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qsimd.cpp

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1/****************************************************************************-
2**-
3** Copyright (C) 2016 The Qt Company Ltd.-
4** Copyright (C) 2016 Intel Corporation.-
5** Contact: https://www.qt.io/licensing/-
6**-
7** This file is part of the QtCore module of the Qt Toolkit.-
8**-
9** $QT_BEGIN_LICENSE:LGPL$-
10** Commercial License Usage-
11** Licensees holding valid commercial Qt licenses may use this file in-
12** accordance with the commercial license agreement provided with the-
13** Software or, alternatively, in accordance with the terms contained in-
14** a written agreement between you and The Qt Company. For licensing terms-
15** and conditions see https://www.qt.io/terms-conditions. For further-
16** information use the contact form at https://www.qt.io/contact-us.-
17**-
18** GNU Lesser General Public License Usage-
19** Alternatively, this file may be used under the terms of the GNU Lesser-
20** General Public License version 3 as published by the Free Software-
21** Foundation and appearing in the file LICENSE.LGPL3 included in the-
22** packaging of this file. Please review the following information to-
23** ensure the GNU Lesser General Public License version 3 requirements-
24** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.-
25**-
26** GNU General Public License Usage-
27** Alternatively, this file may be used under the terms of the GNU-
28** General Public License version 2.0 or (at your option) the GNU General-
29** Public license version 3 or any later version approved by the KDE Free-
30** Qt Foundation. The licenses are as published by the Free Software-
31** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3-
32** included in the packaging of this file. Please review the following-
33** information to ensure the GNU General Public License requirements will-
34** be met: https://www.gnu.org/licenses/gpl-2.0.html and-
35** https://www.gnu.org/licenses/gpl-3.0.html.-
36**-
37** $QT_END_LICENSE$-
38**-
39****************************************************************************/-
40-
41#include "qsimd_p.h"-
42#include "qalgorithms.h"-
43#include <QByteArray>-
44#include <stdio.h>-
45-
46#ifdef Q_OS_LINUX-
47# include "../testlib/3rdparty/valgrind_p.h"-
48#endif-
49-
50#if defined(Q_OS_WIN)-
51# if defined(Q_OS_WINCE)-
52# include <qt_windows.h>-
53# if _WIN32_WCE < 0x800-
54# include <cmnintrin.h>-
55# endif-
56# endif-
57# if !defined(Q_CC_GNU)-
58# ifndef Q_OS_WINCE-
59# include <intrin.h>-
60# endif-
61# endif-
62#elif defined(Q_OS_LINUX) && (defined(Q_PROCESSOR_ARM) || defined(Q_PROCESSOR_MIPS_32))-
63#include "private/qcore_unix_p.h"-
64-
65// the kernel header definitions for HWCAP_*-
66// (the ones we need/may need anyway)-
67-
68// copied from <asm/hwcap.h> (ARM)-
69#define HWCAP_CRUNCH 1024-
70#define HWCAP_THUMBEE 2048-
71#define HWCAP_NEON 4096-
72#define HWCAP_VFPv3 8192-
73#define HWCAP_VFPv3D16 16384-
74-
75// copied from <asm/hwcap.h> (ARM):-
76#define HWCAP2_CRC32 (1 << 4)-
77-
78// copied from <asm/hwcap.h> (Aarch64)-
79#define HWCAP_CRC32 (1 << 7)-
80-
81// copied from <linux/auxvec.h>-
