The following sources might be useful in helping you understand basic vectorization terminology and technology:
High Performance Computing (2nd edition), Kevin Dowd (O'Reilly and Associates, 1998), ISBN 156592312X
Intel Architecture Optimization Manual, Intel Corporation, order number, 730795.
Dependence Analysis, Utpal Banerjee (A Book Series on Loop Transformations for Restructuring Compilers). Kluwer Academic Publishers. 1997.
The Structure of Computers and Computation: Volume I, David J. Kuck. John Wiley and Sons, New York, 1978.
Loop Transformations for Restructuring Compilers: The Foundations, Utpal Banerjee (A Book Series on Loop Transformations for Restructuring Compilers). Kluwer Academic Publishers. 1993.
Loop Parallelization, Utpal Banerjee (A Book Series on Loop Transformations for Restructuring Compilers). Kluwer Academic Publishers. 1994.
High Performance Compilers for Parallel Computers, Michael J. Wolfe. Addison-Wesley, Redwood City. 1996.
Supercompilers for Parallel and Vector Computers, H. Zima. ACM Press, New York, 1990.