The vectorizer speeds up your code by automatically generating Single-Instruction Multiple-Data (SIMD) code for qualifying loops. These SIMD instructions can be found on processors employing Intel® MMX technology, Streaming SIMD Extensions (SSE), and the Pentium® 4 processor's Streaming SIMD Extensions 2 (SSE2) and Streaming SIMD Extensions 3 (SSE3).
The vectorizer can also use the Short Vector Math library.
For a detailed discussion of MMX technology, SSE and SSE2, see the following pages at the Intel® Software College:
The following book, available from Intel Press, includes information on vectorization, including information on SSE3:
In order to take advantage of the vectorizer, a loop must meet the following criteria:
To enable the vectorizer, use the following options (shown previously):
For detailed information on the vectorizer, see the tutorial Optimizing Performance Using Intel's Vectorizing Compilers at the Intel® Software College.