Reference Guide

Chapter 2 25

Program Structure

Registers and Register Mnemonics

This warning can be suppressed with the -w41 command-line option.

Future versions of the Assembler may not always allow an absolute

expression where a register is expected.

The following example demonstrates the correct usage of the .REG

directive:

tblptr .REG %r20

aka_tbl .REG tblptr

Predeﬁned registers are shown in the following tables. All of the

mnemonics begin with the % character, so they do not conﬂict with any

programmer-deﬁned symbols.

Table 2-2 General Registers

%r0 %r8 %r16 %r24

%r1 %r9 %r17 %r25

%r2 %r10 %r18 %r26

%r3 %r11 %r19 %r27

%r4 %r12 %r20 %r28

%r5 %r13 %r21 %r29

%r6 %r14 %r22 %r30

%r7 %r15 %r23 %r31