82#define AT_HWCAP 16 /* arch dependent hints at CPU capabilities */-
83#define AT_HWCAP2 26 /* extension of AT_HWCAP */-
84-
85#elif defined(Q_CC_GHS)-
86#include <INTEGRITY_types.h>-
87#endif-
88-
89QT_BEGIN_NAMESPACE-
90-
91#if defined (Q_OS_NACL)-
92static inline uint detectProcessorFeatures()-
93{-
94 return 0;-
95}-
96#elif defined (Q_OS_WINCE)-
97static inline quint64 detectProcessorFeatures()-
98{-
99 quint64 features = 0;-
100-
101#if defined (ARM)-
102# ifdef PF_ARM_NEON-
103 if (IsProcessorFeaturePresent(PF_ARM_NEON))-
104 features |= Q_UINT64_C(1) << CpuFeatureNEON;-
105# endif-
106#elif defined(_X86_)-
107 if (IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE))-
108 features |= Q_UINT64_C(1) << CpuFeatureSSE2;-
109 if (IsProcessorFeaturePresent(PF_SSE3_INSTRUCTIONS_AVAILABLE))-
110 features |= Q_UINT64_C(1) << CpuFeatureSSE3;-
111#endif-
112 return features;-
113}-
114-
115#elif defined(Q_PROCESSOR_ARM)-
116static inline quint64 detectProcessorFeatures()-
117{-
118 quint64 features = 0;-
119-
120#if defined(Q_OS_LINUX)-
121# if defined(Q_PROCESSOR_ARM_V8) && defined(Q_PROCESSOR_ARM_64)-
122 features |= Q_UINT64_C(1) << CpuFeatureNEON; // NEON is always available on ARMv8 64bit.-
123# endif-
124 int auxv = qt_safe_open("/proc/self/auxv", O_RDONLY);-
125 if (auxv != -1) {-
126 unsigned long vector[64];-
127 int nread;-
128 while (features == 0) {-
129 nread = qt_safe_read(auxv, (char *)vector, sizeof vector);-
130 if (nread <= 0) {-
131 // EOF or error-
132 break;-
133 }-
134-
135 int max = nread / (sizeof vector[0]);-
136 for (int i = 0; i < max; i += 2) {-
137 if (vector[i] == AT_HWCAP) {-
138# if defined(Q_PROCESSOR_ARM_V8) && defined(Q_PROCESSOR_ARM_64)-
139 // For Aarch64:-
140 if (vector[i+1] & HWCAP_CRC32)-
141 features |= Q_UINT64_C(1) << CpuFeatureCRC32;-
142# endif-
143 // Aarch32, or ARMv7 or before:-
144 if (vector[i+1] & HWCAP_NEON)-
145 features |= Q_UINT64_C(1) << CpuFeatureNEON;-
146 }-
147# if defined(Q_PROCESSOR_ARM_32)-
148 // For Aarch32:-
149 if (vector[i] == AT_HWCAP2) {-
150 if (vector[i+1] & HWCAP2_CRC32)-
151 features |= Q_UINT64_C(1) << CpuFeatureCRC32;-
152 }-
153# endif-
154 }-
155 }-
156-
157 qt_safe_close(auxv);-
158 return features;-
159 }-
160 // fall back if /proc/self/auxv wasn't found-
161#endif-
162-
163#if defined(__ARM_NEON__)-
164 features |= Q_UINT64_C(1) << CpuFeatureNEON;-
165#endif-
166#if defined(__ARM_FEATURE_CRC32)-
167 features |= Q_UINT64_C(1) << CpuFeatureCRC32;-
168#endif-
169-
170 return features;-
171}-
172-
173#elif defined(Q_PROCESSOR_X86)-
174-
175#ifdef Q_PROCESSOR_X86_32-
176# define PICreg "%%ebx"-
177#else-
178# define PICreg "%%rbx"-
179#endif-
180-
181static int maxBasicCpuidSupported()-
182{-
183#if defined(Q_CC_GNU)-
184 qregisterint tmp1;-
185-
186# if Q_PROCESSOR_X86 < 5-
187 // check if the CPUID instruction is supported-
188 long cpuid_supported;-
189 asm ("pushf\n"-
190 "pop %0\n"-
191 "mov %0, %1\n"-
192 "xor $0x00200000, %0\n"-
193 "push %0\n"-
194 "popf\n"-
195 "pushf\n"-
196 "pop %0\n"-
197 "xor %1, %0\n" // %eax is now 0 if CPUID is not supported-
198 : "=a" (cpuid_supported), "=r" (tmp1)-
199 );-
200 if (!cpuid_supported)-
201 return 0;-
202# endif-
203-
204 int result;-
205 asm ("xchg " PICreg", %1\n"-
