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The Special Field.

There are many ``specials'' which must be handled by the instruction set. This includes the choice, whether an operation should check its operands to be of the correct type (integer or boolean), the stack switch, the selection of a branch predicate (branch if true or branch if false) and others. Instead of introducing new instructions for each ``special'', they are incorporated into the other instructions. They can be considered as side effects of the base instruction.