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https://github.com/bolero-MURAKAMI/Sprout.git
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56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
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#ifndef SPROUT_MATH_FMA_HPP
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#define SPROUT_MATH_FMA_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/math/float_promote.hpp>
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#include <sprout/utility/enabler_if.hpp>
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#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
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# include <cmath>
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#endif
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namespace sprout {
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namespace math {
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namespace detail {
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template<
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typename FloatType,
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typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR FloatType
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fma(FloatType x, FloatType y, FloatType z) {
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return x * y + z;
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}
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template<
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typename ArithmeticType1,
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typename ArithmeticType2,
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typename ArithmeticType3,
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typename sprout::enabler_if<
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std::is_arithmetic<ArithmeticType1>::value
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&& std::is_arithmetic<ArithmeticType2>::value
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&& std::is_arithmetic<ArithmeticType3>::value
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>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR typename sprout::math::float_promote<
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ArithmeticType1, ArithmeticType2, ArithmeticType3
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>::type
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fma(ArithmeticType1 x, ArithmeticType2 y, ArithmeticType3 z) {
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typedef typename sprout::math::float_promote<
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ArithmeticType1, ArithmeticType2, ArithmeticType3
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>::type type;
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return sprout::math::detail::fma(static_cast<type>(x), static_cast<type>(y), static_cast<type>(z));
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}
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} // namespace detail
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# if SPROUT_USE_BUILTIN_CMATH_FUNCTION
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using std::fma;
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# else
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using sprout::math::detail::fma;
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# endif
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} // namespace math
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using sprout::math::fma;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_FMA_HPP
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