206 "cpuid\n"-
207 "xchg " PICreg", %1\n"-
208 : "=&a" (result), "=&r" (tmp1)-
209 : "0" (0)-
210 : "ecx", "edx");-
211 return result;
executed 1162 times by 97 tests: return result;
Executed by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
1162
212#elif defined(Q_OS_WIN)-
213 // Use the __cpuid function; if the CPUID instruction isn't supported, it will return 0-
214 int info[4];-
215 __cpuid(info, 0);-
216 return info[0];-
217#elif defined(Q_CC_GHS)-
218 unsigned int info[4];-
219 __CPUID(0, info);-
220 return info[0];-
221#else-
222 return 0;-
223#endif-
224}-
225-
226static void cpuidFeatures01(uint &ecx, uint &edx)-
227{-
228#if defined(Q_CC_GNU)-
229 qregisterint tmp1;-
230 asm ("xchg " PICreg", %2\n"-
231 "cpuid\n"-
232 "xchg " PICreg", %2\n"-
233 : "=&c" (ecx), "=&d" (edx), "=&r" (tmp1)-
234 : "a" (1));-
235#elif defined(Q_OS_WIN)-
236 int info[4];-
237 __cpuid(info, 1);-
238 ecx = info[2];-
239 edx = info[3];-
240#elif defined(Q_CC_GHS)-
241 unsigned int info[4];-
242 __CPUID(1, info);-
243 ecx = info[2];-
244 edx = info[3];-
245#endif-
246}
executed 1162 times by 97 tests: end of block
Executed by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
1162
247-
248#ifdef Q_OS_WIN-
249inline void __cpuidex(int info[4], int, __int64) { memset(info, 0, 4*sizeof(int));}-
250#endif-
251-
252static void cpuidFeatures07_00(uint &ebx, uint &ecx)-
253{-
254#if defined(Q_CC_GNU)-
255 qregisteruint rbx; // in case it's 64-bit-
256 qregisteruint rcx = 0;-
257 asm ("xchg " PICreg", %0\n"-
258 "cpuid\n"-
259 "xchg " PICreg", %0\n"-
260 : "=&r" (rbx), "+&c" (rcx)-
261 : "a" (7)-
262 : "%edx");-
263 ebx = rbx;-
264 ecx = rcx;-
265#elif defined(Q_OS_WIN)-
266 int info[4];-
267 __cpuidex(info, 7, 0);-
268 ebx = info[1];-
269 ecx = info[2];-
270#elif defined(Q_CC_GHS)-
271 unsigned int info[4];-
272 __CPUIDEX(7, 0, info);-
273 ebx = info[1];-
274 ecx = info[2];-
275#endif-
276}
executed 1162 times by 97 tests: end of block
Executed by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
1162
277-
278#ifdef Q_OS_WIN-
279// fallback overload in case this intrinsic does not exist: unsigned __int64 _xgetbv(unsigned int);-
280inline quint64 _xgetbv(__int64) { return 0; }-
281#endif-
282static void xgetbv(uint in, uint &eax, uint &edx)-
283{-
284#if defined(Q_CC_GNU) || defined(Q_CC_GHS)-
285 asm (".byte 0x0F, 0x01, 0xD0" // xgetbv instruction-
286 : "=a" (eax), "=d" (edx)-
287 : "c" (in));-
288#elif defined(Q_OS_WIN)-
289 quint64 result = _xgetbv(in);-
290 eax = result;-
291 edx = result >> 32;-
292#endif-
293}
never executed: end of block
0
294-
295static quint64 detectProcessorFeatures()-
296{-
297 // Flags from the CR0 / XCR0 state register-
298 enum XCR0Flags {-
299 X87 = 1 << 0,-
300 XMM0_15 = 1 << 1,-
301 YMM0_15Hi128 = 1 << 2,-
302 BNDRegs = 1 << 3,-
303 BNDCSR = 1 << 4,-
304 OpMask = 1 << 5,-
305 ZMM0_15Hi256 = 1 << 6,-
306 ZMM16_31 = 1 << 7,-
307-
308 SSEState = XMM0_15,-
309 AVXState = XMM0_15 | YMM0_15Hi128,-
310 AVX512State = AVXState | OpMask | ZMM0_15Hi256 | ZMM16_31-
311 };-
312 static const quint64 AllAVX512 = (Q_UINT64_C(1) << CpuFeatureAVX512F) | (Q_UINT64_C(1) << CpuFeatureAVX512CD) |-
313 (Q_UINT64_C(1) << CpuFeatureAVX512ER) | (Q_UINT64_C(1) << CpuFeatureAVX512PF) |-
