darktable and AMD performance in benchmarks

[heckflosse (Ingo Weyrich)]

@paolod

If a type or one of its members has attribute((aligned(32))) or 64 to encourage vectorization, then it cannot be safely allocated on the heap with malloc, as malloc only ensures 16 byte alignment. There is no compile time warning for this error, only an intermittent crash at runtime.

Giving the compiler wrong alignment hints is a coding bug IMHO…