*
370	* Test distribution.
371	*/
372	#if 1
373	/* unsigned 32-bit */
374	static const struct
375	{
376	uint32_t u32First;
377	uint32_t u32Last;
378	} s_aU32Tests[] =
379	{
380	{ 0, UINT32_MAX },
381	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
382	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
383	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
384	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
385	{ 0, UINT32_MAX / 2 },
386	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
387	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
388	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
389	};
390	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU32Tests); iTest++)
391	{
392	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
393	uint32_t const uFirst = s_aU32Tests[iTest].u32First;
394	uint32_t const uLast = s_aU32Tests[iTest].u32Last;
395	uint32_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
396	uint32_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
397	RTPrintf("tstRand: TESTING RTRandU32Ex(%#RX32, %#RX32) distribution... [div=%#RX32 range=%#RX32]\n", uFirst, uLast, uDivisor, uRange);
398	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
399	{
400	uint32_t uRand = RTRandU32Ex(uFirst, uLast);
401	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX32 %#RX32\n", uRand, uFirst));
402	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX32 %#RX32\n", uRand, uLast));
403	uint32_t off = uRand - uFirst;
404	acHits[off / uDivisor]++;
405	}
406	tstRandCheckDist(acHits, iTest);
407	}
408	#endif
409
410	#if 1
411	/* unsigned 64-bit */
412	static const struct
413	{
414	uint64_t u64First;
415	uint64_t u64Last;
416	} s_aU64Tests[] =
417	{
418	{ 0, UINT64_MAX },
419	{ 0, UINT64_MAX / 2 + UINT64_MAX / 4 },
420	{ 0, UINT64_MAX / 2 + UINT64_MAX / 8 },
421	{ 0, UINT64_MAX / 2 + UINT64_MAX / 16 },
422	{ 0, UINT64_MAX / 2 + UINT64_MAX / 64 },
423	{ 0, UINT64_MAX / 2 },
424	{ UINT64_MAX / 4, UINT64_MAX / 4 * 3 },
425	{ 0, UINT32_MAX },
426	{ 0, UINT32_MAX / 2 + UINT32_MAX / 4 },
427	{ 0, UINT32_MAX / 2 + UINT32_MAX / 8 },
428	{ 0, UINT32_MAX / 2 + UINT32_MAX / 16 },
429	{ 0, UINT32_MAX / 2 + UINT32_MAX / 64 },
430	{ 0, UINT32_MAX / 2 },
431	{ UINT32_MAX / 4, UINT32_MAX / 4 * 3 },
432	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
433	{ 1234, 1234 + TST_RAND_SAMPLE_RANGES - 1 },
434	};
435	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aU64Tests); iTest++)
436	{
437	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
438	uint64_t const uFirst = s_aU64Tests[iTest].u64First;
439	uint64_t const uLast = s_aU64Tests[iTest].u64Last;
440	uint64_t const uRange = uLast - uFirst; Assert(uLast >= uFirst);
441	uint64_t const uDivisor = uRange / TST_RAND_SAMPLE_RANGES + 1;
442	RTPrintf("tstRand: TESTING RTRandU64Ex(%#RX64, %#RX64) distribution... [div=%#RX64 range=%#RX64]\n", uFirst, uLast, uDivisor, uRange);
443	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
444	{
445	uint64_t uRand = RTRandU64Ex(uFirst, uLast);
446	CHECK_EXPR_MSG(uRand >= uFirst, ("%#RX64 %#RX64\n", uRand, uFirst));