314 (Q_UINT64_C(1) << CpuFeatureAVX512BW) | (Q_UINT64_C(1) << CpuFeatureAVX512DQ) |-
315 (Q_UINT64_C(1) << CpuFeatureAVX512VL) |-
316 (Q_UINT64_C(1) << CpuFeatureAVX512IFMA) | (Q_UINT64_C(1) << CpuFeatureAVX512VBMI);-
317 static const quint64 AllAVX2 = (Q_UINT64_C(1) << CpuFeatureAVX2) | AllAVX512;-
318 static const quint64 AllAVX = (Q_UINT64_C(1) << CpuFeatureAVX) | AllAVX2;-
319-
320 quint64 features = 0;-
321 int cpuidLevel = maxBasicCpuidSupported();-
322#if Q_PROCESSOR_X86 < 5-
323 if (cpuidLevel < 1)-
324 return 0;-
325#else-
326 Q_ASSERT(cpuidLevel >= 1);-
327#endif-
328-
329 uint cpuid01ECX = 0, cpuid01EDX = 0;-
330 cpuidFeatures01(cpuid01ECX, cpuid01EDX);-
331-
332 // the low 32-bits of features is cpuid01ECX-
333 // note: we need to check OS support for saving the AVX register state-
334 features = cpuid01ECX;-
335-
336#if defined(Q_PROCESSOR_X86_32)-
337 // x86 might not have SSE2 support-
338 if (cpuid01EDX & (1u << 26))-
339 features |= Q_UINT64_C(1) << CpuFeatureSSE2;-
340 else-
341 features &= ~(Q_UINT64_C(1) << CpuFeatureSSE2);-
342 // we should verify that the OS enabled saving of the SSE state...-
343#else-
344 // x86-64 or x32-
345 features |= Q_UINT64_C(1) << CpuFeatureSSE2;-
346#endif-
347-
348 uint xgetbvA = 0, xgetbvD = 0;-
349 if (cpuid01ECX & (1u << 27)) {
cpuid01ECX & (1u << 27)Description
TRUEnever evaluated
FALSEevaluated 1162 times by 97 tests
Evaluated by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
0-1162
350 // XGETBV enabled-
351 xgetbv(0, xgetbvA, xgetbvD);-
352 }
never executed: end of block
0
353-
354 uint cpuid0700EBX = 0;-
355 uint cpuid0700ECX = 0;-
356 if (cpuidLevel >= 7) {
cpuidLevel >= 7Description
TRUEevaluated 1162 times by 97 tests
Evaluated by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
FALSEnever evaluated
0-1162
357 cpuidFeatures07_00(cpuid0700EBX, cpuid0700ECX);-
358-
359 // the high 32-bits of features is cpuid0700EBX-
360 features |= quint64(cpuid0700EBX) << 32;-
361 }
executed 1162 times by 97 tests: end of block
Executed by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
1162
362-
363 if ((xgetbvA & AVXState) != AVXState) {
(xgetbvA & AVX...e) != AVXStateDescription
TRUEevaluated 1162 times by 97 tests
Evaluated by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
FALSEnever evaluated
0-1162
364 // support for YMM registers is disabled, disable all AVX-
365 features &= ~AllAVX;-
366 } else if ((xgetbvA & AVX512State) != AVX512State) {
executed 1162 times by 97 tests: end of block
Executed by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
(xgetbvA & AVX...!= AVX512StateDescription
TRUEnever evaluated
FALSEnever evaluated
0-1162
367 // support for ZMM registers or mask registers is disabled, disable all AVX512-
368 features &= ~AllAVX512;-
369 } else {
never executed: end of block
0
370 // this feature is out of order-
371 if (cpuid0700ECX & (1u << 1))
cpuid0700ECX & (1u << 1)Description
TRUEnever evaluated
FALSEnever evaluated
0
372 features |= Q_UINT64_C(1) << CpuFeatureAVX512VBMI;
never executed: features |= static_cast<unsigned long long>(1ULL) << CpuFeatureAVX512VBMI;
0
373 else-
374 features &= ~(Q_UINT64_C(1) << CpuFeatureAVX512VBMI);
