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Implement aligned_struct with __declspec(align(x)) for x = 8 as MSVC will not align the stack if a built-in type is used (like double).

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Ion Gaztañaga
2024-04-16 14:42:42 +02:00
parent d6b970285b
commit d0631eec74
1 changed files with 9 additions and 1 deletions
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10
include/boost/move/detail/type_traits.hpp
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@ -1197,12 +1197,20 @@ struct aligned_struct;
template <> struct aligned_struct<1> { char data; }; template <> struct aligned_struct<1> { char data; };
template <> struct aligned_struct<2> { short data; }; template <> struct aligned_struct<2> { short data; };
template <> struct aligned_struct<4> { int data; }; template <> struct aligned_struct<4> { int data; };
template <> struct aligned_struct<8> { double data; }; //8 byte alignment does not propely work in x86 if attribute is not used.
//If a user declares a variable with 8 byte alignment, such as a double
//the compiler will not realign the stack.
//
//If _declspec(align) is used MSVC will realign the stack.
//
//Disabled specialization
//template <> struct aligned_struct<8> { double data; };
#define BOOST_MOVE_ALIGNED_STRUCT(x) \ #define BOOST_MOVE_ALIGNED_STRUCT(x) \
template <> struct aligned_struct<x> { \ template <> struct aligned_struct<x> { \
__declspec(align(x)) char data; \ __declspec(align(x)) char data; \
} }
BOOST_MOVE_ALIGNED_STRUCT(8);
BOOST_MOVE_ALIGNED_STRUCT(16); BOOST_MOVE_ALIGNED_STRUCT(16);
BOOST_MOVE_ALIGNED_STRUCT(32); BOOST_MOVE_ALIGNED_STRUCT(32);
BOOST_MOVE_ALIGNED_STRUCT(64); BOOST_MOVE_ALIGNED_STRUCT(64);