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c++ Programming Glossary: vectorizeWhy is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array such as in this example Update GCC 4.6.1 with O3 or ftree vectorize on x64 is able to generate a conditional move. So there is no.. the Intel Compiler the branchless code it just out right vectorizes it... and is just as fast as with the branch with the loop..
Structure of arrays and array of structures - performance difference http://stackoverflow.com/questions/11616941/structure-of-arrays-and-array-of-structures-performance-difference i .update In order to speed up things and possibly autovectorize the loop I converted AoS to structure of arrays. Structure of.. v i u i Many other equations When the loop fails to autovectorize i am getting a very bad performance for structure of arrays... I am using gcc 4.5.2. Compiler options are o3 msse4 ftree vectorize. I did another experiment in SoA. Instead of dynamically allocating..
http://stackoverflow.com/questions/12430339/c-large-number-arithmetic can change the structure of digits that your compiler can vectorize the code and multiply 16 to 32 digits at once unrolls quite..
How to vectorize a distance calculation using SSE2 http://stackoverflow.com/questions/17000465/how-to-vectorize-a-distance-calculation-using-sse2 to vectorize a distance calculation using SSE2 A and B are vectors or length.. O2 Oi Ot Oy . My understanding is that VS2012 should auto vectorize that loop using SSE2 . However if I insert #pragma loop no_vector.. get a noticable slow down so I guess the loop is not being vectorized. The compiler confirms that with this message info C5002 loop..
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