never executed: features &= ~(static_cast<unsigned long long>(1ULL) << CpuFeatureAVX512VBMI);
0
375 }-
376-
377 return features;
executed 1162 times by 97 tests: return features;
Executed by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
1162
378}-
379-
380#elif defined(Q_PROCESSOR_MIPS_32)-
381-
382#if defined(Q_OS_LINUX)-
383//-
384// Do not use QByteArray: it could use SIMD instructions itself at-
385// some point, thus creating a recursive dependency. Instead, use a-
386// QSimpleBuffer, which has the bare minimum needed to use memory-
387// dynamically and read lines from /proc/cpuinfo of arbitrary sizes.-
388//-
389struct QSimpleBuffer {-
390 static const int chunk_size = 256;-
391 char *data;-
392 unsigned alloc;-
393 unsigned size;-
394-
395 QSimpleBuffer(): data(0), alloc(0), size(0) {}-
396 ~QSimpleBuffer() { ::free(data); }-
397-
398 void resize(unsigned newsize) {-
399 if (newsize > alloc) {-
400 unsigned newalloc = chunk_size * ((newsize / chunk_size) + 1);-
401 if (newalloc < newsize) newalloc = newsize;-
402 if (newalloc != alloc) {-
403 data = static_cast<char*>(::realloc(data, newalloc));-
404 alloc = newalloc;-
405 }-
406 }-
407 size = newsize;-
408 }-
409 void append(const QSimpleBuffer &other, unsigned appendsize) {-
410 unsigned oldsize = size;-
411 resize(oldsize + appendsize);-
412 ::memcpy(data + oldsize, other.data, appendsize);-
413 }-
414 void popleft(unsigned amount) {-
415 if (amount >= size) return resize(0);-
416 size -= amount;-
417 ::memmove(data, data + amount, size);-
418 }-
419 char* cString() {-
420 if (!alloc) resize(1);-
421 return (data[size] = '\0', data);-
422 }-
423};-
424-
425//-
426// Uses a scratch "buffer" (which must be used for all reads done in the-
427// same file descriptor) to read chunks of data from a file, to read-
428// one line at a time. Lines include the trailing newline character ('\n').-
429// On EOF, line.size is zero.-
430//-
431static void bufReadLine(int fd, QSimpleBuffer &line, QSimpleBuffer &buffer)-
432{-
433 for (;;) {-
434 char *newline = static_cast<char*>(::memchr(buffer.data, '\n', buffer.size));-
435 if (newline) {-
436 unsigned piece_size = newline - buffer.data + 1;-
437 line.append(buffer, piece_size);-
438 buffer.popleft(piece_size);-
439 line.resize(line.size - 1);-
440 return;-
441 }-
442 if (buffer.size + QSimpleBuffer::chunk_size > buffer.alloc) {-
443 int oldsize = buffer.size;-
444 buffer.resize(buffer.size + QSimpleBuffer::chunk_size);-
445 buffer.size = oldsize;-
446 }-
447 ssize_t read_bytes = ::qt_safe_read(fd, buffer.data + buffer.size, QSimpleBuffer::chunk_size);-
448 if (read_bytes > 0) buffer.size += read_bytes;-
449 else return;-
450 }-
451}-
452-
453//-
454// Checks if any line with a given prefix from /proc/cpuinfo contains-
455// a certain string, surrounded by spaces.-
456//-
457static bool procCpuinfoContains(const char *prefix, const char *string)-
458{-
459 int cpuinfo_fd = ::qt_safe_open("/proc/cpuinfo", O_RDONLY);-
460 if (cpuinfo_fd == -1)-
461 return false;-
462-
463 unsigned string_len = ::strlen(string);-
464 unsigned prefix_len = ::strlen(prefix);-
465 QSimpleBuffer line, buffer;-
466 bool present = false;-
467 do {-
468 line.resize(0);-
469 bufReadLine(cpuinfo_fd, line, buffer);-
