Motorola DSP56000 Manual page 518

REP
Restrictions: The REP instruction can repeat any single-word instruction except the
REP instruction itself and any instruction that changes program flow. The following
instructions are not allowed to follow an REP instruction:
Immediately after REP
Also, a REP instruction cannot be the last instruction in a DO loop (at LA). The assem-
bler will generate an error if any of the previous instructions are found immediately fol-
lowing an REP instruction.
Example:
:
REP X0
MAC X1,Y1,A
:
Before Execution
X0
LC
MOTOROLA
INSTRUCTION SET DESCRIPTIONS
Repeat Next Instruction
DO JSSET
Jcc REP
JCLR RTI
JMP RTS
JSET STOP
JScc SWI
JSCLR WAIT
JSR ENDDO
X:(R1)+,X1 Y:(R4)+,Y1
$000100
$0000
INSTRUCTION SET DETAILS
;repeat (X0) times
;X1 ∗ Y1+A
After Execution
X0
$000100
LC
$0000
REP
A, update X1,Y1
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