13.07.2015 Views

Volume 3: General-Purpose and System Instructions - Stanford ...

Volume 3: General-Purpose and System Instructions - Stanford ...

Volume 3: General-Purpose and System Instructions - Stanford ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

AMD64 Technology 24594 Rev. 3.10 February 2005sticky bitA bit that is set or cleared by hardware <strong>and</strong> that remains inthat state until explicitly changed by software.TOPThe x87 top-of-stack pointer.TPRTask-priority register (CR8).TSSTask-state segment.underflowThe condition in which a floating-point number is smaller inmagnitude than the smallest nonzero, positive or negativenumber that can be represented in the data-type formatbeing used.vector(1) A set of integer or floating-point values, called elements,that are packed into a single oper<strong>and</strong>. Most of the 128-bit<strong>and</strong> 64-bit media instructions use vectors as oper<strong>and</strong>s.Vectors are also called packed or SIMD (single-instructionmultiple-data) oper<strong>and</strong>s.(2) An index into an interrupt descriptor table (IDT), used toaccess exception h<strong>and</strong>lers. Compare exception.virtual-8086 modeA submode of legacy mode.wordTwo bytes, or 16 bits.x86See legacy x86.RegistersIn the following list of registers, the names are used to refereither to a given register or to the contents of that register:AH–DHThe high 8-bit AH, BH, CH, <strong>and</strong> DH registers. CompareAL–DL.xxivPreface

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!