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COMPONENT INTRODUCTION
1.5.
COMPATIBILITY NOTE
In this document, some register bits are Intel Reserved. When reserved bits are documented,
treat them as fully undefined. This is essential for software compatibility with future processors.
Follow the guidelines below:
1. Do not depend on the states of any undefined bits when testing the values of defined
register bits. Mask them out when testing.
2. Do not depend on the states of any undefined bits when storing them to memory or another
register.
3. Do not depend on the ability to retain information written into any undefined bits.
4. When loading registers, always load the undefined bits as zeros.
1-8
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