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Use special MSVC x86 version for aligned_storage as the 32 bit ABI has problems when passing types (even with 8-byte alignment) by value.

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Ion Gaztañaga
2020-11-02 11:21:55 +01:00
parent eb941db76c
commit 3446ceeaaf
1 changed files with 39 additions and 1 deletions
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40
include/boost/move/detail/type_traits.hpp
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@@ -1032,7 +1032,45 @@ typedef union max_align max_align_t;
// aligned_storage
/////////////////////////////
#if !defined(BOOST_NO_ALIGNMENT)
#if defined(_MSC_VER) && defined(_M_IX86)
// Special version for usual alignments on x86 MSVC because it might crash
// when passsing aligned types by value even for 8 byte alignment.
template<std::size_t Align>
struct aligned_struct;
template <> struct aligned_struct<1> { char data; };
template <> struct aligned_struct<2> { short data; };
template <> struct aligned_struct<4> { int data; };
template <> struct aligned_struct<8> { double data; };
#define BOOST_MOVE_ALIGNED_STRUCT(x) \
template <> struct aligned_struct<x> { \
__declspec(align(x)) char data; \
}
BOOST_MOVE_ALIGNED_STRUCT(16);
BOOST_MOVE_ALIGNED_STRUCT(32);
BOOST_MOVE_ALIGNED_STRUCT(64);
BOOST_MOVE_ALIGNED_STRUCT(128);
BOOST_MOVE_ALIGNED_STRUCT(512);
BOOST_MOVE_ALIGNED_STRUCT(1024);
BOOST_MOVE_ALIGNED_STRUCT(2048);
BOOST_MOVE_ALIGNED_STRUCT(4096);
template<std::size_t Len, std::size_t Align>
union aligned_union
{
aligned_struct<Align> aligner;
unsigned char data[Len];
};
template<std::size_t Len, std::size_t Align>
struct aligned_storage_impl
{
typedef aligned_union<Len, Align> type;
};
#elif !defined(BOOST_NO_ALIGNMENT)
template<std::size_t Len, std::size_t Align>
struct aligned_struct;