470 char *colon = static_cast<char*>(::memchr(line.data, ':', line.size));-
471 if (colon && line.size > prefix_len + string_len) {-
472 if (!::strncmp(prefix, line.data, prefix_len)) {-
473 // prefix matches, next character must be ':' or space-
474 if (line.data[prefix_len] == ':' || ::isspace(line.data[prefix_len])) {-
475 // Does it contain the string?-
476 char *found = ::strstr(line.cString(), string);-
477 if (found && ::isspace(found[-1]) &&-
478 (::isspace(found[string_len]) || found[string_len] == '\0')) {-
479 present = true;-
480 break;-
481 }-
482 }-
483 }-
484 }-
485 } while (line.size);-
486-
487 ::qt_safe_close(cpuinfo_fd);-
488 return present;-
489}-
490#endif-
491-
492static inline quint64 detectProcessorFeatures()-
493{-
494 // NOTE: MIPS 74K cores are the only ones supporting DSPr2.-
495 quint64 flags = 0;-
496-
497#if defined __mips_dsp-
498 flags |= Q_UINT64_C(1) << CpuFeatureDSP;-
499# if defined __mips_dsp_rev && __mips_dsp_rev >= 2-
500 flags |= Q_UINT64_C(1) << CpuFeatureDSPR2;-
501# elif defined(Q_OS_LINUX)-
502 if (procCpuinfoContains("cpu model", "MIPS 74Kc") || procCpuinfoContains("cpu model", "MIPS 74Kf"))-
503 flags |= Q_UINT64_C(1) << CpuFeatureDSPR2;-
504# endif-
505#elif defined(Q_OS_LINUX)-
506 if (procCpuinfoContains("ASEs implemented", "dsp")) {-
507 flags |= Q_UINT64_C(1) << CpuFeatureDSP;-
508 if (procCpuinfoContains("cpu model", "MIPS 74Kc") || procCpuinfoContains("cpu model", "MIPS 74Kf"))-
509 flags |= Q_UINT64_C(1) << CpuFeatureDSPR2;-
510 }-
511#endif-
512-
513 return flags;-
514}-
515-
516#else-
517static inline uint detectProcessorFeatures()-
518{-
519 return 0;-
520}-
521#endif-
522-
523/*-
524 * Use kdesdk/scripts/generate_string_table.pl to update the table below. Note-
525 * that the x86 version has a lot of blanks that must be kept and that the-
526 * offset table's type is changed to make the table smaller. We also remove the-
527 * terminating -1 that the script adds.-
528 */-
529-
530// begin generated-
531#if defined(Q_PROCESSOR_ARM)-
532/* Data:-
533 neon-
534 crc32-
535 */-
536static const char features_string[] =-
537 " neon\0"-
538 " crc32\0"-
539 "\0";-
540static const int features_indices[] = { 0, 6 };-
541#elif defined(Q_PROCESSOR_MIPS)-
542/* Data:-
543 dsp-
544 dspr2-
545*/-
546static const char features_string[] =-
547 " dsp\0"-
548 " dspr2\0"-
549 "\0";-
550-
551static const int features_indices[] = {-
552 0, 5-
553};-
554#elif defined(Q_PROCESSOR_X86)-
555/* Data:-
556 sse3-
557 sse2-
558 avx512vbmi-
559-
560-
561-
562-
563-
564-
565 ssse3-
566-
567-
568 fma-
569 cmpxchg16b-
570-
571-
572-
573-
574-
575 sse4.1-
576 sse4.2-
577-
578 movbe-
579 popcnt-
580-
581 aes-
582-
583-
584 avx-
585 f16c-
586 rdrand-
587-
588-
589-
590-
591 bmi-
592 hle-
593 avx2-
594-
595-
596 bmi2-
597-
598-
599 rtm-
600-
601-
602-
603-
604 avx512f-
605 avx512dq-
606 rdseed-
607-
608-
609 avx512ifma-
610-
611-
612-
613-
614 avx512pf-
615 avx512er-
616 avx512cd-
617 sha-
618 avx512bw-
619 avx512vl-
620 */-
621static const char features_string[] =-
622 " sse3\0"-
623 " sse2\0"-
624 " avx512vbmi\0"-
625 " ssse3\0"-
626 " fma\0"-
627 " cmpxchg16b\0"-
628 " sse4.1\0"-
629 " sse4.2\0"-
630 " movbe\0"-
631 " popcnt\0"-
632 " aes\0"-
633 " avx\0"-
