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fix math functions

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This commit is contained in:
bolero-MURAKAMI 2013-05-06 00:22:08 +09:00
parent fccb16687b
commit 7794e56192
27 changed files with 342 additions and 102 deletions
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20
sprout/math/erf.hpp
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@ -4,11 +4,12 @@
#include <limits>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/detail/pow.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/math/detail/float_compute.hpp>
#include <sprout/math/isnan.hpp>
#include <sprout/math/itrunc.hpp>
#include <sprout/math/fractional_part.hpp>
#include <sprout/detail/pow.hpp>
#include <sprout/type_traits/enabler_if.hpp>
namespace sprout {
@ -102,13 +103,13 @@ namespace sprout {
template<typename T>
inline SPROUT_CONSTEXPR T
erf_impl_2_a(T x, T w, T t) {
return sprout::math::detail::erf_impl_2_a_1(x, w, sprout::fractional_part(t), sprout::math::itrunc(t));
return sprout::math::detail::erf_impl_2_a_1(x, w, sprout::math::fractional_part(t), sprout::math::itrunc(t));
}
template<typename T>
inline SPROUT_CONSTEXPR T
erf_impl_1(T x, T w) {
return w < T(2.2) ? sprout::math::detail::erf_impl_2_a(x, w, w * w)
: w < T(6.9) ? sprout::math::detail::erf_impl_2_b(x, w, sprout::fractional_part(w), sprout::math::itrunc(w) - 2)
: w < T(6.9) ? sprout::math::detail::erf_impl_2_b(x, w, sprout::math::fractional_part(w), sprout::math::itrunc(w) - 2)
: sprout::math::detail::erf_impl_3(x, T(1))
;
}
@ -124,14 +125,17 @@ namespace sprout {
>
inline SPROUT_CONSTEXPR FloatType
erf(FloatType x) {
typedef typename sprout::math::detail::float_compute<FloatType>::type type;
return x == 0 ? FloatType(0)
return sprout::math::isnan(x) ? x
: x == std::numeric_limits<FloatType>::infinity() ? FloatType(1)
: x == -std::numeric_limits<FloatType>::infinity() ? FloatType(-1)
: static_cast<FloatType>(sprout::math::detail::erf_impl(static_cast<type>(x)))
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: std::erf(x)
#else
: x == 0 ? x
: static_cast<FloatType>(sprout::math::detail::erf_impl(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x)))
#endif
;
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
@ -142,7 +146,7 @@ namespace sprout {
}
} // namespace detail
using NS_SPROUT_MATH_DETAIL::erf;
using sprout::math::detail::erf;
} // namespace math
using sprout::math::erf;