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enh(Ascii): improve performance for toLower/toUpper #3462

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This commit is contained in:
Aleksandar Fabijanic
2023-11-26 18:56:54 -06:00
parent 1f4d575465
commit cc67fb36ea
2 changed files with 54 additions and 14 deletions
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4
Foundation/include/Poco/Ascii.h
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@@ -208,7 +208,7 @@ inline bool Ascii::isPrintable(int ch)
inline int Ascii::toLower(int ch) inline int Ascii::toLower(int ch)
{ {
if (isUpper(ch)) if (isUpper(ch))
return ch + 32; return ch | 0x20;
else else
return ch; return ch;
} }
@@ -217,7 +217,7 @@ inline int Ascii::toLower(int ch)
inline int Ascii::toUpper(int ch) inline int Ascii::toUpper(int ch)
{ {
if (isLower(ch)) if (isLower(ch))
return ch - 32; return ch & ~0x20;
else else
return ch; return ch;
} }

64
Foundation/include/Poco/String.h
View File

@@ -116,12 +116,22 @@ template <class S>
S toUpper(const S& str) S toUpper(const S& str)
/// Returns a copy of str containing all upper-case characters. /// Returns a copy of str containing all upper-case characters.
{ {
typename S::const_iterator it = str.begin(); S result(str);
typename S::const_iterator end = str.end();
S result; typename S::iterator it = result.begin();
result.reserve(str.size()); typename S::iterator end = result.end();
while (it != end) result += static_cast<typename S::value_type>(Ascii::toUpper(*it++));
#if defined(__clang__) && ((__clang_major__ > 3) || (__clang_major__ == 3 && __clang_minor__ >= 6))
# pragma clang loop unroll(enable)
#elif defined(POCO_MSVS_VERSION) && (POCO_MSVS_VERSION >= 2017)
# pragma loop(hint_parallel(0))
#endif
while (it != end)
{
int ch = static_cast<unsigned char>(*it);
*it = static_cast<typename S::value_type>(Ascii::toUpper(ch));
++it;
}
return result; return result;
} }
@@ -133,7 +143,17 @@ S& toUpperInPlace(S& str)
typename S::iterator it = str.begin(); typename S::iterator it = str.begin();
typename S::iterator end = str.end(); typename S::iterator end = str.end();
while (it != end) { *it = static_cast<typename S::value_type>(Ascii::toUpper(*it)); ++it; } #if defined(__clang__) && ((__clang_major__ > 3) || (__clang_major__ == 3 && __clang_minor__ >= 6))
# pragma clang loop unroll(enable)
#elif defined(POCO_MSVS_VERSION) && (POCO_MSVS_VERSION >= 2017)
# pragma loop(hint_parallel(0))
#endif
while (it != end)
{
int ch = static_cast<unsigned char>(*it);
*it = static_cast<typename S::value_type>(Ascii::toUpper(ch));
++it;
}
return str; return str;
} }
@@ -142,12 +162,22 @@ template <class S>
S toLower(const S& str) S toLower(const S& str)
/// Returns a copy of str containing all lower-case characters. /// Returns a copy of str containing all lower-case characters.
{ {
typename S::const_iterator it = str.begin(); S result(str);
typename S::const_iterator end = str.end();
S result; typename S::iterator it = result.begin();
result.reserve(str.size()); typename S::iterator end = result.end();
while (it != end) result += static_cast<typename S::value_type>(Ascii::toLower(*it++));
#if defined(__clang__) && ((__clang_major__ > 3) || (__clang_major__ == 3 && __clang_minor__ >= 6))
# pragma clang loop unroll(enable)
#elif defined(POCO_MSVS_VERSION) && (POCO_MSVS_VERSION >= 2017)
# pragma loop(hint_parallel(0))
#endif
while (it != end)
{
int ch = static_cast<unsigned char>(*it);
*it = static_cast<typename S::value_type>(Ascii::toLower(ch));
++it;
}
return result; return result;
} }
@@ -159,7 +189,17 @@ S& toLowerInPlace(S& str)
typename S::iterator it = str.begin(); typename S::iterator it = str.begin();
typename S::iterator end = str.end(); typename S::iterator end = str.end();
while (it != end) { *it = static_cast<typename S::value_type>(Ascii::toLower(*it)); ++it; } #if defined(__clang__) && ((__clang_major__ > 3) || (__clang_major__ == 3 && __clang_minor__ >= 6))
# pragma clang loop unroll(enable)
#elif defined(POCO_MSVS_VERSION) && (POCO_MSVS_VERSION >= 2017)
# pragma loop(hint_parallel(0))
#endif
while (it != end)
{
int ch = static_cast<unsigned char>(*it);
*it = static_cast<typename S::value_type>(Ascii::toLower(ch));
++it;
}
return str; return str;
} }