634 " f16c\0"-
635 " rdrand\0"-
636 " bmi\0"-
637 " hle\0"-
638 " avx2\0"-
639 " bmi2\0"-
640 " rtm\0"-
641 " avx512f\0"-
642 " avx512dq\0"-
643 " rdseed\0"-
644 " avx512ifma\0"-
645 " avx512pf\0"-
646 " avx512er\0"-
647 " avx512cd\0"-
648 " sha\0"-
649 " avx512bw\0"-
650 " avx512vl\0"-
651 "\0";-
652-
653static const quint8 features_indices[] = {-
654 0, 6, 12, 5, 5, 5, 5, 5,-
655 5, 24, 5, 5, 31, 36, 5, 5,-
656 5, 5, 5, 48, 56, 5, 64, 71,-
657 5, 79, 5, 5, 84, 89, 95, 5,-
658 5, 5, 5, 103, 108, 113, 5, 5,-
659 119, 5, 5, 125, 5, 5, 5, 5,-
660 130, 139, 149, 5, 5, 157, 5, 5,-
661 5, 5, 169, 179, 189, 199, 204, 214-
662};-
663#else-
664static const char features_string[] = "";-
665static const int features_indices[] = { };-
666#endif-
667// end generated-
668-
669static const int features_count = (sizeof features_indices) / (sizeof features_indices[0]);-
670-
671// record what CPU features were enabled by default in this Qt build-
672static const quint64 minFeature = qCompilerCpuFeatures;-
673-
674#ifdef Q_ATOMIC_INT64_IS_SUPPORTED-
675Q_CORE_EXPORT QBasicAtomicInteger<quint64> qt_cpu_features[1] = { Q_BASIC_ATOMIC_INITIALIZER(0) };-
676#else-
677Q_CORE_EXPORT QBasicAtomicInteger<unsigned> qt_cpu_features[2] = { Q_BASIC_ATOMIC_INITIALIZER(0), Q_BASIC_ATOMIC_INITIALIZER(0) };-
678#endif-
679-
680void qDetectCpuFeatures()-
681{-
682#if defined(Q_CC_GNU) && !defined(Q_CC_CLANG) && !defined(Q_CC_INTEL)-
683# if Q_CC_GNU < 403-
684 // GCC 4.2 (at least the one that comes with Apple's XCode, on Mac) is-
685 // known to be broken beyond repair in dealing with the inline assembly-
686 // above. It will generate bad code that could corrupt important registers-
687 // like the PIC register. The behaviour of code after this function would-
688 // be totally unpredictable.-
689 //-
690 // For that reason, simply forego the CPUID check at all and return the set-
691 // of features that we found at compile time, through the #defines from the-
692 // compiler. This should at least allow code to execute, even if none of-
693 // the specialized code found in Qt GUI and elsewhere will ever be enabled-
694 // (it's the user's fault for using a broken compiler).-
695 //-
696 // This also disables the runtime checking that the processor actually-
697 // contains all the features that the code required. Qt 4 ran for years-
698 // like that, so it shouldn't be a problem.-
699-
700 qt_cpu_features[0].store(minFeature | quint32(QSimdInitialized));-
701#ifndef Q_ATOMIC_INT64_IS_SUPPORTED-
702 qt_cpu_features[1].store(minFeature >> 32);-
703#endif-
704-
705 return;-
706# endif-
707#endif-
708 quint64 f = detectProcessorFeatures();-
709 QByteArray disable = qgetenv("QT_NO_CPU_FEATURE");-
710 if (!disable.isEmpty()) {
!disable.isEmpty()Description
TRUEnever evaluated
FALSEevaluated 1162 times by 97 tests
Evaluated by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
0-1162
711 disable.prepend(' ');-
712 for (int i = 0; i < features_count; ++i) {
i < features_countDescription
TRUEnever evaluated
FALSEnever evaluated
0
713 if (disable.contains(features_string + features_indices[i]))
disable.contai...es_indices[i])Description
TRUEnever evaluated
FALSEnever evaluated
0
714 f &= ~(Q_UINT64_C(1) << i);
