Optimizes code generation to favor the Pentium Pro (P6) processor. Code generated with this option will still run on earlier processors, but less efficiently.
The Pentium Pro microprocessor architecture allows certain code generation strategies that can substantially improve efficiency. However, code created using these strategies does not perform as well on 80386- and 80486-based or Pentium computers. Therefore, you should only use this option if all or most of the machines your program will run on use the Pentium Pro.