Assembler:Commands:DEC

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command dec operand

Decreases the operand by one.


The CF flag is not affected. The OF, SF, ZF, AF, and PF flags are set according to the result.

operand = operand - 1


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.)

c9x.me/x86/html/file_module_x86_id_71.html


Contents

[edit] Command Parameters

Parameter Description
operand The destination operand


[edit] Examples

dec al
dec ax
dec eax
dec rax
dec [00123ABC]
dec [rax]
dec [SomeSymbol]

[edit] See also

[edit] External links

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