algorithms.h

/*  This file is part of the Vc library. {{{
Copyright © 2013-2015 Matthias Kretz <kretz@kde.org>
All rights reserved.

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      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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}}}*/

#ifndef VC_COMMON_ALGORITHMS_H_
#define VC_COMMON_ALGORITHMS_H_

#include "macros.h"

namespace Vc_VERSIONED_NAMESPACE
{

template<typename Mask> constexpr bool all_of(const Mask &m) { return m.isFull(); }
constexpr bool all_of(bool b) { return b; }

template<typename Mask> constexpr bool any_of(const Mask &m) { return m.isNotEmpty(); }
constexpr bool any_of(bool b) { return b; }

template<typename Mask> constexpr bool none_of(const Mask &m) { return m.isEmpty(); }
constexpr bool none_of(bool b) { return !b; }

template<typename Mask> constexpr bool some_of(const Mask &m) { return m.isMix(); }
constexpr bool some_of(bool) { return false; }

template <typename InputIt, typename UnaryFunction>
inline enable_if<std::is_arithmetic<typename InputIt::value_type>::value &&
                     Traits::is_functor_argument_immutable<
                         UnaryFunction, Vector<typename InputIt::value_type>>::value,
                 UnaryFunction>
simd_for_each(InputIt first, InputIt last, UnaryFunction f)
{
    typedef Vector<typename InputIt::value_type> V;
    typedef Scalar::Vector<typename InputIt::value_type> V1;
    for (; reinterpret_cast<std::uintptr_t>(std::addressof(*first)) &
                   (V::MemoryAlignment - 1) &&
               first != last;
         ++first) {
        f(V1(std::addressof(*first), Vc::Aligned));
    }
    const auto lastV = last - (V::Size + 1);
    for (; first < lastV; first += V::Size) {
        f(V(std::addressof(*first), Vc::Aligned));
    }
    for (; first != last; ++first) {
        f(V1(std::addressof(*first), Vc::Aligned));
    }
    return std::move(f);
}

template <typename InputIt, typename UnaryFunction>
inline enable_if<std::is_arithmetic<typename InputIt::value_type>::value &&
                     !Traits::is_functor_argument_immutable<
                         UnaryFunction, Vector<typename InputIt::value_type>>::value,
                 UnaryFunction>
simd_for_each(InputIt first, InputIt last, UnaryFunction f)
{
    typedef Vector<typename InputIt::value_type> V;
    typedef Scalar::Vector<typename InputIt::value_type> V1;
    for (; reinterpret_cast<std::uintptr_t>(std::addressof(*first)) &
                   (V::MemoryAlignment - 1) &&
               first != last;
         ++first) {
        V1 tmp(std::addressof(*first), Vc::Aligned);
        f(tmp);
        tmp.store(std::addressof(*first), Vc::Aligned);
    }
    const auto lastV = last - (V::Size + 1);
    for (; first < lastV; first += V::Size) {
        V tmp(std::addressof(*first), Vc::Aligned);
        f(tmp);
        tmp.store(std::addressof(*first), Vc::Aligned);
    }
    for (; first != last; ++first) {
        V1 tmp(std::addressof(*first), Vc::Aligned);
        f(tmp);
        tmp.store(std::addressof(*first), Vc::Aligned);
    }
    return std::move(f);
}

template <typename InputIt, typename UnaryFunction>
inline enable_if<!std::is_arithmetic<typename InputIt::value_type>::value, UnaryFunction>
simd_for_each(InputIt first, InputIt last, UnaryFunction f)
{
    return std::for_each(first, last, std::move(f));
}

}  // namespace Vc

#endif // VC_COMMON_ALGORITHMS_H_