The BCT instruction is intended for use at the end of a loop. That is, before starting the loop the number of iterations over the loop is set up in the count register. At the end of each pass over the loop the count is decremented and the loop is repeated until the count drops to zero.
YREGS * Define register names ... SETUP LA R2,12 * Repeat 12 times LOOP EQU * * Start of loop ... * Content of the loop goes here BCT R2,LOOP * Repeat until count drops to 0 ...
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