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/*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*
* Copyright (c) 2020 Andrey Semashev
*/
/*!
* \file find_address_sse41.cpp
*
* This file contains SSE4.1 implementation of the \c find_address algorithm
*/
#include <boost/predef/architecture/x86.h>
#include <boost/atomic/detail/int_sizes.hpp>
#if BOOST_ARCH_X86 && defined(BOOST_ATOMIC_DETAIL_SIZEOF_POINTER) && (BOOST_ATOMIC_DETAIL_SIZEOF_POINTER == 8)
#include <cstddef>
#include <smmintrin.h>
#include <boost/cstdint.hpp>
#include <boost/atomic/detail/config.hpp>
#include <boost/atomic/detail/intptr.hpp>
#include "find_address.hpp"
#include "x86_vector_tools.hpp"
#include "bit_operation_tools.hpp"
#include <boost/atomic/detail/header.hpp>
namespace boost {
namespace atomics {
namespace detail {
//! SSE4.1 implementation of the \c find_address algorithm
std::size_t find_address_sse41(const volatile void* addr, const volatile void* const* addrs, std::size_t size)
{
if (size < 12u)
return find_address_generic(addr, addrs, size);
const __m128i mm_addr = mm_set1_epiptr((uintptr_t)addr);
std::size_t pos = 0u;
const std::size_t n = (size + 1u) & ~static_cast< std::size_t >(1u);
for (std::size_t m = n & ~static_cast< std::size_t >(15u); pos < m; pos += 16u)
{
__m128i mm1 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos));
__m128i mm2 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 2u));
__m128i mm3 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 4u));
__m128i mm4 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 6u));
__m128i mm5 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 8u));
__m128i mm6 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 10u));
__m128i mm7 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 12u));
__m128i mm8 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 14u));
mm1 = _mm_cmpeq_epi64(mm1, mm_addr);
mm2 = _mm_cmpeq_epi64(mm2, mm_addr);
mm3 = _mm_cmpeq_epi64(mm3, mm_addr);
mm4 = _mm_cmpeq_epi64(mm4, mm_addr);
mm5 = _mm_cmpeq_epi64(mm5, mm_addr);
mm6 = _mm_cmpeq_epi64(mm6, mm_addr);
mm7 = _mm_cmpeq_epi64(mm7, mm_addr);
mm8 = _mm_cmpeq_epi64(mm8, mm_addr);
mm1 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(mm1), _mm_castsi128_ps(mm2), _MM_SHUFFLE(2, 0, 2, 0)));
mm3 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(mm3), _mm_castsi128_ps(mm4), _MM_SHUFFLE(2, 0, 2, 0)));
mm5 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(mm5), _mm_castsi128_ps(mm6), _MM_SHUFFLE(2, 0, 2, 0)));
mm7 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(mm7), _mm_castsi128_ps(mm8), _MM_SHUFFLE(2, 0, 2, 0)));
mm1 = _mm_packs_epi32(mm1, mm3);
mm5 = _mm_packs_epi32(mm5, mm7);
mm1 = _mm_packs_epi16(mm1, mm5);
uint32_t mask = _mm_movemask_epi8(mm1);
if (mask)
{
pos += atomics::detail::count_trailing_zeros(mask);
goto done;
}
}
if ((n - pos) >= 8u)
{
__m128i mm1 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos));
__m128i mm2 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 2u));
__m128i mm3 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 4u));
__m128i mm4 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 6u));
mm1 = _mm_cmpeq_epi64(mm1, mm_addr);
mm2 = _mm_cmpeq_epi64(mm2, mm_addr);
mm3 = _mm_cmpeq_epi64(mm3, mm_addr);
mm4 = _mm_cmpeq_epi64(mm4, mm_addr);
mm1 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(mm1), _mm_castsi128_ps(mm2), _MM_SHUFFLE(2, 0, 2, 0)));
mm3 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(mm3), _mm_castsi128_ps(mm4), _MM_SHUFFLE(2, 0, 2, 0)));
mm1 = _mm_packs_epi32(mm1, mm3);
uint32_t mask = _mm_movemask_epi8(mm1);
if (mask)
{
pos += atomics::detail::count_trailing_zeros(mask) / 2u;
goto done;
}
pos += 8u;
}
if ((n - pos) >= 4u)
{
__m128i mm1 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos));
__m128i mm2 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos + 2u));
mm1 = _mm_cmpeq_epi64(mm1, mm_addr);
mm2 = _mm_cmpeq_epi64(mm2, mm_addr);
mm1 = _mm_castps_si128(_mm_shuffle_ps(_mm_castsi128_ps(mm1), _mm_castsi128_ps(mm2), _MM_SHUFFLE(2, 0, 2, 0)));
uint32_t mask = _mm_movemask_ps(_mm_castsi128_ps(mm1));
if (mask)
{
pos += atomics::detail::count_trailing_zeros(mask);
goto done;
}
pos += 4u;
}
if (pos < n)
{
__m128i mm1 = _mm_load_si128(reinterpret_cast< const __m128i* >(addrs + pos));
mm1 = _mm_cmpeq_epi64(mm1, mm_addr);
uint32_t mask = _mm_movemask_pd(_mm_castsi128_pd(mm1));
if (mask)
{
pos += atomics::detail::count_trailing_zeros(mask);
goto done;
}
pos += 2u;
}
done:
return pos;
}
} // namespace detail
} // namespace atomics
} // namespace boost
#include <boost/atomic/detail/footer.hpp>
#endif // BOOST_ARCH_X86 && defined(BOOST_ATOMIC_DETAIL_SIZEOF_POINTER) && (BOOST_ATOMIC_DETAIL_SIZEOF_POINTER == 8)
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