Velocity Engine is Apple’s name for the AltiVec vector processor in the PowerPC G4 microprocessor. Apple provides support for developers who are starting to use the Velocity Engine in their applications. Documentation, development tools, and sample code are now available on the World Wide Web, at
http://developer.apple.com/hardwaredrivers/ve/index.html
and
http://developer.apple.com/documentation/Performance/Conceptual/vDSP/vDSP_Library.pdf
AltiVec Technology Programming Environments Manual (AltiVec PEM) is a reference guide for programmers. It contains a description for each instruction and information to help in understanding how the instruction works. You can obtain a copy of the AltiVec PEM through the Motorola documentation site on the World Wide Web, at
http://e-www.motorola.com/webapp/sps/site/overview.jsp?nodeId=03M943030450467M0ymK5Nf2