Texas Instruments TMS320C54x, User Manual

Page: 196 / 469

Using Conditional Assembly in Macros
5-16
Example 5–10. The .loop/.break/.endloop Directives
.asg 1,x
.loop
.break (x == 10) ; if x == 10, quit loop/break with
; expression
.eval x+1,x
.endloop
Example 5–11. Nested Conditional Assembly Directives
.asg 1,x
.loop
.if (x == 10) ; if x == 10 quit loop
.break ; force break
.endif
.eval x+1,x
.endloop
Example 5–12. Built-In Substitution Symbol Functions Used in a Conditional Assembly
Code Block
.ref OPZ
.fcnolist
*
*Double Add or Subtract
*
DBL
.macro ABC, ADDR, src ; add or subtract double
.if $symcmp(ABC,”+”) == 0
dadd
ADDR, src ; add double
.elseif $symcmp(ABC,”–”) == 0
dsub
ADDR, src ; subtract double
.else
.emsg
”Incorrect Operator Parameter”
.endif
.endm
*Macro Call
DBL –, OPZ, A
For more information about conditional assembly directives, see Section 4.8,
Conditional Assembly Directives, on page 4-20.