447	CHECK_EXPR_MSG(uRand <= uLast, ("%#RX64 %#RX64\n", uRand, uLast));
448	uint64_t off = uRand - uFirst;
449	acHits[off / uDivisor]++;
450	}
451	tstRandCheckDist(acHits, iTest);
452	}
453	#endif
454
455	#if 1
456	/* signed 32-bit */
457	static const struct
458	{
459	int32_t i32First;
460	int32_t i32Last;
461	} s_aS32Tests[] =
462	{
463	{ -429496729, 429496729 },
464	{ INT32_MIN, INT32_MAX },
465	{ INT32_MIN, INT32_MAX / 2 },
466	{ -0x20000000, INT32_MAX },
467	{ -0x10000000, INT32_MAX },
468	{ -0x08000000, INT32_MAX },
469	{ -0x00800000, INT32_MAX },
470	{ -0x00080000, INT32_MAX },
471	{ -0x00008000, INT32_MAX },
472	{ -0x00000800, INT32_MAX },
473	{ 2, INT32_MAX / 2 },
474	{ 4000000, INT32_MAX / 2 },
475	{ -4000000, INT32_MAX / 2 },
476	{ INT32_MIN / 2, INT32_MAX / 2 },
477	{ INT32_MIN / 3, INT32_MAX / 2 },
478	{ INT32_MIN / 3, INT32_MAX / 3 },
479	{ INT32_MIN / 3, INT32_MAX / 4 },
480	{ INT32_MIN / 4, INT32_MAX / 4 },
481	{ INT32_MIN / 5, INT32_MAX / 5 },
482	{ INT32_MIN / 6, INT32_MAX / 6 },
483	{ INT32_MIN / 7, INT32_MAX / 6 },
484	{ INT32_MIN / 7, INT32_MAX / 7 },
485	{ INT32_MIN / 7, INT32_MAX / 8 },
486	{ INT32_MIN / 8, INT32_MAX / 8 },
487	{ INT32_MIN / 9, INT32_MAX / 9 },
488	{ INT32_MIN / 9, INT32_MAX / 12 },
489	{ INT32_MIN / 12, INT32_MAX / 12 },
490	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
491	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 },
492	};
493	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS32Tests); iTest++)
494	{
495	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
496	int32_t const iFirst = s_aS32Tests[iTest].i32First;
497	int32_t const iLast = s_aS32Tests[iTest].i32Last;
498	uint32_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
499	uint32_t const uDivisor = (uRange ? uRange : UINT32_MAX) / TST_RAND_SAMPLE_RANGES + 1;
500	RTPrintf("tstRand: TESTING RTRandS32Ex(%#RI32, %#RI32) distribution... [div=%#RX32 range=%#RX32]\n", iFirst, iLast, uDivisor, uRange);
501	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
502	{
503	int32_t iRand = RTRandS32Ex(iFirst, iLast);
504	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI32 %#RI32\n", iRand, iFirst));
505	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI32 %#RI32\n", iRand, iLast));
506	uint32_t off = iRand - iFirst;
507	acHits[off / uDivisor]++;
508	}
509	tstRandCheckDist(acHits, iTest);
510	}
511	#endif
512
513	#if 1
514	/* signed 64-bit */
515	static const struct
516	{
517	int64_t i64First;
518	int64_t i64Last;
519	} s_aS64Tests[] =
520	{
521	{ INT64_MIN, INT64_MAX },
522	{ INT64_MIN, INT64_MAX / 2 },
523	{ INT64_MIN / 2, INT64_MAX / 2 },
524	{ INT64_MIN / 2 + INT64_MIN / 4, INT64_MAX / 2 },
525	{ INT64_MIN / 2 + INT64_MIN / 8, INT64_MAX / 2 },
526	{ INT64_MIN / 2 + INT64_MIN / 16, INT64_MAX / 2 },
527	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 },
528	{ INT64_MIN / 2 + INT64_MIN / 64, INT64_MAX / 2 + INT64_MAX / 64 },
529	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 64 },
530	{ INT64_MIN / 2, INT64_MAX / 2 + INT64_MAX / 8 },
531	{ INT64_MIN / 2, INT64_MAX / 2 - INT64_MAX / 8 },
