AMD AMD-K6-2/400 User Guide - Page 51
Integer Data Types, Software Environment
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23542A/0-September 2000 Preliminary Information AMD-K6™-2E+ Embedded 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 29