Forced Substitution - Texas Instruments TMS320C54x User Manual

5.3.5

Forced Substitution

Example 5–7. Using the Forced Substitution Operator
In some cases, substitution symbols are not recognizable to the assembler.
The forced substitution operator, which is a set of colons, enables you to force
the substitution of a symbol's character string. Simply enclose a symbol in
colons to force the substitution. Do not include any spaces between the colons
and the symbol.
The syntax for the forced substitution operator is
:symbol:
The assembler expands substitution symbols enclosed in colons before it
expands other substitution symbols.
You can use the forced substitution operator only inside macros, and you
cannot nest a forced substitution operator within another forced substitution
operator.
Example 5–7 shows how the forced substitution operator is used.
force .macro x
.asg
.loop 8
AUX:x: .set
.eval x+1,x
.endloop
.endm
The force macro would generate the following source code:
AUX0 .set
AUX1 .set
.
.
.
AUX7 .set
Macro Parameters/Substitution Symbols
0,x
x
0
1
7
Macro Language 5-11