Loop unrolling

[FIRTH at TL-20B.ARPA]

The loop

    L1:
	movb (r2)+,(r1)+
	bneq L1

is indeed improved by unrolling:

    L1:
	movb (r2)+,(r1)+
	beql L2
	movb (r2)+,(r1)+
	bneq L1
    L2:

Each unrolling replaces a conditional branch taken by a conditional
branch NOT taken, which is a gain in speed

Robert Firth
Tartan Labs Inc
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