diff options
Diffstat (limited to 'third_party/xsimd/include/xsimd/arch/generic/xsimd_generic_math.hpp')
| -rw-r--r-- | third_party/xsimd/include/xsimd/arch/generic/xsimd_generic_math.hpp | 59 |
1 files changed, 58 insertions, 1 deletions
diff --git a/third_party/xsimd/include/xsimd/arch/generic/xsimd_generic_math.hpp b/third_party/xsimd/include/xsimd/arch/generic/xsimd_generic_math.hpp index 8fa887dc57..7bcc4da241 100644 --- a/third_party/xsimd/include/xsimd/arch/generic/xsimd_generic_math.hpp +++ b/third_party/xsimd/include/xsimd/arch/generic/xsimd_generic_math.hpp @@ -26,7 +26,7 @@ namespace xsimd using namespace types; // abs - template <class A, class T, class /*=typename std::enable_if<std::is_integral<T>::value, void>::type*/> + template <class A, class T, class> inline batch<T, A> abs(batch<T, A> const& self, requires_arch<generic>) noexcept { if (std::is_unsigned<T>::value) @@ -45,6 +45,63 @@ namespace xsimd return hypot(z.real(), z.imag()); } + // avg + namespace detail + { + template <class A, class T> + inline batch<T, A> avg(batch<T, A> const& x, batch<T, A> const& y, std::true_type, std::false_type) noexcept + { + return (x & y) + ((x ^ y) >> 1); + } + + template <class A, class T> + inline batch<T, A> avg(batch<T, A> const& x, batch<T, A> const& y, std::true_type, std::true_type) noexcept + { + // Inspired by + // https://stackoverflow.com/questions/5697500/take-the-average-of-two-signed-numbers-in-c + auto t = (x & y) + ((x ^ y) >> 1); + auto t_u = bitwise_cast<typename std::make_unsigned<T>::type>(t); + auto avg = t + (bitwise_cast<T>(t_u >> (8 * sizeof(T) - 1)) & (x ^ y)); + return avg; + } + + template <class A, class T> + inline batch<T, A> avg(batch<T, A> const& x, batch<T, A> const& y, std::false_type, std::true_type) noexcept + { + return (x + y) / 2; + } + } + + template <class A, class T> + inline batch<T, A> avg(batch<T, A> const& x, batch<T, A> const& y, requires_arch<generic>) noexcept + { + return detail::avg(x, y, typename std::is_integral<T>::type {}, typename std::is_signed<T>::type {}); + } + + // avgr + namespace detail + { + template <class A, class T> + inline batch<T, A> avgr(batch<T, A> const& x, batch<T, A> const& y, std::true_type) noexcept + { + constexpr unsigned shift = 8 * sizeof(T) - 1; + auto adj = std::is_signed<T>::value ? ((x ^ y) & 0x1) : (((x ^ y) << shift) >> shift); + return ::xsimd::kernel::avg(x, y, A {}) + adj; + } + + template <class A, class T> + inline batch<T, A> avgr(batch<T, A> const& x, batch<T, A> const& y, std::false_type) noexcept + { + return ::xsimd::kernel::avg(x, y, A {}); + } + } + + template <class A, class T> + inline batch<T, A> avgr(batch<T, A> const& x, batch<T, A> const& y, requires_arch<generic>) noexcept + { + return detail::avgr(x, y, typename std::is_integral<T>::type {}); + } + // batch_cast template <class A, class T> inline batch<T, A> batch_cast(batch<T, A> const& self, batch<T, A> const&, requires_arch<generic>) noexcept |