3.11. 3.11 The INC and DEC Instructions
As the example in the last section indicates, indeed, as several examples up to this point have indicated, adding or subtracting one from a register or memory location is a very common operation. In fact, this operation is so common that Intel's engineers included a pair of instructions to perform these specific operations: the inc (increment) and dec (decrement) instructions.
The inc and dec instructions use the following syntax:
inc( mem/reg ); dec( mem/reg );
The single operand can be any legal 8-bit, 16-bit, or 32-bit register or memory operand. The inc instruction will add one to the specified operand; the dec instruction will subtract one from the specified operand.
These two instructions are slightly ...
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