Manual implementation

base/base/BFloat16.h

@@ -1,22 +1,294 @@
 #pragma once
 
-#include <base/bit_cast.h>
+#include <bit>
+#include <base/types.h>
 
 
-using BFloat16 = __bf16;
+//using BFloat16 = __bf16;
+
+class BFloat16
+{
+private:
+    UInt16 x = 0;
+
+public:
+    constexpr BFloat16() = default;
+    constexpr BFloat16(const BFloat16 & other) = default;
+    constexpr BFloat16 & operator=(const BFloat16 & other) = default;
+
+    explicit constexpr BFloat16(const Float32 & other)
+    {
+        x = static_cast<UInt16>(std::bit_cast<UInt32>(other) >> 16);
+    }
+
+    template <typename T>
+    explicit constexpr BFloat16(const T & other)
+        : BFloat16(Float32(other))
+    {
+    }
+
+    template <typename T>
+    constexpr BFloat16 & operator=(const T & other)
+    {
+        *this = BFloat16(other);
+        return *this;
+    }
+
+    explicit constexpr operator Float32() const
+    {
+        return std::bit_cast<Float32>(static_cast<UInt32>(x) << 16);
+    }
+
+    template <typename T>
+    explicit constexpr operator T() const
+    {
+        return T(Float32(*this));
+    }
+
+    constexpr bool isFinite() const
+    {
+        return (x & 0b0111111110000000) != 0b0111111110000000;
+    }
+
+    constexpr bool isNaN() const
+    {
+        return !isFinite() && (x & 0b0000000001111111) != 0b0000000000000000;
+    }
+
+    constexpr bool signBit() const
+    {
+        return x & 0b1000000000000000;
+    }
+
+    constexpr bool operator==(const BFloat16 & other) const
+    {
+        return x == other.x;
+    }
+
+    constexpr bool operator!=(const BFloat16 & other) const
+    {
+        return x != other.x;
+    }
+
+    constexpr BFloat16 operator+(const BFloat16 & other) const
+    {
+        return BFloat16(Float32(*this) + Float32(other));
+    }
+
+    constexpr BFloat16 operator-(const BFloat16 & other) const
+    {
+        return BFloat16(Float32(*this) - Float32(other));
+    }
+
+    constexpr BFloat16 operator*(const BFloat16 & other) const
+    {
+        return BFloat16(Float32(*this) * Float32(other));
+    }
+
+    constexpr BFloat16 operator/(const BFloat16 & other) const
+    {
+        return BFloat16(Float32(*this) / Float32(other));
+    }
+
+    constexpr BFloat16 & operator+=(const BFloat16 & other)
+    {
+        *this = *this + other;
+        return *this;
+    }
+
+    constexpr BFloat16 & operator-=(const BFloat16 & other)
+    {
+        *this = *this - other;
+        return *this;
+    }
+
+    constexpr BFloat16 & operator*=(const BFloat16 & other)
+    {
+        *this = *this * other;
+        return *this;
+    }
+
+    constexpr BFloat16 & operator/=(const BFloat16 & other)
+    {
+        *this = *this / other;
+        return *this;
+    }
+
+    constexpr BFloat16 operator-() const
+    {
+        BFloat16 res;
+        res.x = x ^ 0b1000000000000000;
+        return res;
+    }
+};
+
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator==(const BFloat16 & a, const T & b)
+{
+    return Float32(a) == b;
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator==(const T & a, const BFloat16 & b)
+{
+    return a == Float32(b);
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator!=(const BFloat16 & a, const T & b)
+{
+    return Float32(a) != b;
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator!=(const T & a, const BFloat16 & b)
+{
+    return a != Float32(b);
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator<(const BFloat16 & a, const T & b)
+{
+    return Float32(a) < b;
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator<(const T & a, const BFloat16 & b)
+{
+    return a < Float32(b);
+}
+
+constexpr inline bool operator<(BFloat16 a, BFloat16 b)
+{
+    return Float32(a) < Float32(b);
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator>(const BFloat16 & a, const T & b)
+{
+    return Float32(a) > b;
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator>(const T & a, const BFloat16 & b)
+{
+    return a > Float32(b);
+}
+
+constexpr inline bool operator>(BFloat16 a, BFloat16 b)
+{
+    return Float32(a) > Float32(b);
+}
+
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator<=(const BFloat16 & a, const T & b)
+{
+    return Float32(a) <= b;
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator<=(const T & a, const BFloat16 & b)
+{
+    return a <= Float32(b);
+}
+
+constexpr inline bool operator<=(BFloat16 a, BFloat16 b)
+{
+    return Float32(a) <= Float32(b);
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator>=(const BFloat16 & a, const T & b)
+{
+    return Float32(a) >= b;
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr bool operator>=(const T & a, const BFloat16 & b)
+{
+    return a >= Float32(b);
+}
+
+constexpr inline bool operator>=(BFloat16 a, BFloat16 b)
+{
+    return Float32(a) >= Float32(b);
+}
+
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr inline auto operator+(T a, BFloat16 b)
+{
+    return a + Float32(b);
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr inline auto operator+(BFloat16 a, T b)
+{
+    return Float32(a) + b;
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr inline auto operator-(T a, BFloat16 b)
+{
+    return a - Float32(b);
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr inline auto operator-(BFloat16 a, T b)
+{
+    return Float32(a) - b;
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr inline auto operator*(T a, BFloat16 b)
+{
+    return a * Float32(b);
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr inline auto operator*(BFloat16 a, T b)
+{
+    return Float32(a) * b;
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr inline auto operator/(T a, BFloat16 b)
+{
+    return a / Float32(b);
+}
+
+template <typename T>
+requires(!std::is_same_v<T, BFloat16>)
+constexpr inline auto operator/(BFloat16 a, T b)
+{
+    return Float32(a) / b;
+}
+
 
