algorithms.h

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

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the names of contributing organizations nor the
      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
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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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));
}

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_n(InputIt first, std::size_t count, UnaryFunction f)
{
    typename std::make_signed<size_t>::type len = count;
    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) &&
           len != 0;
         --len, ++first) {
        f(V1(std::addressof(*first), Vc::Aligned));
    }
    for (; len >= int(V::Size); len -= V::Size, first += V::Size) {
        f(V(std::addressof(*first), Vc::Aligned));
    }
    for (; len != 0; --len, ++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_n(InputIt first, std::size_t count, UnaryFunction f)
{
    typename std::make_signed<size_t>::type len = count;
    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) &&
           len != 0;
         --len, ++first) {
        V1 tmp(std::addressof(*first), Vc::Aligned);
        f(tmp);
        tmp.store(std::addressof(*first), Vc::Aligned);
    }
    for (; len >= int(V::Size); len -= V::Size, first += V::Size) {
        V tmp(std::addressof(*first), Vc::Aligned);
        f(tmp);
        tmp.store(std::addressof(*first), Vc::Aligned);
    }
    for (; len != 0; --len, ++first) {
        V1 tmp(std::addressof(*first), Vc::Aligned);
        f(tmp);
        tmp.store(std::addressof(*first), Vc::Aligned);
    }
    return std::move(f);
}

#ifdef Vc_CXX17
template <typename InputIt, typename UnaryFunction>
inline enable_if<!std::is_arithmetic<typename InputIt::value_type>::value, UnaryFunction>
simd_for_each_n(InputIt first, std::size_t count, UnaryFunction f)
{
    return std::for_each_n(first, count, std::move(f));
}
#endif

}  // namespace Vc

#endif // VC_COMMON_ALGORITHMS_H_