diff options
| -rw-r--r-- | src/corelib/tools/qalgorithms.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/corelib/tools/qalgorithms.h b/src/corelib/tools/qalgorithms.h index 2658cfc2c2..fecb9120eb 100644 --- a/src/corelib/tools/qalgorithms.h +++ b/src/corelib/tools/qalgorithms.h @@ -518,28 +518,43 @@ Q_OUTOFLINE_TEMPLATE RandomAccessIterator qBinaryFindHelper(RandomAccessIterator Q_DECL_CONSTEXPR inline uint qPopulationCount(quint32 v) { +#ifdef Q_CC_GNU + return __builtin_popcount(v); +#else // See http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel return (((v ) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f + (((v >> 12) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f + (((v >> 24) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f; +#endif } Q_DECL_CONSTEXPR inline uint qPopulationCount(quint8 v) { +#ifdef Q_CC_GNU + return __builtin_popcount(v); +#else return (((v ) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f; +#endif } Q_DECL_CONSTEXPR inline uint qPopulationCount(quint16 v) { +#ifdef Q_CC_GNU + return __builtin_popcount(v); +#else return (((v ) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f + (((v >> 12) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f; +#endif } Q_DECL_CONSTEXPR inline uint qPopulationCount(quint64 v) { +#ifdef Q_CC_GNU + return __builtin_popcountll(v); +#else return (((v ) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f + (((v >> 12) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f + @@ -547,6 +562,7 @@ Q_DECL_CONSTEXPR inline uint qPopulationCount(quint64 v) (((v >> 36) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f + (((v >> 48) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f + (((v >> 60) & 0xfff) * Q_UINT64_C(0x1001001001001) & Q_UINT64_C(0x84210842108421)) % 0x1f; +#endif } Q_DECL_CONSTEXPR inline uint qPopulationCount(long unsigned int v) |