5.8.8 Rept Directive
The .rept count directive repeat the
sequence of lines between the .rept directive and the
next .endr directive,
count times. Specifying
count as zero is allowed, but no output is generated.
Negative values for count are not permitted and if
encountered will be treated as if they were zero.
For example, assembling:
.rept 3
.long 0
.endr.long 0
.long 0
.long 0