 namespace std
 {
-    inline constexpr bool isfinite(BFloat16 x) { return (bit_cast<UInt16>(x) & 0b0111111110000000) != 0b0111111110000000; }
-    inline constexpr bool signbit(BFloat16 x) { return bit_cast<UInt16>(x) & 0b1000000000000000; }
-}
-
-inline Float32 BFloat16ToFloat32(BFloat16 x)
-{
-    return bit_cast<Float32>(static_cast<UInt32>(bit_cast<UInt16>(x)) << 16);
-}
-
-inline BFloat16 Float32ToBFloat16(Float32 x)
-{
-    return bit_cast<BFloat16>(std::bit_cast<UInt32>(x) >> 16);
+    inline constexpr bool isfinite(BFloat16 x) { return x.isFinite(); }
+    inline constexpr bool isnan(BFloat16 x) { return x.isNaN(); }
+    inline constexpr bool signbit(BFloat16 x) { return x.signBit(); }
 }

base/base/DecomposedFloat.h

@@ -11,7 +11,7 @@
 template <typename T> struct FloatTraits;
 
 template <>
-struct FloatTraits<__bf16>
+struct FloatTraits<BFloat16>
 {
     using UInt = uint16_t;
     static constexpr size_t bits = 16;

base/base/TypeLists.h

@@ -9,10 +9,11 @@ namespace DB
 {
 
 using TypeListNativeInt = TypeList<UInt8, UInt16, UInt32, UInt64, Int8, Int16, Int32, Int64>;
-using TypeListFloat = TypeList<BFloat16, Float32, Float64>;
-using TypeListNativeNumber = TypeListConcat<TypeListNativeInt, TypeListFloat>;
+using TypeListNativeFloat = TypeList<Float32, Float64>;
+using TypeListNativeNumber = TypeListConcat<TypeListNativeInt, TypeListNativeFloat>;
 using TypeListWideInt = TypeList<UInt128, Int128, UInt256, Int256>;
 using TypeListInt = TypeListConcat<TypeListNativeInt, TypeListWideInt>;
+using TypeListFloat = TypeListConcat<TypeListNativeFloat, TypeList<BFloat16>>;
 using TypeListIntAndFloat = TypeListConcat<TypeListInt, TypeListFloat>;
 using TypeListDecimal = TypeList<Decimal32, Decimal64, Decimal128, Decimal256>;
 using TypeListNumber = TypeListConcat<TypeListIntAndFloat, TypeListDecimal>;

