diff options
| -rw-r--r-- | tests/benchmarks/corelib/tools/qstring/main.cpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/tests/benchmarks/corelib/tools/qstring/main.cpp b/tests/benchmarks/corelib/tools/qstring/main.cpp index a23244d..3d88756 100644 --- a/tests/benchmarks/corelib/tools/qstring/main.cpp +++ b/tests/benchmarks/corelib/tools/qstring/main.cpp @@ -67,6 +67,8 @@ private slots: void equals_data() const; void equals2_data() const; void equals2() const; + void ucstrncmp_data() const; + void ucstrncmp() const; void fromUtf8() const; }; @@ -835,6 +837,140 @@ void tst_QString::equals2() const } } +static int ucstrncmp_shortwise(const ushort *a, const ushort *b, int l) +{ + while (l-- && *a == *b) + a++,b++; + if (l==-1) + return 0; + return *a - *b; +} + +static int ucstrncmp_intwise(const ushort *a, const ushort *b, int len) +{ + // do both strings have the same alignment? + if ((quintptr(a) & 2) == (quintptr(b) & 2)) { + // are we aligned to 4 bytes? + if (quintptr(a) & 2) { + if (*a != *b) + return *a - *b; + ++a; + ++b; + --len; + } + + const uint *p1 = (const uint *)a; + const uint *p2 = (const uint *)b; + quintptr counter = 0; + for ( ; len > 1 ; len -= 2, ++counter) { + if (p1[counter] != p2[counter]) { + // which ushort isn't equal? + int diff = a[2*counter] - b[2*counter]; + return diff ? diff : a[2*counter + 1] - b[2*counter + 1]; + } + } + + return len ? a[2*counter] - b[2*counter] : 0; + } else { + while (len-- && *a == *b) + a++,b++; + if (len==-1) + return 0; + return *a - *b; + } +} + +typedef int (* UcstrncmpFunction)(const ushort *, const ushort *, int); +Q_DECLARE_METATYPE(UcstrncmpFunction) + +void tst_QString::ucstrncmp_data() const +{ + QTest::addColumn<UcstrncmpFunction>("function"); + QTest::newRow("selftest") << UcstrncmpFunction(0); + QTest::newRow("shortwise") << &ucstrncmp_shortwise; + QTest::newRow("intwise") << &ucstrncmp_intwise; +} + +void tst_QString::ucstrncmp() const +{ + QFETCH(UcstrncmpFunction, function); + if (!function) { + static const UcstrncmpFunction func[] = { + &ucstrncmp_shortwise, + &ucstrncmp_intwise + }; + static const int functionCount = sizeof func / sizeof func[0]; + +#ifdef Q_OS_UNIX + const long pagesize = sysconf(_SC_PAGESIZE); + void *page1, *page3; + ushort *page2; + page1 = mmap(0, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + page2 = (ushort *)mmap(0, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, -1, 0); + page3 = mmap(0, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + + Q_ASSERT(quintptr(page2) == quintptr(page1) + pagesize || quintptr(page2) == quintptr(page1) - pagesize); + Q_ASSERT(quintptr(page3) == quintptr(page2) + pagesize || quintptr(page3) == quintptr(page2) - pagesize); + munmap(page1, pagesize); + munmap(page3, pagesize); + + // populate our page + for (uint i = 0; i < pagesize / sizeof(long long); ++i) + ((long long *)page2)[i] = Q_INT64_C(0x0041004100410041); + + // the following should crash: + //page2[-1] = 0xdead; + //page2[pagesize / sizeof(ushort) + 1] = 0xbeef; + + static const ushort needle[] = { + 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, + 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, + 0x41 + }; + + for (int algo = 0; algo < functionCount; ++algo) { + // boundary condition test: + for (int i = 0; i < 8; ++i) { + (func[algo])(page2 + i, needle, sizeof needle / 2); + (func[algo])(page2 - i - 1 - sizeof(needle)/2 + pagesize/2, needle, sizeof needle/2); + } + } + + munmap(page2, pagesize); +#endif + + for (int algo = 0; algo < functionCount; ++algo) { + for (int i = 0; i < stringCollectionCount; ++i) { + const ushort *p1 = stringCollectionData + stringCollection[i].offset1; + const ushort *p2 = stringCollectionData + stringCollection[i].offset2; + int expected = ucstrncmp_shortwise(p1, p2, stringCollection[i].len); + expected = qBound(-1, expected, 1); + + int result = (func[algo])(p1, p2, stringCollection[i].len); + result = qBound(-1, result, 1); + if (expected != result) + qWarning().nospace() + << "algo=" << algo + << " i=" << i + << " failed (" << result << "!=" << expected + << "); strings were " + << QByteArray((char*)p1, stringCollection[i].len).toHex() + << " and " + << QByteArray((char*)p2, stringCollection[i].len).toHex(); + } + } + return; + } + + QBENCHMARK { + for (int i = 0; i < stringCollectionCount; ++i) { + const ushort *p1 = stringCollectionData + stringCollection[i].offset1; + const ushort *p2 = stringCollectionData + stringCollection[i].offset2; + (function)(p1, p2, stringCollection[i].len); + } + } +} + void tst_QString::fromUtf8() const { QFile file(SRCDIR "utf-8.txt"); |