AMD AMD-K6-2/500AFX Data Sheet - Page 49
MMX™/3DNow!™ Registers, MMX™ Data Types, ™ Technology Manual - processor multimedia technology
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21850J/0-February 2000 Preliminary Information AMD-K6®-2 Processor Data Sheet MMX™/3DNow!™ Registers T h e A M D -K 6 -2 p r o c e s s o r i m p l e m e n t s e i g h t 6 4 -b i t MMX/3DNow! registers for use by multimedia software. These registers are mapped on the floating-point register stack. The MMX and 3DNow! instructions refer to these registers as mm0 to mm7. Figure 17 shows the format of these registers. For more information, see the AMD-K6® Processor Multimedia Technology Manual, order# 20726 and the 3DNow!™ Technology Manual, order# 21928. 63 0 mm0 mm1 mm2 mm3 mm4 mm5 mm6 mm7 Figure 17. MMX™/3DNow!™ Registers MMX™ Data Types For the MMX instructions, the MMX registers use three types of data-packed eight-byte integer, packed quadword integer, and packed dual doubleword integer. Figure 18 on page 30 shows the format of these data types. Chapter 3 Software Environment 29
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