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105 lines
4.4 KiB
C++
105 lines
4.4 KiB
C++
#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionBinaryArithmetic.h>
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#ifdef __SSE2__
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#define LIBDIVIDE_USE_SSE2 1
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#endif
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#include <libdivide.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int ILLEGAL_DIVISION;
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}
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/// Optimizations for integer division by a constant.
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template <typename A, typename B>
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struct DivideIntegralByConstantImpl
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: BinaryOperationImplBase<A, B, DivideIntegralImpl<A, B>>
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{
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using ResultType = typename DivideIntegralImpl<A, B>::ResultType;
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static const constexpr bool allow_fixed_string = false;
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static NO_INLINE void vectorConstant(const A * __restrict a_pos, B b, ResultType * __restrict c_pos, size_t size)
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{
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if (unlikely(b == 0))
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throw Exception("Division by zero", ErrorCodes::ILLEGAL_DIVISION);
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wsign-compare"
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if (unlikely(is_signed_v<B> && b == -1))
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{
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for (size_t i = 0; i < size; ++i)
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c_pos[i] = -a_pos[i];
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return;
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}
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#pragma GCC diagnostic pop
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libdivide::divider<A> divider(b);
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const A * a_end = a_pos + size;
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#ifdef __SSE2__
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static constexpr size_t values_per_sse_register = 16 / sizeof(A);
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const A * a_end_sse = a_pos + size / values_per_sse_register * values_per_sse_register;
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while (a_pos < a_end_sse)
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{
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_mm_storeu_si128(reinterpret_cast<__m128i *>(c_pos),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(a_pos)) / divider);
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a_pos += values_per_sse_register;
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c_pos += values_per_sse_register;
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}
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#endif
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while (a_pos < a_end)
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{
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*c_pos = *a_pos / divider;
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++a_pos;
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++c_pos;
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}
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}
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};
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/** Specializations are specified for dividing numbers of the type UInt64 and UInt32 by the numbers of the same sign.
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* Can be expanded to all possible combinations, but more code is needed.
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*/
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template <> struct BinaryOperationImpl<UInt64, UInt8, DivideIntegralImpl<UInt64, UInt8>> : DivideIntegralByConstantImpl<UInt64, UInt8> {};
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template <> struct BinaryOperationImpl<UInt64, UInt16, DivideIntegralImpl<UInt64, UInt16>> : DivideIntegralByConstantImpl<UInt64, UInt16> {};
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template <> struct BinaryOperationImpl<UInt64, UInt32, DivideIntegralImpl<UInt64, UInt32>> : DivideIntegralByConstantImpl<UInt64, UInt32> {};
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template <> struct BinaryOperationImpl<UInt64, UInt64, DivideIntegralImpl<UInt64, UInt64>> : DivideIntegralByConstantImpl<UInt64, UInt64> {};
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template <> struct BinaryOperationImpl<UInt32, UInt8, DivideIntegralImpl<UInt32, UInt8>> : DivideIntegralByConstantImpl<UInt32, UInt8> {};
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template <> struct BinaryOperationImpl<UInt32, UInt16, DivideIntegralImpl<UInt32, UInt16>> : DivideIntegralByConstantImpl<UInt32, UInt16> {};
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template <> struct BinaryOperationImpl<UInt32, UInt32, DivideIntegralImpl<UInt32, UInt32>> : DivideIntegralByConstantImpl<UInt32, UInt32> {};
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template <> struct BinaryOperationImpl<UInt32, UInt64, DivideIntegralImpl<UInt32, UInt64>> : DivideIntegralByConstantImpl<UInt32, UInt64> {};
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template <> struct BinaryOperationImpl<Int64, Int8, DivideIntegralImpl<Int64, Int8>> : DivideIntegralByConstantImpl<Int64, Int8> {};
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template <> struct BinaryOperationImpl<Int64, Int16, DivideIntegralImpl<Int64, Int16>> : DivideIntegralByConstantImpl<Int64, Int16> {};
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template <> struct BinaryOperationImpl<Int64, Int32, DivideIntegralImpl<Int64, Int32>> : DivideIntegralByConstantImpl<Int64, Int32> {};
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template <> struct BinaryOperationImpl<Int64, Int64, DivideIntegralImpl<Int64, Int64>> : DivideIntegralByConstantImpl<Int64, Int64> {};
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template <> struct BinaryOperationImpl<Int32, Int8, DivideIntegralImpl<Int32, Int8>> : DivideIntegralByConstantImpl<Int32, Int8> {};
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template <> struct BinaryOperationImpl<Int32, Int16, DivideIntegralImpl<Int32, Int16>> : DivideIntegralByConstantImpl<Int32, Int16> {};
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template <> struct BinaryOperationImpl<Int32, Int32, DivideIntegralImpl<Int32, Int32>> : DivideIntegralByConstantImpl<Int32, Int32> {};
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template <> struct BinaryOperationImpl<Int32, Int64, DivideIntegralImpl<Int32, Int64>> : DivideIntegralByConstantImpl<Int32, Int64> {};
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struct NameIntDiv { static constexpr auto name = "intDiv"; };
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using FunctionIntDiv = FunctionBinaryArithmetic<DivideIntegralImpl, NameIntDiv, false>;
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void registerFunctionIntDiv(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionIntDiv>();
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}
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}
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