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Use __BIGGEST_ALIGNMENT__ only if its smaller than sizeof\(T\)

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This commit is contained in:
Jeffrey Walton 2016-09-13 22:28:03 -04:00
parent db768200ab
commit 5790163abc
1 changed files with 7 additions and 3 deletions
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10
misc.h
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@ -875,7 +875,8 @@ inline T1 RoundUpToMultipleOf(const T1 &n, const T2 &m)
//! \details Internally the function calls C++11's <tt>alignof</tt> if available. If not available,
//! then the function uses compiler specific extensions such as <tt>__alignof</tt> and
//! <tt>_alignof_</tt>. If an extension is not available, then the function uses
//! <tt>__BIGGEST_ALIGNMENT__</tt>. <tt>sizeof(T)</tt> is used if the others are not available.
//! <tt>__BIGGEST_ALIGNMENT__</tt> if <tt>__BIGGEST_ALIGNMENT__</tt> is smaller than <tt>sizeof(T)</tt>.
//! <tt>sizeof(T)</tt> is used if all others are not available.
//! In <em>all</em> cases, if <tt>CRYPTOPP_ALLOW_UNALIGNED_DATA_ACCESS</tt> is defined, then the
//! function returns 1.
template <class T>
@ -893,11 +894,14 @@ inline unsigned int GetAlignmentOf(T *dummy=NULL) // VC60 workaround
return __alignof(T);
#elif defined(__GNUC__)
return __alignof__(T);
#elif __BIGGEST_ALIGNMENT__
return __BIGGEST_ALIGNMENT__;
#elif CRYPTOPP_BOOL_SLOW_WORD64
return UnsignedMin(4U, sizeof(T));
#else
# if __BIGGEST_ALIGNMENT__
if (__BIGGEST_ALIGNMENT__ < sizeof(T))
return __BIGGEST_ALIGNMENT__;
else
# endif
return sizeof(T);
#endif
}