AMD-K6-2ESLASH233AMZ datasheet(42/332 Pages) AMD

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Software Environment

Chapter 3

AMD-K6™-2E Processor Data Sheet

22529B/0—January 2000

Preliminary Information

General-Purpose

Registers

The eight 32-bit x86 general-purpose registers are used to hold

integer data or memory pointers used by instructions. Table 2

contains a list of the general-purpose registers and the

functions for which they are used.

To support byte and word operations, EAX, EBX, ECX, and

EDX can also be used as 8-bit and 16-bit registers. The shorter

registers are overlaid on the longer ones. For example, the

name of the 16-bit version of EAX is AX (low 16 bits of EAX)

and the 8-bit names for AX are AH (high order bits) and AL (low

order bits). The same naming convention applies to EBX, ECX,

and EDX.

EDI, ESI, ESP, and EBP can be used as smaller 16-bit registers

called DI, SI, SP, and BP respectively, but these registers do not

have 8-bit versions. Figure 7 shows the EAX register with its

name components, and Table 3 on page 25 lists the doubleword

(32-bit) general-purpose registers and their corresponding word

(16-bit) and byte (8-bit) versions.

Figure 7. EAX Register with 16-Bit and 8-Bit Name Components

Table 2. General-Purpose Registers

EAX

Commonly used as an accumulator

EBX

Commonly used as a pointer

ECX

Commonly used for counting in loop operations

EDX

Commonly used to hold I/O information and to pass parameters

EDI

Commonly used as a destination pointer by the ES segment

ESI

Commonly used as a source pointer by the DS segment

ESP

Used to point to the stack segment

EBP

Used to point to data within the stack segment

EAX

AMD-K6-2E/233AMZ Datasheet(PDF) 42 Page - Advanced Micro Devices

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