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Editing: xsimd_avx512bw.hpp

/***************************************************************************
 * Copyright (c) Johan Mabille, Sylvain Corlay, Wolf Vollprecht and         *
 * Martin Renou                                                             *
 * Copyright (c) QuantStack                                                 *
 * Copyright (c) Serge Guelton                                              *
 *                                                                          *
 * Distributed under the terms of the BSD 3-Clause License.                 *
 *                                                                          *
 * The full license is in the file LICENSE, distributed with this software. *
 ****************************************************************************/

#ifndef XSIMD_AVX512BW_HPP
#define XSIMD_AVX512BW_HPP

#include <type_traits>

#include "../types/xsimd_avx512bw_register.hpp"

namespace xsimd
{

namespace kernel
    {
        using namespace types;

namespace detail
        {
            template <class A, class T, int Cmp>
            inline batch_bool<T, A> compare_int_avx512bw(batch<T, A> const& self, batch<T, A> const& other) noexcept
            {
                using register_type = typename batch_bool<T, A>::register_type;
                if (std::is_signed<T>::value)
                {
                    switch (sizeof(T))
                    {
                    case 1:
                        return (register_type)_mm512_cmp_epi8_mask(self, other, Cmp);
                    case 2:
                        return (register_type)_mm512_cmp_epi16_mask(self, other, Cmp);
                    case 4:
                        return (register_type)_mm512_cmp_epi32_mask(self, other, Cmp);
                    case 8:
                        return (register_type)_mm512_cmp_epi64_mask(self, other, Cmp);
                    }
                }
                else
                {
                    switch (sizeof(T))
                    {
                    case 1:
                        return (register_type)_mm512_cmp_epu8_mask(self, other, Cmp);
                    case 2:
                        return (register_type)_mm512_cmp_epu16_mask(self, other, Cmp);
                    case 4:
                        return (register_type)_mm512_cmp_epu32_mask(self, other, Cmp);
                    case 8:
                        return (register_type)_mm512_cmp_epu64_mask(self, other, Cmp);
                    }
                }
            }
        }

// abs
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> abs(batch<T, A> const& self, requires_arch<avx512bw>) noexcept
        {
            if (std::is_unsigned<T>::value)
                return self;

switch (sizeof(T))
            {
            case 1:
                return _mm512_abs_epi8(self);
            case 2:
                return _mm512_abs_epi16(self);
            default:
                return abs(self, avx512dq {});
            }
        }

// add
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> add(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            switch (sizeof(T))
            {
            case 1:
                return _mm512_add_epi8(self, other);
            case 2:
                return _mm512_add_epi16(self, other);
            default:
                return add(self, other, avx512dq {});
            }
        }

// bitwise_lshift
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> bitwise_lshift(batch<T, A> const& self, int32_t other, requires_arch<avx512bw>) noexcept
        {
            switch (sizeof(T))
            {
#if defined(XSIMD_AVX512_SHIFT_INTRINSICS_IMM_ONLY)
            case 2:
                return _mm512_sllv_epi16(self, _mm512_set1_epi16(other));
#else
            case 2:
                return _mm512_slli_epi16(self, other);
#endif
            default:
                return bitwise_lshift(self, other, avx512dq {});
            }
        }

// bitwise_rshift
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> bitwise_rshift(batch<T, A> const& self, int32_t other, requires_arch<avx512bw>) noexcept
        {
            if (std::is_signed<T>::value)
            {
                switch (sizeof(T))
                {
                case 1:
                {
                    __m512i sign_mask = _mm512_set1_epi16((0xFF00 >> other) & 0x00FF);
                    __m512i zeros = _mm512_setzero_si512();
                    __mmask64 cmp_is_negative_mask = _mm512_cmpgt_epi8_mask(zeros, self);
                    __m512i cmp_sign_mask = _mm512_mask_blend_epi8(cmp_is_negative_mask, zeros, sign_mask);
#if defined(XSIMD_AVX512_SHIFT_INTRINSICS_IMM_ONLY)
                    __m512i res = _mm512_srav_epi16(self, _mm512_set1_epi16(other));
#else
                    __m512i res = _mm512_srai_epi16(self, other);
#endif
                    return _mm512_or_si512(cmp_sign_mask, _mm512_andnot_si512(sign_mask, res));
                }
#if defined(XSIMD_AVX512_SHIFT_INTRINSICS_IMM_ONLY)
                case 2:
                    return _mm512_srav_epi16(self, _mm512_set1_epi16(other));
#else
                case 2:
                    return _mm512_srai_epi16(self, other);
#endif
                default:
                    return bitwise_rshift(self, other, avx512dq {});
                }
            }
            else
            {
                switch (sizeof(T))
                {
#if defined(XSIMD_AVX512_SHIFT_INTRINSICS_IMM_ONLY)
                case 2:
                    return _mm512_srlv_epi16(self, _mm512_set1_epi16(other));
#else
                case 2:
                    return _mm512_srli_epi16(self, other);
#endif
                default:
                    return bitwise_rshift(self, other, avx512dq {});
                }
            }
        }

// eq
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch_bool<T, A> eq(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            return detail::compare_int_avx512bw<A, T, _MM_CMPINT_EQ>(self, other);
        }

// ge
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch_bool<T, A> ge(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            return detail::compare_int_avx512bw<A, T, _MM_CMPINT_GE>(self, other);
        }

// gt
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch_bool<T, A> gt(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            return detail::compare_int_avx512bw<A, T, _MM_CMPINT_GT>(self, other);
        }

// le
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch_bool<T, A> le(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            return detail::compare_int_avx512bw<A, T, _MM_CMPINT_LE>(self, other);
        }

