Using the conditional branch (BR) instruction, a subroutine was called. As is customary, the subroutine finishes with a RET instruction.
The software will either crash or provide unexpected effects when control is returned to an unknown instruction. The fundamental selection construct is the first control structure we'll look at. It chooses one of two (or perhaps more) blocks of code to run based on a condition, which is why it is named selection. In its most general form, the condition could be calculated in a number of different ways, although it is typically the outcome of a comparison operation or the result of a Boolean expression evaluation. Programmers can alter the address of the next instruction to be executed using branch instructions.
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