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use compiler built-ins for byte swapping

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for reference:
https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
https://clang.llvm.org/docs/LanguageExtensions.html

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2021-01-06 09:12:40 +02:00
parent cda92e3f7d
commit 8a9f064ede
1 changed files with 3 additions and 38 deletions
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41
src/core/global/qendian.h
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@ -36,10 +36,6 @@
#include <QtCore/qglobal.h>
#ifdef __GLIBC__
#include <byteswap.h>
#endif
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
@ -165,49 +161,18 @@ template <> inline qint16 qFromBigEndian<qint16>(const uchar *src)
*/
template <typename T> T qbswap(const T source);
#ifdef __GLIBC__
template <> inline quint64 qbswap<quint64>(const quint64 source)
{
return bswap_64(source);
return __builtin_bswap64(source);
}
template <> inline quint32 qbswap<quint32>(const quint32 source)
{
return bswap_32(source);
return __builtin_bswap32(source);
}
template <> inline quint16 qbswap<quint16>(const quint16 source)
{
return bswap_16(source);
return __builtin_bswap16(source);
}
#else
template <> inline quint64 qbswap<quint64>(const quint64 source)
{
return 0
| ((source & Q_UINT64_C(0x00000000000000ff)) << 56)
| ((source & Q_UINT64_C(0x000000000000ff00)) << 40)
| ((source & Q_UINT64_C(0x0000000000ff0000)) << 24)
| ((source & Q_UINT64_C(0x00000000ff000000)) << 8)
| ((source & Q_UINT64_C(0x000000ff00000000)) >> 8)
| ((source & Q_UINT64_C(0x0000ff0000000000)) >> 24)
| ((source & Q_UINT64_C(0x00ff000000000000)) >> 40)
| ((source & Q_UINT64_C(0xff00000000000000)) >> 56);
}
template <> inline quint32 qbswap<quint32>(const quint32 source)
{
return 0
| ((source & 0x000000ff) << 24)
| ((source & 0x0000ff00) << 8)
| ((source & 0x00ff0000) >> 8)
| ((source & 0xff000000) >> 24);
}
template <> inline quint16 qbswap<quint16>(const quint16 source)
{
return quint16( 0
| ((source & 0x00ff) << 8)
| ((source & 0xff00) >> 8) );
}
#endif // __GLIBC__
// signed specializations
template <> inline qint64 qbswap<qint64>(const qint64 source)