2 files changed, 19 insertions, 0 deletions
diff --git a/src/corelib/global/qfloat16.cpp b/src/corelib/global/qfloat16.cpp
index b8e7cbe928..376d6440e0 100644
--- a/src/corelib/global/qfloat16.cpp
+++ b/src/corelib/global/qfloat16.cpp
@@ -363,6 +363,20 @@ Q_CORE_EXPORT void qFloatFromFloat16(float *out, const qfloat16 *in, qsizetype l
         out[i] = float(in[i]);
 }
 
+/*!
+    \fn size_t qfloat16::qHash(qfloat16 key, size_t seed)
+    \since 6.5.4
+    \relates qfloat16
+
+    Returns the hash value for the \a key, using \a seed to seed the
+    calculation.
+
+    \note In Qt versions before 6.5, this operation was provided by the
+    qHash(float) overload. In Qt versions 6.5.0 to 6.5.3, this functionality
+    was broken in various ways. In Qt versions 6.5.4 and 6.6 onwards, this
+    overload restores the Qt 6.4 behavior.
+*/
+
 #ifndef QT_NO_DATASTREAM
 /*!
     \fn qfloat16::operator<<(QDataStream &ds, qfloat16 f)
diff --git a/src/corelib/global/qfloat16.h b/src/corelib/global/qfloat16.h
index d6a3ac164e..06542c4b4d 100644
--- a/src/corelib/global/qfloat16.h
+++ b/src/corelib/global/qfloat16.h
@@ -6,8 +6,10 @@
 #define QFLOAT16_H
 
 #include <QtCore/qglobal.h>
+#include <QtCore/qhashfunctions.h>
 #include <QtCore/qmath.h>
 #include <QtCore/qnamespace.h>
+
 #include <limits>
 #include <string.h>
 
@@ -144,6 +146,9 @@ private:
     friend inline qfloat16 operator*(qfloat16 a, qfloat16 b) noexcept { return qfloat16(static_cast<NearestFloat>(a) * static_cast<NearestFloat>(b)); }
     friend inline qfloat16 operator/(qfloat16 a, qfloat16 b) noexcept { return qfloat16(static_cast<NearestFloat>(a) / static_cast<NearestFloat>(b)); }
 
+    friend size_t qHash(qfloat16 key, size_t seed = 0) noexcept
+    { return qHash(float(key), seed); } // 6.4 algorithm, so keep using it; ### Qt 7: fix QTBUG-116077
+
 #define QF16_MAKE_ARITH_OP_FP(FP, OP) \
     friend inline FP operator OP(qfloat16 lhs, FP rhs) noexcept { return static_cast<FP>(lhs) OP rhs; } \
     friend inline FP operator OP(FP lhs, qfloat16 rhs) noexcept { return lhs OP static_cast<FP>(rhs); }