diff options
Diffstat (limited to 'src/corelib/global/qendian.h')
| -rw-r--r-- | src/corelib/global/qendian.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/corelib/global/qendian.h b/src/corelib/global/qendian.h index 7c643f7592..0e383c18d2 100644 --- a/src/corelib/global/qendian.h +++ b/src/corelib/global/qendian.h @@ -272,9 +272,15 @@ template <> inline qint8 qFromBigEndian<qint8>(const uchar *src) */ template <typename T> T qbswap(T source); +#ifdef __has_builtin +# define QT_HAS_BUILTIN(x) __has_builtin(x) +#else +# define QT_HAS_BUILTIN(x) 0 +#endif + // GCC 4.3 implemented all the intrinsics, but the 16-bit one only got implemented in 4.8; // Clang 2.6 implemented the 32- and 64-bit but waited until 3.2 to implement the 16-bit one -#if (defined(Q_CC_GNU) && Q_CC_GNU >= 403) || (defined(Q_CC_CLANG) && Q_CC_CLANG >= 206) +#if (defined(Q_CC_GNU) && Q_CC_GNU >= 403) || QT_HAS_BUILTIN(__builtin_bswap32) template <> inline quint64 qbswap<quint64>(quint64 source) { return __builtin_bswap64(source); @@ -306,7 +312,7 @@ template <> inline quint32 qbswap<quint32>(quint32 source) | ((source & 0xff000000) >> 24); } #endif // GCC & Clang intrinsics -#if (defined(Q_CC_GNU) && Q_CC_GNU >= 408) || (defined(Q_CC_CLANG) && Q_CC_CLANG >= 302) +#if (defined(Q_CC_GNU) && Q_CC_GNU >= 408) || QT_HAS_BUILTIN(__builtin_bswap16) template <> inline quint16 qbswap<quint16>(quint16 source) { return __builtin_bswap16(source); @@ -320,6 +326,8 @@ template <> inline quint16 qbswap<quint16>(quint16 source) } #endif // GCC & Clang intrinsics +#undef QT_HAS_BUILTIN + // signed specializations template <> inline qint64 qbswap<qint64>(qint64 source) { |