Defining Macros
5-4
[.mexit]
functions as a goto .endm statement. The .mexit
directive is useful when error testing confirms that
macro expansion will fail.
.endm
terminates the macro definition.
To include comments with your macro definition
that do not appear in the macro expansion, pre-
cede your comments with an exclamation point. To
include comments that do appear in the macro ex-
pansion, use an asterisk or semicolon. For more in-
formation about macro comments, see Section 5.7,
Producing Messages in Macros, on page 5-19.
Example 5–1 shows the definition, call, and expansion of a macro.
Example 5–1. Macro Definition, Call, and Expansion
(a) Mnemonic example
1
*
2
3
*
add3
4
*
5
*
ADDRP = P1 + P2 + P3
6
7
add3
.macro P1, P2, P3, ADDRP
8
9
LD P1, A
10
ADD P2, A
11
ADD P3, A
12
STL A, ADDRP
13
.endm
14
15
16
.global abc, def, ghi, adr
17
18 000000
add3 abc, def, ghi, adr
1
1
000000 1000!
LD abc, A
1
000001 0000!
ADD def, A
1
000002 0000!
ADD ghi, A
1
000003 8000!
STL A, adr
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