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author | Tobias Markmann <tm@ayena.de> | 2014-10-19 20:22:58 (GMT) |
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committer | Tobias Markmann <tm@ayena.de> | 2014-10-20 13:49:33 (GMT) |
commit | 6b22dfcf59474dd016a0355a3102a1dd3692d92c (patch) | |
tree | 2b1fd33be433a91e81fee84fdc2bf1b52575d934 /3rdParty/Boost/src/boost/uuid/detail/uuid_x86.hpp | |
parent | 38b0cb785fea8eae5e48fae56440695fdfd10ee1 (diff) | |
download | swift-6b22dfcf59474dd016a0355a3102a1dd3692d92c.zip swift-6b22dfcf59474dd016a0355a3102a1dd3692d92c.tar.bz2 |
Update Boost in 3rdParty to version 1.56.0.
This updates Boost in our 3rdParty directory to version 1.56.0.
Updated our update.sh script to stop on error.
Changed error reporting in SwiftTools/CrashReporter.cpp to SWIFT_LOG due to
missing include of <iostream> with newer Boost.
Change-Id: I4b35c77de951333979a524097f35f5f83d325edc
Diffstat (limited to '3rdParty/Boost/src/boost/uuid/detail/uuid_x86.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/uuid/detail/uuid_x86.hpp | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/uuid/detail/uuid_x86.hpp b/3rdParty/Boost/src/boost/uuid/detail/uuid_x86.hpp new file mode 100644 index 0000000..1a329b0 --- /dev/null +++ b/3rdParty/Boost/src/boost/uuid/detail/uuid_x86.hpp @@ -0,0 +1,109 @@ +/* + * Copyright Andrey Semashev 2013. + * 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) + */ +/*! + * \file uuid/detail/uuid_x86.hpp + * + * \brief This header contains optimized SSE implementation of \c boost::uuid operations. + */ + +#ifndef BOOST_UUID_DETAIL_UUID_X86_HPP_INCLUDED_ +#define BOOST_UUID_DETAIL_UUID_X86_HPP_INCLUDED_ + +// MSVC does not always have immintrin.h (at least, not up to MSVC 10), so include the appropriate header for each instruction set +#if defined(BOOST_UUID_USE_SSE41) +#include <smmintrin.h> +#elif defined(BOOST_UUID_USE_SSE3) +#include <pmmintrin.h> +#else +#include <emmintrin.h> +#endif + +namespace boost { +namespace uuids { +namespace detail { + +BOOST_FORCEINLINE __m128i load_unaligned_si128(const uint8_t* p) BOOST_NOEXCEPT +{ +#if defined(BOOST_UUID_USE_SSE3) + return _mm_lddqu_si128(reinterpret_cast< const __m128i* >(p)); +#else + return _mm_loadu_si128(reinterpret_cast< const __m128i* >(p)); +#endif +} + +} // namespace detail + +inline bool uuid::is_nil() const BOOST_NOEXCEPT +{ + register __m128i mm = uuids::detail::load_unaligned_si128(data); +#if defined(BOOST_UUID_USE_SSE41) + return _mm_test_all_zeros(mm, mm) != 0; +#else + mm = _mm_cmpeq_epi8(mm, _mm_setzero_si128()); + return _mm_movemask_epi8(mm) == 0xFFFF; +#endif +} + +inline void uuid::swap(uuid& rhs) BOOST_NOEXCEPT +{ + register __m128i mm_this = uuids::detail::load_unaligned_si128(data); + register __m128i mm_rhs = uuids::detail::load_unaligned_si128(rhs.data); + _mm_storeu_si128(reinterpret_cast< __m128i* >(rhs.data), mm_this); + _mm_storeu_si128(reinterpret_cast< __m128i* >(data), mm_rhs); +} + +inline bool operator== (uuid const& lhs, uuid const& rhs) BOOST_NOEXCEPT +{ + register __m128i mm_left = uuids::detail::load_unaligned_si128(lhs.data); + register __m128i mm_right = uuids::detail::load_unaligned_si128(rhs.data); + + register __m128i mm_cmp = _mm_cmpeq_epi32(mm_left, mm_right); +#if defined(BOOST_UUID_USE_SSE41) + return _mm_test_all_ones(mm_cmp); +#else + return _mm_movemask_epi8(mm_cmp) == 0xFFFF; +#endif +} + +inline bool operator< (uuid const& lhs, uuid const& rhs) BOOST_NOEXCEPT +{ + register __m128i mm_left = uuids::detail::load_unaligned_si128(lhs.data); + register __m128i mm_right = uuids::detail::load_unaligned_si128(rhs.data); + + // To emulate lexicographical_compare behavior we have to perform two comparisons - the forward and reverse one. + // Then we know which bytes are equivalent and which ones are different, and for those different the comparison results + // will be opposite. Then we'll be able to find the first differing comparison result (for both forward and reverse ways), + // and depending on which way it is for, this will be the result of the operation. There are a few notes to consider: + // + // 1. Due to little endian byte order the first bytes go into the lower part of the xmm registers, + // so the comparison results in the least significant bits will actually be the most signigicant for the final operation result. + // This means we have to determine which of the comparison results have the least significant bit on, and this is achieved with + // the "(x - 1) ^ x" trick. + // 2. Because there is only signed comparison in SSE/AVX, we have to invert byte comparison results whenever signs of the corresponding + // bytes are different. I.e. in signed comparison it's -1 < 1, but in unsigned it is the opposite (255 > 1). To do that we XOR left and right, + // making the most significant bit of each byte 1 if the signs are different, and later apply this mask with another XOR to the comparison results. + // 3. pcmpgtw compares for "greater" relation, so we swap the arguments to get what we need. + + const __m128i mm_signs_mask = _mm_xor_si128(mm_left, mm_right); + + __m128i mm_cmp = _mm_cmpgt_epi8(mm_right, mm_left), mm_rcmp = _mm_cmpgt_epi8(mm_left, mm_right); + + mm_cmp = _mm_xor_si128(mm_signs_mask, mm_cmp); + mm_rcmp = _mm_xor_si128(mm_signs_mask, mm_rcmp); + + uint32_t cmp = static_cast< uint32_t >(_mm_movemask_epi8(mm_cmp)), rcmp = static_cast< uint32_t >(_mm_movemask_epi8(mm_rcmp)); + + cmp = (cmp - 1u) ^ cmp; + rcmp = (rcmp - 1u) ^ rcmp; + + return static_cast< uint16_t >(cmp) < static_cast< uint16_t >(rcmp); +} + +} // namespace uuids +} // namespace boost + +#endif // BOOST_UUID_DETAIL_UUID_X86_HPP_INCLUDED_ |