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45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#include <Functions/FunctionNumericPredicate.h>
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#include <Functions/FunctionFactory.h>
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#include <ext/bit_cast.h>
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#include <type_traits>
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namespace DB
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{
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struct IsFiniteImpl
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{
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/// Better implementation, because isinf, isfinite, isnan are not inlined for unknown reason.
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/// Assuming IEEE 754.
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/// NOTE gcc 7 doesn't vectorize this loop.
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static constexpr auto name = "isFinite";
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template <typename T>
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static bool execute(const T t)
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{
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if constexpr (std::is_same_v<T, float>)
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return (ext::bit_cast<uint32_t>(t)
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& 0b01111111100000000000000000000000)
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!= 0b01111111100000000000000000000000;
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else if constexpr (std::is_same_v<T, double>)
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return (ext::bit_cast<uint64_t>(t)
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& 0b0111111111110000000000000000000000000000000000000000000000000000)
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!= 0b0111111111110000000000000000000000000000000000000000000000000000;
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else
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{
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(void)t;
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return true;
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}
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}
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};
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using FunctionIsFinite = FunctionNumericPredicate<IsFiniteImpl>;
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void registerFunctionIsFinite(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionIsFinite>();
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}
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}
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