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Fix unaligned loads and stores

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Peter Dimov
2017-12-23 18:40:09 +02:00
parent 62802fee96
commit e93f6a2270
1 changed files with 11 additions and 2 deletions
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13
include/boost/endian/buffers.hpp
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@@ -47,6 +47,7 @@
#include <boost/core/scoped_enum.hpp>
#include <iosfwd>
#include <climits>
#include <cstring>
# if CHAR_BIT != 8
# error Platforms with CHAR_BIT != 8 are not supported
@@ -295,7 +296,12 @@ namespace endian
// case since sizeof(T) and n_bytes are known at compile
// time.
{
return *reinterpret_cast<T const *>(bytes);
// Avoids -fsanitize=undefined violations due to unaligned loads
// All major x86 compilers optimize a short-sized memcpy into a single instruction
T t;
std::memcpy( &t, bytes, sizeof(T) );
return t;
}
# endif
return unrolled_byte_loops<T, n_bytes>::load_little
@@ -321,7 +327,10 @@ namespace endian
// case since sizeof(T) and n_bytes are known at compile
// time.
{
*reinterpret_cast<T *>(bytes) = value;
// Avoids -fsanitize=undefined violations due to unaligned stores
// All major x86 compilers optimize a short-sized memcpy into a single instruction
std::memcpy( bytes, &value, sizeof(T) );
return;
}
# endif