// lt
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch_bool<T, A> lt(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            return detail::compare_int_avx512bw<A, T, _MM_CMPINT_LT>(self, other);
        }

// max
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> max(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            if (std::is_signed<T>::value)
            {
                switch (sizeof(T))
                {
                case 1:
                    return _mm512_max_epi8(self, other);
                case 2:
                    return _mm512_max_epi16(self, other);
                default:
                    return max(self, other, avx512dq {});
                }
            }
            else
            {
                switch (sizeof(T))
                {
                case 1:
                    return _mm512_max_epu8(self, other);
                case 2:
                    return _mm512_max_epu16(self, other);
                default:
                    return max(self, other, avx512dq {});
                }
            }
        }

// min
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> min(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            if (std::is_signed<T>::value)
            {
                switch (sizeof(T))
                {
                case 1:
                    return _mm512_min_epi8(self, other);
                case 2:
                    return _mm512_min_epi16(self, other);
                default:
                    return min(self, other, avx512dq {});
                }
            }
            else
            {
                switch (sizeof(T))
                {
                case 1:
                    return _mm512_min_epu8(self, other);
                case 2:
                    return _mm512_min_epu16(self, other);
                default:
                    return min(self, other, avx512dq {});
                }
            }
        }

// mul
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> mul(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            switch (sizeof(T))
            {
            case 1:
            {
                __m512i upper = _mm512_and_si512(_mm512_mullo_epi16(self, other), _mm512_srli_epi16(_mm512_set1_epi16(-1), 8));
                __m512i lower = _mm512_slli_epi16(_mm512_mullo_epi16(_mm512_srli_epi16(self, 8), _mm512_srli_epi16(other, 8)), 8);
                return _mm512_or_si512(upper, lower);
            }
            case 2:
                return _mm512_mullo_epi16(self, other);
            default:
                return mul(self, other, avx512dq {});
            }
        }

// neq
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch_bool<T, A> neq(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            return detail::compare_int_avx512bw<A, T, _MM_CMPINT_NE>(self, other);
        }

// sadd
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> sadd(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            if (std::is_signed<T>::value)
            {
                switch (sizeof(T))
                {
                case 1:
                    return _mm512_adds_epi8(self, other);
                case 2:
                    return _mm512_adds_epi16(self, other);
                default:
                    return sadd(self, other, avx512dq {});
                }
            }
            else
            {
                switch (sizeof(T))
                {
                case 1:
                    return _mm512_adds_epu8(self, other);
                case 2:
                    return _mm512_adds_epu16(self, other);
                default:
                    return sadd(self, other, avx512dq {});
                }
            }
        }

// select
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> select(batch_bool<T, A> const& cond, batch<T, A> const& true_br, batch<T, A> const& false_br, requires_arch<avx512bw>) noexcept
        {
            switch (sizeof(T))
            {
            case 1:
                return _mm512_mask_blend_epi8(cond, false_br, true_br);
            case 2:
                return _mm512_mask_blend_epi16(cond, false_br, true_br);
            default:
                return select(cond, true_br, false_br, avx512dq {});
            };
        }

// ssub
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> ssub(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            if (std::is_signed<T>::value)
            {
                switch (sizeof(T))
                {
                case 1:
                    return _mm512_subs_epi8(self, other);
                case 2:
                    return _mm512_subs_epi16(self, other);
                default:
                    return ssub(self, other, avx512dq {});
                }
            }
            else
            {
                switch (sizeof(T))
                {
                case 1:
                    return _mm512_subs_epu8(self, other);
                case 2:
                    return _mm512_subs_epu16(self, other);
                default:
                    return ssub(self, other, avx512dq {});
                }
            }
        }

// sub
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> sub(batch<T, A> const& self, batch<T, A> const& other, requires_arch<avx512bw>) noexcept
        {
            switch (sizeof(T))
            {
            case 1:
                return _mm512_sub_epi8(self, other);
            case 2:
                return _mm512_sub_epi16(self, other);
            default:
                return sub(self, other, avx512dq {});
            }
        }

// swizzle

template <class A, uint16_t... Vs>
        inline batch<uint16_t, A> swizzle(batch<uint16_t, A> const& self, batch_constant<batch<uint16_t, A>, Vs...> mask, requires_arch<avx512bw>) noexcept
        {
            return _mm512_permutexvar_epi16((batch<uint16_t, A>)mask, self);
        }

template <class A, uint16_t... Vs>
        inline batch<int16_t, A> swizzle(batch<int16_t, A> const& self, batch_constant<batch<uint16_t, A>, Vs...> mask, requires_arch<avx512bw>) noexcept
        {
            return bitwise_cast<batch<int16_t, A>>(swizzle(bitwise_cast<batch<uint16_t, A>>(self), mask, avx512bw {}));
        }

template <class A, uint8_t... Vs>
        inline batch<uint8_t, A> swizzle(batch<uint8_t, A> const& self, batch_constant<batch<uint8_t, A>, Vs...> mask, requires_arch<avx512bw>) noexcept
        {
            return _mm512_permutexvar_epi8((batch<uint8_t, A>)mask, self);
        }

template <class A, uint8_t... Vs>
        inline batch<int8_t, A> swizzle(batch<int8_t, A> const& self, batch_constant<batch<uint8_t, A>, Vs...> mask, requires_arch<avx512bw>) noexcept
        {
            return bitwise_cast<batch<int8_t, A>>(swizzle(bitwise_cast<batch<uint8_t, A>>(self), mask, avx512bw {}));
        }
    }

}

#endif

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