src/AggregateFunctions/AggregateFunctionAvg.h

@@ -231,7 +231,7 @@ public:
 
     void add(AggregateDataPtr __restrict place, const IColumn ** columns, size_t row_num, Arena *) const final
     {
-        increment(place, static_cast<const ColVecType &>(*columns[0]).getData()[row_num]);
+        increment(place, Numerator(static_cast<const ColVecType &>(*columns[0]).getData()[row_num]));
         ++this->data(place).denominator;
     }
 

src/AggregateFunctions/AggregateFunctionDeltaSum.cpp

@@ -27,9 +27,9 @@ namespace
 template <typename T>
 struct AggregationFunctionDeltaSumData
 {
-    T sum = 0;
-    T last = 0;
-    T first = 0;
+    T sum{};
+    T last{};
+    T first{};
     bool seen = false;
 };
 

src/AggregateFunctions/AggregateFunctionDeltaSumTimestamp.cpp

@@ -25,11 +25,11 @@ namespace
 template <typename ValueType, typename TimestampType>
 struct AggregationFunctionDeltaSumTimestampData
 {
-    ValueType sum = 0;
-    ValueType first = 0;
-    ValueType last = 0;
-    TimestampType first_ts = 0;
-    TimestampType last_ts = 0;
+    ValueType sum{};
+    ValueType first{};
+    ValueType last{};
+    TimestampType first_ts{};
+    TimestampType last_ts{};
     bool seen = false;
 };
 

src/AggregateFunctions/AggregateFunctionMaxIntersections.cpp

@@ -155,9 +155,9 @@ public:
 
     void insertResultInto(AggregateDataPtr __restrict place, IColumn & to, Arena *) const override
     {
-        Int64 current_intersections = 0;
-        Int64 max_intersections = 0;
-        PointType position_of_max_intersections = 0;
+        Int64 current_intersections{};
+        Int64 max_intersections{};
+        PointType position_of_max_intersections{};
 
         /// const_cast because we will sort the array
         auto & array = this->data(place).value;

src/AggregateFunctions/AggregateFunctionSparkbar.cpp

@@ -45,7 +45,7 @@ struct AggregateFunctionSparkbarData
     Y insert(const X & x, const Y & y)
     {
         if (isNaN(y) || y <= 0)
-            return 0;
+            return {};
 
         auto [it, inserted] = points.insert({x, y});
         if (!inserted)
@@ -173,13 +173,13 @@ private:
 
         if (from_x >= to_x)
         {
-            size_t sz = updateFrame(values, 8);
+            size_t sz = updateFrame(values, Y{8});
             values.push_back('\0');
             offsets.push_back(offsets.empty() ? sz + 1 : offsets.back() + sz + 1);
             return;
         }
 
-        PaddedPODArray<Y> histogram(width, 0);
+        PaddedPODArray<Y> histogram(width, Y{0});
         PaddedPODArray<UInt64> count_histogram(width, 0); /// The number of points in each bucket
 
         for (const auto & point : data.points)
@@ -218,10 +218,10 @@ private:
         for (size_t i = 0; i < histogram.size(); ++i)
         {
             if (count_histogram[i] > 0)
-                histogram[i] /= count_histogram[i];
+                histogram[i] = histogram[i] / count_histogram[i];
         }
 
-        Y y_max = 0;
+        Y y_max{};
         for (auto & y : histogram)
         {
             if (isNaN(y) || y <= 0)
@@ -245,7 +245,7 @@ private:
                 continue;
             }
 
-            constexpr auto levels_num = static_cast<Y>(BAR_LEVELS - 1);
+            constexpr auto levels_num = Y{BAR_LEVELS - 1};
             if constexpr (is_floating_point<Y>)
             {
                 y = y / (y_max / levels_num) + 1;

src/AggregateFunctions/AggregateFunctionSum.h

@@ -83,7 +83,7 @@ struct AggregateFunctionSumData
             while (ptr < unrolled_end)
             {
                 for (size_t i = 0; i < unroll_count; ++i)
-                    Impl::add(partial_sums[i], ptr[i]);
+                    Impl::add(partial_sums[i], T(ptr[i]));
                 ptr += unroll_count;
             }
 
