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fix math functions

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This commit is contained in:
bolero-MURAKAMI 2013-05-05 00:06:30 +09:00
parent ffb876c930
commit fccb16687b
20 changed files with 209 additions and 68 deletions
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12
sprout/math/logb2.hpp
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@ -13,6 +13,7 @@
# include <limits>
# include <sprout/detail/pow.hpp>
# include <sprout/math/detail/float_compute.hpp>
# include <sprout/math/isnan.hpp>
# include <sprout/math/log_a.hpp>
# include <sprout/math/trunc.hpp>
# include <sprout/math/itrunc.hpp>
@ -61,7 +62,7 @@ namespace sprout {
inline SPROUT_CONSTEXPR T
logb2_impl_3_pos_lo(T x, T x0, T base, T exp) {
return base < 1 ? sprout::math::detail::logb2_impl_3_pos_lo(
x, x0 * 2, x / (x0 / 2), exp + 1
x, x0 * 2, x / (x0 / 2), exp - 1
)
: exp
;
@ -70,7 +71,7 @@ namespace sprout {
inline SPROUT_CONSTEXPR T
logb2_impl_3_pos_hi(T x, T x0, T base, T exp) {
return !(base < 2) ? sprout::math::detail::logb2_impl_3_pos_hi(
x, x0 / 2, x / (x0 * 2), exp - 1
x, x0 / 2, x / (x0 * 2), exp + 1
)
: exp
;
@ -87,10 +88,10 @@ namespace sprout {
)
: exp
: base < 1 ? sprout::math::detail::logb2_impl_3_pos_lo(
x, x0 * 2, x / (x0 / 2), exp + 1
x, x0 * 2, x / (x0 / 2), exp - 1
)
: !(base < 2) ? sprout::math::detail::logb2_impl_3_pos_hi(
x, x0 / 2, x / (x0 * 2), exp - 1
x, x0 / 2, x / (x0 * 2), exp + 1
)
: exp
;
@ -121,7 +122,8 @@ namespace sprout {
>
inline SPROUT_CONSTEXPR FloatType
logb2(FloatType x) {
return x == 0 ? -std::numeric_limits<FloatType>::infinity()
return sprout::math::isnan(x) ? x
: x == 0 ? -std::numeric_limits<FloatType>::infinity()
: x == std::numeric_limits<FloatType>::infinity() || x == -std::numeric_limits<FloatType>::infinity()
? std::numeric_limits<FloatType>::infinity()
: static_cast<FloatType>(sprout::math::detail::logb2_impl(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x)))