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48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionBinaryArithmetic.h>
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#include <common/arithmeticOverflow.h>
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namespace DB
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{
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template <typename A, typename B>
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struct PlusImpl
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{
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using ResultType = typename NumberTraits::ResultOfAdditionMultiplication<A, B>::Type;
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static const constexpr bool allow_decimal = true;
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static const constexpr bool allow_fixed_string = false;
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template <typename Result = ResultType>
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static inline NO_SANITIZE_UNDEFINED Result apply(A a, B b)
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{
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/// Next everywhere, static_cast - so that there is no wrong result in expressions of the form Int64 c = UInt32(a) * Int32(-1).
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return static_cast<Result>(a) + b;
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}
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/// Apply operation and check overflow. It's used for Deciamal operations. @returns true if overflowed, false otherwise.
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template <typename Result = ResultType>
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static inline bool apply(A a, B b, Result & c)
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{
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return common::addOverflow(static_cast<Result>(a), b, c);
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}
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#if USE_EMBEDDED_COMPILER
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static constexpr bool compilable = true;
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static inline llvm::Value * compile(llvm::IRBuilder<> & b, llvm::Value * left, llvm::Value * right, bool)
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{
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return left->getType()->isIntegerTy() ? b.CreateAdd(left, right) : b.CreateFAdd(left, right);
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}
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#endif
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};
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struct NamePlus { static constexpr auto name = "plus"; };
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using FunctionPlus = FunctionBinaryArithmetic<PlusImpl, NamePlus>;
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void registerFunctionPlus(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionPlus>();
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}
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}
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