never executed: f &= ~(static_cast<unsigned long long>(1ULL) << i);
0
715 }
never executed: end of block
0
716 }
never executed: end of block
0
717-
718#ifdef RUNNING_ON_VALGRIND-
719 bool runningOnValgrind = RUNNING_ON_VALGRIND;-
720#else-
721 bool runningOnValgrind = false;-
722#endif-
723 if (Q_UNLIKELY(!runningOnValgrind && minFeature != 0 && (f & minFeature) != minFeature)) {
__builtin_expe...ature), false)Description
TRUEnever evaluated
FALSEevaluated 1162 times by 97 tests
Evaluated by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
0-1162
724 quint64 missing = minFeature & ~f;-
725 fprintf(stderr, "Incompatible processor. This Qt build requires the following features:\n ");-
726 for (int i = 0; i < features_count; ++i) {
i < features_countDescription
TRUEnever evaluated
FALSEnever evaluated
0
727 if (missing & (Q_UINT64_C(1) << i))
missing & (sta...g>(1ULL) << i)Description
TRUEnever evaluated
FALSEnever evaluated
0
728 fprintf(stderr, "%s", features_string + features_indices[i]);
never executed: fprintf(stderr, "%s", features_string + features_indices[i]);
0
729 }
never executed: end of block
0
730 fprintf(stderr, "\n");-
731 fflush(stderr);-
732 qFatal("Aborted. Incompatible processor: missing feature 0x%llx -%s.", missing,-
733 features_string + features_indices[qCountTrailingZeroBits(missing)]);-
734 }
never executed: end of block
0
735-
736 qt_cpu_features[0].store(f | quint32(QSimdInitialized));-
737#ifndef Q_ATOMIC_INT64_IS_SUPPORTED-
738 qt_cpu_features[1].store(f >> 32);-
739#endif-
740}
executed 1162 times by 97 tests: end of block
Executed by:
  • tst_Collections
  • tst_QAbstractFileEngine
  • tst_QAbstractItemModel
  • tst_QAnimationGroup
  • tst_QAuthenticator
  • tst_QByteArray
  • tst_QCache
  • tst_QCommandLineParser
  • tst_QDBusAbstractInterface
  • tst_QDBusConnection
  • tst_QDBusConnectionNoBus
  • tst_QDBusConnectionNoLibDBus1
  • tst_QDBusConnection_Delayed
  • tst_QDBusConnection_NoApplication
  • tst_QDBusConnection_SpyHook
  • tst_QDBusContext
  • tst_QDBusInterface
  • tst_QDBusMetaObject
  • tst_QDBusServiceWatcher
  • tst_QDBusThreading
  • tst_QDBusXmlParser
  • tst_QDate
  • tst_QDateTime
  • tst_QDebug
  • tst_QDir
  • ...
1162
741-
742void qDumpCPUFeatures()-
743{-
744 quint64 features = qCpuFeatures() & ~quint64(QSimdInitialized);-
745 printf("Processor features: ");-
746 for (int i = 0; i < features_count; ++i) {
i < features_countDescription
TRUEnever evaluated
FALSEnever evaluated
0
747 if (features & (Q_UINT64_C(1) << i))
features & (st...g>(1ULL) << i)Description
TRUEnever evaluated
FALSEnever evaluated
0
748 printf("%s%s", features_string + features_indices[i],
never executed: printf("%s%s", features_string + features_indices[i], minFeature & (static_cast<unsigned long long>(1ULL) << i) ? "[required]" : "");
0
749 minFeature & (Q_UINT64_C(1) << i) ? "[required]" : "");
never executed: printf("%s%s", features_string + features_indices[i], minFeature & (static_cast<unsigned long long>(1ULL) << i) ? "[required]" : "");
0
750 }
never executed: end of block
0
751 puts("");-
752}
never executed: end of block
0
753-
754QT_END_NAMESPACE-
Source codeSwitch to Preprocessed file
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