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66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionBinaryArithmetic.h>
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#include <Core/AccurateComparison.h>
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#include <Functions/LeastGreatestGeneric.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 GreatestBaseImpl
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{
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using ResultType = NumberTraits::ResultOfGreatest<A, B>;
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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 Result apply(A a, B b)
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{
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return static_cast<Result>(a) > static_cast<Result>(b) ? static_cast<Result>(a) : static_cast<Result>(b);
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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 is_signed)
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{
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if (!left->getType()->isIntegerTy())
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/// XXX maxnum is basically fmax(), it may or may not match whatever apply() does
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/// XXX CreateMaxNum is broken on LLVM 5.0 and 6.0 (generates minnum instead; fixed in 7)
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return b.CreateBinaryIntrinsic(llvm::Intrinsic::maxnum, left, right);
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return b.CreateSelect(is_signed ? b.CreateICmpSGT(left, right) : b.CreateICmpUGT(left, right), left, right);
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}
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#endif
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};
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template <typename A, typename B>
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struct GreatestSpecialImpl
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{
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using ResultType = std::make_unsigned_t<A>;
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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 Result apply(A a, B b)
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{
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static_assert(std::is_same_v<Result, ResultType>, "ResultType != Result");
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return accurate::greaterOp(a, b) ? static_cast<Result>(a) : static_cast<Result>(b);
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}
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#if USE_EMBEDDED_COMPILER
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static constexpr bool compilable = false; /// ???
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#endif
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};
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template <typename A, typename B>
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using GreatestImpl = std::conditional_t<!NumberTraits::LeastGreatestSpecialCase<A, B>, GreatestBaseImpl<A, B>, GreatestSpecialImpl<A, B>>;
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struct NameGreatest { static constexpr auto name = "greatest"; };
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using FunctionGreatest = FunctionBinaryArithmetic<GreatestImpl, NameGreatest>;
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void registerFunctionGreatest(FunctionFactory & factory)
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{
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factory.registerFunction<LeastGreatestOverloadResolver<LeastGreatest::Greatest, FunctionGreatest>>(FunctionFactory::CaseInsensitive);
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}
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}
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