532	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 4 },
533	{ INT64_MIN / 2 - INT64_MIN / 4, INT64_MAX / 2 - INT64_MAX / 8 },
534	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 - INT64_MAX / 8 },
535	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 8 },
536	{ INT64_MIN / 2 - INT64_MIN / 16, INT64_MAX / 2 - INT64_MAX / 16 },
537	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 16 },
538	{ INT64_MIN / 2 - INT64_MIN / 32, INT64_MAX / 2 - INT64_MAX / 32 },
539	{ INT64_MIN / 2 - INT64_MIN / 64, INT64_MAX / 2 - INT64_MAX / 64 },
540	{ INT64_MIN / 2 - INT64_MIN / 8, INT64_MAX / 2 },
541	{ INT64_MIN / 4, INT64_MAX / 4 },
542	{ INT64_MIN / 5, INT64_MAX / 5 },
543	{ INT64_MIN / 6, INT64_MAX / 6 },
544	{ INT64_MIN / 7, INT64_MAX / 7 },
545	{ INT64_MIN / 8, INT64_MAX / 8 },
546	{ INT32_MIN, INT32_MAX },
547	{ INT32_MIN, INT32_MAX / 2 },
548	{ -0x20000000, INT32_MAX },
549	{ -0x10000000, INT32_MAX },
550	{ -0x7f000000, INT32_MAX },
551	{ -0x08000000, INT32_MAX },
552	{ -0x00800000, INT32_MAX },
553	{ -0x00080000, INT32_MAX },
554	{ -0x00008000, INT32_MAX },
555	{ 2, INT32_MAX / 2 },
556	{ 4000000, INT32_MAX / 2 },
557	{ -4000000, INT32_MAX / 2 },
558	{ INT32_MIN / 2, INT32_MAX / 2 },
559	{ 0, TST_RAND_SAMPLE_RANGES - 1 },
560	{ -TST_RAND_SAMPLE_RANGES / 2, TST_RAND_SAMPLE_RANGES / 2 - 1 }
561	};
562	for (unsigned iTest = 0; iTest < RT_ELEMENTS(s_aS64Tests); iTest++)
563	{
564	uint32_t acHits[TST_RAND_SAMPLE_RANGES] = {0};
565	int64_t const iFirst = s_aS64Tests[iTest].i64First;
566	int64_t const iLast = s_aS64Tests[iTest].i64Last;
567	uint64_t const uRange = iLast - iFirst; AssertMsg(iLast >= iFirst, ("%d\n", iTest));
568	uint64_t const uDivisor = (uRange ? uRange : UINT64_MAX) / TST_RAND_SAMPLE_RANGES + 1;
569	RTPrintf("tstRand: TESTING RTRandS64Ex(%#RI64, %#RI64) distribution... [div=%#RX64 range=%#016RX64]\n", iFirst, iLast, uDivisor, uRange);
570	for (unsigned iSample = 0; iSample < TST_RAND_SAMPLE_RANGES * 10240; iSample++)
571	{
572	int64_t iRand = RTRandS64Ex(iFirst, iLast);
573	CHECK_EXPR_MSG(iRand >= iFirst, ("%#RI64 %#RI64\n", iRand, iFirst));
574	CHECK_EXPR_MSG(iRand <= iLast, ("%#RI64 %#RI64\n", iRand, iLast));
575	uint64_t off = iRand - iFirst;
576	acHits[off / uDivisor]++;
577	}
578	tstRandCheckDist(acHits, iTest);
579	}
580	#endif
581	#endif /* Testing RTRand */
582
583	#if 1
584	/*
585	* Test the various random generators.
586	*/
587	RTPrintf("tstRand: TESTING RTRandAdvCreateParkerMiller\n");
588	RTRAND hRand;
589	int rc = RTRandAdvCreateParkMiller(&hRand);
590	CHECK_EXPR_MSG(rc == VINF_SUCCESS, ("rc=%Rrc\n", rc));
591	if (RT_SUCCESS(rc))
592	if (tstRandAdv(hRand))
593	return 1;
594
595	#endif /* Testing RTRandAdv */
596
597	/*
598	* Summary.
599	*/
600	if (!g_cErrors)
601	RTPrintf("tstRand: SUCCESS\n");
602	else
603	RTPrintf("tstRand: FAILED - %d errors\n", g_cErrors);
604	return !!g_cErrors;
605	}
606

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source: vbox/trunk/src/VBox/Runtime/testcase/tstRand.cpp@ 20606

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