Difference between revisions of "Assembler:Commands:DEC"
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(Created page with ''''command''' dec ''operand'' Decreases the operand by one. Subtracts 1 from the operand, while preserving the state of the '''CF''' flag. The operand can be a register or a m…') |
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Revision as of 19:34, 13 March 2017
command dec operand
Decreases the operand by one.
Subtracts 1 from the operand, while preserving the state of the CF flag. The operand can be a register or a memory location. This instruction allows a loop counter to be updated without disturbing the CF flag. (To perform a decrement operation that updates the CF flag, use a SUB instruction with an immediate operand of 1.)
The CF flag is not affected. The OF, SF, ZF, AF,
and PF flags are set according to the result.
operand = operand - 1
Command Parameters
| Parameter | Description |
|---|---|
| operand | The destination operand |
Examples
dec al
dec ax
dec eax
dec rax
dec [00123ABC]
dec [rax]
dec [SomeSymbol]
