AMD AMD-K6-2/500AFX Data Sheet - Page 43
Integer Data Types, Software Environment, AMD-K6, 2 Processor Data Sheet
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21850J/0-February 2000 Preliminary Information AMD-K6®-2 Processor Data Sheet Integer Data Types Byte Integer Table 3. General-Purpose Register Doubleword, Word, and Byte Names 32-Bit Name (Doubleword) EAX EBX ECX EDX EDI ESI ESP EBP 16-Bit Name (Word) AX BX CX DX DI SI SP BP 8-Bit Name 8-Bit Name (High-order Bits) (Low-order Bits) AH AL BH BL CH CL DH DL - - - - - - - - Four types of data are used in general-purpose registers-byte, word, doubleword, and quadword integers. Figure 8 shows the format of the integer data registers. 7 0 Precision - 8 Bits Word Integer 15 0 Precision - 16 Bits Doubleword Integer 31 Precision - 32 Bits Quadword Integer 63 Figure 8. Integer Data Registers Chapter 3 Precision - 64 Bits Software Environment 0 0 23
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Chapter 3
Software Environment
23
21850J/0—February 2000
AMD-K6
®
-2 Processor Data Sheet
Preliminary Information
Integer Data Types
Four types of data are used in general-purpose registers—byte,
word, doubleword, and quadword integers. Figure 8 shows the
format of the integer data registers.
Figure 8.
Integer Data Registers
Table 3.
General-Purpose Register Doubleword, Word, and Byte Names
32-Bit Name
(Doubleword)
16-Bit Name
(Word)
8-Bit Name
(High-order Bits)
8-Bit Name
(Low-order Bits)
EAX
AX
AH
AL
EBX
BX
BH
BL
ECX
CX
CH
CL
EDX
DX
DH
DL
EDI
DI
–
–
ESI
SI
–
–
ESP
SP
–
–
EBP
BP
–
–
15
0
31
0
Precision — 32 Bits
Precision — 16 Bits
Word Integer
Doubleword Integer
7
0
Precision —
8 Bits
Byte Integer
63
0
Precision — 64 Bits
Quadword Integer