@@ -95,7 +95,7 @@ struct AggregateFunctionSumData
         T local_sum{};
         while (ptr < end_ptr)
         {
-            Impl::add(local_sum, *ptr);
+            Impl::add(local_sum, T(*ptr));
             ++ptr;
         }
         Impl::add(sum, local_sum);
@@ -227,7 +227,7 @@ struct AggregateFunctionSumData
         while (ptr < end_ptr)
         {
             if (!*condition_map == add_if_zero)
-                Impl::add(local_sum, *ptr);
+                Impl::add(local_sum, T(*ptr));
             ++ptr;
             ++condition_map;
         }
@@ -488,10 +488,7 @@ public:
     void add(AggregateDataPtr __restrict place, const IColumn ** columns, size_t row_num, Arena *) const override
     {
         const auto & column = assert_cast<const ColVecType &>(*columns[0]);
-        if constexpr (is_big_int_v<T>)
-            this->data(place).add(static_cast<TResult>(column.getData()[row_num]));
-        else
-            this->data(place).add(column.getData()[row_num]);
+        this->data(place).add(static_cast<TResult>(column.getData()[row_num]));
     }
 
     void addBatchSinglePlace(

src/Core/Types_fwd.h

@@ -21,7 +21,7 @@ using Int128 = wide::integer<128, signed>;
 using UInt128 = wide::integer<128, unsigned>;
 using Int256 = wide::integer<256, signed>;
 using UInt256 = wide::integer<256, unsigned>;
-using BFloat16 = __bf16;
+class BFloat16;
 
 namespace DB
 {

src/Functions/FunctionsRound.h

@@ -298,7 +298,7 @@ public:
 
     static VectorType prepare(size_t scale)
     {
-        return load1(scale);
+        return load1(ScalarType(scale));
     }
 };
 

src/Functions/PolygonUtils.h

@@ -583,7 +583,7 @@ struct CallPointInPolygon<Type, Types ...>
     template <typename PointInPolygonImpl>
     static ColumnPtr call(const IColumn & x, const IColumn & y, PointInPolygonImpl && impl)
     {
-        using Impl = TypeListChangeRoot<CallPointInPolygon, TypeListIntAndFloat>;
+        using Impl = TypeListChangeRoot<CallPointInPolygon, TypeListNativeNumber>;
         if (auto column = typeid_cast<const ColumnVector<Type> *>(&x))
             return Impl::template call<Type>(*column, y, impl);
         return CallPointInPolygon<Types ...>::call(x, y, impl);
@@ -609,7 +609,7 @@ struct CallPointInPolygon<>
 template <typename PointInPolygonImpl>
 NO_INLINE ColumnPtr pointInPolygon(const IColumn & x, const IColumn & y, PointInPolygonImpl && impl)
 {
-    using Impl = TypeListChangeRoot<CallPointInPolygon, TypeListIntAndFloat>;
+    using Impl = TypeListChangeRoot<CallPointInPolygon, TypeListNativeNumber>;
     return Impl::call(x, y, impl);
 }
 

src/Functions/divide.cpp

@@ -18,7 +18,7 @@ struct DivideFloatingImpl
     template <typename Result = ResultType>
     static NO_SANITIZE_UNDEFINED Result apply(A a [[maybe_unused]], B b [[maybe_unused]])
     {
-        return static_cast<Result>(a) / b;
+        return static_cast<Result>(a) / static_cast<Result>(b);
     }
 
 #if USE_EMBEDDED_COMPILER

src/IO/WriteHelpers.h

@@ -174,7 +174,7 @@ inline size_t writeFloatTextFastPath(T x, char * buffer)
     }
     else if constexpr (std::is_same_v<T, BFloat16>)
     {
-        Float32 f32 = BFloat16ToFloat32(x);
+        Float32 f32 = Float32(x);
 
         if (DecomposedFloat32(f32).isIntegerInRepresentableRange())
             result = itoa(Int32(f32), buffer) - buffer;