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Boost performance of QChar::isLetterOrNumber

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Make it inline; add fast checks for ascii letters
and digits; add fallback function that uses the
fastcall calling convention.

On ia32, this change makes isLetterOrNumber ~120x
faster for ascii letters and digits, ~150x faster
for non-letter/digit ascii characters, and ~1.3x
faster for non-ascii characters.

Note that this change is NOT binary compatible.

Also add an autotest with expected results from
before the optimization, to ensure that the
behavior is the same.

Change-Id: Ia4e13692f4dd79f6aa0b96da29449e0487971b0e
Reviewed-on: http://codereview.qt-project.org/4904
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
This commit is contained in:
Kent Hansen 2011-09-14 13:50:36 +02:00 committed by Qt by Nokia
parent a48e9af146
commit 08d1ca1053
3 changed files with 41 additions and 3 deletions
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11
src/corelib/tools/qchar.cpp
View File

@ -591,10 +591,17 @@ bool QChar::isNumber() const
}
/*!
\fn bool QChar::isLetterOrNumber() const
Returns true if the character is a letter or number (Letter_* or
Number_* categories); otherwise returns false.
*/
bool QChar::isLetterOrNumber() const
/*!
\internal
\overload
*/
bool QChar::isLetterOrNumber(ushort ucs2)
{
const int test = FLAG(Letter_Uppercase) |
FLAG(Letter_Lowercase) |
@ -604,7 +611,7 @@ bool QChar::isLetterOrNumber() const
FLAG(Number_DecimalDigit) |
FLAG(Number_Letter) |
FLAG(Number_Other);
return FLAG(qGetProp(ucs)->category) & test;
return FLAG(qGetProp(ucs2)->category) & test;
}
/*!

9
src/corelib/tools/qchar.h
View File

@ -240,7 +240,13 @@ public:
|| (ucs > 127 && isLetter(ucs));
}
bool isNumber() const;
bool isLetterOrNumber() const;
inline bool isLetterOrNumber() const
{
return (ucs >= 'a' && ucs <= 'z')
|| (ucs <= 'Z' && ucs >= 'A')
|| (ucs <= '9' && ucs >= '0')
|| (ucs > 127 && isLetterOrNumber(ucs));
}
inline bool isDigit() const
{ return (ucs <= '9' && ucs >= '0') || (ucs > 127 && isDigit(ucs)); }
bool isSymbol() const;
@ -322,6 +328,7 @@ public:
private:
static bool QT_FASTCALL isDigit(ushort ucs2);
static bool QT_FASTCALL isLetter(ushort ucs2);
static bool QT_FASTCALL isLetterOrNumber(ushort ucs2);
#ifdef QT_NO_CAST_FROM_ASCII
QChar(char c);

24
tests/auto/corelib/tools/qchar/tst_qchar.cpp
View File

@ -77,6 +77,8 @@ private slots:
void isDigit();
void isLetter_data();
void isLetter();
void isLetterOrNumber_data();
void isLetterOrNumber();
void isPrint();
void isUpper();
void isLower();
@ -273,6 +275,28 @@ void tst_QChar::isLetter()
QCOMPARE(QChar(ucs).isLetter(), expected);
}
void tst_QChar::isLetterOrNumber_data()
{
QTest::addColumn<ushort>("ucs");
QTest::addColumn<bool>("expected");
for (ushort ucs = 0; ucs < 256; ++ucs) {
bool isLetterOrNumber = isExpectedLetter(ucs)
|| (ucs >= '0' && ucs <= '9')
|| ucs == 0xB2 || ucs == 0xB3 || ucs == 0xB9
|| (ucs >= 0xBC && ucs <= 0xBE);
QString tag = QString::fromLatin1("0x%0").arg(QString::number(ucs, 16));
QTest::newRow(tag.toLatin1()) << ucs << isLetterOrNumber;
}
}
void tst_QChar::isLetterOrNumber()
{
QFETCH(ushort, ucs);
QFETCH(bool, expected);
QCOMPARE(QChar(ucs).isLetterOrNumber(), expected);
}
void tst_QChar::isPrint()
{
QVERIFY(QChar('A').isPrint());